200-20-SH-DEC-00007

NFPS Offshore Compression Complexes Project COMP2

COMPANY Contract No.: LTC/C/NFP/5128/20

CONTRACTOR Project No.: 033734

Document Title

NOISE AND VIBRATION DESIGN PHILOSOPHY FOR CP6S AND CP7S COMPLEXES

COMPANY Document No.

: 200-20-SH-DEC-00007

Saipem Document No.

: 033734-B-D-30-SPM-LP-S-10026

Discipline

: HSE&Q

Document Type

: DESIGN CRITERIA

Document Category/Class

: 1

Document Classification

: INTERNAL

10-Apr-2023

Issued for Approval

Choy Kok Chuan

15-Mar-2023

Issued for Review

Choy Kok Chuan

Francis Minah / Rama K. Kotha Francis Minah / Rama K. Kotha

Luminita Oprescu

REV.

DATE

DESCRIPTION OF REVISION

PREPARED BY

CHECKED BY

APPROVED BY

Saipem S.p.A.

Company No._Rev. 200-20-SH-DEC-00007_B

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REVISION HISTORY

Revision

Date of Revision

Revision Description

28-Feb-2023

15-Mar-2023

10-Apr-2023

Issued for Inter-Discipline Check

Issued for Review

Issued for Approval

HOLDS LIST

Hold No

Hold Description

Detailed Design Studies Document Number

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TABLE OF CONTENTS

INTRODUCTION … 4

1.1 PROJECT OBJECTIVE … 4 1.2 PROJECT SCOPE … 4

DEFINITIONS AND ABBREVIATIONS … 6

2.1 GENERAL DEFINITIONS… 6 2.2 TECHNICAL DEFINITIONS … 6 2.3 ABBREVIATIONS … 8

REFERENCE, RULES, CODES AND STANDARDS … 10

3.1 QATARI GOVERNMENT AND REGULATORY REQUIREMENTS … 10 3.2 COMPANY DOCUMENTS … 10 3.3 PROJECT DOCUMENTS (FEED) … 10 3.4 PROJECT DOCUMENTS (DETAILED DESIGN) … 11 INTERNATIONAL CODES AND STANDARDS … 11 3.5

NOISE REQUIREMENTS … 12

4.1 NOISE & VIBRATION OBJECTIVES… 12 4.2 REGULATORY REQUIREMENTS … 12 4.3 NOISE EXPOSURE STANDARD … 12 4.4 NOISE LIMITS… 12

4.4.1 General Work Area Limit … 13

4.4.2 Absolute Limit … 14

4.4.3 Equipment Noise Limits… 14 4.5 NOISE AND VIBRATION STUDY … 14 4.6 NOISE CONTROL PROCESS … 15 4.7 NOISE RESTRICTED AREAS … 15 4.8 NOISE LEVEL TARGET IN ROOMS AND ACCOMMODATION AREAS … 16 4.9 ACOUSTIC TREATMENTS … 17 4.10 NOISE ABATEMENT MEASURES … 18

VIBRATION CONTROL REQUIREMENTS … 19

5.1 OBJECTIVES … 19 5.2 TOPSIDE VIBRATION LIMITS (PERSONNEL) … 19 5.3 VIBRATION LIMITS IN LIVING QUARTERS … 20 5.4 VIBRATION CONTROL … 20

NOISE & VIBRATION CONTROL MANAGEMENT … 22

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INTRODUCTION

The North Field is the world’s largest natural gas field and accounts for nearly all of the state of Qatar’s gas production. The reservoir pressure in the North Field has been declining due to continuous production since the early 1990s. The principal objective of the NFPS Project is to sustain the plateau from existing QG South Operation (RL Dry Gas, RGE Wet gas) and existing QG North Operation (QG1 & QG2) production areas by implementing an integrated and optimum investment program consisting of subsurface development, pressure drop reduction steps and compression. Refer to the figure below for a schematic of the North Field.

Qatargas Operating Company Limited is leading the development of the North Field Production Sustainability (NFPS) Project.

1.1 Project Objective

The objective of this Project includes:

• Achieve standards of global excellence in Safety, Health, Environment, Security and Quality

performance.

