169976720 015 NH 1104 Rev 1 Plant Equipment Noise Control

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KUWAIT

O L

COMPANY K.S.C.)

Engineering Group

Specification umber

015 NH 1104

Plant/Equipment Noise Control

7 JUL

9 ISSUED

AS KOC ENG GROUP SPEC

o

7 MAR 93

ISSUED FOR

INVITATION TO BID

~ e v

Date

Revilion

By

Chkd Section- PE Client



@ K O C ~

SpecIfIcation Number

015-NH-1104

Rev Date

17-7-94

Sheet

2

of

CONTENTS

1 0

SCOPE

3

2 0

STANDARD SPECIFICATIONS

••

.

• • • •

,

• • • • ,............

3

3 0 SERVICE

CONDITIONS

••

,., • • • •

,

• • • • • • • • • • • • ,'...........

4

4 0

TECHNICAL

REQUIREMENTS

• • • • • • • • • • • • • • • • • • • • •

. • • • • • • .

•

4

4. 1 Definitions .. .. . . ..... . ........ • • • • • • . 4

4 2

Permissible Noise Exposure . . • • • . • • • . • • • . . . • . . . . . . • . . . . 6

4 3

Equipment Noise Data

....•...•....••...•...•••.....••.

8

4 4

Noise Control

. . , . . . . . . . ~ . . .

9

4 5

Noise Measurement Procedure

..••..••..•........••......

9

4 6

Noise Report . •

••

• • • • . .

I • •

10

N12 OOS5



@ K O C ~

Specification Number

016·NH·1104

Rev

1

Date

17-7-94

Sheet

3

of 11

1.0 SCOPE

1

1

This specification covers the minimum requirements for noise and noise

control

of

all equipment required for installation

at

the Facility in Kuwait.

1 2 This specification shall fully comply with all relevant contractual requirements

specified in the Scope of Work and Technical Specification of the Contract.

1 3

The intent of the noise control criteria is to protect the operators from

possible hearing damage. This is based on permanent manning of the main

control room and intermittent patrolling

of

the Facility.

1.4

The intent

of

this specification is

to

limit both occupational and environmental

noise

to

overall Company requirements.

1.5

Due

to

the location

of

the Facility, there are no noise restrictions beyond

battery

limits.

1 6

The word equipment shall include,

but

not be limited to rotating equipment,

vessels, pipework, valves, air coolers, heaters, instrumentation and utilities

and shall encompass all items located

in

the Facility.

2.0 STANDARD SPECIFICATIONS

N12 OO85

2 1

Noise control shall conform in design, materials and performance, except

where otherwise specified, with the current issue and amendments of the

following prevailing on the effective date

of

the Contract:

2 1 1

International Standards

EEMUA

140

EEMUA

141

EEMUA

142

EEMUA

161

2 1 2

British Standards

Noise Procedure Specification

Guide

to

the Use

of

Noise Procedure

Specification

Acoustic Insulation Pipes, Valves and Flanges

Guide

to

the Selection and Assessment

of

Silencers

BS

4196

BS

5969

BS

2475

Guide

to

Selection

of

Methods

of

Measuring Noise

Specification for Sound

level

Meters

1964 Octave and One-third Octave Band

Pass

Filters

>



@KOC=-

Spedflcatlon Number

015-NH-1104

Rev

Date

17-7-94

Sheet

4 of

11

BS 4727

Part 3

BS

3593

Group 08 Acoustic and Electro-Acoustic

Terminology

Recommendations on Preferred Frequencies for

Measurement

2.1.3 Engineering Group Specifications

All equipment and accessories covered by this specification shall

comply with all relevant Engineering Group specifications of which

the following

are

specifically referenced in this specification:

015-AH-1001

015-AH-1002

. 015:-NH-1003

Basic Design Criteria

International Codes

and

Standards

Thermal

and

Acoustic Insulation

2.2 Compliance with this specification shall not relieve the Contractor of its

responsibility

to

supply equipment suited

to

meet the specified service

conditions and applicable regulations.

