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PACIFIC GASAND ELECTRIC COMPANY Technical Specifications: Appendix N2

PURCHASEANDSALE AGREEMENT Combined Cycle

1. OVERALL FACILITY CONFIGURATION .................................................................12

1.1. Major Components........................................................................................................................12

1.2. Balance of Plant Support Systems.................................................................................................12

2. SITE CONDITIONS...........................................................................................................14

2.1. Site Elevation and Barometric Pressure.........................................................................................14

2.2. Temperatures.................................................................................................................................14

2.3. Precipitation, Wind and Earthquake................................................................................. .............14

3. CODES AND STANDARDS..............................................................................................15

3.1. State and Local Building Codes, Standards and Ordinances..........................................................15

3.2. U.S. Government Codes, Ordinances, and Standards....................................................................15

3.3. American Society of Mechanical Engineers..................................................................................15

3.4. American National Standards Institute........................................................................................ ..16

3.5. Industry Standards.........................................................................................................................17

3.6. Electric Utility Requirements....................................................................................................... .19

4. TECHNICAL REQUIREMENTS ....................................................................................19

4.1. System Descriptions............................................................................................................ ..........20

4.2. Plant Identification System............................................................................................................21

4.3. Supplier Factory Tests...................................................................................................................21

4.4. Testing...........................................................................................................................................22

4.5. Welding................................................................................................................................... ......24

4.6. Lubrication................................................................................................................................ ....24

4.7. Consumables..................................................................................................................................25

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5. OPERATIONAL REQUIREMENTS...............................................................................25

6. MAJOR MECHANICAL EQUIPMENT AND SYSTEMS............................................26

6.1. Combustion Turbine......................................................................................................................26

6.1.1. Turbine Supervisory Instrumentation......................................................................................27

6.1.2. Inlet Air Filter.........................................................................................................................27

6.1.3. Acoustic Enclosures ...............................................................................................................28

6.1.4. Water Wash System................................................................................................................28

6.1.5. Combustion Turbine Exhaust Duct.........................................................................................29

6.2. Heat Recovery Steam Generator....................................................................................................29

6.2.1. HRSG Casing..........................................................................................................................34

6.2.2. HRSG Burner System Valves.................................................................................................34

6.2.3. Duct Burners...........................................................................................................................34

6.2.4. Feedwater System...................................................................................................................35

6.2.5. Temperature Monitoring.........................................................................................................36

6.2.6. Blowdown Tanks....................................................................................................................36

6.2.7. Exhaust Stack..........................................................................................................................36

6.3. Steam Turbine and Associated Components..................................................................................36

6.3.1. Lube and Control Oil Systems........................................................................................... .....38

6.3.2. Gland Steam Sealing System..................................................................................................39

6.3.3. Turning Gear...........................................................................................................................39

6.3.4. Piping......................................................................................................................................39

6.3.5. Steam Strainers.......................................................................................................................40

6.3.6. Drains.......................................................................................................................... ...........40

6.3.7. Insulation and Lagging.......................................................................................................... .40

6.3.8. Chemical Cleaning..................................................................................................................40

6.3.9. Guards.....................................................................................................................................40

6.3.10. Main Steam System........................................................................................................ ......40

6.3.11. Exhaust Hood Sprays ...........................................................................................................41

6.3.12. Instrumentation and Control.............................................................................................. ...41

6.4. Heat Rejection Systems.................................................................................................................42

6.4.1. Condenser...............................................................................................................................42

6.4.2. Steam Turbine Bypass ........................................................................................................ ...43



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6.4.3. Condensate System.................................................................................................................43

6.4.4. Circulating Water System...................................................................................................... .44

6.4.5. Auxiliary Cooling Water System ........................................................................................ ...45

6.4.6. Closed Cooling Water System................................................................................................46

6.4.7. Mechanical Draft Cooling Tower (as applicable)...................................................................46

6.4.8. Air-Cooled Condenser (if applicable).....................................................................................47

6.4.9. Pumps............................................................................................................................... ......51

6.5. Piping ................................................................................................................................ ...........54

6.5.1. Piping Materials......................................................................................................................56

6.5.2. Pipe Velocities........................................................................................................................58

6.5.3. Pipe Hangers and Supports.................................................................................................... .59

6.6. Valves............................................................................................................................................59

6.6.1. Drain and Vent Valves and Traps...........................................................................................60

6.6.2. Low-Pressure Water Valves....................................................................................................61

6.6.3. Instrument Air Valves.............................................................................................................61

6.6.4. Non-Return Valves................................................................................................................ .61

6.6.5. Motor-Actuated Valves...........................................................................................................61

6.6.6. Control Valves........................................................................................................................62

6.6.7. Safety and Relief Valves.........................................................................................................64

6.6.8. Instrument Root Valves..........................................................................................................65

6.6.9. Float-Operated Valves........................................................................................................ ....65

6.6.10. High-Pressure Valves............................................................................................................65

6.7. Insulation and Freeze Protection....................................................................................................66

6.8. Tanks.............................................................................................................................................66

6.9. Heat Exchangers............................................................................................................................67

6.10. Pressure Vessels....................................................................................................................... ...67

6.11. Fuel Gas Supply System..............................................................................................................67

6.12. Water Source and Treatment System...........................................................................................69

6.13. Demineralized Water (Condensate Makeup)...............................................................................70

6.14. Wastewater Treatment and Discharge..........................................................................................71



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6.15. Sump Pumps................................................................................................................................72

6.16. Potable Water........................................................................................................................... ...72

6.17. Fire Protection System ................................................................................................................72

6.17.1. General..................................................................................................................................72

6.17.2. Sellers Responsibility.................................................................................................. ........73

6.17.3. Fire Protection Master Plan and Design Basis......................................................................74

6.17.4. Codes, Standards and Recommendations..............................................................................75

6.17.5. Other Codes and Standards...................................................................................................77

6.17.6. Materials, Equipment and System Components Listings and Approvals..............................78

6.17.7. Fire Protection Water Supply and Water Storage..................................................................78

6.17.8. Fire Pumps............................................................................................................................79

6.17.9. Underground Fire Protection Water Main System and Hydrants..........................................80

6.17.10. Fire Hydrants................................................................................................................. .....81

