25652-2000-3PS-H000-V0002-Att004r001v2_0

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Abu Dhabi Oil Refining Company

EQUIPMENT NOISE CONTROL DGS-MU-009Rev-1 May 2009

Takreer DGS-MU-009-Rev-1 May-2009 (Without Addm sheet) Initials Page 1 of 26

EQUIPMENT NOISE CONTROL

Amendment History

1 May 2009 AMD-MU-009-001-BECHTEL SMK /HD

QAM /MAY

May 2009

No Date Amendment Description Proposed Approved Incorporated

DGS History

1 May 2009 DGS-MU-009-Rev-1 AMD-MU-009-001-BECHTEL SMK / HD QAM / MAY

0 Mar 2006 DGS-MU-009-Rev-0 Previous Projects SMK / HD ETSDM / EPDM

No Date Description Source Reviewed Approved

DGS-MU-009-Rev-1

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TABLE OF CONTENTS

1.0 GENERAL ........................................................................................................................... 4 1.1 INTRODUCTION........................................................................................................41.2 PURPOSE..................................................................................................................41.3 DEFINITIONS ............................................................................................................4

2.0 CODES AND STANDARDS ................................................................................................5 3.0 REFERENCE DOCUMENTS ..............................................................................................7 4.0 DOCUMENT PRECEDENCE..............................................................................................7 5.0 SPECIFICATION DEVIATION/CONCESSION CONTROL ................................................. 7 6.0 QUALITY ASSURANCE/QUALITY CONTROL ...................................................................7

7.0 DOCUMENTATION .............................................................................................................7 8.0 SUBCONTRACTORS/SUBVENDORS ...............................................................................8 9.0 ACOUSTICAL DESIGN.......................................................................................................8 10.0 NOISE REQUIREMENTS ...................................................................................................9 11.0 EQUIPMENT SUBJECT TO NOISE CONTROL .................................................................9

11.1 NORMALLY-OPERATING EQUIPMENT.................................................................... 911.2 INTERMITTENTLY-OPERATING EQUIPMENT.......................................................1011.3 EMERGENCY EQUIPMENT.................................................................................... 1011.4 STARTUP EQUIPMENT ..........................................................................................10

12.0 EQUIPMENT NOISE LIMITS ............................................................................................10 12.1 GENERAL ................................................................................................................1012.2 EQUIPMENT NOISE LEVELS ................................................................................. 1112.3 MAXIMUM SOUND PRESSURE LEVELS FOR SPECIFIC EQUIPMENT OR

COMPONENTS .............................................................................................. 1112.4 MAXIMUM SOUND POWER LEVELS FOR EQUIPMENT OR COMPONENTS.....1412.5 NOISE LIMIT INFORMATION COHERENCE ..........................................................14

13.0 ACCEPTABLE AND RECOMMENDED NOISE CONTROL MEASURES.........................14 13.1 LOW-NOISE DESIGNS............................................................................................14 13.2 CORRECTIVE MEASURES AND SILENCING EQUIPMENT .................................15

14.0 CONTRACTOR RESPONSIBILITY...................................................................................19 15.0 VENDOR RESPONSIBILITY.............................................................................................19

15.1 GENERAL ................................................................................................................19 15.2 EQUIPMENT NOISE GUARANTEE ........................................................................20 15.3 NOISE ACCEPTANCE TESTS ................................................................................20

APPENDIX 1............................................................................................................................... 23 EQUIPMENT NOISE DATA SHEET, PAGE 1....................................................................23

EQUIPMENT NOISE DATA SHEET, PAGE 2....................................................................24 APPENDIX 2............................................................................................................................... 25

SILENCER DATA SHEET..................................................................................................25 APPENDIX 3............................................................................................................................... 26

ACOUSTICAL ENCLOSURE DATA SHEET .....................................................................26

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1.0 GENERAL

1.1 INTRODUCTION

This Specification provides details on how to derive maximum allowable noise levels forindividual components, equipment items, or trains, as well as how to measure and reportnoise levels for compliance with the project requirements.

This specification is intended for use in the design and fabrication of the equipment for theProject.

1.2 PURPOSE

This specification is intended to be used by the MANUFACTURER/VENDOR to aid in theirselection of equipment and/or noise control designs such that individual equipment itemscomply with the equipment noise limits. Further, this document specifies how equipmentnoise levels are to be measured, reported, and guaranteed for this project.

1.3 DEFINITIONS

For the purposes of this specification, the following general definit ions shall apply:

DOCUMENT – Any form, letter, facsimile, contract, specification, requisition, drawing, orrecord of any kind required to transmit information from one party to another. It alsoincludes computer generated drawings, lists, charts, etc. and other data used to form apermanent record of the Project process.

CONCESSION REQUEST - A deviation requested by the SUBCONTRACTOR orVENDOR, usually after receiving the contract package or purchase order. Often, it refersto an authorization to use, repair, recondition, reclaim, or release materials, componentsor equipment already in progress or completely manufactured but which does not meet orcomply with COMPANY requirements. A CONCESSION REQUEST is subject toCOMPANY approval.

SHALL – Denotes a mandatory action or requirement.

SHOULD – Denotes an action or requirement which is not mandatory but which is stronglyrecommended.

In addition to the above general definitions, the following technical definitions shallapply:

All notations and definitions as stated in EEMUA 140.

NOISE LEVEL may refer to either a sound pressure level (L p) with reference to 20 µPa, ora sound power level (Lw) with reference to 1 pW.

Where

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Lp = 20 log 10 (P/P 0) P0 = 20 µPa

Lw = 10 log 10 (W/W 0) W0 = 1 pW

NOTE: All logarithms in this specification are to the base 10.

NOISE LIMIT is a maximum allowable noise level.

IMPULSIVE NOISE is when a noise source contains significant irregularities, such asbangs, clanks, or thumps, or if the noise is only existent momentarily and is of a characterto attract attention. Under these conditions, the noise shall be considered as impulsive forthe purpose of this specification.