• Sustain the Qatargas North Field Production Plateau by installing new Compression Complex facilities CP6S & CP7S in QG south with integration to the existing facilities under Investment #3 program.

• Facility development shall be safe, high quality, reliable, maintainable, accessible, operable, and

efficient throughout their required life.

1.2 Project Scope

The Project Scope includes detailed engineering, procurement, construction, transportation & installation, hook-up and commissioning, tie-in to EXISTING PROPERTY and provide support for start- up activities of the following facilities and provisions for future development. The WORK shall be following the specified regulations, codes, specifications and standards, achieves the specified performance, and is safe and fit‐for‐purpose in all respects.

Offshore

CP6S and CP7S Compression Complexes that are part of QG-S RGE facilities as follows:

• CP6S Compression Complex

• Compression Platform CP6S, Living Quarters LQ6S, Flare FL6S

• Bridges BR6S-2, BR6S-3, BR6S-4, BR6S-5

• Bridge linked Tie-in to RP6S

Production from existing wellheads (WHP6S & WHP10S) and new wellhead (WHP14S) are routed via riser platform RP6S to compression platform CP6S to boost pressure and export to onshore via two export lines through the existing WHP6S pipeline and a new 38” carbon steel looping trunkline from RP6S (installed by EPCOL). CP6S is bridge-linked to RP6S.

• CP7S Compression Complex

• Compression Platform CP7S, Living Quarters LQ7S, Flare FL7S

• Bridges BR7S-2, BR7S-3, BR7S-4, BR7S-5

• Bridge linked Tie-in to RP7S

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CP7S shall receive production from existing wellheads (WHP5S & WHP7S) and new wellhead (WHP13S). There is only one export line for CP7S through the existing export pipeline from WHP7S. CP7S is bridge-linked to RP7S.

RGA Complex Destressing

Migration of the Electrical power source, Telecoms, Instrumentation and Control systems from WHPs and RPs hosted by RGA to the respective Compression Complexes listed below:

• WHP6S, WHP10S, WHP14S, RP6S and RP10S to CP6S Compression Complex

• WHP5S, WHP7S, WHP13S and RP7S to CP7S Compression Complex

Destressing of Telecoms, Instrumentation and Control system in RGA Complex Control Room, which would include decommissioning and removal of telecom system devices and equipment that would no longer be required post migration and destressing activity.

Onshore

An Onshore Collaborative Center (OCC) will be built under EPC-9, which will enable onshore based engineering teams to conduct full engineering surveillance of all the offshore facilities. The OCC Building will be located in Ras Laffan Industrial City (RLIC) within the Qatar Gas South Plot. MICC & Telecommunication, ELICS related scope will be performed in the OCC building.

Figure 1.2.1: NFPS Compression Project COMP2 Scope

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2 DEFINITIONS AND ABBREVIATIONS

2.1 General Definitions

Definition

COMPANY CONTRACTOR

DELIVERABLES

FACILITIES

MILESTONE

PROJECT

SITE

SUBCONTRACT

SUBCONTRACTOR

WORK

WORK PACKAGE

VENDOR

2.2 Technical Definitions

Definition

BROADBAND NOISE

DECIBELS

dB(A)

Description

fabricated,

Qatargas Operating Company Limited. Saipem S.p.A. All products (drawings, equipment, services) which must be submitted by CONTRACTOR to COMPANY at times specified in the contract. All machinery, apparatus, materials, articles, components, systems and items of all kinds to be designed, engineered, procured, manufactured, constructed, supplied, tested and permanently installed by CONTRACTOR at SITE. A reference event splitting a PROJECT activity for progress measurement purpose. NFPS Offshore Compression Complexes Project COMP2 (i) any area where Engineering, Procurement, Fabrication of the FACILITIES related to the CP6S and CP7S Compression Complexes are being carried out and (ii) the area offshore required for installation of the FACILITIES in the State of Qatar. Contract signed by SUBCONTRACTOR and CONTRACTOR for the performance of a certain portion of the WORK within the Project. Any organization selected and awarded by CONTRACTOR to supply a certain Project materials or equipment or whom a part of the WORK has been Subcontracted. Scope of Work defined in the CONTRACT. The subdivision. The person, group, or organization responsible for the design, manufacture, the Equipment/Material.

