32-SAMSS-100

Previous Issue: 25 January 2006 Next Planned Update: 30 November 2012 Page 1 of 35 Primary contact: Sabban, Mahmoud Abdulrahim on 966-3-8760124

Copyright©Saudi Aramco 2007. All rights reserved.

Materials System Specification

32-SAMSS-100 1 December 2007 Combustion Gas Turbines

Gas Turbines & Diesel Engines Standards Committee Members Sabri, Hasan Abdulrahman, Chairman Sabban, Mahmoud Abdulrahim, Vice Chairman Beckenbach, Joseph William Fagihi, Ali Saoud Hussain, Khaleel Ma'Atug Issa, Mohammad Abdallah Jamea, Khalid Hamad Khalifah, Khalifah Sa'Ad Khowaiter, Abdul Rahman Othman Odan, Nabeel Mohammad Saeed, Mustafa Taher Saffar, Adel Abdullah

Saudi Aramco DeskTop Standards Table of Contents 1 Scope............................................................. 2 2 Conflicts and Deviations................................. 2 3 References..................................................... 2 4 General…………………………………………..4 5 Design............................................................ 8 6 Inspection..................................................... 31 7 Testing.......................................................... 31 Appendix I – Definitions...................................... 34

Document Responsibility: Gas Turbines & Diesel Engines 32-SAMSS-100

Issue Date: 1 December 2007

Next Planned Update: 30 November 2012 Combustion Gas Turbines

Page 2 of 35

1 Scope

1.1 This Specification defines the mandatory minimum requirements for design,

manufacture and installation of gas turbine packages for the applications of

mechanical and power generation drives. This entire Specification may be

attached to and made a part of purchase orders.

1.2 The gas turbine package includes a base frame or a plate, accessory and

auxiliary systems for starting, stopping, protecting, controlling and monitoring

the gas turbine.

2 Conflicts and Deviations

2.1 Any conflicts between this Specification and other applicable Materials System

Specifications (SAMSSs), Standard Drawings (SASDs) or industry standards,

codes and forms shall be resolved in writing by the Company or Buyer

Representative through the Manager, Consulting Services Department, Saudi

Aramco, Dhahran.

2.2 Direct all requests to deviate from this Specification in writing to the Company

or Buyer Representative to be forwarded to the Manager, Consulting Services

Department, Saudi Aramco, Dhahran.

3 References

The selection of material and equipment and the design, construction, and repair of

equipment and facilities covered by this Specification shall comply with the references

listed below, unless otherwise noted.

3.1 Saudi Aramco References

Saudi Aramco Materials System Specifications

32-SAMSS-008 Inlet Air Filtration Systems for Combustion Gas

Turbines

34-SAMSS-625 Machinery Protection Systems

34-SAMSS-831 Instrumentations for Packaged Units

Saudi Aramco Standard Drawing

AB-036322 Sht. 001 Anchor Bolt Details – Inch and Metric Sizes

Saudi Aramco Forms and Data Sheets

7305-ENG Equipment Noise Data Sheet

../../SAMSS/PDF/32-SAMSS-008.pdf



../../../Standard_Drawings/PDF/AB-036322-001.PDF

../../../Forms_Data_Sheets/XLS/SA-7305.XLS




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8002-ENG & Combustion Gas Turbine Data Sheets

8002-M-ENG

Saudi Aramco Inspection Requirements

Form 175-325501 Combustion Gas Turbine Package

thru 325519

Saudi Aramco Product Specification

A-888 Diesel

3.2 Industry Codes and Standards

American Concrete Institute

ACI 318 Building Code Requirements for Structural

Concrete

American Institute of Steel Construction

AISC Code of Standard Practice for Steel Buildings and

Bridges

American National Standards Institute

ANSI MC96.1 Temperature Measurement Thermocouples

American Petroleum Institute

API STD 614 Lubrication, Shaft Sealing and Control Oil

Systems for Special Purpose Applications

API STD 616 Gas Turbines for Refinery Services

American Society of Mechanical Engineers

ASME B1.21.1 Pipe Threads, General Purpose

ASME B16.5 Pipe Flanges and Flanged Fittings

ASME B31.1 Power Piping

ASME PTC 1 General Instructions (Performance Test Code)

ASME PTC 4.4 Performance Testing of Heat Recovery Steam

Generation

ASME PTC 22 Performance Test Code on Gas Turbines

ASME SEC VIII Boiler and Pressure Vessel Code/Pressure Vessels

ASME SEC IX Standard for Welding and Brazing Procedures

../../../Forms_Data_Sheets/XLS/SA-8002-1.XLS

../../../Forms_Data_Sheets/XLS/SA-8002-M-1.XLS

../../../Inspection_Requirements/PDF/175-325501.pdf





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International Electrotechnical Commission

IEC 60502-1 Power Cables with Extruded Insulation and

theirAccessories for Rated Voltages from 1 kV

up to 30 kV - Part 1: Cables for Rated Voltages

of 1 kV and 3 kV

NACE International

NACE MR0175 Materials for use in H2S-containing

2002 Edition Environments in Oil and Gas Production

US Environmental Protection Agency

USEPA Method 1, Section 2.5, Gas Flow Angles and Sampling Procedure

40 CFR 60, Appendix A

National Fire Protection Association

NFPA 12 Carbon Dioxide Extinguishing Systems

NFPA 70 National Electric Code

NFPA 72 National Fire Alarm Code

Process Industry Practices

STF05501 Fixed Ladders and Cages

STF05511 Fixed Industrial Stairs

STF05520 Pipe Railing for Walking and Working Surface

Details

STF05521 Details for Angle Railing for Walking and

Working Surfaces

STF05530 Grating Details

4 General

4.1 Gas turbine units shall be supplied by Vendors qualified by experience. To

qualify, the Vendor must have manufactured at least two turbines of identical or

greater speed, firing temperature and power rating for operation on fuels of

similar specification. These turbines must have been in continuous service for at

least two (2) years and must be performing satisfactorily. Both the gas turbine

and inlet air filter element vendors shall be selected from Saudi Aramco

Regulated Vendor List (RVL).




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Alternatively, the Vendor may satisfy this experience requirement based on an

individual component life in comparable or more severe service conditions.

Experience need not be concentrated in a single turbine unit but may be spread

through separate operating turbine components such as gas generators and

power turbines. To qualify, however, each of the referenced turbines must have

been in continuous service for at least Two (2) years and must be performing

satisfactorily.

For vendors new to Saudi Aramco, documentation substantiating the Vendor's

prior experience and existing resources and capabilities shall be submitted

through the Company or Buyer Representative to be reviewed for compliance by

the Chairman, Gas Turbines & Diesel Engines Standards Committee, Consulting

Services Department prior to order placement. The Vendor shall provide

contact names of other Users and locations of shipped units to enable

verification of satisfactory field operation of referenced turbines. Also, the

vendor shall provide a list of all approved repair shops.

When other fuels such as natural gas liquids, liquefied petroleum gas, crude oil,

residual fuel oils and heavy distillate fuels are used, the Vendor shall provide, as

part of the experience qualifications, documented evidence of prior successful

experience of burning the contract defined fuels in the proposed turbine and the

effect on turbine rating, availability, reliability, parts life and frequency of

inspections and overhauls.

4.2 ISO Rating

4.2.1 The Vendor shall identify location of inlet and exhaust conditions used

in determining the unit's performance. Typically, the inlet conditions

are measured at the compressor inlet flange and the exhaust conditions

are measured at the turbine exhaust flange.