NARROW-BAND NOISE is when a noise source contains a pure tone or narrow-bandcomponent which is noticeable to the ear as a noise of distinguishable pitch, and whichrepresents a dominant feature of the total source noise. Under these conditions, thesource noise shall be regarded as containing narrow-band noise for the purpose of thisspecification.

NOTE: Where there is doubt about the subjective assessment of narrow-band noise, itshall be resolved by narrow-band analysis using an instrument with a band-widthnot more than 10 Hz or 1%, whichever is the less (also see Appendix E ofEEMUA 140).

WORK AREA is any position not less than 1 meter from equipment surfaces accessible topersonnel, or any position where a worker's ear may be exposed to noise in the normal

course of his duty. It includes any platform, walkway, or ladder.

2.0 CODES AND STANDARDS

It shall be the CONTRACTOR’S and VENDOR'S responsibility to be, or to become,knowledgeable of the requirements of the referenced Codes and Standards.

The following codes and standards shall, to the extent specified herein, form a part of thisspecification. The latest edition in force at the time of CONTRACTOR’S/VENDOR’Sproposal shall apply.

Conservation of Clean Air and Water in Europe (CONCAWE)

Report 85/52 Acoustic Fatigue in Pipes

Marine Technology Directorate Publication

99/100 Guidelines for the Avoidance of Vibration Induced Fatigue inProcess Pipe work

American Petroleum Insti tu te (API)

API RP 521 Guide for Pressure-Relieving and Depressuring Systems

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Briti sh Standards (BS)

BS EN 61260 Electroacoustics, Octave-band and Fractional Octave-band Filters

BS EN 61672 Electroacoustics, sound-level meters.

BS EN 60942 Electroacoustics. Sound calibrators

Engineering Equipment And Materials Users Association (EEMUA)

EEMUA 104 Noise – A Guide to Information Required from Equipment Vendors

EEMUA 140 Noise Procedure Specification.

EEMUA 141 Guide to use Noise Procedure Specification

EEMUA 161 Guide to the Selection and Assessment of Silencers and AcousticEnclosures

International Electrotechnical Commission (IEC)

IEC 61260 Electroacoustics, Octave-band and Fractional Octave-band Filters

IEC 61672 Specification for sound-level meters.

IEC 60942 Electroacoustics, sound calibrators

IEC 60534-8-3 Industrial Process Control Valves Part 8 – Section 3

Control Valve Aerodynamic Noise Prediction Method


Prediction of Noise Generated by Hydrodynamic Flow

International Organization for Standardization (ISO)

ISO 266 Acoustics - Preferred frequencies for measurements.

ISO 1996 Acoustics, Description & Measurement of Environmental Noise

ISO 9001-2000 Quality Management System Requirements

ISO 9004-2000 Quality Management Guidelines for Performance ImprovementSystem

ISO 19011 Quality Management Guidelines for Performance ImprovementSystem

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Mutual agreement on scheduled submittal of engineering data and drawings shall be anintegral part of any formal Purchase Order.

Comments made by the CONTRACTOR on data or drawings submittal shall not relieveVENDOR(S) or SUBVENDOR(S) of any responsibility in meeting the requirements of thespecifications. Such comments shall not be construed as permission to deviate fromproject or Purchase Order requirements unless specific and mutual agreement is reachedand confirmed in writing.

Each drawing/document shall be provided with a title block in the bottom right-hand cornerincorporating the following information:

Official trade name of the company.

VENDOR'S drawing/document number.

Drawing title giving the description of contents whereby the drawing can beidentified.

A symbol or letter indicating the latest issue or revision.

PO number and item tag numbers.

Revisions to drawing/document shall be identified with symbols adjacent to the alterations,a brief description in tabular form of each revision shall be given, and if applicable, theauthority and date of the revision shall be listed. The term "Latest Revision" shall not beused.

8.0 SUBCONTRACTORS/SUBVENDORS

The VENDOR shall assume unit responsibility and overall guarantee for the noiseproduction for his equipment package and associated equipment.

The VENDOR shall transmit all relevant engineering documents, including specifications,to his SUBVENDORS and SUBCONTRACTORS.

It is the VENDOR’S responsibility to enforce all Purchase Order and project specificationrequirements on his SUBVENDORS and SUBCONTRACTORS.

The VENDOR shall submit all relevant SUBVENDOR and SUBCONTRACTOR drawingsand engineering data to the CONTRACTOR.

The VENDOR shall obtain and transmit all SUBVENDOR’S and SUBCONTRACTOR’Swarranties to the CONTRACTOR/COMPANY, in addition to the system warranty.

9.0 ACOUSTICAL DESIGN

EEMUA 140 forms an integral part of this Specification and the EEMUA definitions havebeen used throughout. Where conflict arises, the requirements of this Specification shalltake preference.

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For acoustical design purposes, all calculations should be performed in the eight octavebands centered between 63 Hz and 8 kHz (see ISO 266). If the frequency spectrum of asource is not known, a frequency spectrum can be estimated from empirical data,published data, measurements of similar equipment, or by using the noise rating curvenumerically 5 dB less than the given dB(A) criterion. The octave band values of theappropriate noise rating curves are given in ISO 1996. The overriding requirement foracoustical design, however, is that the A-weighted Noise Level shall be met.

10.0 NOISE REQUIREMENTS

The control of noise in a plant is required for the following reasons:

To conserve the hearing of personnel

To reduce speech and work interference

To ensure that warning signals are audible

To allow adequate speech, telephone, and radio communication

To maintain working efficiency

To provide quiet accommodation for personnel

To prevent annoyance to the neighboring community.

In general, noise limits can be given for each of the above aspects of noise control,relative to certain areas inside or outside the plant. These general noise limits shall beused by the CONTRACTOR(S) to derive noise limits for each item of equipment, asapplicable, for its particular position in the plant. Specific, individual equipment limits,referred to as 'Equipment Noise Limits', are discussed in detail in the section 12 of thisspecification.

The specified limits shall be met for the design operating conditions of the plant and forother operating conditions which occur occasionally, such as startup, shutdown,regeneration and maintenance. The only requirement for emergency situations, i.e. anyconditions other than just described, which can be foreseen or predicted (e.g. relief) is thatthe absolute limit of section 12.2 shall not be exceeded.