lowest manageable and convenient

load-out/shipping

in each WBS

testing,

level

and

Description Broadband noise is a type of noise that has energy distributed evenly across a wide range of frequencies. It is characterized by a “hissing” sound, with no particular frequency standing out. A relative unit of measurement widely used in acoustics, electronics and communications. Ten times the logarithm of the ratio of a measured quantity to a reference value. The ratio may be sound power, sound pressure, voltage, sound intensity, etc. The linear dB scale is usually modified by the A-weighting ‘filter’ to simulate the non-linear response of human hearing. The application of this filter is denoted by appending an ‘A’; to the dB units. The unit may be presented as dBA or dB(A).

IMPULSIVE NOISE

A sharp burst of sound occurring for less than one-half second in duration and not repeating more than once per second.

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Definition

RMS

SOUND POWER

SOUND POWER LEVEL

SOUND PRESSURE

SOUND PRESSURE LEVEL

SOUND TRANSMISSION CLASS TIME WEIGHTED AVERAGE SOUND LEVEL

TONAL NOISE

Description The mathematical means by which a signal that is regularly oscillating around a mean of zero, is ‘averaged’ such that the result is not zero. This involves squaring, averaging and then taking the square root of the signal. The Weighted Sound Reduction Index is a single number index used to characterize the level of sound insulation provided by a structure such as a wall, window, door, or ventilator as measured in a lab. It is defined in the series of international standards ISO 140 (parts 1-14) The total sound energy radiated by a source in all directions, measured in watts. Under fixed operating conditions the sound power of a source is constant and independent of the environment in which it is operating. Sound power is often used to describe the noise emission of a machine and allows comparison of the ‘source strength’ of equipment. Ten times the logarithm of the ratio of the sound power to the sound power reference level. Sound power levels can only be calculated from measured sound pressure or sound intensity levels. Sound power levels are usually denoted by Lw and the reference sound power is 1 x 10-12 W. The difference between the pressure caused by a sound wave and the ambient pressure of the medium it is passing through, measured in Pascals, Pa. Twenty times the logarithm of the measured RMS sound pressure divided by the reference sound pressure. Sound pressure levels are usually denoted by Lp and the reference sound pressure is 20 µPa. An integer rating scheme to characterize the transmission loss of a partition.

Daily noise exposure normalized to an 12-hour working day.

Tonal Noise has energy concentrated at specific frequencies, and is characterized by a distinct pitch or tone. Examples of tonal noise include the sound of a whistle, the hum of an electric motor, or the whine of a jet engine.

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2.3 Abbreviations

Code

Definition

AHU

AIV

BR6S-2

BR6S-3

BR6S-4

BR6S-5

BR7S-2

BR7S-3

BR7S-4

BR7S-5

CP6S

CP7S

FAT

FIV

HVAC

Leq

LOF

LQ6S

LQ7S

NRC

OCC

PWL

Air Handling Unit

Acoustic Induced Vibration

Bridge 2 at Compression Platform at WHP 6 Complex

Bridge 3 at Compression Platform at WHP 6 Complex

Bridge 4 at Compression Platform at WHP 6 Complex

Bridge 5 at Compression Platform at WHP 6 Complex

Bridge 2 at Compression Platform at WHP 7 Complex

Bridge 3 at Compression Platform at WHP 7 Complex

Bridge 4 at Compression Platform at WHP 7 Complex

Bridge 5 at Compression Platform at WHP 7 Complex

Compression Platform at CP 6 Complex

Compression Platform at CP 7 Complex

decibels

Factory Acceptance Test

Flow Induced Vibration

Heating, ventilation, and air conditioning

Average Sound Pressure Level

Likelihood of Failure

Living Quarters Platform at CP 6 Complex

Living Quarters Platform at CP 7 Complex

Noise Reduction Coefficient

Onshore Collaborative Center

Sound Power Level

Qatargas

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Code

Definition

RasGas Expansion – Wet Gas System

Ras Laffan Industrial City

Riser Platform 6S

Riser Platform 7S

RGE

RLIC

RP6S

RP7S

RP10S

Riser Platform 10S

STC

WHP5S

WHP6S

WHP7S

WHP10S

WHP13S

WHP14S

Sound Reduction Index

Sound Transmission Class

Wellhead Platform 5S

Wellhead Platform 6S

Wellhead Platform 7S

Wellhead Platform 10S

Wellhead Platform 13S

Wellhead Platform 14S

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3 REFERENCE, RULES, CODES AND STANDARDS

The following codes, standards and specification are referenced within the document shall be considered as part of this specification. Conflict among applicable specification and / or codes shall be brought to the attention of the COMPANY for resolution COMPANY decision shall be final and shall be implemented. The latest editions of codes and specification effective as on date of contract shall be followed.