4.2.2 When required, the power is measured at the output shaft for

mechanical drive units. For generator trains, the power is measured in

MWe at the generator output terminals.

4.3 Life Requirements

4.3.1 The life requirements for major components shall be based on a base

load operation, burning natural gas fuel, and a minimum of 90 annual

starts (or more), with an average of 100 hours between starts.

4.3.2 For both the aero-derivate and heavy duty industrial combustion gas

turbine (CGT) units, the Vendor shall submit the following in the

proposal to be used in the Life Cycle Cost (LCC) analysis:




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a) A detailed breakdown of the unit required inspection intervals for

dry natural gas fuel at base load operation condition, and for

other fuels when specified in the data sheets. The information

shall include manhours to perform typical inspections, outage

times, and correction factors for inspection intervals for different

loads and number of starts.

b) A detailed maintenance plan, including parts replacement

schedule for a 20 years period and a certified current cost of

spare parts.

c) The fleet reliability and availability figures.

4.4 Performance, Power, Speed and Emission Requirements

4.4.1 The Vendor shall account for and provide all performance correction

factors (from ISO conditions) including the effects of temperature,

elevation, humidity (maximum humidity at site maximum

temperature), and gearbox, transmission, and other losses, if any.

4.4.2 Packages used for mechanical drive or power generation, which are not

connected to the national electric grid, shall have a guaranteed

available power (hp, kW), at the site rated conditions, of 10% or

greater above the required load.

4.4.3 The following information shall be also included in the Vendor's

proposal and in the operating and maintenance manual (O&M):

a) Performance curves (or correction factors) of the following

parameters versus compressor inlet or ambient temperature;

Power output and heat rate.

Inlet and exhaust airflow rates.

Heat rate versus load.

Exhaust temperature versus load.

Exhaust flow rate versus load.

Maximum and Minimum continuous speed.

b) The following curves shall also be submitted by the Vendor:

For Mechanical drive units, the output shaft power and heat

rate versus output shaft speed for the specified speed range

(e.g., 50% to 105 %) at the site rated conditions.




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Inlet and exhaust pressure drop effects (including inlet filters,

inlet and exhaust silencers and inlet and exhaust ducts) on the

unit output shaft power and heat rate.

Expected performance degradation curve versus time (e.g.,

power output & efficiency (performance loss) versus number

of equivalent operating hours).

Output power and heat rate curves versus ambient humidity.

c) Output Shaft Speeds (for mechanical drive units):

Output shaft speed(s), at design and at rated conditions.

The maximum continuous speed; this shall be at least equal to

105% of the highest speed required by the driven equipment.

The minimum operating speeds.

The shaft(s) critical speeds.

d) Minimum and maximum generator power output.

e) Load factors for power generation units.

f) Load-gear load limits, if applicable.

g) Emissions (i.e., NOx & CO) curves across the proposed unit's full

operating range and emission correction curves of all impacting

parameters.

h) Reference list of similar engines to include contacts of current

users.

4.5 Unless otherwise specified, the turbine Vendor is assigned the responsibility for

the complete train (including driven equipment and related auxiliaries). This

responsibility means trouble-free startup and operation for the specified

operating hours of the entire train of equipment comprising gas turbine, power

transmission, driven equipment and accessory and auxiliary equipment. This

responsibility shall include the following:

- Common control system;

- Power transmission components;

- Equipment layout and baseplate design, if applicable;

- All vendor supplied accessory and auxiliary equipment, including the

supplied fuel and lube oil systems;

- Monitoring and protection systems;




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- GT compressor washing systems;

- GT turbine washing system if ash forming fuels are specified;

- Performance and guarantee of the complete train;

- Lateral and torsional dynamic analyses;

- Noise attenuation.

4.6 The Vendor shall provide parts lists as follows:

- Spare parts and consumables for the first two years of operation.

- Parts and consumables for a combustion inspection.

- Parts and consumables for a hot gas path inspection.

- Parts and consumables for a major inspection.

- Major components with a life expectancy less than 20 years. [i.e., turbine

nozzles (if applicable), blades, combustion liners and transition pieces (if

applicable), rotors (if applicable), compressor blades, inlet guide vanes, inlet

and exhaust ducts, expansion gaskets, inlet and exhaust silencers, lube oil

coolers, motors, pumps, gears, etc.]

4.7 The Vendor shall provide a list of the equipment requiring emergency power.

5 Design

5.1 General

5.1.1 Mechanical drive gas turbine packages shall comply with API STD

616, fourth edition. Manufacturer's standard design is acceptable

provided that it complies with this engineering specification's

requirements, and a list of exceptions to API STD 616 is provided for

review by the Chairman, Gas Turbines & Diesel Engines Standards

Committee, Consulting Services Department.

5.1.2 If applicable, the auxiliary gearbox shall be of the manufacturer's

standard design which has been proven in either an identical or at

minimum in a similarly loaded and operated unit.

5.1.3 The proposed gas turbine unit auxiliary systems shall be suitable for

both the lowest and highest site ambient temperatures.

5.2 Enclosures

5.2.1 For outdoor operation, the gas turbine shall be packaged in an

enclosure. For indoor operation, the gas turbine shall be either in an




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enclosure or free standing. The Vendor shall provide, on the Data

Sheet, the heat rejection rate from the unit to the building.

5.2.2 Maintenance provisions and equipment for lifting the heaviest gas

turbine components shall be provided (e.g., overhead cranes lifting

beams and cranes inside accessory compartments).

5.2.3 Removable sections in the lagging shall be furnished to facilitate

access and removal of compressor upper half casing, combustors and

the turbine section casing.

5.2.4 All lighting within the local control compartments and walk-in type

enclosures shall be furnished and installed. Installation shall be in

accordance with NEC or IEC.

5.2.5 A ventilating purge air system shall be provided for the accessory

compartment, gas turbine compartment and purged exhaust stack,

where applicable. This ventilation air shall be taken from the clean air

plenum of the inlet air filter housing. The system shall have an

installed spare motor driven fan.

5.2.6 All doors shall be equipped with panic bars.

5.3 Compressor

5.3.1 When possible, the Vendor shall provide the option for coated

compressor stage if the coating is not standard. This information shall

be submitted through the Company or Buyer Representative for review

by the Chairman, Gas Turbines & Diesel Engines Standards


5.3.2 The unit shall be equipped with a compressor off-line and on-line

washing systems. The manufacturer shall provide instructions for both

off-line and on-line washing and shall list allowable cleaning

detergents/chemical and recommended washing frequencies and

instrumentation to be disconnected during the wash cycle.

A manual drain valve shall be provided at the lowest point of the

compressor casing. The drain line shall be piped and flanged to skid

edge.

5.3.3 The starting device shall be used to crank the compressor rotor for off-

line washing.

5.3.4 The unit control shall include a drying cycle which can be selected by

the operator to start the unit after off-line washing.




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5.4 Combustor

5.4.1 The Manufacturer shall provide allowable variation of the Wobbe

Index for the gaseous fuel(s) specified in the data sheet.

5.4.2 An automatic drain valve shall be provided at the lowest point of the

combustion casing to drain any liquid that may enter the combustion

casing when the unit is shut down. A manual valve shall also be

provided in the drain line, downstream of the automatic valve, at an

easily accessible location. The drain line shall piped and flanged to

skid edge.