11.0 EQUIPMENT SUBJECT TO NOISE CONTROL

For the purpose of this specification, the following noise sources shall be considered to be"Equipment" and, consequently, have their own noise limitation.

11.1 NORMALLY-OPERATING EQUIPMENT

Normally operating equipment includes:

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a. All rotating machinery (pumps, motors, compressors, fans, gear boxes, turbines,generators, etc.) in continuous operation (including any standby).

b. All control valves that are operating as part of the normal process.

c. All direct-fired heaters and furnaces in continuous operation.

d. Any item that is required to operate for more than 40 hours per week at a time.

11.2 INTERMITTENTLY-OPERATING EQUIPMENT

Intermittently operating equipment is defined as any item that can operate for a period lessthan 40 hours per week, but does not include operation under emergency conditions. With

COMPANY approval, the noise limit for such equipment can be relaxed by up to 3 dB(A).

11.3 EMERGENCY EQUIPMENT

Emergency equipment is any item that operates only under adverse process conditions(relief valves, emergency generators, fire water pumps, etc.). With COMPANY approval,noise limits can be relaxed by up to 6 dB(A) for such items of equipment.

11.4 STARTUP EQUIPMENT

Items that are used only for startup can be treated as emergency operating equipment forthe specification of their noise levels.

12.0 EQUIPMENT NOISE LIMITS

12.1 GENERAL

All definitions, notations, measuring equipment, measuring procedures, test reporting,calculation methods, and calculation procedures shall be in accordance with EEMUA 140.

Equipment noise limits shall be established by the CONTRACTOR(S) using the work areanoise limits, the environmental/community noise limit(s), and/or any other limits stated inthe project specifications.

The equipment noise limits shall be given in an overall dB(A) value or, where consideredmore appropriate, the corresponding octave band spectrum may be specified instead.

All equipment items shall be designed to minimize generation of noise and shall notexceed the noise limits so specified. The use of acoustical insulation, silencers, and/orenclosures is not as preferable as noise control by design.

In all cases, the appropriate equipment noise limit(s) shall be established by theCONTRACTOR and shall be based on his acoustical calculations, performed perEEMUA 140. These limits shall be given to the VENDOR on the project EquipmentNoise Data Sheet (see Appendix 1).

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12.2 EQUIPMENT NOISE LEVELS

Unless other limits are specified in the Requisition/Purchase Order, the equipment noiselimit shall be a sound pressure level of 85 dB(A) +0. The specified noise limit shall beguaranteed and met at any measuring location not less than 1 meter from the equipmentsurface. There shall be no positive tolerances on the emitted noise throughout theoperable range of the equipment, including at low flows.

The VENDOR should be aware that the sound pressure level for broadband noise shallnot exceed 115 dB(A), measured with an instrument set to slow response, at any time andat any place which is accessible to personnel in any situation, including emergencies suchas the blowing of safety relief valves.

These noise level limits may be adjusted upward or downward by the CONTRACTOR whoshall take the following operations and location parameters into account:

The emission of intermittent or fluctuating noise

The emission of narrow-band or impulsive noise

The number of equipment components in a single train

The mounting of several equipment items in close proximity

The location of equipment in a reverberant area

The location of equipment outside of the work area

The amount, type, and location of interconnecting piping

The VENDOR shall comply with the CONTRACTOR’S noise requirements as given in theRequisition/Purchase Order documents.

The VENDOR shall consider, when evaluating the noise pressure level at 1 meter from theequipment surface, as if the equipment concerned was virtually alone in a free field over areflecting plane.

12.3 MAXIMUM SOUND PRESSURE LEVELS FOR SPECIFIC EQUIPMENT ORCOMPONENTS

12.3.1 Control Valves and Depressuring Valves

For each control valve and its associated pipe work, the requirements of section 12.2apply. This also holds for low-rate depressuring valves.

Control valve noise shall be determined for three operating conditions: minimum, normal,and maximum throughput. Noise limits shall not be exceeded for any of these threeconditions.

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Unless otherwise specified, control valve noise evaluation shall follow the predictionmethod given by the following IEC publications:


Control Valve Aerodynamic Noise Prediction Method


Prediction of Noise Generated by Hydrodynamic Flow

12.3.2 Safety/Relief And Emergency Depressuring Valves

The noise from safety/relief valves and hi-rate depressuring valves (and their piping) whichblow under emergency conditions only, shall not exceed the absolute limit of 115 dB(A) inany work area.

The party which sizes safety/relief and emergency de-pressurizing valves shall also beresponsible for the calculation of their noise levels, according to a method to be approvedby the COMPANY. If these calculations are performed by the CONTRACTOR, they shallbe confirmed by the VENDOR, and vice versa.

For any safety/relief valves that are calculated to emit noise above 115 dB(A) at 1 meterdistance, the VENDOR shall include the following with his submittal:

A discussion of high vibrational energy in the valve piping and the associated

acoustic fatigue.

Suggestions for how acoustic fatigue may be mitigated.

Suggestions for how excessive noise radiation from connected pipework can bereduced.

These discussions/suggestions should be addressed by the valve VENDOR, even if theconnected pipework is not in his scope of supply.

CONTRACTOR shall assess all such high noise valves (and all other high differentialpressure devices) in accordance with CONCAWE Report No. 85/52 and MarineTechnology Directorate Publication No. 99/100. CONTRACTOR shall prepare a report

recording this assessment and identifying any proposal modifications to piping design tomitigate the risk of acoustic failure. These mitigating measures shall be subject to approvalby COMPANY.

12.3.3 Piping

VENDORS shall take note that noise emitting from piping is of major importance in plantnoise control and shall be subject to the same restrictions as General Equipment, seesection 12.2. Such noise usually has its origin in equipment such as a valve orcompressor. If the VENDOR’S scope of supply includes any piping attached to equipment

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or components, the piping noise shall be controlled by selecting low-noise equipment (bydesign) or, when this is not reasonably practicable, by incorporating in-line silencers oracoustical insulation.

Guidance into the assessment and reduction of noise emitting from piping by the use ofacoustical insulation is given in DGS-MU-010. The use of in-line silencers in the suctionline of compressors requires approval from the COMPANY.