6.17.11. Fire Protection and Detection System.................................................................................82

6.18. Fire Detection System..................................................................................................................86

6.19. Compressed Air System...............................................................................................................89

6.20. Cranes, Hoists, and Trolleys........................................................................................................90

6.21. Heating Ventilating and Air Conditioning ..................................................................................91

6.21.1. System Function............................................................................................................... ....91

6.21.2. Buildings and Enclosures......................................................................................................91

6.21.3. Air Conditioning System................................................................................................. .....92

6.21.4. Battery Room Exhaust System..............................................................................................92

6.21.5. Design Parameters............................................................................................................ ....93

6.21.6. Standards........................................................................................................................ ......93

6.22. Chemical Injection Skids, Chemical Storage, and Bottled Gas Storage.......................................94

7. MAJOR ELECTRICAL EQUIPMENT AND SYSTEMS..............................................95

7.1. Frequency and Voltage Limits.......................................................................................................95

7.1.1. Frequency............................................................................................................................ ...95

7.1.2. Voltage......................................................................................................................... ..........96

7.2. Auxiliary Equipment.....................................................................................................................96



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7.3. Synchronous Generator........................................................................................................ .........96

7.3.1. Construction of the Generator.................................................................................................97

7.3.2. Accessories......................................................................................................................... ...97

7.3.3. Generator Neutral Grounding.................................................................................................98

7.3.4. Excitation Systems..................................................................................................................98

7.4. Isolated-Phase Bus Ducts, Non-Segregated Phase Bus Ducts, and Generator Circuit Breakers....99

7.5. Plant Electrical Auxiliary Systems...............................................................................................100

7.6. Electrical System Design and Equipment Requirements.............................................................101

7.7. Automatic Generation Control Terminal.....................................................................................102

7.8. Generator Bus..............................................................................................................................104

7.9. Neutral Grounding Equipment.....................................................................................................104

7.10. GSU Transformer Bank.............................................................................................................104

7.10.1. GSU Cooling System..........................................................................................................105

7.10.2. Generator Breakers...................................................................................................... .......106

7.11. Unit Auxiliary Transformer.......................................................................................................106

7.12. System Protection......................................................................................................................106

7.12.1. Generator Protective Relaying............................................................................................108

7.12.2. Generator Bus and Transformer Protective Relaying..........................................................109

7.12.3. Main Power Transformer Protective Relaying....................................................................109

7.12.4. Auxiliary System Relaying............................................................................................. ....110

7.12.5. Major Interlocks..................................................................................................................110

7.12.6. Lockout Relay Actions........................................................................................................110

7.12.7. Protective Relays........................................................................................................ ........111

7.13. Medium-Voltage Bus Duct .......................................................................................................111

7.13.1. Non-Segregated Phase Bus Duct/Cable Bus (as required)..................................................111

7.13.2. Bus Ratings.........................................................................................................................111

7.13.3. Cable Bus Duct ................................................................................................................. .111

7.13.4. Bus Ratings.........................................................................................................................111

7.13.5. Conductors..........................................................................................................................111

7.13.6. Medium-Voltage System................................................................................................ ....112



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7.14. Low-Voltage System............................................................................................................ .....113

7.14.1. System Configuration.................................................................................................. .......113

7.14.2. Transformers.......................................................................................................................113

7.15. Switchgear.................................................................................................................................114

7.16. Motor Control Centers...............................................................................................................114

7.16.1. Operational Requirements...................................................................................................115

7.16.2. Protection............................................................................................................................115

7.17. Alternate Power Source...................................................................................................... .......116

7.18. Essential Service AC System.....................................................................................................116

7.18.1. Uninterruptible Power Supply.............................................................................................116

7.18.2. Rectifier..............................................................................................................................116

7.18.3. Inverter................................................................................................................................116

7.18.4. Static Transfer Switch.........................................................................................................117

7.18.5. Essential Service 120V AC Distribution Panelboard..........................................................117

7.19. Essential Service DC System.....................................................................................................117

7.19.1. Batteries..............................................................................................................................118

7.19.2. Battery Accessories.............................................................................................................118

7.19.3. Battery Chargers.................................................................................................................118

7.20. Motors................................................................................................................................ .......119

7.20.1. 4,000-Volt Motors...............................................................................................................119

7.20.2. Low-Voltage Motors...........................................................................................................121

7.20.3. Standby Power Generator ...................................................................................... ............121

7.21. Miscellaneous............................................................................................................................122

7.21.1. Communications Section....................................................................................................122

7.21.2. Security...............................................................................................................................123

7.21.3. Panelboards.........................................................................................................................124

7.21.4. Grounding and Lightning Protection System......................................................................124

7.21.5. Cathodic Protection System ...............................................................................................125

7.21.6. Lighting Systems........................................................................................................... .....125

7.21.7. Cable and Raceway Systems...............................................................................................126

7.22. General Wiring Requirements............................................................................................. ......130



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7.23. Protective Relay Panel Functional Requirements......................................................................131

7.24. Workstations..............................................................................................................................131

7.25. Testing and Checking of Electrical Equipment..........................................................................131

7.26. Embedded Work........................................................................................................................131

7.27. Freeze Protection...................................................................................................................... .131

7.28. Switchyard.................................................................................................................................132

7.28.1. Circuit Breakers..................................................................................................................132

7.28.2. Disconnect Switches...........................................................................................................133

7.28.3. System Protection...............................................................................................................133

7.28.4. Control................................................................................................................................133

7.28.5. Power Metering...................................................................................................................133

7.28.6. Non-Revenue Metering.......................................................................................................134

7.28.7. Steel Structures...................................................................................................................136

7.28.8. Miscellaneous............................................................................................................. ........136

7.28.9. Switchyard Grounding and Lightning Protection................................................................136

7.28.10. Stability Study...................................................................................................................137

8. INSTRUMENTATION AND CONTROL REQUIREMENTS....................................137

8.1. Distributed Control System..........................................................................................................139

8.1.1. Performance Requirements...................................................................................................140

8.1.2. Functional Requirements......................................................................................................140

8.1.3. Console Design.....................................................................................................................140

8.1.4. Hardware Requirements........................................................................................................141

8.1.5. DCS Partitioning...................................................................................................................141

8.1.6. Power....................................................................................................................................141