5.5 Turbine

5.5.1 The turbine shall be capable of a hot restart at any time after a trip. If

this cannot be achieved, the Vendor shall specify the pre-cooling

interval between start attempts required by the turbine under any

operating conditions, and shall be supplied for review and approval by

the Chairman, Gas Turbines & Diesel Engines Standards Committee,

Consulting Services Department. This pre-cooling interval should be

part of the re-start logic of the control system.

5.5.2 When crude oil is used as fuel, the unit turbine section shall be

equipped with off-line washing system. The manufacturer shall

provide complete washing instructions and recommended washing

frequencies.

5.5.3 If heat exchangers are used to cool the turbine cooling air, then an

installed spare shall be provided (e.g., 2x100%,1x100% with 3x50%

fans). The heat exchanger design shall comply to section 5.9 of this

SAMSS.

5.6 Inlet Air System

5.6.1 The inlet air system, up to and including the inlet plenum, shall be in

accordance with 32-SAMSS-008. The filtration system shall be a self

cleaning type.

5.6.2 A manometer or pressure sensor readout shall be provided at the

turbine inlet flange, with connection to the turbine control.

5.6.3 The inlet silencers shall be corrosion resistant Manufacturer's standard

design. If coating is used, it shall be zinc free.

5.6.4 A bulkhead double lock type gasket-sealed access panel or bolted

manhole shall be provided to access the interior of the plenum





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5.6.5 Two safety glass viewing window, one on each side of the inlet

plenum, shall be provided as per manufacturer's standard design. The

height of the viewing window shall not exceed 1.6m above grade,

platform, or walkway.

5.6.6 The inlet plenum and the inlet duct shall have drain pipes installed in

all low points. The bottom of the inlet plenum shall slope away from

the compressor inlet flange towards the drains. A slope of 3/1000 to

5/1000 is acceptable. The drain pipe diameter shall be 25 mm (1 in)

minimum, and 50 mm (2 in) minimum for units with evaporative

coolers. The drains shall slope downwards continuously and shall be

connected to a common trap fitted with an automatic drain valve.

Failure of the automatic drain valve shall be indicated by an alarm.

The drain system shall be configured such that the maximum liquid

level shall not be less than 250 mm (10 in) below the bottom of the

inlet plenum.

The drain system shall be air tight. In areas where rain can enter the

inlet air system, a water droplet catcher shall be installed.

5.6.7 Drain holes open to atmosphere in the plenum low points are not

acceptable.

5.7 Exhaust System

5.7.1 The discharge of the gas turbine exhaust gases shall be outside of a

three-dimensional fire hazardous zone.

5.7.2 The exhaust stack discharge shall be at least 3 m higher than any

platform or access within a horizontal distance of 7.5 m.

5.7.3 The exhaust stack shall discharge outside any classified electrical area.

5.7.4 The turbine exhaust stack external surface temperature shall not exceed

230°C to a height of ten (10) feet above grade and platforms.

5.7.5 Where personnel protection and/or reduction of heat rejection are

required, external insulation shall be installed on any surface up to ten

(10) feet above grade, walkways, and platforms. The exposed surface

temperature shall not exceed 70°C.

5.7.6 The exhaust duct and expansion joints shall be provided by the

Vendor.

5.7.7 A pressure indicator shall be provided at the turbine exhaust plenum.




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5.7.8 The exhaust plenum and the exhaust silencers shall be Manufacturer's

standard. The exhaust plenum shall be provided with an access

manhole (i.e., between the exhaust diffuser and silencers) at grade level

or access platform if located above grade. The turbine Manufacturer

shall also supply any required extensions to the supporting structure

and safety provisions for personnel protection.

5.7.9 Emission sampling ports shall be according to referenced USEPA

Method 1, Section 2.5, 40 CFR 60. Emissions sampling ports are also

possible after the diffuser in the vertical plane.

5.8 Couplings

5.8.1 All couplings shall be of the dry, flexible diaphragm or disc type. If

the load is higher than the capability of flexible couplings, solid

couplings may be provided.

5.8.2 For mechanical drive units, the Vendor shall offer, as optional, a torque

metering load coupling designed for continuous operation. The

coupling monitor display shall include torque, speed and power. Strain

gauge type couplings are not acceptable.

5.9 Fuel System

5.9.1 The proposed gas turbine unit shall be designed to operate on the

primary and backup fuels.

5.9.2 For gaseous fuels, the proposed unit shall be capable of handling the

fuels specified in the data sheets without requiring any hardware or

software modifications.

5.9.3 The on-skid fuel gas piping shall be SS 316L and of the manufacturer's

proven standard design. In addition, all fuel piping welds shall be

subjected to 100% inspection (radiography, magnetic particle, dye-

penetrate). If sour gas is used as fuel, then fuel gas piping shall be in

compliance with NACE MR0175, 2002 Edition.

5.9.4 Strainer

A fuel gas strainer with a differential pressure gauge shall be provided

loose to be installed upstream of the gas supply connection to the

turbine fuel delivery interface flange. The internals of this strainer

shall be corrosion resistant stainless steel.

5.9.5 For liquid fuel burning unit, the extent and method of liquid fuel

treatment shall be determined for each project individually and shall




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depend on the fuel quality (grade) and the requirements of individual

turbine make and type. Proposals by the Vendor for burning liquid

fuel shall detail the fuel specification treatment required. Proposals

shall be submitted through the Company or Buyer Representative for

review and approval by the Chairman, Gas Turbines & Diesel Engines

Standards Committee, Consulting Services Department.

5.10 Lube Oil and Hydraulic Oil Systems

5.10.1 General

5.10.1.1 The lube oil system shall comply with API STD 614 latest

revision, for mechanical drive, and with ASME B31.1 for

power generation units. The system shall also comply with

the requirements noted in this specification. The list of

deviations, where applicable, to this Specification shall be

submitted for review by the Chairman, Gas Turbines &

Diesel Engines Standards Committee, Consulting Services

Department.

5.10.1.2 If the lube oil system is custom designed (not the

Manufacturer's standard construction), it shall be sized to

handle both the turbine and the driven equipment. Also,

when space limitation exists, as may be the case on an

offshore production facility, a combined lube oil system

shall be specified. The custom design lube oil system shall

comply with Chapter 1 & 2 of API STD 614, Fourth

Edition, and the requirements noted in this specification.

5.10.1.3 Provisions shall be made for bypassing the bearings of the

unit and driven equipment during lube oil system flushing.

5.10.1.4 The hydraulic oil system, if applicable, shall be of the

manufacturer's proven standard design.

5.10.2 Lube Oil Reservoir

5.10.2.1 The location of the lube oil reservoir shall be in accordance

with the Manufacturer's standard construction. If the lube

oil system is to be custom designed, the reservoir shall be

separate from the turbine baseplate.

5.10.2.2 The reservoir retention time shall be in accordance with the

Manufacturer’s standard design, but not less than 5 minutes,

based on normal flow and retention capacity.




Page 14 of 35

5.10.2.3 The reservoir shall be either stainless steel or internally

coated carbon steel. However, welding to the oil tank is not

permitted if the tank has already been coated.

5.10.2.4 Lube oil return flow may enter the oil tank below the

nominal oil level, provided that no foaming takes place and

it is the Manufacturer's standard method, and is supported

by extensive field experience with satisfactorily continuous

service of at least one year.