If connected piping is not within VENDOR’S scope, VENDOR shall confirm anticipatednoise level from the connected piping due to his equipment. This noise level shall bequoted as sound pressure level at 1 meter from outside surface of the pipe, assuming noinsulation.

12.3.4 Vents

All vents incorporated in the design to meet operational requirements shall be subject tothe same restrictions as General Equipment, see section 12.2. Vents intended foremergency use only shall be subject to the same requirements as safety/relief valves persub-section 12.3.2. Where necessary, 'vent' or 'blow-down' silencers shall be incorporatedin the design, at the direction of the CONTRACTOR.

An acceptable method of calculating vent noise is given in API RP 521.

12.3.5 Flares

Since there are environmental noise requirements for this project, low-noise flares are

required, even if the flare is to be used for emergency conditions only.

Elevated flares shall not exceed 85 dB(A) — i.e. the work area limit — at the perimeter ofthe sterile area (which should be at least 60 meters from the flare base) when operating atflow rates up to 15% of maximum flaring capacity.

Sound Pressure level shall not exceed 115 dB(A) at the perimeter of the sterile area whenflow rates exceed 15 % of maximum flaring capacity.

Ground flares shall not exceed 85 dB(A) outside the windscreen or louver wall.

12.3.6 HVAC Systems

For each mechanical and / or rotating equipment such as air conditioner, fan, pump,etc including their drivers, Vendors shall note that emitted noise shall be subject tothe same restrictions as general equipment, see section # 12.2 of Specification DGS-MU-009.

For the air distribution devices used for heating and / or ventilating, the indooracoustical objective shall be as defined in the indoor design conditions mentioned inSpecification DGS-AU-063.

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12.4 MAXIMUM SOUND POWER LEVELS FOR EQUIPMENT OR COMPONENTS

Sound power level limits may be assigned to equipment items or components by theCONTRACTOR. These sound power limits may be in addition to, or in lieu of, soundpressure limits.

12.5 NOISE LIMIT INFORMATION COHERENCE

The CONTRACTOR shall specify either a maximum sound pressure level (Lp) at anylocation 1 meter from the equipment surface or a maximum sound power level (Lw), orboth.

Note that the maxima for sound pressure level and sound power level need not be related

or equivalent since they may originate from different general limits, i.e. the sound pressurelimit may originate from the work area noise limit and the sound power limit from theenvironmental limit.

In all cases, the VENDOR shall propose equipment that complies with all noise level limitsas contained on the data/requisition sheets.

13.0 ACCEPTABLE AND RECOMMENDED NOISE CONTROL MEASURES

13.1 LOW-NOISE DESIGNS

Noise levels shall be minimized by using 'low-noise designs' such as, but not limited to,the following.

13.1.1 Electric motors:

Unidirectional fans, acoustically-lined fan shroud(s), and intake/ discharge silencers maybe used. Additionally, enclosures may be used, subject to COMPANY approval.

13.1.2 Fin-fans:

Limit the impeller tip speeds, use good aerodynamic blade design, reduce the staticpressure drop, increase the number of blades, use hub seals, ensure proper bladeclearance, use aerodynamic design of intakes and discharges, use deeper andsufficiently-heavy transition plenums, adequately dampen or stiffen flat panels (and allowno gaps), etc.

13.1.3 Furnaces:

Construct external furnace walls so that vibration and noise generation are minimized.Natural-draft furnaces should have all burner registers completely enclosed in a commonplenum chamber. Individual burner plenums are an acceptable substitute. If forced-draft orair pre-heat systems are employed, the ductwork shall be externally-lagged or internally-lined (if permitted) with high temperature materials, as necessary.

13.1.4 Fans and blowers:

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Use intake and/or bypass silencers.

13.1.5 Piping Systems:

Vibrating machines shall be acoustically-isolated from the piping system.

Vibration-isolation mounting may be used, where possible. Note that flexibleconnectors shall be subject to COMPANY approval.

Flow velocities shall be limited to the degree required for noise control. As ageneral rule, flow velocities should be limited to less than 100 times the square rootof specific volume (m3/kg) for gases or two-phase flow, and to less than 10 m/s forliquids.

Pipe fitting loss factors shall be limited to avoid excessive noise due to flowdiscontinuity.

13.1.6 Control Valves and Let-down Stations:

For gas and steam service, special-design quiet valves (preferred) or in-linesilencers (subject to COMPANY approval) may be used.

For liquid flows, select valves that will prevent cavitation, erosion, and vibration.

For further noise reduction, lagging may be used (subject to COMPANY approval).

13.1.7 Flares:

The elevated flare noise for normal process balancing or moderate plant upset flows(emergencies excluded) shall be limited with the use of acoustically-baffled, multi-portnozzles to minimize injection noise. Also, the use of a molecular seal or baffled seal drumshould be employed to prevent surging.

13.2 CORRECTIVE MEASURES AND SILENCING EQUIPMENT

Where excessive noise from equipment cannot be eliminated by low-noise design(s),corrective measures may take the form of:

Acoustical insulation for piping, suction vessels, gearboxes

Direct lagging of equipment

Incorporation of in-line silencers (such as in the suction and/or discharge piping ofequipment

Provision for noise-attenuating enclosure(s)

Prior approval of the COMPANY is required for any of the above noise control measures.

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13.2.1 Acoustical Insulation And Lagging

If the VENDOR chooses acoustical insulation as his preferred treatment method to ensurecompliance with his equipment's noise limit(s), that acoustical insulation should beconsistent with the project standard insulation as defined in DGS-MU-010, "AcousticInsulation for Pipes, Valves, and Flanges".

If direct lagging is approved by COMPANY for any equipment, it is the VENDOR’Sresponsibility to ensure that heat buildup cannot occur and cause distortion or damage.For centrifugal compressors, piping shall always be designed to permit the installation ofin-line suction and discharge silencers (whether the silencers are installed or not).