2.3 Where conflicts exist between the requirementsof this specification

and

other

Drawings, standards codes or specifications, the most stringent shall

be

applied.

3 0

SERVICE

CONDI110NS

3.1 The equipment shall be suitable for continuous operation at a desert location

under high ambient temperatures and humidity. The atmosphere at the

Facility

is

generally dusty and corrosive and may contain traces of hydrogen

sulphide.

3 2 Equipment shall in all respects be suitable for continuous operation in the

service conditions stated in the Engineering Group Specification entitled

Basic Design Criteria (Number 015-AH-1001).

4 0 TECHNICAL REQUIREMENTS

N12·0085

4. 1 Definitions

These definitions

and

units apply to the following text of this specification.

For a more comprehensive list, refer to BS 4727.

4. 1 1 Sound Pressure Level

The following shall be implemented:

a.

l :

Sound Pressura.Level



@ K O C ~


015·NH-1104

Rev

1

17·7·94

5 of

11

N12-OO85

Lp=20 log P/P

o

where

Po

=

2x 1

O-Bpa

b.

Lp d):

Sound Pressure level at

d

metre from the source.

Generally,

d

is assumed to be 1

m,

i.e., [,,(1'

is

sound

pressure level 1 m from source.

4. 1

2

Sound Power Level

Sound Power level shall be quoted in dB .

Lw

= 10 log

Wl.

(W

o

)

b. For sound power level calculation, refer to EEMUA 140

._--

..

_

-

c. The amount of sound energy emitted from an equipment source

which is

a

fixed property irrespective

of

environment.

4.1.3

n

A Weighted Noise Level - LpA [dB(A))

Shall be quoted

as

a single summated noise level.

4. 1 4 Octave Bands

All Lp and

Lw

values quoted are octave band values. The Preferred

Frequencies of

BS

3593 shall be used.

4.1.5 Narrow Band Noise -

Pure

Tone

Where a dominant noise component is audible over a single

frequency or narrow band width. For identification, this may

necessitate using additional frequencies to the octave bands given

in

BS

3593.

4.1.6

Impulsive Noise

Short-duration peak noise levels resulting from mechanical

interactions or transient operations.

4.1.7 Directivity Factor

a.

When sound radiates from a source, sound levels can be higher

in certain directions. This is termed directivity. The directivity

factor is the ratio

of

the increased sound pressure level to the

average sound pressure value.

Or

_



N12-OO85

SpecIfIcation

umber

015·NH·1104

Rav

Data

17-7-94 6 of

11

b. The directivity index expressed in dB is the difference

of

these

sound pressure levels.

4 1 8

Free

Field

For the purposes

of

this specification, a free field

Isan

open area

on

a

flat

surface in which to make measurements,

with

no solid

surfaces In the vicinity to reflect the sound back

to

the

measurement point.

4 1 9

Reverberant Field

An area having near field solid surfaces

that

will reflect noise

resulting in

an

increase in measured noise Jevel.

4 2

Permissible Noise Exposure

4.2.1 Short-duration noise levels which are only expected

to

occur due

to

process upset and emergency conditions shall

be

subject

to

a

maximum limit

of

1., 1) <115 dB linear, i.e., no weighting factor

applied.

4 2 2

Equipment

to

which operator cumulative exposure period is

estimated

to

be

less than

40

hours per week, based on 8 hours per

day.

4 2 3

Equipment

to

which operator cumulative exposure period is

estimated

to

be less than 40 hours per month, based on 2 hours per

day.

4 2 4

Plant Design Noise Levels

a. The Facility shall be designed to provide a normal working

environment limited

to

the maximum acceptable noise level as

specified below.

b. The measured level shall

not

exceed the overall weighted unit,

nor shall the limits set

as

octave band levels below be exceeded

in more than three octave bands, and in any case the level

of

continuous noise exposure shall

not

exceed 90dB A).

c. For design purposes, this l imit shall be reduced

to 87

dB A) in

order

to

provide a margin

of

tolerance.

