1. SCOPE ………………………………………………………………………….2. REFERENCES 3
3. DEFINITIONS 3
4. GENERAL REQUIREMENTS …………………………………………..5. REGULATORY NOISE LIMITS 5.1 Facility Noise Limits 5.2 Community Noise Limits ……………………………………………..6. NOISE LEVEL CONTOUR MAPS 6.1 Theoretical Noise Level Contour Maps 6.2 Actual Noise Contour Maps …………………………………………6.3 Boundaries / Markings
7. EQUIPMENT NOISE TEST 7.1 Test Procedure …………………………………………………………..7.2 Test Instruments 7.3 Seller / Buyer Responsibility 7.4 Certification Requirements and Guarantees …………………..7.5 Cost Benefit Analysis 8. NOISE CONTROL MEASURES 8.1 General …………………………………………………………………….8.2 Substitution 8.3 Vibration 8.4 Reducing Sound Transmission through Solids ……………….8.5 Reducing Sound Produced by Air or Gases 8.6 Placement of Equipment and Sound Absorbing Materials 8.7 Enclosures ………………………………………………………………..8.8 Acoustic Insulation
FIGURE
1
APPENDIX
A Sample Equipment Noise Data Form………………………………….B Sample Equipment Noise Test Report
1. Scope
1.1 This specification defines the permissible noise levels which shall apply during plant operation and
also establishes guidelines for Contractors and Vendors with regard to complying with noise level limits forequipment. Equipment requirements and Vendor and Contractor responsibilities are detailed in Section 5
and 6 with specific noise control measures addressed in Sections 7 and 8.
1.2 The operating noise level from all combined sources shall be within the prescribed noise level and
duration limits.
1.3 This specification also covers the general requirements for the design and materials for the acoustic
insulation of piping and large equipment.
1.4 In case of conflict between specification, codes and standards in the absence of written clarification,
the more stringent requirement shall govern.
2. References
Reference is made in this standard to the following documents. The latest issues, amendments, and
supplements to these documents shall apply unless otherwise indicated.
SABIC Engineering Standards (SES)
Z01-G04 Measurement Units for Use in SABIC Projects
American National Standards Institute / Acoustical Society of America (ANSI / ASA)
ANSI S1.4/ASA 47 Specification for Sound Level Meters
ANSI S1.13/ASA 118 Measurement of Sound Pressure Levels in Air
ANSI S2.40/ASA 50 Requirements for Measure Vibration Severity of Mechanical Vibration of Rotating and
Reciprocating Machinery
ANSI S12.1/ASA 49 Guidelines for Preparation of Standard Procedures to Determine the Noise Emission
from Sources
ANSI S12.3/ASA 57 Statistical Methods for Determining and Verifying Stated Noise Emission Values of
Machinery and Equipment
American Petroleum Institute (API)
615 Sound Control of Mechanical Equipment for Refinery Services
American Society for Testing and Materials (ASTM)
C 1014 Standard Specification for Spray-applied Mineral Fiber Thermal or Acoustical Insulation
C 1071 Standard Specification for Thermal and Acoustical Insulation
C 795 Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel.
Institute of Electrical and Electronic Engineers (IEEE)
C85 Test Procedure for Airborne Sound Measurements on Rotating Electrical Machinery
Instrument Society of America (ISA)
S75.07 Laboratory Measurement of Aerodynamic Noise Generated by Control Valves
Occupational Safety and Health Administration (OSHA)
29CFR 1910.95 Occupational Noise Exposure (normal workplace)
29CFR 1926.52 Occupational Noise Exposure (construction)
Noise Control A Guide For Workers and Employers
Royal Commission Environmental Regulations
Consultation Document Environmental Noise Standards and Regulations
3. Definitions
For the purpose of understanding this standard, the following definitions apply.
A-weighted. “A-weighted” means a specific weighting of the sound pressure level for the purpose of
determining the human response to sound. The specific weighting characteristics and tolerances are
those given in American National Standards Institute SI.4-1983, section 5.I.
dBA. dBA means a unit of sound level expressed in decibels (dB) and A-weighted. The A-weighted sound
level is also called the noise level. Sound level meters have an A-weighting network for measuring
A-weighted sound level.
Ambient Noise. The total of all noise in the environment, other than the noise from the source of interest.
This term is used interchangeably with background noise.
Attenuation. The reduction of sound by various means.
Broad-band Noise. Noise with components over a wide range of frequencies.
Octave Band Level. The integrated sound pressure level of only those sine-wave components in a
specified octave band.
Impulsive Noise. “Impulsive noise” means either a single sound pressure peak (with either a rise time less
than 200 milliseconds or total duration less than 200 milliseconds) or multiple sound pressure peaks (with
either rise times less than 200 milliseconds) spaced at least by 200 milliseconds pauses.
Sound Level. The weighted sound pressure level obtained by the use of a sound level meter and
frequency weighting network, such as A, B, or C as specified in ANSI specifications for sound level meters
(ANSI-SI.4-1971, or the latest approved revision). If the frequency weighting used is not indicated, the
A-weighting is implied.
Sound Level Meter (Type I, Type II, Type III). Three types of sound level meters differing in their
performance requirements, with the requirements being most strict for the Type I or “Precision” Sound
Level Meter, and progressively less strict for the Types II and III. Type I is commonly referred to as a
“General Purpose” Sound Level Meter, and Type III a “Survey” Sound Level Meter. Typically all three types
provide A, B, and C weighted network responses. The Type I, or Precision instrument, is widely used in the
laboratory where conditions can be carefully controlled and the accuracy of the instrument can be fully
used. Because some Type I instruments are readily portable and easy to use, they are also widely used for
field measurements.