13.2.2 Silencers

Silencers may be included in the tenders for noisy process equipment (see section 15.0).When the VENDOR has been selected, details of such silencing equipment shall beagreed upon between the VENDOR and the CONTRACTOR. The CONTRACTOR maychoose to order silencing equipment separately from the process equipment.

Details of silencers are subject to COMPANY review and approval. If silencers are neededto meet the specified noise limits, these shall meet the following requirements.

a. Silencers shall be constructed from heavy gauge (wall thickness of minimum6 mm) and shall comply with EEMUA 161 and the appropriate codes andstandards for mechanical design. Material of construction shall be equal orsuperior to the connected piping. Internals shall be corrosion resistant steel (SS

316, as a minimum). The design of silencers shall ensure that any internal partsthat may inadvertently break loose do not partly or completely block the silenceroutlet or damage downstream equipment. Inline silencers shall comply with theappropriate pipe class.

b. Silencers intended to only suppress commissioning noise may be of a movabletype. Silencers for the reduction of noise in transient operations such as startup,shutdown, etc. shall be permanent.

c. The absolute limit for the calculated velocity through a silencer splitter is 25 m/s.

13.2.3 Enclosures

Enclosures may be included in the tenders for noisy process equipment (seesection 15.0). When the VENDOR has been selected, details of such enclosures shall beagreed upon between the VENDOR and the CONTRACTOR. The CONTRACTOR maychoose to order enclosures separately from the process equipment.

Details of acoustical enclosures are subject to COMPANY review and approval. Ifacoustical enclosures are needed to meet the specified noise limits, these shall meet thefollowing requirements.

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a. Acoustical enclosures may be either of the 'close fitting' or 'walk-in' (large) type.'Close fitting enclosures', are enclosures where access to the machine for routineoperations is from outside and is obtained through hatches or removable panels.'Walk-in enclosures' are those where the operator enters the enclosures for routineoperations.

b. Large enclosures shall be designed in such a way that operating/maintenancepersonnel can conduct their work without being hampered in their movements.Large enclosures shall also be subdivided in such a way that personnel servicingthe equipment during partial shutdown are not exposed to excessive noisegenerated by other equipment that may also be in the enclosure. This can beachieved, for example, by a separating wall between two independent trains ofequipment.

c. Sound-absorbing material shall have a minimum absorption coefficient of 0.2 forfrequencies above 200 Hz, averaged over the walls and ceiling.

d. The design of the enclosures shall be such that the normal operation andmaintenance are not compromised. In particular, all instrumentation and controlsshall be either mounted externally to the enclosure, or clearly visible andcontrollable from outside the enclosure.

e. Enclosures shall be adequately purged and cooled. Instrumentation, sensors, andcables installed inside enclosures shall not be subjected to an environment whichcauses the components to be operated outside the VENDOR’S specified ambienttemperature limits.

f. The atmospheric conditions prevailing at the project site are dusty, humid, andpolluted with salt, soot and traces of sulfur dioxide. The conditions are highlycorrosive and VENDOR shall state the measures adopted to ensure the equipmentwill function effectively in this environment. Particular attention should be paid tothe painting requirements and the enclosure should be designed to withstand thesite design wind velocities.

g. The general construction of enclosures shall consist of standard acoustical panelscomprising of mineral wool sandwiched between sheet steel on the outside andstainless steel perforated sheet on the inside, mounted on a steel frame work.Within the enclosures of machinery, risk of oil splashing shall be minimized.Mineral wool filling shall be enclosed in a thin impervious membrane, to avoid risk of

fire hazard caused by wicking action. Sealing plates shall be provided by VENDORto fit around all pipes, conduits, and trays leading to and from the machineenclosed. CONTRACTOR shall pay particular attention to his method of securingthe enclosure to the foundation. All joints between panels and the frame as well asbetween the frame and foundation(s) shall be acoustically sealed.

h. Any openings shall be acoustically treated to prevent noise escaping from theenclosures. For this purpose, acoustical louvers and splitter silencers shall beconsidered and provided.

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i. All doors shall be sound-resistant, sealed around the edges, and have heavy-dutyhinges with bolts that can be unlocked from the inside and towards the outside. Forlarge enclosures, it shall be possible to open doors from the inside at all times bypanic action catches, regardless of external door catches. The position of the doorsand catches shall be clearly marked with reflective symbols both inside and outside.

j. All enclosures shall be designed for easy construction, dismantling, and replacing tothe original design conditions. For the purpose of major maintenance, the enclosureshall be designed so that roof and wall modules can be removed by crane withoutcompletely dismantling the enclosure. Material handling facilities to remove anycomponent of weight less than 6 metric tons shall be provided.

k. The enclosure shall be isolated from vibrations due to the machine or its associated

pipes, cables, etc..

l. All enclosures shall include a ventilation system. Natural-draft ventilation may beconsidered for close-fitting enclosures. Large enclosures shall have forced-draftventilation utilizing two fans, each rated at 100% duty. (In normal operation, onefan will be running while the other will be a standby spare.)

m. All large enclosures shall be fitted with internal fire detectors and an appropriate fireextinguishing system. For process compressors and gas turbines, gas detectionsystem(s) shall also be provided.

n. Small enclosures shall be fitted with appropriate windows and lighting, wherenecessary, for inspecting the enclosed equipment. Large enclosures shall be

provided with internal lighting.

o. Small enclosures shall be fitted with hatches, where necessary, for the routinemaintenance and inspection of the equipment. These shall be sized and positionedto provide adequate access to the equipment.

p. Overspeed trip initiating devices (levers, arms, push buttons, etc.) shall be locatedoutside the enclosures.

q. Minimum site assembly is required and therefore the CONTRACTOR shall ensurethat the VENDOR performs all drilling and cutting operations in his workshop. Boththe enclosure frame and the panels shall be of bolted construction. Sand and dustingress into the enclosure shall be eliminated through enclosure joints.

r. Where units can not be shipped complete, the maximum panel size shall be used.Each element of an enclosure shall be tagged with a reference number. Tagnumbers shall be painted on each enclosure element. All elements of an enclosureshall be shipped in one consignment. Each packing case shall state the tagnumber that it contains. Each enclosure package shall contain its own bulkmaterials. Tag numbers shall relate to the tag number of equipment to be enclosed,such that any part, even if duplicated elsewhere, has its own unmistakable tagnumber.