Features to minimize the potential of oil foaming shall be

part of such set up. Information pertaining to oil tank

material, coating and oil return flow setup shall be

submitted by the Manufacturer through the Buyer or

Company Representative for information to the Chairman,

Gas Turbines & Diesel Engines Standards Committee,

Consulting Services Department.

5.10.3 Lube Oil Coolers

Lube oil coolers shall be of the manufacturer's proven standard design

for the site condition (e.g., marine, desert, etc.), with the following

exceptions and additions:

5.10.3.1 An installed spare shall be provided (e.g., 2x100%,1x100%

with 3x50% fans).

5.10.3.2 Oil-to-water coolers shall be provided with air venting

feature on water side.

5.10.3.3 Fin fan coolers shall be provided with 316L stainless steel

material tubes and heads. All other coolers’ material of

construction shall be submitted for approval to the

Chairman, Gas Turbines & Diesel Engines Standards


5.10.3.4 Brush (wire mesh) type turbulators for cooler internals are

not acceptable.

5.10.3.5 The minimum cooler design airside fouling resistance shall

be 0.000352 m² °K/W (0.002 ft² h °F/Btu).

5.10.3.6 The minimum cooler design inlet air temperature shall be

the summer dry bulb temperature at 1.0% plus 4.4°C (8°F).

5.10.3.7 U-bends in air coolers are not allowed




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5.10.3.7 The vendor shall advise the Buyer of the cooled oil

temperature achievable under specified maximum ambient

temperature conditions. In no case shall the lube or seal oil

temperature downstream of the cooler exceed 60˚C (140˚F).

5.10.3.8 The lube oil cooler fan motors shall be equipped with

siezmic vibration probs.

5.10.4 Lube Oil Filters

5.10.4.1 Dual lube oil filters shall be provided. The filter elements

shall be of the disposable cartridge type.

5.10.4.2 Lube oil filter switchover valves shall be provided, and

shall only switchover between the filters. Valves

removal/reinstallation for maintenance shall not require

cutting/welding.

5.10.4.3 Lube oil filter switchover during operation shall not affect

the unit operation.

5.10.4.4 Differential pressure device across the filter shall be

provided with an alarm.

5.10.5 Lube Oil System Piping

The lube oil system supply piping, downstream of and including the

lube oil filters, shall be 316L Stainless Steel or better. Carbon steel

valves with stainless steel trim are acceptable.

5.11 Piping and Tubing (General)

5.11.1 All threaded process connections shall be tapered per ASME B1.21.1.

5.11.2 All flanged process connections shall conform to ASME B16.5.

5.11.3 Flexible hoses/piping shall be with integral connectors.

5.12 Starting System

5.12.1 The type of starting system shall be as specified in the datasheets.

5.12.2 Starting system associated diesel engines, electric motors, and steam

turbines shall be of the manufacturer's proven standard design. The

starter steam turbine shall be equipped with its own overspeed

protection system.




Page 16 of 35

5.12.3 The starting system shall be of the manufacturer's proven design, but

capable of a minimum of three consecutive start attempts. The Vendor

shall specify waiting periods required between starts for recovery of

the starting system for various operating conditions.

5.12.4 For mechanical drives, the torque curve of the driven equipment shall

be obtained from its supplier. As a minimum, the torque curve shall be

provided from zero speed to self-sustaining speed of the train.

5.12.5 If black start capability is specified, the starting device shall be a diesel

engine or an electric motor fed from a dedicated diesel generator

supplied by Buyer.

5.13 Controls and Instrumentation

5.13.1 Gas Turbine Control System (TCS) shall be of the manufacturer's

standard design. Third party control systems may be allowed only if

the gas turbine manufacturer does not offer its own control system.

5.13.2 The control system shall be electronic, microprocessor based, and fully

redundant. Wherever feasible, a single control system for both the

CGT and driven equipment is desired.

5.13.3 The turbine control function shall include starting, operating, stopping,

protecting, monitoring and cleaning (on-line and off-line) of the gas

turbine unit.

5.13.4 The control system shall be installed in an air conditioned cabin

located in the vicinity of the unit. The control cabin shall be as per

paragraph 5.18 of this SAMSS.

5.13.5 The starting cycle sequence shall be automatic, unless otherwise

specified. The operator shall be able to pause the start up cycle at

certain safe steps (e.g., system check, purging, idle) and return to a

previous step in the start up cycle (one at a time) without subjecting

the unit to any damage or unsafe operation. The operator shall also be

able to abort the start up at any point during the start up cycle.

5.13.6 The control system shall provide a purge period to displace three to

five times the entire volume of the gas turbine and the inlet and

exhaust systems, before firing the unit.

5.13.7 The control system shall have an independent Uninterrupted Power

Supply (UPS) capable of supplying power sufficient to achieve a safe

and orderly unit shutdown. The UPS shall be of manufacturer's

standard on-line type.




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5.13.8 Radio Frequency Interference (RFI), from sources such as hand-held

radio transceivers operating at 5 watts within the frequency ranges ,

50-174 MHz, 406-470 MHz, and 800-870 MHz, and held at a distance

of 1.0 meter from the control equipment shall not cause any

malfunction, data corruption or damage to the turbine control

equipment.

5.13.9 For generator drive gas turbines, the speed governor system shall be

capable of adjusting through a range of plus/minus 4% of synchronous

speed before synchronization.

5.13.10 For generator drive gas turbines operating in an isolated island mode

and are under load, the governor shall regulate the speed within

plus/minus 4% droop when going from half load to full load.

5.13.11 The proposal shall contain a statement of the permissible maximum

value of the steady state speed regulation for which the speed

governing system may be adjusted.

5.13.12 Power generating units shall be capable of maintaining the load despite

a sudden loss of the parallel or back up power supply (e.g., supplied

from a national electric power grid). The units shall also have the

capability and facility to synchronize back with the grid power supply

while it is carrying the connected load.

Commentary Note:

The intent of 5.13.12 is to assure that the GT will be able to supply the required power if the main grid power supply is disconnected for whatever reason, without any limitations imposed on plant's operation.

5.13.13 For heavy industrial units, vibration measurement and monitoring shall

be provided on all bearings. The following instrumentation shall be

provided:

- One event per revolution sensor (key phasor) on each shaft.

- Journal bearings shall have radial shaft relative displacement

sensors (X-Y probes) mounted at 45° from the vertical centerline.

- Bearing housings shall have a piezo-velocity seismic transducer

displaying vertical velocity in RMS.

- The thrust bearings shall have dual probes with voting logic

monitoring the axial position.

- For probes requiring cooling, the Vendor shall specify the cooling

air quantity and quality.




Page 18 of 35

Installation and calibration shall be in accordance with 34-SAMSS-625.

5.13.14 For aero-derivative engines, vibration measurement and monitoring

shall be per the Vendor's standard. A minimum of two transducers are

required, one on the compressor casing and one on the turbine casing.

Both transducers shall be used for alarm and emergency shutdown.

Installation shall be in accordance with 34-SAMSS-625.

The driven equipment shall be equipped with a minimum of a

keyphasor, and proximity probes measuring radial and axial directions

on each bearing housing, as applicable.

5.13.15 For heavy industrial units, bearing lube oil drain thermocouples or

RTD shall be provided for every bearing. One common thermocouple

in a combined drain is not acceptable, except for bearings with

common cavities. Hydrodynamic thrust and radial bearings shall each

have either an RTD or a thermocouple installed in a pad that is

expected to read the highest temperature. Lube oil drain

thermocouples shall be utilized for alarm and emergency shutdown.