8.1.7. System Failure Protection................................................................................................ .....141

8.1.8. DCS Communication Network.............................................................................................141

8.1.9. Printers..................................................................................................................................142

8.1.10. Computing Hardware and System I/O.............................................................................. ..142

8.1.11. System Cabinets..................................................................................................................142

8.1.12. Electrical Design Criteria....................................................................................................143

8.2. Software Requirements................................................................................................................143



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8.2.1. Data Acquisition...................................................................................................................143

8.2.2. DCS Interfaces......................................................................................................................145

8.3. Testing.........................................................................................................................................148

8.3.1. Tools.....................................................................................................................................149

8.3.2. Installation and Operating Instructions.................................................................................149

8.4. Continuous Emissions Monitoring System..................................................................................149

8.4.1. Analyzer Subsystem..............................................................................................................150

8.4.2. Sample Transport System................................................................................................... ..150

8.4.3. Stack Gas Monitoring Equipment.........................................................................................151

8.4.4. CEMS Data Logger ..............................................................................................................151

8.4.5. CEMS Enclosure...................................................................................................................151

8.4.6. Documentation......................................................................................................................151

8.4.7. Shipping................................................................................................................................151

8.4.8. Factory Checkout..................................................................................................................151

8.5. Data Acquisition System .................................................................................................... ........152

8.5.1. Software................................................................................................................................152

8.5.2. Data Communications System..............................................................................................153

8.5.3. Reporting and Recordkeeping Requirements........................................................................153

8.5.4. Quality Assurance and Quality Control Data........................................................................153

8.6. Balance-of-Plant Instrumentation Installation Criteria and Installation Details...........................154

8.6.1. Scope of Specification.................................................................................................. ........154

8.6.2. Instrumentation Electrical Requirements..............................................................................157

8.6.3. Pressure Instruments.............................................................................................................157

8.6.4. Temperature Instruments......................................................................................................159

8.6.5. Level Instruments.................................................................................................. ...............160

8.6.6. Level Gauges........................................................................................................................162

8.6.7. Flow Elements Flow Nozzles and Venturis.......................................................................162

8.6.8. Flow Elements Orifice Plates ............................................................................................163

8.6.9. Annunciators, Alarm Switches, and Electrical Devices .......................................................164

8.6.10. Process Analyzers and Analyzer Systems...........................................................................165

8.6.11. Pressure and Temperature Switches....................................................................................167

8.7. Instrument Air and Service Air Systems......................................................................................167



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8.8. Field-Mounted Instruments..........................................................................................................167

8.8.1. Instrumentation - General Design.........................................................................................168

8.8.2. Instrument Cabinets and Local Control Panels.....................................................................169

8.8.3. Instrument Tubing and Piping...............................................................................................170

8.8.4. Air Piping, Fittings, and Pneumatic Devices.........................................................................172

8.9. Steam/Water Sampling and Analysis...........................................................................................173

8.10. Vibration Monitoring System....................................................................................................173

8.11. Plant Siren System.....................................................................................................................173

8.12. Instrument Calibration...............................................................................................................173

8.13. I&C Maintenance Area Requirements.......................................................................................174

9. CIVIL AND STRUCTURAL WORKS...........................................................................174

9.1. Design Criteria.............................................................................................................................174

9.1.1. Dead Loads.......................................................................................................................... .174

9.1.2. Live Loads........................................................................................................................ ....174

9.2. Site Preparation............................................................................................................................177

9.3. Geotechnical Investigations.........................................................................................................177

9.4. Surveying.....................................................................................................................................178

9.5. Site Development and Earthwork......................................................................................... .......178

9.6. Temporary Construction Facilities...............................................................................................178

9.7. Facility Grading...........................................................................................................................179

9.7.1. Earthwork......................................................................................................................... ....180

9.7.2. Clearing and Grubbing..........................................................................................................181

9.7.3. Stripping...............................................................................................................................181

9.7.4. Disposal of Unusable Soils...................................................................................................1819.7.5. Erosion Control.....................................................................................................................181

9.7.6. Existing Underground Facilities............................................................................................182

9.8. Access..........................................................................................................................................182

9.9. Storm Water Drainage.................................................................................................................182



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9.9.1. Clean Storm-Water Sewer and Ditch System........................................................................183

9.9.2. Miscellaneous Valved Storm-Water Runoff.........................................................................184

9.9.3. Sanitary and Oily Waste Water Drainage Systems...............................................................184

9.9.4. Sanitary Wastewater.............................................................................................................184

9.9.5. Oil-Contaminated Wastewater Sewer System.......................................................................184

9.9.6. Process Wastewater..............................................................................................................185

9.10. Roads, Parking Lots, and Walkways..........................................................................................186

9.10.1. Facility Roads.....................................................................................................................186

9.10.2. Road Width and Clearance Requirements...........................................................................186

9.10.3. Road Pavement...................................................................................................................187

9.10.4. Parking Lots........................................................................................................................187

9.10.5. Chemical Unloading....................................................................................................... ....187

9.10.6. Facility Area Surfacing.......................................................................................................187

9.10.7. Surfacing Plan.....................................................................................................................189

9.11. Landscaping...............................................................................................................................189

9.12. Fencing and Signage..................................................................................................................189

9.13. Buildings............................................................................................................................ .......190

9.13.1. Location and Footprint of Buildings...................................................................................190

9.13.2. Building Requirements and Sizes............................................................................ ...........1919.13.3. Architectural............................................................................................................... ........195

9.13.4. Furnishings........................................................................................................................ .197

9.13.5. Building Systems................................................................................................................198

9.14. Foundations for Equipment and Structures................................................................................198

9.15. Concrete Work...........................................................................................................................199

9.16. Masonry Work...........................................................................................................................199

9.17. Steel Work.................................................................................................................................1999.17.1. Steel Grating and Steel Grating Stair Treads.......................................................................200

9.17.2. Stairs and Ladders...............................................................................................................200

9.18. Painting and Coatings............................................................................................................. ...201

9.19. Design........................................................................................................................................202



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9.20. Construction.................................................................................................................. ............203

9.21. Testing and Inspections................................................................................................. ............204

10. DOCUMENT SUBMITTALS........................................................................................205

10.1. Documents To Be Submitted For Purchaser Review and Comment..........................................205

10.2. Performance Curves...................................................................................................................209