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s. All steel surfaces shall have adequate weather and corrosion protection and theVENDOR shall provide information on the protection provided. Surface preparationand painting shall be in accordance with project specifications.

14.0 CONTRACTOR RESPONSIBILITY

The CONTRACTOR shall establish the noise limit(s) for all relevant components, items ofequipment, or equipment trains, and shall specify these limits using the project EquipmentNoise Data Sheet. (see Appendix 1).

The Equipment Noise Data Sheet shall specify all noise level limits, whether in terms ofsound pressure or sound power, or both.

The CONTRACTOR shall ensure that all VENDORS have provided in their tenders all theinformation required in accordance with the project noise specifications. Further, theCONTRACTOR shall ensure that the VENDOR is made aware of the obligation to statenoise guarantees for the equipment to be provided, for any of the conditions of operationfor which the equipment may be expected to be used.

15.0 VENDOR RESPONSIBILITY

15.1 GENERAL

The VENDOR shall submit, along with his quotation, Equipment Noise Data Sheet(s) dulyfilled-in showing guaranteed sound power levels and guaranteed sound pressure levels ofthe equipment, together with any other relevant information as requested in the data

sheets. The following minimum information is required for evaluation of the quotations.

a. Unsilenced sound pressure and sound power overall dB(A) levels and octave bandlevels for his 'standard' equipment and connected piping. If noise data of thestandard item is not in conformance with the maximum allocated noise level,VENDOR shall indicate that special treatment measures are proposed to meet thespecified levels.

b. Silenced sound pressure and sound power overall dB(A) levels and octave bandlevels for the equipment; together with details of the silencing measures that areproposed for meeting the specified noise limits.

c. Where a technical choice is available between equipment of low noise emission by

design and equipment with 'path-treatment', the former is preferred. However, thecosts for all design and treatment alternatives should be clearly indicated in theVENDOR noise data submittal package.

d. In the case of a special design, VENDOR shall detail the applied techniques,together with the anticipated noise levels.

e. In the case of acoustical treatment, VENDOR shall provide the details and extent oftheir proposed noise treatment, together with the anticipated noise level.

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f. When alternative acoustical treatments are quoted by the VENDOR, the proposalshall contain all pertinent design details and effects on performance, if any, for allalternatives given.

g. If the tender includes the use of silencers and/or acoustical enclosures, theVENDOR shall also complete data requisition sheets for each silencer and/orenclosure. The project Silencer Data Sheet and Enclosure Data Sheet shall beused (see Appendices 2 and 3, respectively).

h. If the specified limits cannot be met, the minimum attainable sound pressure andsound power overall dB(A) levels and octave band levels shall be given. In suchcases, VENDOR shall also confirm in his quotation that he does not have anyspecial designs of the equipment nor treatment methods which are inherently less

noisy.

Abatement designs shall not limit equipment operation, nor shall they create any safety orfire hazards.

All noise levels quoted shall have an upper tolerance of +0 dB.

NOTE: If guarantees have been provided in some other way, specification of noiselimits on individual data/requisition sheets is not required. For example, where aVENDOR provides all the pumps or motors in a project, a list of guaranteednoise levels and spectra per item will be acceptable.

15.2 EQUIPMENT NOISE GUARANTEE

Equipment noise in the installed condition (at-site), while operating within its operationalrange, shall not exceed the agreed noise levels (with no positive tolerance).

Any remedial work performed as a result of the VENDOR’S failure to meet the guaranteednoise level shall be back-charged to him. Equipment will only be available for remedialwork at a time designated by the COMPANY.

15.3 NOISE ACCEPTANCE TESTS

15.3.1 General

The CONTRACTOR shall decide which equipment shall have a noise test run at the

VENDOR’S works and shall inform the COMPANY and the VENDOR accordingly. Thepurpose of the shop acceptance test is to identify and rectify major problems, if any, toassure that the equipment, when finally tested at site, will meet the overall noise levelcriteria. All shop test runs shall reflect the in-situ arrangement and a suitable testprocedure shall be agreed upon by the CONTRACTOR and the VENDOR. TheCOMPANY reserves the right to review and comment on any shop noise test procedure.

During the shop noise test, noise control treatments (such as job silencers and/oracoustical enclosures) may be used, provided they are included in the equipment tender.

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The measuring instruments shall be installed in such a way so that the measurements arenot affected by external factors (drafts, vibrations, etc.). Measurements shall be carriedout at 1.5 (± 0.2) meters from the ground or working level.

All A-weighted sound pressure levels and any findings shall be recorded, along with thefollowing information.

Make, model number, and serial number of the measuring instrument.

Local weather conditions during the measurement (wind speed and direction, rain,humidity level, atmospheric pressure, temperature, fog, smog, etc.)

Date and Time of measurement

Measurement position on a plan drawing along with a brief location description.

Description of the source of noise and its position in the area where measurementsare carried out. Include Plant Unit/Tag Number of the equipment/Line Number, asapplicable.

Type of noise (continuous, intermittent, fluctuating etc.). In the case of intermittentsound pressure levels, the maximum and minimum levels as well as theintermittence shall be recorded.

In the case of closed spaces, room dimensions, location of openings, and theposition of windows and doors (indicate whether open or closed) shall be recorded.

15.3.4 Calculations

All noise level calculations, including general acoustical calculations, methods forcalculating sound power levels, and the conversion of sound pressure levels to soundpower levels shall be performed per EEMUA 140.

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APPENDIX 1

EQUIPMENT NOISE DATA SHEET, PAGE 1

For the working, electronic version of this data sheet, please refer to STD-MU-00001.

Contract

Criticality Rating: Item No.

EQUIPMENT NOISE Revision Date:

DATA SHEET By Chk'd: Appr'd:

TAKREER Date:

P.O. No.

Client TAKREER Plant Ruwais Ref inery Inquiry No.