In general, the order of precedence shall be followed:

a) Qatari Government and Regulatory Requirements

b) COMPANY Procedures, Policies and Standards (Exhibit 5 Appendix I)

c) Project Specifications.

d) Industry Codes and Standards

e) COMPANY and CONTRACTOR’s Lessons Learned

3.1 Qatari Government and Regulatory Requirements

S. No

Document Number

Title

Qatari Environment Law 2002, Degree No. 30

3.2 Company Documents

S. No

Document Number

Title

COMP-QG-PR-REP- 00003

NFPS QG-S RGE Compression Basis of Design

PRT-HLT-PRC-004

QG Noise Control and Hearing Conservation Standard

3.3 Project Documents (FEED)

S. No

Document Number

Title

200-20-SH-DEC-00011

FEED Noise and Vibration Design Philosophy

200-20-SH-REP-01001

FEED Noise and Vibration Study

200-20-ST-SPC-00011

FEED Living Quarters Architectural Material Specification

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3.4 Project Documents (Detailed Design)

S. No

Document Number

Title

Hold 1

Noise and Vibration Study

200-20-SH-DEC-00004

Environmental Design Philosophy

3.5

International Codes and Standards

S. No

Document Number

Title

ASHRAE HVAC

ASHRAE - HVAC ASHRAE Guidelines

BSI BS EN ISO 2151

BSI BS EN ISO 3744

Acoustics - Noise Test Code for Compressors and Vacuum Pumps - Engineering Method (Grade 2) Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Engineering Methods for an Essentially Free Field over a Reflecting Plane

IMO Resolution MSC.337(91):2012 Code on Noise Levels on Board Ships

ISO 15664:2001

ISO 2631-1:1997

Acoustic control - Design procedures for open plant Mechanical vibration and shock – Evaluation of human exposure to whole-body vibration – Part 1: General requirements

NORSOK S-002:2004

Working Environment

API 521

API 661

EEMUA 104

Pressure-relieving and Depressuring Systems

Petroleum, Petrochemical, and Natural Gas Industries - Air-cooled Heat Exchangers Noise: A guide to information required from equipment vendors

EEMUA 140

Noise Procedure Specification

EEMUA 142

ISO 15665

Noise – Acoustic Insulation Of Pipes, Valves and Flanges Acoustics — Acoustic insulation for pipes, valves and flanges

OSHA 1910.95

Occupational Noise Exposure

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4 NOISE REQUIREMENTS

4.1 Noise & Vibration Objectives

The objectives of noise and vibration management on the NFPS Compression CP6S and CP7S Greenfield and associate Brownfield facilities, are [Ref.3]:

• To prevent hazards to personal health from noise and vibration i.e. risk of hearing damage and

whole-body vibration;

• Ensure that warning/emergency signals are audible over background noise levels;

• Minimise speech interference thereby enhancing communication;

• Maintain working efficiency of all personnel;

• Ensure that an appropriate recreation, relaxation and sleeping environment in living areas is

maintained in order to manage fatigue; and

• Ensure that procured equipment at the facility’s work and living area will not have noise and

vibration levels exceeding the limits defined in this philosophy

4.2 Regulatory Requirements

Offshore facilties in Qatar waters are governed by the Qatari Environment Law on the Protection of the Environment, 2002 [1] and therefore the legally permissible limits for environment noise shall apply. Interpreting the regulations, the environment noise limits are deemed to be applicable for Onshore facilities where noise at the plant boundaries is of importance due the categorization of the exisiting legacy facilties under the Industrial Zone terminology. However for offshore facilities, the clauses of environment noise is deemed as not applicable.