Installation shall be in accordance with 34-SAMSS-625.

5.13.16 The speed sensor shall be either of magnetic or inductive pick-up type.

5.13.17 For turbines equipped with rolling element bearings, on-line metal chip

detection instrumentation shall be provided in each bearing lube oil

drain line. Annunciation of detected chips or debris shall be provided

in the plant control room.

5.13.18 The instrumentation system shall comply with the electrical area

classification requirements designated in the Purchase Order or on the

approved electrical area classification drawing.

5.13.19 The arrangement, grouping and number of panels for instrumentation

shall be in accordance with the Manufacturer's standard.

5.13.20 The control system shall have a redundant connection, MODBUS or

Ethernet, with the Human Machine Interfacte (HMI) and with the plant

Distributed Control System (DCS).

5.13.21 Alarm and shutdown systems shall be of fail-safe design.

5.13.22 Control system cabinets shall be rigid, self-supporting and made of

metal.

5.13.23 Cabinets requiring heat dissipation shall be convection-ventilated and

provided with readily accessible, removable filter screens inserted







Page 19 of 35

behind slotted louver inlets. Louvers and filters installed within cabinet

doors are acceptable. If fans are used to assist in heat removal and are

required to dissipate heat when the HVAC is running, redundant fans

shall be provided.

5.13.24 Interiors of floor-mounted digital cabinets containing power supplies

shall be monitored by an addressable high-sensitivity air sampling or

point-type smoke detection system. The detection systems shall have

at least two adjustable set points. All sensing devices shall be

addressable to the local fire panel. Each cabinet requires an

individually identifiable smoke detection end device so that the fire

panel will identify which specific cabinet is generating the alarm.

Air sampling tubes or pipes for high sensitivity smoke detection

systems shall be steel or otherwise have a flame spread rating not over

25 without evidence of continued progressive combustion and a smoke

developed rating no higher than 50 or otherwise be UL listed

specifically for air sampling smoke detector service. Use of unrated

PVC pipe or tubing is not allowed.

5.13.25 The instrument piping and tubing materials and installation shall

ensure the reliable and accurate operation in the working environment

of the instrument(s) involved, and allow sufficient access for

maintenance, calibration and testing.

5.13.26 Instrument tubing shall be adequately supported to eliminate any

vibration transmission to the instruments or excessive load to the

piping connection.

5.13.27 Each instruments tubing shall be equipped with block valve (root

valve) for isolation and maintenance of the associated instrument only.

5.13.28 instrument enclosures shall be stainless steel or copper free aluminum

and shall be rated as NEMA 4X or IEC Type IP 65.

5.13.29 all shutdown initiating devices shall be redundant.

5.13.30 Emergency shutdown buttons shall be provided on both sides outside

of the gas turbine enclosure. Buttons shall be of the pull type not push

type.

5.14 Wiring

5.14.1 General power wiring, for circuits up to 600V to ground and a

maximum current rating of 15A, shall be stranded copper; flame

retardant PVC, XLPE or XLPO insulated; size 14 AWG minimum;




Page 20 of 35

have an insulation minimum temperature rating of 90°C and shall

comply with NFPA 70 or IEC 60502-1.

5.14.2 Instrumentation signal wiring shall be stranded copper; flame retardant

PVC, XLPE or XLPO insulated. The minimum wire size shall be:

a) 16 AWG single twisted pair/triad from instruments to the nearest

skid mounted junction box. Cables carrying analog signals shall

also be shielded. Smaller wire size may be accepted if

substantiated by field experience and a written approval is

obtained from the Chairman, Gas Turbines & Diesel Engines

Standards Committee, Consulting Services Department.

b) 18 AWG for multi-twisted pair/triad cables from junction boxes

to other junction boxes, marshalling cabinets, or control system.

c) 22 AWG for multi-conductor cable inter-cabinet wiring.

5.14.3 Pair/triads of multi-twisted pair/triad control cables shall be numbered.

5.14.4 Except for thermocouple wiring,

a) Power and signal wiring shall be color coded as follows:

AC Supply: DC Supply Signal Pair Signal Triad

Phase – Black Positive – Red or

red sleeve over any color except green

Positive – Black Positive – Black

Neutral – White

Negative – Black or black sleeve over any color except

green

Negative – White Negative – White

Ground – Green or green with yellow trace

- - Third Wire – Red

b) Thermocouples shall be as per ANSI MC96.1.

c) Blue color insulation or jacket shall only be used for intrinsically

safe installation.

5.14.5 Splices are not permitted in wiring. When wiring must be extended,

connections shall be made via terminal blocks.

5.14.6 Wiring connections shall be made to channel (rail) mounted terminal

blocks. These terminal blocks shall have tubular box clamp connector

and compression bar or yoke for wire termination. More than two

connections per terminal point are not allowed.




Page 21 of 35

5.14.7 Fused terminals shall be used for power distribution, alarm, and

shutdown systems.

5.14.8 Double Block and bleed arrangement for each one of the instruments,

grouped in the 2 out of 3 shutdown logic, shall be provided to enable

maintenance while the unit is in operation

5.14.9 Different instruments signals shall be segregated from each other and

from power wiring.

5.14.10 Cables may be routed utilizing one of two methods:

5.14.10.1 Instrument cables may be routed in conduits. The conduit

installation shall be in accordance with NFPA 70.

5.14.10.2 Armored cables may be routed on trays. For this option, the

following guidelines shall be followed:

a) The armored cable shall be suitable for the area

classification where the packaged unit is installed

(e.g., ITC, PLTC, MC, etc.).

b) The armored cables shall be routed on aluminum or

stainless channel trays. Galvanized steel trays are not

acceptable.

c) The cable armor shall be either steel wire armor or

interlocked metallic armor.

d) The trays shall be elevated and shall not be mounted

to the skid base plate unless protected by grating.

e) Tray ends are bent to avoid having sharp edges.

f) The glands at both ends of the armored cable shall be

certified flameproof (EExd) gland. Where sealing is

required by NFPA 70, the gland shall be certified

(EExd) with a compound barrier seal (e.g., CMP

Protex 2000 - PX2K).

5.14.11 JB shall be 316 series SS and be IEC 60529 type IP66 or NEMA

250/NEMA ICS type 4X and shall meet the segregation requirements

of paragraph 5.18.9.

5.14.12 Instruments and JBs shall have permanently attached engraved

phoenolic / laminate or plastic nameplates, showing tag numbers.

Phoenolic nameplates shall be installed with two stainless steel screws.




Page 22 of 35

5.14.13 All packaged unit wiring, intended for interface with plant wiring

and/or control package, shall be terminated in junction boxes.

5.14.14 Interconnecting wires between skid mounted components, between

skid mounted instruments and the skid termination panel, and between

skid termination panels and control system panels shall be tagged.

Each tag shall identify the device to which the opposite end of the wire

is connected. Heat shrink or ferrule type wire tags with permanently

embossed identification markings shall be used.

5.15 Electrical System

5.15.1 The electrical equipment shall comply with the electrical area

classification requirements designated in the Purchase Order or on the

approved electrical area classification drawing.

5.15.2 Batteries

5.15.2.1 Batteries supplying power for the DC auxiliary system and

turbine control power shall be located in a separate

ventilated building or compartment, adjacent to the turbine

control compartment in accordance to paragraph 5.18.7.

5.15.2.2 Batteries shall be suitable for site conditions and sized by

the GT Vendor to ensure proper operation and safe GT unit

shutdown.