Service Site Ruwais, AbuDhabi

Sheet 1 Of 2

1 SOUND SOURCE - APPLICATION

2 Item Equipment Manufacturer Power Size Notes

3 Type kW Length Breadth Height

4

5

6

8 INSTRUCTIONS TO SUPPLIERS

9 Acoustical definitions, methods, and procedures shall be in accordance with DGS-MU-009 and EEMUA 140

10 All noise levels, Lp or Lw, shall be guaranteed with an upper tolerance of +0 dB; octave band levels are in un-weighted decibels.

11 Lp(x) is Sound Pressure Level in decibels re 20 µPa at x meters from the source and Lw is Sound Power Level in decibels re 10E-12 Watts.

12 The noise guaranteed by the equipment and/or components shall not exceed the more stringent of the noise limits given in the table below, for any of the conditions of operations for which the equipment may normally beexpected to be used.

13 If the equipment generates noise with tonal or impulsive components, the limits shall be taken to be 5 dB more stringent (for the overall, A-wtd level).

14 If the measured Lp levels surrounding the equipment differ by 6 dB or more in any octave band, the Supplier shall complete Sheet 2.

15 If the noise levels exceed the overall limit(s), OR if the equipment noise level exceed the octave band limit (in any band) by more than 5 dB, the Supplier shall provide data for acoustically-treated equipment and shall includedetails and costs of the treatment.

18 Configurati on Codes: Data Source Codes:

19 "(Completed by Purchaser) 0 Required noise levels in Lp or Lw or both A Noise Test, equipment loaded

20 "(Completed by Supplier) 1 Guaranteed noise levels without acoustical provisions B Noise Test, equipment unloaded

21 "(Completed by Supplier) 2 Guaranteed noise levels with acoustical provisions C Noise Test, identical equipment

22 D Noise Test, similar equipment

23 "(Completed by Supplier) 3 Estimated noise levels, not necessarily guaranteed E Noise Test, outdoor (free-field)

24 "(Completed by Supplier) 4 F Noise Test, other - attach explanati on

25 "(Completed by Supplier) 5 G Calculation/estimation - attach details, calculations, and explanations

26 H Other - attach explanatio n

27 ACOUSTICAL PERFORMANCE

28 Noise measurements and calculations shall be carried out in accordance with EEMUA 140

29 To be completed by: Purchaser Seller, if not specified byPurchaser

Seller (also indicate if data is measured orestimated)

30 EQUIPMENT TRAIN Config'n Level OVERALL Data ACOUSTICAL TREATMENT,

31 AND COMPONENTS Code Type* 63 125 250 500 1000 2000 4000 8000 LIN. A-WTD S ource REMARKS, AND NOTES

32 0 Lp(x) Req'd

33 0 Lw Req'd

34 Lp(x)

35 Lw

36 Lp(x)

37 Lw

38 Lp(x)

39 Lw

40 Lp(x)

41 Lw

42 Lp(x)

43 Lw

44 Lp(x)

45 Lw

46 Lp(x)

47 Lw

48 * Measured at x meters from any equipment surface or enclosure face (measuringposition details are to be included with data submittal).

49 INFORMATION TO BE SUBMITTED WITH THE TENDER - Include all necessary drawings and engineering notes

50 Guaranteed acoustical performance information asindicated above

51 Description of measurement details as indicated above (attachadditional pages, as needed)

52 Explanations, details, and/or calculations as prescribed above (attachadditional pages, as needed)

53 Description of special designs/acoustical treatments used to meet requirements(attach additional pages, as needed)

54 Details of added costs for special designs/acoustical treatments (attachadditional pages, as needed)

55 Completed silencer and/or enclosure datasheet, as applicable

56 Other:

57 REMARKS

58

59

60

61

62

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APPENDIX 1

EQUIPMENT NOISE DATA SHEET, PAGE 2


Criticality Rating: Contract 0

Item No. 0

EQUIPMENT NOISE Revision 0 Dat

DATA SHEET By Chk’d Appdd

(CONTINUED) P.O. No. 0

Inquiry 0

Client TAKREER Plant Ruwais Refinery Sheet 2 Of 2

Servic 0 Site Ruwais, Abu Dhabi

1 ALL DAT A AND INFORMATION BELOW IS TO BE PROVIDED BY THE SUPPLIER PER PROJECT REQUIREMENTS

2 LAYOUT DIAGRAM OF EQUIPMENT AND NOISE MEASUREMENT POINTS

3

4

5 DETAILED SOUND PRESSURE LEVEL MEASUREMENT DATA

6 Noise measurements and calculations shall be carried out in accordance with EEMUA 140

7 Sound Pressure Level in decibels re 20 µPa at indicated distance from the source; octave band levels are in un-weighted decibels

8 MEASUREMENT DIST. OCTAVE BAND CENTER FREQUENCY HERTZ OVERALL REMARKS AND NOTES9 LOCATION (m) 63 125 250 500 1000 2000 8000 LIN. A-WTD

10 011 0

12

13

18

19

20

21

22

23

24

25 * Measured at x meters from any equipment surface or enclosure face (measuring position details are to be included with data

26 Comment

27

28

29

30

31

32

34

35

36

37

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APPENDIX 2

SILENCER DATA SHEET


Criticality Rating Contract

Item No. Revision Date:SILENCER DATA SHEET

By Chk’d Appr’d:TAKREER Date:P.O. No.

Client TAKREER Plant Ruwais Refiner In uir No.Service Site Ruwais, Abu Dhabi Sheet 1 o 1


2 Compressor (Type) Fan/Flower (Type)

3 Pressure (Type) Vent (Type)4 Steam Turbine Gas Turbine Diesel/Gasoline Engine Other

5 Suction Discharge Inline 6 FLOW CONDITIONS:

7 Name of Mea8 Molecular Mea9 Temperature, °C Mea10 Flow Rate, m³ /h Mea11 Fluid Velocity, m/s Mea12 CONNECTIONS: Sizes Area m²

13 PRES Upstream (of Equipment) kg/cm²g Downstream (of Equipment) kg/cm²g14 PRESSURE ΔP Allcwable kg/cm²15 ACOUSTICAL PERFORMANCE

16 To be completed by: Purchaser Seller, if not specified by Seller (also indicate if date is measured or estimated)17 OCTAVE BAND CENTER FREQUENCY (HERTZ) OVE Data18

Sound Pressure Level (Lp) in Decibels(Re: 20 micropascal, µPa) 63 125 250 500 1000 2000 4000 8000

19 Required Lp @ 3 m.* 20 or Required Insertion loss 21 Unsilenced Lp @ 3 m.* 22 Guaranteed Silenced 3 m.* 23 Guaranteed Insetion Loss 24 Actual Lp @ 3 m.*

25

26

* Mesured at 3 metersfro the extreme outside point of the opening perpendicular to the direction of flow (Atmospheric Vent or Suction Silencers), or 3meters downstream at 1 meter from pipe or duct (Inline Silencers).