10.3. Purchasers Right to Receive Additional Documents for Information.......................................210

10.4. Documents To Be Submitted Before Turnover of Facility ........................................................212

10.5. Drawings and Lists....................................................................................................................212

10.6. Instruction Books and Operating Manuals.................................................................................213



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1. OVERALL FACILITY CONFIGURATION

The Facility will include ______________ Units and other balance-of-plant (BOP)systems and facilities for a complete, fully operational, combined cycle Facility. Each

Unit will include identical ___________ combined cycle power islands and balance-of-

plant (BOP) systems and facilities associated with the Unit. Each power island includes

__________ combustion turbine generators (CTGs) with each CTG exhausting through a

multi-pressure-level, reheat, fired heat recovery steam generator (HRSG). Steam from the

HRSG will be fed to a steam turbine generator (STG). NOx emission control will be

accomplished using a dry low NOx (DLN) combustor as well as Selective Catalytic

Reduction (SCR) in the HRSG. An inlet air filtration system will be included to providesuitably filtered combustion air to the CTG. CGT inlet cooling will be provided.

Power for each Unit will be generated at ____ (CTG) and ____ (STG) and stepped up

through an individual main transformer to the Utility grid. An on-site switchyard shall bedesigned, furnished and installed to meet the interconnect utility, ISO and WCCP

requirements.

1.1. Major Components

The Facility shall consist of the following major components:

______ CTGs, complete with DLN combustors, inlet coolers, and all other

auxiliaries

______ three-pressure, reheat, unfired, horizontal gas flow HRSGs, each equipped

with an exhaust stack with dampers, transitions, expansion joints, an SCR system to control emissionsof NOx, a CO reduction catalyst system and all other auxiliaries

________single flow exhaust, reheat steam turbine generators with auxiliaries

1.2. Balance of Plant Support Systems

The BOP support systems include, but are not limited to, the following:

One Distributed Control System (DCS) for the combined cycle facility and

balance-of-plant (BOP) control, data acquisition and data analysis.

One natural gas system

One liquid fuel system, if applicable

Main steam systems, for each of the power islands, each including cascade-type

turbine bypass for high pressure, intermediate pressure and reheat steam, and turbine bypass directly to

the condenser

Condensate systems

Feedwater systems



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HRSG blowdown systems

Ammonia unloading, storage, and transfer systems

Interconnecting piping for combustion turbine liquid fuel system (if applicable),

and for steam turbine steam/condensate drain, lube oil, and seal steam systems Condenser and cooling towers or air cooled condensers and auxiliaries

Cooling water systems (including Wet Surface Air Condenser (WSAC) if

necessary for an air cooled configuration)

Raw water treatment system

Cycle makeup water treatment system

Feed water tank

Fire/filtered water storage tank

Demineralized water storage tanks

Chemical storage and injection systems for the condensate and feedwater systems

Hypochlorite storage and injection system , if required

Domestic (potable) water system, including well or utility interconnect

Sanitary waste system

Process waste water system

Fire detection, alarm, and suppression systems

Instrument air system

Service air system

Permanent Facility communications system

Heating, ventilating and air conditioning (HVAC) systems

Storm water management system

Sampling system

Emergency power system, including emergency electric power generator

Electric power distribution system

Lighting system

Lightning protection system

Cathodic protection system

Freeze Protection system, if required by environmental conditions

Grounding system

Expansion joints

Roads (including the access road), fencing and parking



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Transmission interconnection facilities,

Continuous Emissions Monitoring System (CEMS), and Data Acquisition and

Handling System (DAHS)

Administrative and maintenance buildings Hydrogen gas trailer or skid (if applicable,) and other bottle gases (e.g., CEMS,

CO2)

Natural gas line and on-site metering station per the pipeline company interconnect

requirements

Electrical transmission tie-in

Interfaces with the above temporary or mobile systems including mobile

demineralizer trailers.

2. SITE CONDITIONS

The facility shall be designed in accordance with the Site Conditions specified in

Appendix N3.

2.1. Site Elevation and Barometric Pressure

The facility shall be designed based on the site elevation listed in Appendix N3.

2.2. Temperatures

Equipment shall be designed to operate and stand down without damage throughout the

temperature range listed in Appendix N3.

2.3. Precipitation, Wind and Earthquake

The Facility shall be designed for the maximum rainfall conditions listed in Appendix

N3. Snow Load (if applicable)

Design snow loads shall be in accordance with the requirements set forth in the CaliforniaBuilding Code and or local governing building code.

Design wind loads shall be in accordance with the requirements set forth in the California

Building Code and or local governing building code. The Importance Factor for wind

shall be 1.0 (non-essential facility). The applicable basic wind velocity in mph and the

site specific exposure (B, C or D) is listed in Appendix N3.

Seismic design loads shall be in accordance with the requirements set forth in the

California Building and or local governing building code. The applicable seismic zone

shall be either Zone 4 or Zone 3 for the specific site location. The site shall be assigned a



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soil profile type as substantiated by geotechnical data for the specific site. The

Importance Factor for seismic shall be 1.0 (non-essential facility). The applicable seismic

zone, soil profile type, and seismic coefficients Ca and Cv are listed in Appendix N3.

The site footprint shall not be located in a floodplain.

3. CODES AND STANDARDS

Systems and equipment shall be designed in accordance with Codes and Standards,

Regulations, Governmental Approvals and Governmental Rules in effect at the date of

execution of this Contract. Applicable sections of Governmental Rules will be referencedas required in the relevant technical specifications. In case of conflict among this Scope

Document, referenced Governmental Rules, and manufacturer's standard practices, the

Purchaser shall determine which will govern. Where there are no applicable

Governmental Rules, power industry practices shall apply.

3.1. State and Local Building Codes, Standards andOrdinances

Code, Rules and Regulations of the State of California

California Building Code

California OSHA (CALOSHA)

Local laws, ordinances, and regulations

3.2. U.S. Government Codes, Ordinances, and Standards

Occupational Safety and Health Act (0SHA) - 29 CFR 1910, 1926

Federal Aviation Agency (FAA) - Obstruction Marking and Lighting AC No.