5.15.2.3 The batteries shall be of the industrial type and capable of

supplying the required stand by power for at least ten (10)

continuous hours.

5.15.2.4 Vendor provided batteries and battery chargers shall be of

the manufacturer's proven standard design. Valve regulated

batteries are subject to pre-approval by the Chairman, Gas

Turbines & Diesel Engines Standards Committee,

Consulting Services Department. The vendor shall

demonstrate prior experience.

5.15.3 Provision for grounding the skid structure shall be made at diagonally

opposite corners. The skid structure shall be designed to accommodate

two-hole compression connector, for (2/0 AWG) copper conductor, at

each corner.

5.15.4 Motors




Page 23 of 35

5.12.4.1 Name plate rating for 480V and 4160V power supply shall

be 460V and 4000V respectively.

5.12.4.2 Motors shall meet the criteria for class F insulation, with an

allowable temperature rise, above ambient temperature of

50°C (122°F), to not exceed that listed for Class B.

5.16 Protection Systems

The combustion gas turbine unit shall be provided with the following protection

systems.

5.16.1 Overspeed Protection

5.16.1.1 The overspeed system shall have redundancy. A minimum

of one electric (electronic) and one mechanical trip devices

per shaft shall be provided.

5.16.1.2 A totally electronic system may be accepted, however, a

fully redundant system with three shaft probes and two out

of three voting logic shall be provided.

5.16.1.3 For multiple shaft units, each shaft shall have its own

overspeed trip protection.

5.16.1.4 The trip system shall allow on-line testing without

overspeeding the turbine (simulation).

5.16.1.5 A load coupling failure shall not result in a turbine speed

increase beyond the specified overspeed limit.

5.16.1.6 Alarm and trip speeds shall be specified by the Manufacturer.

5.16.2 Over-Temperature Protection

5.16.2.1 A minimum of six thermocouples shall be placed

circumferentially in the turbine exhaust gas stream to

measure exhaust gas temperatures. Alarm and trip

temperature settings for the average and spread exhaust

temperatures from the thermocouples shall be provided by

the Vendor.

5.16.2.2 Over temperature protection may use the same

thermocouples instrumentation used for the turbine

temperature control.




Page 24 of 35

5.16.2.3 Heavy industrial turbines shall have a minimum of two

thermocouples for each turbine disk cavity, where feasible.

Alarm settings for the maximum allowable disk cavity

temperatures shall be provided by the Vendor.

5.16.2.4 Aero-derivative engines shall have, as a minimum, two disk

cavity thermocouples downstream of the last turbine wheel.

5.16.3 Fire Protection

5.16.3.1 The fire detection and fighting systems shall be in

accordance to NFPA 72 and NFPA 12, respectively.

Additional means of detection, such as optical, are

acceptable. The fire protection system shall provide

coverage to the gas turbine and the driven load enclosures

(e.g., the generator enclosure, if Vendor's standard). The

protection system shall consist of a fire detection system,

fire suppression system, and for gas fueled units, a gas

detection system.

5.16.3.2 The fire extinguishing medium shall be Carbon Dioxide

(CO2). Carbon dioxide cylinders shall be stored in a

separate cabinet for outdoor applications, close to the

turbine. A device to determine if the cylinders are full shall

be supplied. A common one 100% uninstalled spare agent

cylinders shall be provided per site.

5.16.3.3 Audible and visual warning devices shall be installed inside

and outside, two each side of the GT walk-in enclosure, to

be activated 30 seconds prior to any discharge of CO2 into

the area.

5.16.3.4 The color-coding for the CO2 pre-discharge visual alarms or

beacons shall have a different distinctive color than that for

gas detection.

5.16.3.5 Lock-out devices to disarm the CO2 system when personnel

are present shall be installed unless the omission is

approved by the Chief Fire Prevention Engineer. The

control system shall display an alarm indicating a disabled

firefighting system when it is locked out.

5.16.3.6 Air-moving power and fire dampers in the ventilation

system shall shutdown upon system actuation.




Page 25 of 35

5.16.3.7 Appropriate warning signs shall be affixed in noticeable

locations inside/outside all protected CGT's compartments

and outside each entrance to CO2 cylinders storage room in

accordance with NFPA 12.

5.16.4 Gas and Hydrogen Sulfide Detection System:

5.16.4.1 Gas detection system inside the gas turbine compartment

shall be provided. Manufacturer's standard detectors are

acceptable with the exception of electrochemical detectors.

Set points shall be per the Manufacturers' standard, but in

no case shall be higher than the following levels:

Critical (High-high) alarm 50% Lower Explosive Limit (LEL)

Warning (High) alarm 25% Lower Explosive Limit (LEL)

5.16.4.2 If sour gas is used as the primary or the alternate fuel, H2S

detectors shall be installed in addition to the combustible

gas detectors. Set points shall be per manufacturers'

standard, but in no case shall be higher than the following

levels:

Critical (High-high) alarm 50 PPM Hydrogen Sulfide

Warning (High) alarm 20 PPM Hydrogen Sulfide

5.16.4.3 The gas and hydrogen sulfide detection system shall be

capable of initiating a gas turbine unit trip using a two out

of two voting system logic.

5.16.4.4 When heavy fuel gas is used, proper ventilation and gas

detectors shall be installed to facilitate gas detection and

discharge in case of a leak.

5.16.4.5 Audible and visual gas and Hydrogen Sulfide, when

applicable, detection alarms shall be installed outside of the

turbine compartment on each side. The length of the

complete train shall be considered to define the number and

locations of the alarms to ensure proper area coverage.

5.16.4.5 H2S and LEL beacon colors shall be blue and red

respectively.




Page 26 of 35

5.17 Emissions

5.17.1 Equipment noise levels shall be less than 85 dB(A) at a distance of one

meter from the unit at 1.5 meter height above ground. The Vendor

shall advise whether acoustic treatment will be required to meet this

noise requirement. The need for acoustic treatment shall be

determined after review of the plant requirements.

5.17.2 Acceptable exceptions to noise limits in 5.17.1 include those emitting

from the unit inlet filtration air-pulse system, by-pass operations,

bleed-valves, unit trips, start/shut down, transitory conditions, fuel

switch-over, no load condition, areas within enclosures, emergency

sirens, alarms, and loudspeakers.

5.17.3 Exhaust Emission levels for the full expected operating range shall be

provided for the proposed gas turbine units. Emission levels shall not

exceed the limits specified in the table below across the full operating

range identified in the data sheets or the Purchase Order.

Combustion Gas Turbines (CGTs)

Emission Requirements for Proposed Unit Primary Fuel

Within The Royal

Commission Areas Refer to the Royal Commission environmental standards

Outside The Royal

Commission Areas

Nitrogen Oxides (NOx)

@ 15% O2 <60 ppmvd

Sulfur Dioxide (SO2)

Any emission control will be

based on Ambient Air Quality

Surveillance (AAQS) compliance

5.17.4 The proposed gas turbine low emission system shall have been

performing satisfactorily in continuous service for a minimum of two

(2) years in at least two units similar to the proposed one.

5.17.5 The vendor shall be responsible for final tuning to the agreed emission

levels, start up, and commissioning of the emission controlled systems

for the total operating range of the unit.

5.17.6 Steam or water injection for emission control is not acceptable.

5.18 Control Cab

5.18.1 The cab shall be positively pressurized and equipped with 2x100%

fully segregated HVAC and pressurizing systems.