4.3 Noise Exposure Standard

COMPANY Noise Control and Hearing Conservation Program, PRT-HLT-PRC-004 [Ref.3] is identified as the appropriate OH&S document which details the specifics on the occupational noise exposure for all facilities. This program states that the facility operator should not allow a member of the workforce to be exposed to a level of noise that is in excess of equivalent noise level, Leq, 12h of 83 dB(A).

COMPANY guideline on Occupational Noise Management – Noise Control & Hearing Procedure [Ref.3] states (in part) and has been further adapted:

“Noise risk management principles are based on eliminating noise, then reducing noise exposure, in that order. In practice, this means reducing the magnitude of the noise either by elimination or by substitution with low noise equipment and ensuring that the duration a person is exposed to noise is reduced.

Noise exposure should be controlled in the first instance by implementing all reasonably practicable engineering measures, to reduce noise emission. If that does not result in the exposure standard being met, then all reasonably practicable administrative controls should be implemented, to reduce personnel exposure. If the noise exposure limits are not being met, then hearing protectors may be used where it is not reasonable to further reduce noise by engineering or administrative options. Nonetheless, it should be stressed that engineering controls must account for technological and viable options on equipment adaptability, maintenance, accessibility and the minimization of hazards.

Noise Control and Hearing Conservation Program [Ref.3] also make it clear that the corrections for the noise dose as a result of exposure longer than 8 hours up to 12 hours are applicable.

4.4 Noise Limits

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Company specified levels for noise exposure and work place noise levels are principally derived from relevant standards and procedures [Ref.3,15]. Table 4.1 summarizes the noise limits for workplace applied in this Project.

Table 4.1 : Project Noise Limits [Ref.3,5,15]

Project Noise Limit

Company Standard

82 dBA Leq12h

83 dBA Leq12h

Item

Description

General Working Area Noise Level for CPs

Absolute Noise Level

115 dB(A) Outdoor

115 dB(A)

Remark

With respect to Company’s Noise Control and Hearing Conservation Program 83 dBA is the noise limit for an 12 hour TWA exposure.

However, the target of 82 dB(A) limit is set based on the derived permissible limit from OSHA and the COMP2 facilities operates on a 12 hour shift manned. [Ref.22].

Absolute limit anywhere in a work area – personnel will not be permitted to work in the area where noise at this level is present. Sound resulting from emergency noise sources such as atmospheric Process Safety Valves (PSVs) and Flares shall not exceed 115 dBA at reasonably accessible in-plant locations.

4.4.1 General Work Area Limit

The work area is defined as any position not less than 1 metre from equipment surfaces (including piping and valves) accessible to personnel, or any position where a worker’s ear may be exposed to noise in the normal course of duty. Nonetheless, specific attention for cases where a closer operator position at a designated workstation is expected [Ref.13].

As mentioned above in section 4.4, the work area noise limit shall not exceed 82 dB(A) Leq12h for the CPs.

All limits refer to broadband noise without any distinct tonal characteristics. There shall be no tonal noise from all the facility/platforms/equipment noise sources. In the case of tonal noise, further identification by a narrow band analysis shall be done to identify and mitigate the source of noise [Ref.13,15].

Table 4.2 summarizes the noise evaluation criteria adopted for COMP2 facilities. Exposure to above these limits, individual requires hearing protection for the duration of his or her tasks in the sampling area.

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Table 4.2: Time Based Noise Evaluation Criteria [Ref.1]

Intensity of Noise In Decibels (a)

Duration of Allowed Exposure (Hours)

100

105

110

115

0.5

0.25

0.125

Work areas on the facility shall be assessed against 82 dBA criteria for the Compression Platform (designed to be 12-hour shift manned) to allow for consideration for the increased impact to high noise exposure over a longer shift day. This provides a 1dB relaxation to 83 dB(A) for a 12-hour shift and would form a basis of noise limits for work area limit (Ref.4).

Employees should not be exposed to more than 115 dBA unless the employee exposed to noise is provided with ear plugs of the appropriate type [Ref.1].