\

Of



@ I O C ~


Rav

Data

Sheet

015 NH·1104

1

17·7·94 7 of 11

WORK AREAS NOISE LEVEL dB A)

Speech Interference Areas

- Main Control Room 1,, 1}< 55

- Auxiliary Room Office

- Stores/Workshops

Electrical Utilities Areas

- Substation

Lp 1} <65

- DC S u p p l y U P ~ Room

General Work Areas

- Facility·

.

Lp 1)

<Sl-

- Facilities Boundary

Restricted Areas

- Emergency Diesel

1,, 1} <

96

Generator Room

1. Speech Interference Areas

Speech dBA Octave Band Centre Frequency HZ

Interference Level

63

125

250 50

1K 2K 4K

SK

0

Sound Pressure 55

74

66

59

53 50

47

45

Level Limits dB

re 2x10

s

N M2

2. Electrical Util ities Areas

Electrical Utilities dBA Octave

Band

Centre Frequency HZ

Area

63

125

250

500

1K

2K.

4K

SK

Sound Pressure 65 S6

76

69

63 60 59

59

61

Level Limits dB

re

2x

1

O s

N M2

t

t s

N12-OO85



@KOC Grmtl

Speciflcadon Numb

Rev

Date

Sheet

015·NH-1104 1 17-7-94 8

of

11

3.

General Work Areas

General

Work

Area

dBA

Octave Band Centre Frequency HZ

63

125 250 500 1K 2K 4K 8K

Sound Pressure

87 108 98

91

85 82

81

81

83

Level Limits dB

re 2x 10-

6

N/M2

4.

Restricted Work Areas

Restricted Areas dBA Octave Band Centre Frequency HZ

63

125 250 500 1K

2K

4K

8K

Sound Pressure 96

117

107 100 94 91

90 90 92

Levet Limits'dB

- -

- ,

re 2x 10-

6

N/M2

d. These limits shall

be

modified

for

narrow band or impulsive noise

in accordance

with

Table A.

e.

Narrow band

and

Impulsive noise

reduction shall be in

accordance

with

the following table:

TABLE A

Required Reduction

of

Noise Balow Total

Octave

Band

Centre Frequency HZ

63 125 250

500

1K 2K 4K

8K

Reduction for

For Work

0

0

2

6

8 9 9 5

Narrow-band areas

Noise

dB)

Reduction

for

For all

5

5 5 5 5 5 5 5

Impulsive areas

Noise dB)

4.3 Equipment Noise Data

4.3.1

All noise sources must

be

identified, listed and marked on a plot

plan. The Contractor shall determine the acceptable noise level for

each item which will ensure that the Company- specified Fa i l i \

noise levels are met.

,

Nl2..Q085



@IOC Gmup

Spedflcatlon Number

15·NH·l1 4

Rev

1

Date

7·7·94

Sheet

9 of

N12 ()()86

4.3.2 To assist equipment design, the following guideline is suggested.

If

two

machines operate

at

a distance

of

not

more than 5 m from

each, other, the limits shall be reduced

by

a factor of 3dB and, if

three machines operate at the same distance, the limits are reduced

by 5dB.

4.3.3 Noise data sheets must be completed showing required noise level,

Approved Manufacturer s predicted noise level and attenuation

needed to meet specification.

4.3.4

The Contractor shall review the need for noise attenuation as part

of

an overall noise control strategy.

4.3.5 The Contractor s intended noise control strategy shall be submitted

to

the Company for approval. A list of all noise sources must be

provided with the expected noise level, required attenuation and

. method

9f

nois e control proposed.

4.3.6 The Contractor must clearly show the summation effect of all the

individual noise sources to demonstrate its adherence

to

the

. specification.

4.4

Noise Control

4.4.1 Noise control measures shall be of long life, low maintenance, and

robust construction to withstand frequent dismantling.

4.4.2

Where removal is needed for maintenance access, ease

of

rapid

removal and reassembly is required.

4.4.3

Facilities required for normal operation shall not be impeded.

4.4.4

Enclosures must not be a danger

to

health and operational safety.