Page 27 of 35

5.18.2 False ceilings shall not be used in the control cab.

5.18.3 All requirements stated in this SAMSS shall apply on the control cab

(e.g., electrical installation, wiring).

5.18.4 The control cab shall be made of non-combustible contruction and

finishing.

5.18.5 Smoke detectors, two below the floor and two to the ceiling, shall be

installed per NFPA requirements.

5.18.6 The control cab shall be grounded.

5.18.7 All doors shall be equipped with panic bars..

5.18.8 Battery Rooms

5.18.8.1 Flooded type batteries shall be installed in concrete

construction room in accordance with Saudi Aramco

Engineering Standards (SAES) and requirements (e.g., eye

wash, safety equipments, etc.).

5.18.8.2 Regulated Valve Batteries (VRLA) shall be placed in a

separate room. It shall be in accordance with the control

cab requirements of this SAMSS and the following:

5.18.8.2.1 Battery room floor shall be covered with an

electrolyte (acid or alkali) resistant, durable,

antistatic and slip-resistant surface overall, to a

height 100 mm on each wall.

5.18.8.2.2 Battery rooms shall be provided with an

addressable spot-type smoke detection system.

5.18.8.2.3 Battery rooms shall be vented to the outside air

by forced ventilation to prevent accumulation

of hydrogen. The ventilation system is

determined such that the hydrogen

concentration shall be limited to less than 1% of

the total air volume of the battery room.

5.18.8.2.4 The ventilation system shall be 100% redundant

and based on one complete air change every

three (3) hours. Only direct driven exhaust fans

shall be used.




Page 28 of 35

5.18.8.2.5 Air-pressure measuring device, such that

ventilation insufficient to the 1% hydrogen

limit will cause the high-rate charge to stop and

alarm is displayed in the control system.

5.18.8.2.6 Doors shall open outward toward the outside of

the cab and fitted with door closers. Doors

between battery room and other rooms are not

permitted.

5.18.8.2.7 Inlets of air-conditioning shall be no higher

than the top of the battery cell and the outlets

(exhaust) at the highest level in the room.

Return air-conditioning ducts from battery

rooms shall be prohibited.

5.18.8.2.8 Working space of at least 1 meter shall be

provided in front of each battery rack.

5.18.8.2.9 Lighting fixtures shall be vapor tight and

installed at least 300 mm below the finished

ceiling to allow hydrogen dispersion past the

fixture.

5.19 Baseplates

5.19.1 A baseplate shall be required on all packaged units. A single baseplate

to accommodate the turbine, accessory and auxiliary equipment, driven

equipment, gear unit, lube oil system, and instrumentation panels is

preferred. However, baseplates over 12 m (40 ft) long may be split

into bolted and doweled sections to be assembled at the site.

Soleplates are acceptable only for very large gas turbine units which

must be shipped in sections for site assembly.

5.19.2 The Vendor shall provide the necessary features or material for

equipment leveling, including leveling shims if required. The leveling

material shall be 316L Stainless Steel. If shims are required, the

Vendor shall provide packs 3 mm to 13 mm (0.125 in to 0.5 in) thick.

5.19.3 Vent and drain piping and valves, manifolded and brought to a skid

edge flange RF type in accordance with ASME B16.5 specification.

5.20 Access Structure




Page 29 of 35

5.20.1 Grating shall be in accordance with PIP STF05530. Railings shall be

in accordance with PIP STF05520 and STF05521. Stairs shall be in

accordance with PIP STF05511.

5.20.2 Ladders and cages shall be in accordance with PIP STF05501.

However, fixed ladders shall be of the side step design, except on tanks

under 3 meters high where step-through ladders may be used.

5.20.3 The above mentioned PIPs may give solutions to certain types, if such

a case is encountered, the type and its solution shall be followed.

5.21 Structures

5.21.1 All structural and supporting materials, except ASTM A193, ASTM

A194, ASTM A490 or ASTM A490M bolts, and crane rails, shall be

galvanized, unless painting is specified in the Contract Documents.

Steel embedded in concrete (including ASTM A36, ASTM A307 and

ASTM F1554 anchor bolts) shall be hot-dip galvanized. Zinc plating

is not acceptable.

5.21.2 Galvanizing of steel shapes, washers, plates and hardware shall be in

accordance with the following ASTM specifications:

a) Steel shapes and plates - ASTM A123

b) ASTM A325 Type 1 or ASTM A325M Type 1 bolts and

corresponding nuts and washers -ASTM B695 (or ASTM A153 /

ASTM A153M when approved by the Buyer)

c) ASTM A36 / ASTM A36M threaded bar or ASTM A307 bolts

and corresponding nuts and washers - ASTM A153 / ASTM

A153M or ASTM B695

d) All bolts, nuts, and washers shall meet required mechanical

properties after galvanizing.

5.22 Anchor Bolts

5.22.1 Anchor bolts shall be in compliance with Standard Drawing

AB-036322 (The AB-036322 requirement of SAES-Q-005 shall be

considered inapplicable for anchor bolts). It is the responsibility of the

foundation design engineer to verify the capacity of any vendor

furnished or detailed anchor bolts.

5.22.2 Equipment shall be installed on mounting plate(s), and the direct

attachment of equipment feet to the foundation using the anchor bolts





Page 30 of 35

shall not be permitted. Mounting plates shall be of sufficient strength

and rigidity to transfer the applied forces to the foundation.

5.22.3 Anchor bolts and embedded items shall be set accurately, using

templates provided by the equipment manufacturer within the

tolerances specified in the AISC Section 7.5, Code of Standard

Practice, unless specified otherwise on the vendor drawings.

5.22.4 The design of anchor bolts shall be in accordance with the

requirements of Appendix D of ACI 318.

5.22.5 The minimum anchor bolt diameter shall be 20 mm (¾"), except when

specified otherwise by the vendor for small equipment or for the

anchorage of small miscellaneous steel items such as; ladder supports,

small piping supports, handrail anchorage, stair stringers, small

platforms, etc.

5.22.6 Anchor bolts subject to uplift or vibration shall be equipped with an

additional nut to serve as a lock nut, to ensure against loosening.

5.22.7 Minimum clear distance from anchor bolts or anchor bolt sleeves to

edge of concrete shall be 100 mm. Metallic sleeves are not allowed

and anchor bolts shall not be in contact with reinforcing steel.

5.22.8 Anchor bolts shall have 3 mm as a corrosion allowance in addition to

the coating required by the Standard Drawing AB-036322.

5.22.9 Post-installed anchor bolts shall not be used for new construction

without prior written approval. Approval request will only be

considered for chemical anchor bolts that are less than 20 mm (¾")

which are for use as indicted in paragraph 5.22.5. These requests shall

be submitted through the Company or Buyer Representative for review

and approval by the Chairman, Gas Turbines & Diesel Engines

Standards Committee, Consulting Services Department. When

approved for use, the post-installed bolts shall be designed per ACI

318, Appendix D and in strict compliance with the manufacturer's

recommendations.

5.22.10 Unless otherwise specified in the PO, anchor bolts and templates shall

be made available for delivery six months before the first portion of the

first equipment delivery date.

5.23 Dynamics

The turbine Manufacturer shall be responsible for providing a lateral critical

speed and unbalance response analysis for each of the train components, and a





Page 31 of 35

torsional analysis for the complete train. The analysis shall be submitted

through the Company or Buyer Representative for information to the Chairman,

Gas Turbines & Diesel Engines Standards Committee, Consulting Services

Department.