4.4.2 Absolute Limit

The maximum noise levels shall not exceed 115 dB(A). This limit shall not be exceeded during any normal and abnormal operating conditions including emergencies scenarios irrespective of the duration of the exposure or the use of hearing protection. The unprotected ear shall not be exposed to sound pressure levels which exceeds the absolute limit.

4.4.3 Equipment Noise Limits

In order to reduce work area noises to a level approaching 82 dBA, equipment VENDOR shall guarantee noise levels for equipment packages should be set to no more than 80 dBA at 1-meter distance.

4.5 Noise and Vibration Study

The Noise and Vibration Study shall confirm and verify all sources of noises at the COMP2 facilities. This shall serve as a basis to model and map the noise contours and identify areas of high noises.

The high noise emitting equipment on COMP2 facilities are:

• Gas Turbine Generators

• Gas Turbine Export Compressors

• Cooling Medium Circulation Pumps

• Export Pumps

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• Closed Drain Booster Pumps

• Demineralized Water Transfer Pumps

• Diesel Transfer Pumps

• Export Booster Pumps

• Fresh Water Transfer Pumps

• HVAC and ACCU Unit

• Heli Fuel Package

• Open Drain Oil Pump

• Suction Scrubber Pumps

• Wash Down Pump

• Open Drain Pump

• Pedestal Crane

• AHU

• Vendor equipment packages (Air Compression, Chemical Injection, Air Drier, Service Water

Filter, Sewage Treatment, Water Chlorination)

• Emergency System Noise Sources (Piping Noise due to Compressor Blocked Discharge during PSV Lift, Turbine/Ventilation Inlet, Flare Tip, Emergency Diesel Generator, Firewater Pumps, Blowdown and Depressurizing Systems including PSVs)

Equipment Sound power/pressure levels defined in FEED and vendor noise details available at EPC stage will be adopted into EPC stage Noise and Vibration Study.

4.6 Noise Control Process

Areas and specific equipment items where the noise levels are predicted to exceed the project limits shall be identified in the early project phase. Possible noise controls should be investigated based on technical viability. Where the identified controls are to be implemented and result in a reduction of noise levels below the project limits, no further action is warranted.

4.7 Noise Restricted Areas

Restricted areas are those work areas on the facility where, accounting for industry best practice, it is not reasonably practicable to reduce the noise level at or below the work area limit. The absolute limit remains valid in such areas. If it is unavoidable that the work area limit will be exceeded around particular equipment, action should be taken to limit the area involved as far as is practicable. This may include the erection of an acoustic enclosure, silencer or noise barrier. Areas inside acoustic enclosures around such equipment may be restricted areas [Ref.13].

Permanent warning signs to indicate the mandatory use of hearing protection shall be erected at the boundaries of restricted areas.

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4.8 Noise Level Target in Rooms and Accommodation Areas

Table 4.3 gives a summary of the applicable rooms and accommodation space noise limits. All other areas, other than those defined in Table 4.3 should meet the noise limits of IMO MSC.337(91) [Ref 12].

The target noise levels should encompass the definition of the rooms based on its objective in comparison with a general global limit of the buildings.

Table 4.3 : Accommodation Space Noise Limits [Ref.4,5,12]

Location: Interior Of Living Quarters

Sound Level (dBA)

Executive offices, large conference rooms

Private and semiprivate offices, cafeterias, conference rooms

Sleeping quarters

First aid rooms

General offices, laboratories

Control rooms, manned

Control rooms, not continuously manned

All other Living Quarter areas (except as noted in this Table)

Workshop offices

Routinely, but not continuously occupied areas (e.g., smoking area, personnel shelters)

Utility and storage, switchgear rooms

Workshops, machine rooms

Unmanned Machinery Rooms

Special attention shall be paid to the designated safe heavens and muster areas where the noise levels shall not exceed 70 dB(A) [Ref.5].

The noise contribution from HVAC systems to the above indoor areas should be 10 dBA below the overall room noise limit as stipulated in the Table above. Noise Criteria (NC) Curves corresponding to the noise goals shall be used in the design of the HVAC systems [Ref.9].

For corridors / circulation spaces, the noise limit shall be based on the adjacent rooms noise criteria with a maximum tolrance of 5 dB(A) and a maximum limit of 55 dB(A) [Ref.9,15].