4.5

Noise Measurement Procedure

4.5.1 Noise tests shall be required

to

be undertaken as part of

the

general

acceptance tests at the Company-Approved Manufacturer s Works,

or other suitable location, for all major noise producing items

of

the

Facility.

4.5.2 Noise tests shall be conducted in accordance with the procedures

detailed in EEMUA 140 using precision grade sound level

measuring equipment in compliance with BS 4197 instrument

measurements. BS 4197 instrument Type 2 may be allowable

subject

to

prior approval by the Company. Calibration certificates

shall

be

available

for

Inspection

at

the time

of the

test.



@ K O C ~

Spaclflcatlon umber

016-NH-11

04

Rev

1

Date

17-7-94

10 of

11

N12-0085

4 5 3 The Company reserves the right

to

witness noise tests

and

should

be

notified at least five days

in

advance

of

the proposed date

of

any

such test. The Company may nominate its third-party inspector or

an authorised inspector to attend on its behalf.

4 5 4 Noise measurements shall be made in free field conditions with

background noise levels at least

10dS below the equipment noise

level at the measuring positions. Any significant departure from

these conditions shall be noted In the test report. Where it is

possible

to

calculate the correction

to

be made

to

the measured

level to compensate for reverberant conditions or background noise,

such corrections shall be fully detailed in the test report. Where the

background noise level

is

less than

3dB

below the equipment noise

level in any octave band, then the ambient conditions are excessive

and the location shall be considered unacceptable for testing,

except

as

referenced in Section 4.5.5.

4.5.5 Where the requirements of Section 4 5 4 cannot be met, then the

Contractor shall use an independent acoustic consultant to

undertake the Noise Measurements In Accordance with Section

2 4

of EEMUA

140. Evaluation

of

compliance

with

Contract noise

limits shall be

based

on the calculated sound power level of the

equipment obtained by this procedure. The Contractor shall include

area

correction factors,

as

required by this method in its test

procedure required by paragraph 4.5.6. These will

be

subject

to

prior approval by the Company.

4 5 6 The Contractor shall submit a test procedure for the Company s

approval detailing the measurement procedure.

4 6 Noise Report

4.6.1 The Contractor shall submit a total

of

three reports

to

the

Company:

a The initial report shall indicate all predicted individual noises in

the Facility. It shall detail all measures

to

curtail estimated

noise, along with the resultant levels.

b After vendor information has been received and confirmed, the

second report shall show the total accumulated noise that the

Facility shall produce. Equipment reports shall be included and

be

in accordance with Section 4.6.2. A plot plan should also be

presented at this stage, locating all sources of noise in the

Facility. It shall show that the Facility will comply with the

allowable Facility noise level.

c. The final report shall specify the actual noise that the Facility

\x

produces when it is operating. The Contractor shall make these. )

f)fo

\ {j




016-NH-1104

Rev

Date

17-7-94

Sheet

11 of 11

noise measurements

and

provide suitable measuring equipment

for this purpose.

4.6.2 For individual pieces

of

equipment a written test report shall

be

submitted

to

the Company within

two

weeks

of

completion of the

test and should contain the following information:

a. Details

of

all measurement equipment

used

including calibration

certification details.

b. All measurements taken including background noise levels with

the equipment under test not operating.

c. Details

of

all calculations and corrections made to recorded

measurements.

d. Details

of

any tonal impulsive or directional characteristics

•

e.

A dimensioned sketch

of

the test

area and

equipment layout

showing any structures or other equipment in the immediate

vicinity.

f. Operating conditions

of

the equipment under test.

g.

Details

of

any standard or other noise control features fitted

to

the equipment during the test.

h. A description

of

any other factors that may have affected the

data presented.

4.6.3 In exceptional cases a separate performance acceptance test may

be

required for major noise control items where these cannot

be

tested in conjunction with the equipment to which they are to be

fitted.

The

requirements

of

sections 4.5

and

4 6 shall apply.

Documents

169976720 015 NH 1104 Rev 1 Plant Equipment Noise Control