5.24 Materials

Materials of construction of the gas turbine unit shall be Manufacturer's standard

for the specified operating conditions, except as required by this SAMSS, the

Data Sheets or specified in the Purchase Order.

6 Inspection

Inspection during manufacturing shall be in accordance with the Vendor's procedures

with the exception of components required to satisfy special material requirements and

safety procedures detailed in this Specification, the Purchase Order and the minutes of

bid clarification and pre-award meetings. Buyer's inspection of the equipment shall be

in accordance with the Form 175-325501 through 325519, Inspection Requirements,

corresponding to the particular equipment and as specified in the Purchase Order.

7 Testing

7.1 Hydrostatic Tests

The Vendor shall identify in the proposal which components are tested

hydrostatically. Testing, when identified, shall be in accordance with test

procedures and acceptance criteria of API STD 616.

7.2 Mechanical Running Test

7.2.1 The gas turbine unit mechanical running test is required to verify

mechanical integrity, and shall be performed, at the manufacturer's

shop, unless otherwise approved by the Chairman, Gas Turbines &


Department.

7.2.2 Test procedures and acceptance criteria shall be based on API STD 616

for mechanical drive units, and on Manufacturer standard's for power

generating units. The test shall be conducted at full speed and no load

for a minimum of 4 hours total duration, and it should include testing

of the shaft overspeed trip functionality.

The final testing procedure, including Vendor's proposed standard test

procedures and acceptance criteria shall be mutually agreed upon by

Vendor and Buyer and approved by the Chairman, Gas Turbines &






Page 32 of 35


Department.

7.2.3 The Vendor shall provide the results of the mechanical running test.

Dismantling of the unit is required only in the event of an

unsatisfactory test results.

7.3 Electric/Electronic instruments and Control System Tests

7.3.1 Functional test of all electronic instruments after testing for short

circuit, cable continuity, ground insulation with a “megger”, and

ground faults.

7.3.2 Functional test of all electronic control loop verifying a proper

response to simulated input signals. The functional test shall also

include, but not limited to, wiring point to point check, insulation and

dielectric test, earthing check, power destribution check, I/O signals

check and cross signal check, communcation links, sub-system check,

and softwear validation test.

7.4 Emission Test

Source emission testing or stack testing shall be performed on site within 180

days from the date of initial startup. To demonstrate compliance with applicable

source emission requirements, stack tests shall be conducted as per U.S. EPA

recommended methods. Other methods may also be acceptable; however,

approval must be obtained from EPD prior to commencement of the test(s). A

written test report shall be provided to EPD within 60 days thereafter

summarizing the results of the stack test.

7.5 Fire Extinguishing System Test

The CO2 Extinguishing System shall be required to pass a total flooding

performance field test, witnessed by the Chief Fire Prevention Engineer and the

General Supervisor, P&TS Div., Fire Protection Department or their

representatives, prior to mechanical acceptance sign-off. The test shall

demonstrate a full discharge of entire design quantity of CO2 through system

piping to verify that CO2 is discharged into the protected equipment and that the

CO2/O2 concentration is achieved and maintained for the period of time required

by the design specifications, and that all pressure operated devices function as

intended. The commissioning and testing procedures shall be submitted to the

Chief Fire Prevention Engineer or his representative prior to the time of request

to inspect for mechanical completion.

7.6 Sound Level Test




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The noise level test shall be performed on site to meet the requirements of

paragraphs 5.17.1 and 5.17.2. The proponent shall contact EPD to request noise

level testing during the commissioning process, prior to approval of the

Mechanical Completion Certificate (MCC).

7.7 Additional Optional Test

The vendor shall include a proposal for an optional gas turbine performance test

to be considered for inclusion in the Purchase Order per the following criteria:

The machine shall be performance tested on site in accordance with the ASME

PTC 1, ASME PTC 22 (or ASME modified), and ASME PTC 4.4 (COGEN

units). The test procedure shall be agreed upon by the Manufacturer and the

Chairman, Gas Turbines & Diesel Engines Standards Committee, Consulting

Services Department. Test shall demonstrate the guaranteed power and heat rate

for simple cycle units. The test shall also demonstrate the guaranteed exhaust

temperature and flow for cogeneration units.

The turbine manufacturer shall submit a report on the unit site performance

arrangement with all the required details. This report shall include all protective

settings and the necessary curves to define actual site performance.

7.8 Upon the completion of all required tests, the gas turbine rotor(s) shall be axially

and radially locked for shipment. Such arrangement will help in minimizing the

chance of any impact damage on bearings that may result during the on-road

transportation of the gas turbine unit(s).

Revision Summary

1 December 2007 Major revision.




Page 34 of 35

Appendix I – Definitions

Base Load: The Vendor's defined output load that the gas turbine is required to produce at site rated conditions

while achieving an operating life of over 20 years and the OEM recommended Time Between Overhaul (TBO).

Design Condition: The point at which usual operation is expected and optimum efficiency is desired. This point

is usually the point at which the vendor certifies that the heat rate is within the tolerances stated in this

specification. Parameters used to determine the normal operating point including speed, site conditions,

emissions, and fuel composition.

Island Mode Operation: When the gas turbine driven generator(s) is operating alone disconnected from the main

utility grid (SEC).

Life Cycle Cost (LCC): LCC is the equipment Life Cycle Cost analysis to determine cost of equipment

acquisition and operation for a 20 years basis and it typically include: initial equipment cost, maintenance, and

operational costs.

Minimum allowable Temperature: The lowest temperature for which the manufacturer has designed the

equipment (or any part to which the term is referred).

Minimum Site Temperature: The minimum recorded site ambient temperature as identified in the data sheets.

Operating Range: The load and/or speed ranges that the unit is expected to be operated within, at the site

expected conditions.

Overspeed limit: The maximum speed limit that the shaft are permitted to reach safely.

Peak Load: The power output when firing at a temperature above base load firing temperature

as specified by the Manufacturer. Peak load operation capability is intended only for limited or

emergency use.

Summer Dry Bulb Temperature at 1.0% : A dry bulb temperature that has been equaled or

exceeded by 1% (30 hours) of the total hours during the months of June through September.

Site Rated Power: The output shaft power developed by the gas turbine when it is operated at site rated: firing

temperature, speed, inlet air temperature, minimum inlet pressure, auxiliary system losses including inlet and

exhaust duct losses, exhaust pressure, and normal fuel composition. [Net shaft horsepower (HP) for mechanical

drive units, or net generator output in MW for power generation units].

Site Rated Inlet Temperature: The site's ambient temperature as identified in the data sheets, and used for

determining the site rated power.

Site Rated Speed: The rotational speed required by the unit to achieve the Site Rated Power. This speed should

be equal to or close to the normal design speed corresponding to the maximum efficiency point specified by the

Manufacturer.

Site Rated Firing Temperature: The turbine inlet total temperature, measured at a location immediately

upstream of the first-stage turbine nozzles, required to meet site rated power conditions.




Page 35 of 35

Wobbe (gas) Index: The Wobbe index is a gauge of the OEM allowable range of change in heating value. It is

the ratio of the Lower Heating Value (LHV) of the fuel gas divided by the square root of the product of relative

density (with respect to air at ISO conditions) and the absolute temperature, T, of the fuel gas:

5.0)( TG

LHVW

G is gas specific gravity

32-SAMSS-100

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