Machinery rooms are unmanned enclosed locations containing noisy mechanical equipment. There should be no regular access ways through unmanned machinery rooms to other workplaces. There shall only be a need for brief stays for inspection purposes while equipment is running.

Internal areas shall be segregated to provide flexibilities for work, recreation, relaxation, sleep and privacy. If possible, low-noise and high-noise areas shall be separated, and high-noise equipment should be located in separate rooms and located away from the accommodation areas.

Special attention is to be made to areas in close proximity to the helideck, particularly on the top level of the LQ due to break-in noise from the helicopters [Ref.11].

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Break-out noise from these rooms through ventilation, combustion or cooling air inlets and outlet shall meet the room noise limit requirements. Cross-talk between the rooms or between rooms and corridors through the ventilation system shall be minimized.

4.9 Acoustic Treatments

For the accommodation areas, offices and control rooms, there should be adequate acoustic insulation between adjacent partitions in order to achieve the noise level targets and for acoustic privacy (ergonomics) [Ref.12]. The goals of acoustic sound reduction between rooms is to be used in conjunction with the noise level targets deliberated in Section 4.8.

Table 4.4 below provides the insulation to be applied between adjacent rooms and partitions [Ref.4]

Table 4.4 : Acoustic Partitions Insulation Requirement [Ref.4,5]

Partitions

Sound Transmission Class (STC)

Bedroom to Bedroom

Corridor to Bedroom

Mechanical Equipment Room to Adjoining Rooms, Bedrooms, and Corridors

Floor to Floor

Bottom Floor, Roof, and Exterior Walls to Interior

40 dB

50 dB

60 dB

For onshore buildings, the rooms should have a minimum sound transmission class of 40 dB between rooms and also from the rooms to the corridors.

Acoustical partitions of the rooms performance (STC or Rw) shall be considered by the selection of appropriate building materials and wall panels. Acoustic dampening can be achieved by optimizing the composite panel structure (i.e. density of panels, acoustic insulation thickness, stud configuration).

Acoustical seals and acoustic doors (either through the door leaf constructions and seals) shall be accounted for during the design process in order to maintain the integrity of the acoustical partition specifically on the rooms which are to be designed with acoustic privacy. Each completed door assembly within external walls shall provide a minimum sound reduction of 44dBA [Ref.6].

Windows (if applicable) would also need to be accounted in the acoustic design (glazed panels). The total window assembly in external walls shall provide a minimum sound reduction of 30dBA [Ref.6].

Construction / Penetrations for the HVAC ductwork shall be closely monitored to ensure the acoustical integrity of the partition and to minimize breakout or flanking transmission between spaces. Possible cross-talk between the rooms to be minimized.

For speech intelligibility, sound reverberation should be under one (1) second for the rooms where communication is of importance. Specific attention is for meeting rooms, control rooms where low background noise levels and communication is of importance.

Suspended acoustic ceiling panels are typically used in the interior design to control sound reverberation and undesirable noise. Noise Reduction Coefficient (NRC) are typically specified for the rooms:

• NRC of 0.50-0.70 for normal offices, auxiliary spaces and general internal work areas/rooms

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• NRC of 0.9-1.05 for cafeterias, mess rooms, gym, conference rooms that require high acoustical

performance, noise reduction and or privacy.

4.10 Noise Abatement Measures

To comply with the required noise limits, noise mitigations measures shall be proposed and applied under CONTRACTOR/ COMPANY approval.

However, preference shall be given to inherent low noise equipment design. Noise mitigation measures such as enclosure, silencer or other miscellaneous acoustic treatment shall be used only if low noise design does not fit with noise objectives under safety, maintenance, accessibility, production loss and performance constraints [Ref.3].

The post-start-up sound level survey shall be reported with grid and isopleth contour maps to represent facility area sound levels. If the post-start-up sound level survey indicates a nonconformance, then a mitigation plan shall be developed.

Sound control treatments shall be designed to permit access to equipment for operations and maintenance and shall minimize impact on machine operation and reliability. The risks associated with potential Corrosion Under Insulation (CUI) concerns created by acoustic insulating systems shall be evaluated and mitigated.