70/7460-IJ)

Environmental Protection Agency (EPA) - 40 CFR 423, 40 CFR 60, 40 CFR 72,

40 CFR 75, 40 CFR 112

Appendix A to Part 36, American Disability Act Accessibility Guidelines for

Buildings and Facilities

3.3. American Society of Mechanical Engineers

The following standards of the American Society of Mechanical Engineers (ASME) shall

be followed:

ASME Boiler and Pressure Vessel Code Sections:

I Power Boilers



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B133.8 Gas Turbine Installation Sound Emissions

C2 National Electrical Safety Code

C37.010 Application Guide for AC High Voltage Circuit Breakers Rated on

a Symmetrical Current Basis C37.04 Standard Rating Structure for AC High Voltage Circuit Breakers

Rated on a Symmetrical Current Basis

C37.06 Switchgear - AC High Voltage Circuit Breakers Rated on a

Symmetrical Current Basis -Preferred Ratings and Related Required Capabilities

C37.13 Standard for low Voltage AC Power Circuit Breakers Used inEnclosures

C37.20.1 Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker

Switchgear

C37.20.2 Standard Metal-Clad and Station-Type Cubicle Switchgear

C37.23 Guide for Metal-Enclosed Bus and Calculating Losses in

Isolated-Phase Bus

C37.30 Definitions and Requirements for High-Voltage Air Switches,

Insulators, and Bus Supports

C50.41 Polyphase Induction Motors for Power Generating Stations

C57.12.10 Transformers - 230 kV and below, 833/958 through 8,333/110,417

kVA Single Phase and 750/862 through 60,000/80,000/100,000 kVA Three Phase without Load Tap C

Changing, and 3,750/4,682 through 60,000/80,000/100,000 kVA With Load Tap Changing- Safety

Requirements

C57.12.55 Transformers - Dry-Type Transformers Used in Unit Installation,Including Unit Substations

C57.12.70 Terminal Markings and Connections for Distribution and Power

Transformers

C57.13 Standard Requirements for Instrument Transformers

C57.109 Guide for Transformer Through-Fault-Current Duration

C62.11 Standard for Metal-Oxide Surge Arresters for AC Power Circuits

3.5. Industry Standards

Applicable standards issued by the following industry organizations:

American Association of State Highway and Transportation Officials (AASHTO)

American Boiler Manufacturers Association (ABMA)

American Concrete Institute (ACI)

American Gas Association (AGA)



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American Gear Manufacturers Association (AGMA)

American Institute of Steel Construction (AISC)

American Iron and Steel Institute (AISI)

Air Moving and Conditioning Association (AMCA)

American National Standards Institute (ANSI)

American Petroleum Institute (API)

American Society for Nondestructive Testing (ASNT)

American Society for Testing and Materials (ASTM)

American Society of Heating, Refrigerating, and Air-Conditioning Engineers(ASHRAE)

American Water Works Association (AWWA)

American Welding Society (AWS)

Anti-Friction Bearing Manufacturers Association (AFBMA)

Crane Equipment Manufacturers Association of America (CMMA)

Expansion Joint Manufactures Association (EJMA)

Fluid Control Institute (FCI)

Heat Exchange Institute (HEI)

Hydraulic Institute (HI) - Standard for Pumps

Illuminating Engineering Society (IES)

Institute of Electrical and Electronics Engineers (IEEE)

Insulated Cable Engineers Association (ICEA)

Instrument Society of America (ISA)

Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry

Metal Building Manufacturers Association (MBMA)

National Association of Corrosion Engineers (NACE)

National Electrical Manufacturers Association (NEMA)

National Fire Protection Association (NFPA) National Fire Codes

Pipe Fabrication Institute (PFI)

Sheet Metal and Air Conditioning Contractors National Association (SMACNA)

Steel Structures Painting Council (SSPC)

Thermal Insulation Manufacturers Association (TIMA)

Tubular Exchanger Manufacturers Association (TEMA)



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Underwriters Laboratories, Inc. (UL) - fire protection equipment only

Welding Research Council (WRC)

3.6. Electric Utility Requirements

California ISO

PG&E Interconnection Requirements see www.pge.com/about/rates/tariffbook/ferc/tih/

Western Electricity Coordinating Council (WECC)

California Energy Commission

Utility interconnect requirements for fuel (gas), power transmission, and water.

4. TECHNICAL REQUIREMENTS

Long-term safety, reliability, operability, and maintainability of the Facility are of

primary concern to the Purchaser. As a result, the Seller shall take prudent measures inthe design to facilitate ease of operation and provide adequate access to all equipment.

Where required to perform normal maintenance functions, facilities such as equipment

removal monorails shall be provided. Wherever practical, valves and instruments shall be

located such that they can be operated and easily accessed from grade. Where valves and

instruments normally requiring operator access must be located in elevated locations,

access platforms, handrails, and ladders shall be provided. All valves (including safety

and relief valves) and components shall be accessible for routine maintenance.Minimumclearance over walkways and platforms shall be 7'-6". Adequate provisions for removal

of the generator rotor and turbine maintenance and laydown must be provided in the

general arrangement proposed by the Seller. Platform access with stairs shall be providedto all metering and custody transfer points that are not readily accessible from grade. All

task lighting applications shall be arranged to provide shadow-free lighting for the area.

The proposed layout must accommodate concurrent maintenance on the steam turbine

and one of the combustion turbines with separate cranes. All lifting devices shall be

clearly stenciled with rated lifting capacity. Provisions for a maintenance trailer area

along with associated electrical, phone, and internet connections are required.

Facilities provided by the Seller must be adequate to support the number of individuals

who will be assigned to the Facility on a continuing basis, both during maintenance and

normal operations. Facilities required to support maintenance crews during maintenance

inspections/overhauls will be brought onsite on a temporary basis.

Plant must be automated and designed to be started, stopped, and operated with no more

than the specified number of employees specified in Appendix J of Sellers Offer.

Equipment or other items that contain PCBs, asbestos, or asbestos-bearing materials are

prohibited from use, as are instruments containing mercury. All hazardous and

non-hazardous wastes generated during the construction process shall be collected and

segregated by the Seller and stored in a secure area in properly labeled drums, which

http://www.pge.com/about/rates/tariffbook/ferc/tih/http://www.pge.com/about/rates/tariffbook/ferc/tih/


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identify the wastes contained. Disposal of such wastes shall be the responsibility of the

Seller, using the services of properly licensed technically capable subcontractors. The

Seller shall comply with all applicable local, state, and federal regulations.