27

28 SILENCER DESIGN & FLOW PERFORMANCE Com leted b Seller 2930 TYPE: Chamber Straight Thru Packed Other 31 Spark Arrester Heat Nor-Packed 32 MATERIAL Casing Internals Packing33 CONNECTION Type Rating34 Locations & Sizes &35 CONSTRUCTION ASME Stamp36 SURFACE SSPC Painting37 WEIGHTS Shipping kg Installed kg38 PERFORMANCE Pressure kg/cm²g @ °C Pressure Drop ΔP Actual_kg/cm

2

39 Pressure kg/cm²g @ °C40

41 SYSTEM BLOCK DIAGRAM – CRITICAL DIMENSIONS42434445464748 REMARKS4950515253

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APPENDIX 3

ACOUSTICAL ENCLOSURE DATA SHEET

For the working, electronic version of this data sheet, please refer to STD-MU-00003

Criticality Rating: Contract

Item No.

ACOUSTIC Revision Date:

DATA SHEET By Chk'd: Appr'd:

TAKREER Date:

P.O. No.

Client TAKREER Plant Ruwais Refinery Inquiry No.

Service Site Ruwais, Abu Dhabi Sheet 1 of 1


2 Item Equipment Manufacturer Model RPM Power Oper'g Equip. heat Medium handled Notes3 Type kW Temp, °C release, kJ/h by equipment4 Driver

5 Gear box

6 Driven

7 Other

8 ACOUSTICAL PERFORMANCE

9 Noise measurements and calculatio ns shall be carried out in accordance with EEMUA 140

10 To be com pleted by: Purchaser Sel le r, i f not speci fied by Purchaser Sel le r ( also indica te i f data i s m easu red o r est im ated )11 Sound Pressure Level (Lp) in decibels re 20 µPa or OCTAVE BAND CENTER FREQUENCY (HERTZ) OVERALL Data

12 Sound Power Level (Lw) in decibels re 10E-12 W 63 125 250 500 1000 2000 4000 8000 A-WTD Source

13 - Total Lw of unsilenced equipment14 - Max. Lp from unsilenced equip. @ 1 m.*

15 - Required total Lw from equipment

16 - Required max. Lp from equip. @ 1 m.*

17 - Required Insertion Loss for enclosure **

18 - Required max. Lp from encl. @ 1 m.*

19 - Guaranteed total Lw from enclosure

20 - Guaranteed max. Lp from encl. @ 1 m.*

21 - Guaranteed Insertion Loss for enclosure **

22 * Measured at 1 meter from any equipment surface or enclosure face (measuring position details are to be included with data submittal) .

** If acoustical or mechanical characteristics differ across individual enclosure faces or components, all details of differences are to be included with data submittal.

24 ENCLOSURE DESIGN & MECHANICAL CHARACTERISTICS (Completed by Purchaser - circle appropriate attribute)

25 Acoustical enclosure shall be constructed in accordance with DGS-MU-009

26 TYPE: "Close-fitting" or "Large (walk-in)" VENTILATION/LIGHTING:27 ACCESS: Perso Yes No Ventilation to be provided by: Seller Others

28 Acces Yes No Type of Ventilation: Natural Forced Induced

29 If yes, number required and min. m Number of enclosure air changes/hour (normally 20):

30 Observation Windows: Yes No Min/Max pressure in enclosure: / kg/cm²

31 Remo Yes No Number of fans required: Standard Spare

32 Min. m Fan failure alarm required: Yes No

3 3 E xte r Li ght ing r eq ui red: Yes No per

34 Area classifi cation for fan motors and lighting:

35

36 CONSTRUCTION: INSTRUMENTATION: provided by:

37 Operating Environment (climate): Gauges, indicators, etc. to be installed on the enclosure: Seller Others

38 To be installed: in the open under cover

39 Single composite construction (lift-off type): Yes No

40 Composite encl. made of removable panels: Y es No

41 If yes, mechanically manually provided by:

42 Acoustical lining: with membrane without SAFETY: Yes No Alarm Trip Seller Others

43 If with Yes No Explosion monitors required:

44 Painting or anti-corrosi on treatment: If yes, the number of compartments: and

45 Connections to external lagging: the number of monitors in each compartment:

46 Lifting facilities: Yes No Toxic gas monitors required:

47 If yes, kg If yes, the number of compartments: and

48 the number of monitors in each compartment:

49 NOTES/DETAILS: Fire-fighting system required:

50 If yes, the type of system(s): and

51 the number of points:

52 INFORMATION TO BE SUBMITTED WITH THE TENDER - Includ e all necessary dr awings and engi neering no tes53 Acoustical performance as indicated above Drwgs w/ overall dimensions, access ways, windows, penetrations , & internals

54 Details of openings constructions (incld'g hinges, panic-action catches, etc.) Surface protection (internal and external)

55 All materials of constructi on (incld'g outer casing & absorptive packing) Method of sealing panel joints from noise leakage paths

56 Type of absorptive packing, method of retention, and replacement method Assembly and dismantling requirements (including lifting requirements)

57 Total weight of enclosure and weights of each component or section Details of ventilation system including silencers and ducting

58 Method(s) of vibration isolation from (a) equipment, (b) piping/ducti ng, & Details of instrumentat ion, safety monitoring, and fire-fig hting systems

59 (c) base or foundation Other: _________________ ___________________ _________________ __

60 REMARKS61

62

63

64

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