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5 VIBRATION CONTROL REQUIREMENTS

5.1 Objectives

Vibration control is required in order to ensure:

• Acceptable working conditions for all working activities at all working areas;

• Hazard prevention to personnel originated from piping and equipment vibration;

• Vibration Levels induced by piping and equipment is minimized and within the allowable limits;

• Suitable vibration mitigation is defined.

5.2 Topside Vibration Limits (Personnel)

Vibration limits are based on boundaries given in ISO 2631-1 [Ref.14]. The vibrations limits are specified graphically as combined levels for vertical and horizontal movements. The limits cover the range 1 Hz to 80 Hz in which the major body resonance occurs. They shall not be extrapolated beyond this range.

Vibration topsides design shall follow the recommended vibration limits in compressor, utilities and general working area. For COMP2 project, the relevant categories for topsides vibration limits NORSOK S-002 [Ref.15] are:

• Category 3 – Limits for equipment (pumps, compressors, gas turbine generators)

• Category 4 – Limits for vibration locally to equipment

These limits for human exposure in the vertical and horizontal axes are respectively shown on the below figures (extracted from NORSOK S-002 [Ref.15]):

Figure 5-1 : Vibration Limits for Offshore Installation - Horizontal Axes

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Figure 5-2 : Vibration Limits for Offshore Installation - Vertical Axes

5.3 Vibration Limits In Living Quarters

Vibration levels in the accommodation and working spaces during normal operating conditions shall not exceed the values as shown in Figure 5-1 and Figure 5-2.

Vibration levels in the accommodation and technical buildings shall follow the recommended vibration limits during normal operation condition. For COMP2 project, the relevant categories for living quarters vibration limits with respect to NORSOK S-002 [Ref.15] are:

• Category 1 – For Living Accommodation

• Category 2 – Limits for General Work Areas/Central Control Rooms/Telecom Equipment

Room/Radio Room/Electrical Room/Battery Room/Instrument Rack Room

• Category 4 – Limits for vibration locally to equipment on Living Quarters

These limits for human exposure in the vertical and horizontal axes as shown in the Figure 5-1 and Figure 5-2 above.

5.4 Vibration Control

Equipment with potential to transmit significant vibration into the structure and/or noise sensitive locations should be resiliently mounted (using anti-vibration mounts, spring hangers etc.).

Equipment likely to require such detailed consideration include (but are not limited to):

• Reciprocating machines including pumps, diesel engines and compressors

• Large rotating machines (fans, generators, compressors, motors > 200 KW);

• Any machine located in, on or adjacent to the living quarters (including but not limited to HVAC/ extract fans, panel fans and motors, washing machines and dryers, breathing air compressors, generators, pumps, speakers). HVAC Ducting to be designed with anti-vibration spring isolators.

Where vibration isolation is required the means of vibration isolation should provide minimum 90% isolation efficiency and shall be selected such that the resonant frequency of the isolator has minimum 10% frequency separation from machine and structural resonant frequencies.

Special attention to be made on vibrating equipment based on close proximity to the accommodation areas.

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Vibrations from ergonomic such as impulsive noise caused by foot traffic shall be limited to avoid discomfort or annoyance to the LQ occupants. The accommodation areas to be given a priority in terms of the application of this requirement.

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6 NOISE & VIBRATION CONTROL MANAGEMENT

During the detail engineering design phase, CONTRACTOR shall ensure that:

• All the major noise and vibration levels for equipment are specified based on the area limits;

• Sound Power Level Plan is established for the facility;

• Noise Specification for Suppliers is established and included in the inquiries;

• Suppliers submit guaranteed noise level data and prepare the appropriate test procedures for

FAT;

• Acoustic Insulation / Piping Noise requirements are specified;

• Structural vibration analysis is performed for all the areas demarcated to be susceptible to whole

body vibration;

• Detailed noise and vibration study to be carried out and noise and vibration contours are established and updated based on the supplier guaranteed noise and vibration data with noise modelling/mapping study;

• Noise contour mapping shall be conducted if there is any significant change from baseline noise survey. This procedure shall be reviewed at least once every 3 years to ensure relevance and accuracy [Ref.3]; and

• Noise and vibration measurements are conducted during the factory acceptance test for major

equipment.

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Project: Q-21699 - Saipem COMP2 Folder: RFQ Files

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