Nametags and nameplates shall be provided for all equipment and instruments supplied

under this Contract. Nameplates or tags shall be constructed of stainless steel and should

be stamped, as a minimum, with the manufacturer's name, the purchase order number

under which the item was purchased, and the equipment identification number used to

identify that piece of equipment on the Seller's drawings. Nametags shall either be

permanently attached to the equipment using rivets or stainless steel machine screws or

shall be wired to the item using stainless steel wire.

The design and layout of equipment within the Facility boundary shall meet Occupational

Safety and Health Administration (OSHA) and California OSHA (CALOSHA)

permissible noise exposure levels without the use of hearing protection for a 12-hourduration per day. Where this is not practicable, with Purchasers approval, these areas

may be designate as high-noise-level areas with limits indicated on the general

arrangement. In any case, the local noise ordinance shall be met, unless a variance can beobtained from the local authority. Plant noise levels shall be within permit specifications

under all operating conditions.

Signs, fire extinguishers, marking of high noise areas requiring hearing protection, and

other items needed to meet OSHA regulations and otherwise ensure minimal risk to

personnel health and safety while at the Facility shall be provided.

All outdoor equipment and materials shall be designed and installed consistent with

expected use and environmental conditions (e.g., freeze protection, moisture & dust

controls, cooling and ventilation, heat tracing and insulation for electrical motors,

cabinets/load centers, sample, trap and chemical feed lines, etc.).

All plant equipment (pumps and motors) shall be fully isolatable to facilitate maintenance

repairs or replacement. The plant shall be designed to provide the ability to isolate each

combustion turbine generator/HRSG train independently to perform shut down work

while continuing to generate with a remaining train.

All major outside utility piping interfaces (such as incoming raw water, natural gas, and

outgoing wastewater) must be fully metered with revenue-quality instrumentation.

Power augmentation such as fogging, evaporative cooling, and steam injection may be

used provided it meets all OEM requirements.

4.1. System Descriptions

System descriptions shall be submitted to Purchaser for approval no less than four

months before the start of the operator training program. PG&E will provide the typical

format to be used for draft system descriptions. Final system descriptions shall be revised

to reflect as-built conditions.



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4.2. Plant Identification System

The Seller shall use a uniform designation and numbering system for all plant systems

and equipment and across the entire site. The designation and numbering system shall be

coded to designate unit number or common facilities, process system, equipment name,

subcomponent or function name. The designations shall be used on all drawings,

schedules, descriptions, and other documents as well as on all nameplates, tags, and othermarkings.

Equipment shall be numbered according to the following convention:

North to South increasing numbers

East to West increasing numbers.

The Seller shall ensure that all numbering and nomenclature of high voltage apparatus

will be in accordance with PG&E Interconnection Handbook.

Each equipment, motor, valve, instrument, control panel and pertaining apparatus shall be

provided with nameplates or tags indicating their purpose and identification designation.

The label shall also include the normal operating position for all shut-off valves. All

actuated valve tags shall include the valve and actuator reference number.

Nameplate surfaces for cubicles and control equipment shall have a matt or satin finish to

avoid dazzle. Equipment identification and components may use engraved plastic or

weatherproof nameplates, where appropriate. Name tags used on valves and

instrumentation shall be permanently attached to the equipment using rivets, machine

screws or stainless steel wire.

All major equipment shall be provided with data plates, indicating the name ofmanufacturer, type, serial number, year of fabrication, main characteristics and other

information, as appropriate.

All components of the various pipe systems shall be clearly identified. Piping shall be

painted and/or marked in accordance with the fluid contained according to agreed and

approved power plant color code. Where color coding is impractical, the type of fluid

contained in the pipe shall be permanently stenciled onto the exterior surface of the pipe

or the pipe cladding at a maximum interval of every 15 feet. Piping containing hazardous

materials shall be labeled in accordance to ANSI A13.1. Both ends of all power andinstrument cables shall be clearly identified. A standard system of colors for cable cores

and wire color used for the wires in all panels, cubicles and cabinets shall be specified

and used by the Seller.

4.3. Supplier Factory Tests

Seller specifications will require certain factory/functional tests of selected equipment,

including, but not limited to, the following:



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Combustion turbine including starting motor/torque converter/gearbox and

generator

Steam turbine and generator

Heat recovery steam generator Selective catalytic reduction system

Air-cooled condenser and auxiliaries

Boiler feed pump

Main transformers

Generator excitation system

Station service transformer

Air cooled heat exchangers

Water cooled heat exchangers

DCS

CEMS/DAHS (review of system software)

Tests will be required for other equipment as considered appropriate by Purchaser.

A preliminary list of witness and hold points to be developed by Seller and approved by

Purchaser.

Seller will review suppliers certified test data for compliance with specified performance

and functional criteria. Seller shall provide Buyer with test results as requested and

provide the opportunity for Purchaser to witness tests.

4.4. Testing

Shop inspection and testing will be conducted in accordance with the requirements of

applicable codes and standards.

Seller shall furnish a table for approval by Purchaser showing inspection and testing for

all major purchase orders and field erected piping.

Pressure vessels will be shop tested per ASME Section VIII. Atmospheric tanks will be

hydrotested by filling with water. Welders will be certified per applicable codes.

Prefabricated piping to be skid-mounted will be hydrotested per ASME B 31.1 at the

fabricators shop when required by the applicable code or standard.

After assembly, piping systems will be given a leak test.

Assembled equipment will be visually examined.



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Certified pump performance curves will be supplied for each pump based on previous

tests conducted by the vendors, except condensate pumps and boiler feed pumps, which

will be tested.

A complete functional checkout of the control panel and controls will be done at the

manufacturers shop before shipment.

Pressure testing, including pressure testing at 1.5 times the design pressure (unless noted

otherwise), will be specified and performed for pressure components. All pipe joints must

be exposed where pipe insulation is installed before the pressure testing. Pressure testing

shall include but not be limited to the following equipment and piping systems:

Pump casings

HP/IP steam system

HP feedwater system

Fire protection system (test pressure per NFPA)

Fuel gas system

Liquid fuel system, if applicable

Chemical feed systems

SCR ammonia system

All underground piping (other NDE may be accepted for makeup water and

blowdown piping subject to prior written Purchaser approval)

Condenser air removal system

Closed cooling water system

Potable water system

Makeup water system

Condensate system

Demineralized water system

Blowdown system

If used, the ACC will be leak tested (low pressure pneumatic test) before being placed in

service.

Water will normally be used as the test medium for hydrostatic testing. The water will beclean and will be of such quality as to minimize corrosion of the materials in the piping

system. The hydrostatic test pressure will not be less than 1.5 times the design pressure,but will not exceed the maximum allowable test pressure of any non-isolated

components, such as vessels, pumps, or valves. Pneumatic testing will not be used unless

approved by the Purchaser.

For non-water systems, water will be drained and piping/equipment will be dried before

placing the system in service.



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Suppliers standard functional field tests will be performed on the Facility systems and

associated components during startup.

Code stamped pressure vessels will be shop tested hydrostatically per the code.

Purchaser may, from time to time, make visual examination of the equipment and the

conditions under which it is being manufactured, both at the manufacturers work and on

site.

4.5. Welding

Welders and welding procedures will be certified in accordance with the requirements of

the applicable codes and standards before performing any welding. Seller will maintain

indexed records of welder qualifications and weld procedures. Welders engaged in on-

site welding will be supervised.

Welding of ferrous piping will be in accordance with ASME B31.1 and ASME SectionIX of the Boiler and Pressure Vessel Code, as well as industry standards. Fusion welding

of high-density polyethylene pipe will be performed in accordance with themanufacturer's recommendations using equipment approved for this purpose by the

manufacturer.

Electrodes and/or welding rods to be used and the fabrication procedure to be adopted

will be in accordance with the applicable code or standard.

Before welding, the work will be heated, where necessary, in an approved manner, and

the temperature will be maintained throughout the operation.

After completion of welding, fabricated parts will be stress relieved as required byapplicable code or standard.

The extent of weld inspection and the final weld quality will comply with the applicable

standard or code. Nonconformance in welds is not acceptable. Indexed records of welder

qualifications, weld procedures, and weld inspection and repair reports shall be available

for inspection by Purchaser.

4.6. Lubrication

The types of lubrication specified for Facility equipment will be suited to the operating

conditions, will be in the beginning of the lubrications life cycle, and will comply withthe recommendations of the equipment manufacturers at the time of facility turnover.

Rotating equipment will be splash lubricated, force lubricated, or self-lubricated. Oil cups

will be provided as necessary. Where automatic lubricators are fitted to equipment,

provisions for emergency hand lubrication will also be specified. Where applicable,

equipment will be designed for manual lubrication without the removal of protective

guards while the equipment is in operation. Lubrication fill, drain and sample points will



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be readily accessible. Manual lubrication provisions will be external to guards with

machinery in motion.

Wherever possible, the lubricants proposed will be readily available.

The types of lubrication specified for the Facility equipment will be suited to the

operating conditions and will comply with the recommendations of the equipment

manufacturers.

4.7. Consumables

Seller shall replenish the Facility consumables (demineralizer water, chemicals, gases and

other) such that at Turnover of the facility Purchaser has a full supply.

5. OPERATIONAL REQUIREMENTS

The Facility will be designed so that each Unit may be operated independently, and a

single failure of mechanical equipment common to all Units will not trip any operating

Unit.

The Facility and each Unit will be fully dispatchable with automatic generation control

(AGC). The Facility and each Unit will be capable of being dispatched from minimum to

full load, as specified in Appendix G. The Facility and each Unit will also be capable of

cycling operation. Balance-of-plant design will not limit CTG operation over the fullrange of site ambient conditions.

The Facility will be started without a source of auxiliary steam. All steam required forstartup will be provided by the HRSG. Excess steam generated during startup of the first

Unit will be vented to atmosphere through silenced, startup vent valves. Once the steam

seals have been established in the STG, excess steam will be bypassed to the condenser.

Cross ties shall be provided so that steam from an operating Unit can supply steam for

startup of the remaining Units. Design of the Facility shall consider limitations on

emissions imposed by the local air district and the CEC.

The Facility does not need to have black start capability. An independent dual source of

power from the electric utility is required to meet house loads, including operation of all

necessary standby equipment and systems.

The sequence of startup varies only slightly depending upon whether the CTG is cold,

warm or hot. However, the duration of a start-up will be dependent on the initialconditions of the plant. Each of the units that comprise the facility shall be designed to

achieve the startup times listed in Appendix N3 for the specified shutdown periods for

each Unit.

The startup and shutdown operational requirements include:

Ability to turn-down to 55% of full baseload power output or lower.



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Automatic Generation Control (AGC) and load following over the full turn-down

range (55% to 100%), in accordance with the California ISOs Generation Monitoring and Control

Requirements for AGC/Regulation Units as can be found on their web site athttp://www.caiso.com/docs/09003a6080/1b/23/09003a60801b2389ex.html

Maximum allowable hot-start time of 90 minutes including all pre-ignition purgesand other permissives. Offers shall note the portion of the plant output that can be delivered within ten

minutes of request to start, and shall note any limitations to and consequences of using of this quick

starting capability.

Maximum allowable cold-start time of 4.5 hours.

Minimum downtime between combustion turbine restarts of 60 minutes.

Minimum ramp rate of 7% of guaranteed capacity per minute per combustion

turbine.

Ability to complete a hot shutdown to hot re-start cycle in less than three hours.

300 annual starts including approximately 25 cold starts.

Minimum Run Time 4 hours or less per start.

A facility that meets all NERC requirements (cyber, site security, other).

A facility that meets the CAISO interconnection requirements including metering

and ancillary service provisions.

Alternate power source or back-up generator to meet essential loads.

Ability to meet all air emissions criteria at startup, shutdown, and for all operating

loads.

6. MAJOR MECHANICAL EQUIPMENT AND SYSTEMS

6.1. Combustion Turbine

Equipment is to be of proven design with large number of units in operation and

experiencing high reliability track record.

The compressor shall be a multistage axial-type and shall be directly coupled to the

turbine section. Modulating inlet air guide vanes shall be provided.

The combustion system shall be designed to maximize combustion efficiency,

combustion stability, and equipment life while meeting air emissions requirements while

firing natural gas. Control of NOx emissions shall be through dry low NOx combustors.

If liquid fuel is to be used for a back up fuel supply, the combustion system shall be

similarly designed to deliver efficient, stable, long life compliance.



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The combustion controls for the dry combustion system shall automatically regulate the

proper fuel flow and mixture to meet the emissions criteria.

The turbine blades shall be designed to minimize loads due to tangential, axial, and

torsional modes of vibration under all anticipated operating conditions.

Turbine blades and nozzles shall be coated as necessary to prevent degradation from

erosion, corrosion, or deposits. Components to be coated and coatings to be used shall be

identified in the proposal. Blade coatings must be available domestically.

A complete lubrication and control oil system including reservoir, pumps, filters,

pressure regulation, cooling-heating, circulating pipe to the turbine shall be provided as

described in section 6.3.1.

6.1.1. Turbine Supervisory Instrumentation

A complete Bentley Nevada 3500 or equal turbine supervisory instrumentation (TSI)system with locally mounted supervisory instruments required for safe startup, operation,

and shutdown of the turbine generator shall be provided which includes the following:

Vibration monitor on all the combustion turbine generator bearings using X and Y

vibration probes.

Rotor speed and one zero speed sensor.

Key phasers, three-speed and one zero-speed sensors (rotor speed).

Temperature measurements of turbine metal, CTG bearing, and generator stator.

Full data acquisition and facility control through the DCS automatic and manual

synchronizers.

6.1.2. Inlet Air Filter

The inlet filters to the combustion turbines shall be provided meeting the requirements of

the combustion turbine supplier. The filters shall be selected to meet the ambient

conditions and shall account for severe weather conditions such as icing, heavy rain, fog,

or dust conditions that result in high differential pressures.

A self-cleaning pulse-type filter shall be used unless not permitted by local environmental

conditions. The filters shall be selected and sized to provide minimum installed site life

of 36 months.

The high-efficiency cartridge filters shall be designed for 99.9% efficiency for removing

particles 5 micrometers (microns) and larger and 99% efficient in removing particles

2 microns and larger. The face velocity (horizontal component of the airflow) through the

filter media shall not exceed 500 ft/min.

Filter media shall be Donaldson Spiderweb or equivalent with minimum 4-year life

expectancy.



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The inlet air filter system shall include the following:

Stairways, and platforms (for access and maintenance) meeting OSHA

requirements.

Interior lighting and convenience outlets. Lifting facilities for raising and lowering filter elements from grade level to the

filter element access elevation.

A louver or weather hood to minimize the entry of rain into inlet filter.

A debris/bird screen immediately ahead of the inlet filter openings to prevent

debris and birds from entering inlet will be provided. The metal inlet screen shall not have larger than

one-inch mesh. Inlets shall have drainage holes to prevent standing water during outages.

Differential pressure measurement across filters linked through the DCS to allow

assessment of the optimum period to change the filter pads.

A system to indicate possible inlet icing conditions (where icing conditions can be

expected). Windows shall be located in inlet ducts with lighting to enable on-line observation of theinlet scroll and inlet guide vanes.

Filter designed to minimize re-depositing particles expelled during pulsing.

Enclosure sufficiently rigid to avoid vibration problems. Fasteners shall be suitablylocked to prevent loosening especially those on the inlet that could be ingested by the compressor.

Manufacturers standard air inlet filter. Inlet face velocity shall not exceed

500 ft/min with high efficiency filters meeting the combustion turbine manufacturers requirements.

Ability to change inlet air filters during on line operation with no load curtailment.

6.1.3. Acoustic Enclosures

The combustion turbine-generator package shall be enclosed by several connected

sections of weather protective housing structurally attached to the compartment base.

These enclosures shall provide ventilation (with 100% redundancy), thermal insulation,

acoustical attenuation, and fire protection media containment.

6.1.4. Water Wash System

Online CTG compressor water wash systems with drains shall be provided. All valves

shall be accessible for routine maintenance. A single wash-water skid-mounted system

with permanent piping to all combustion turbines shall be provided.

A separate CTG water wash drain system shall be provided for each Unit.

Waste water from the CTG during and after an off-line water wash procedure shall be

collected in a sump with capability to transfer the collected waste to the turbine building

sump.



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6.1.5. Combustion Turbine Exhaust Duct

The stainless steel liner covering system shall consist of mineral wool and ceramic fiber

insulation and an interior stainless steel liner. Insulation shall be retained to prevent

packing. The liner shall be retained in such a manner as to prevent movement

perpendicular to the duct and to allow axial thermal expansion and contraction.

Provisions at overlaps shall be provided to prevent the liner from buckling or being lifted

by gas flow velocities in the duct.

6.2. Heat Recovery Steam Generator

The HRSG shall be of proven design with large number of units in operation and with atrack record of high reliability.

Steam headers and tubes designed and constructed with materials suitable for 300 startupcycles per year and 30-year life cycle.

The HRSG shall be designed to operate in a floating-pressure and fixed-pressure mode.

Seller shall meet the Facility startup times and provide detailed explanation of the startup

sequence.

The HRSG shall be designed, fabricated, and stamped in accordance with the ASME

Boiler and Pressure Vessel Code (B&PVC), Section I and all codes and standards

required therein. Any additional state or local requirements for certification of the HRSG

pressure vessel shall be met. All materials not covered by ASME codes shall conform to

the latest edition of the ASTM standard. The Purchaser must approve other materials

being considered.

The HRSG shall be supplementary fired with natural gas only. The HRSG will bedesigned not to have flame impingement.

The HRSG will have space allocated for future addition of SCR and CO catalyst if the

licensing requirements do not include these catalysts. If either catalysts are provided,

additional space for future addition of one layer of catalyst shall be provided.

The HRSG shall be suitable for operation at all loads from startup to the rated maximum

steam generating capacity. The turndown ratio and rate of load change of the HRSG shall

be compatible with the combustion turbine as far as possible. HRSG design shall include

a condensate heater bypass to maintain the minimum specified gas outlet temperature. A

recirculation system shall also be provided for