Sound Pressure Level. “Sound pressure level,” in decibels, means 20 times the logarithm to be the base
10 of the ratio of the pressure to the reference pressure. The reference pressure shall be 20 micronewtons
per square meter.
4. General Requirements
4.1 The engineering contractor shall analyze the noise level projected to be generated from piping,
instruments and process equipment to assure that the final process piping configuration will not exceed the
specified noise level when the process is in operation at design rates.
4.2 Contractor shall guarantee the equipment noise levels specified in this Specification.
4.3 Contractor shall be responsible for compliance to the applicable regulations and laws specified in this
Specification.
4.4 Abatement designs shall not limit equipment operation or accessibility, nor shall they create any safety
or fire hazards.
4.5 Any remedial work performed either by Contractor or Vendor as a result of Vendor’s failure to meet the
guaranteed noise level shall be at the expense of the Contractor.
4.6 It is the responsibility of the vendor to provide equipment maintenance manuals with recommendations
as applicable for replacement or adjustment of worn and loose or unbalanced parts of machines,
lubrication of machine parts and use of cutting oils, proper methods for sharpening cutting tools.
5. Regulatory Noise Limits
5.1 Facility Noise Limits
5.1.1 Employee Exposure Limits
a. Suppliers of equipment including that in package units, shall provide information on the maximum
sound level that the equipment will operate at and ensure compliance with the values listed in the
specification. If a sound pressure level exceeding 85 dBA at a distance of one meter is predicted, the contractor or the project management shall advise the owner in writing prior to supply of the
equipment.
b. The equipment (or equipment layout) broad-band noise shall not exceed employee exposure
limits of 85 dBA for employees working 8-hour shifts, 40-hour work weeks.
c. The absolute sound level limit for noise except impulsive or impact noise shall be 100 dBA in any
area in which workers may be present.
5.1.2 Equipment Noise Level Limits
5.1.2.1 To ensure plant noise level does not exceed 85 dBA, the maximum sound pressure levels for
equipment rated to operate at 85 dBA shall be as follows:
a. The SPL must be given in each of the nine octave bands centered 31.5 Hz to 8k Hz, and the
overall noise levels in dBA.
5.1.2.2 For control valves, only overall sound level of 85 dBA shall be applied.
5.1.2.3 The sound level is determined by a minimum of 6 measurements taken at 1 meter from the
equipment at points evenly spaced around the equipment and at 1/2 the equipment height as determined
by major surfaces.
5.1.2.4 The overall sound pressure level dBA value for any equipment item shall be limited to 85 dBA at
one meter distance. Neither the overall sound pressure level nor the octave band level shall be exceeded.
5.1.2.5 When equipment is supplied with gear unit, equipment noise level limits shall be applied to the
combined noise level for the equipment and gear unit.
5.1.2.6 Vendor shall provide the expected noise level for each equipment by completing and submitting to
Purchaser the “equipment noise data sheet” shown in Attachment
5.1.2.7 Calculated dBA and octave band SPLs may be accepted where actual measurements are not
possible by showing the method of calculation.
5.1.2.8 For large noise sources, the Sound Power Level (SWL, dB re 10-12 Watt) and its calculation
method from appropriate SPL measurements (or basic formula where SPL measurements can not be
made) must be given.
5.1.2.9 Whenever the sound pressure level of Vendor’s standard equipment exceeds the limit specified in
Table 2, special design shall be selected and the Vendor shall complete the data sheet accordingly and
provide the following information:
a. Noise level of special design.
b. Noise reduction method to be applied for special design.
c. Noise level treatments incorporated in the actual installation.
5.1.2.10 Noise control measures applied to equipment shall not interfere with the operation, efficiency,
safety or running maintenance of the equipment.
5.2 Community Noise Limits
5.2.1 The owner’s property fenceline is the location for evaluating project related noise impact, on the
community.
5.2.2 Ambient Noise – Steady-state noise levels from the project’s operation, measured outside the owner
site fenceline shall not exceed 75dBA.
6. Noise Level Contour Maps
The following maps shall be prepared:
a. Theoretical Noise Level Contour of the plant, i.e., level of noise expected during operations or
upset conditions by contractor during Plot Plan Development
b. Actual Noise Contour Maps:
(i) Background Noise Level Map of the plant site during Basic Engineering, and
(ii) Actual Noise Contour Maps for the plant during operations
6.1 Theoretical Noise Level Contour Maps
6.1.1 Since the suppliers provide only the noise data for an individual equipment, the combined effect of all
equipment noise is unknown and shall be predicted to determine the area noise levels for the facility.
6.1.2 The theoretical noise level contour diagram (stated above) shall be produced based on the
equipment sound power levels, which represent the total energy emission of the noise sources. Noise
generated by small valves, piping, heat exchangers and other small equipment or instruments shall be
accounted for by a designated “floor noise” level.
6.1.3 Data required for the noise level contour modeling are, but not limited to, the plot plan (equipment
location and elevation), equipment list and electrical load (equipment sound power level), and
building/barrier configurations.
6.2 Actual Noise Contour Maps
6.2.1 Background Noise Level Map of the plant site during Basic Engineering shall be conducted to
develop a baseline of the area. For existing facilities, perimeter noise levels from existing units or plant
equipment shall be identified and reviewed for potential impact to the “floor noise” level.
6.2.2 Following the startup of plant facilities, noise survey shall be conducted at rated plant operation, and
an actual noise contour map shall be developed to verify the extent of conformity to the performance
guarantee.
6.2.3 Contractor shall have the responsibility for implementing remedial measures to bring the noise level
within the performance guarantee.
6.3 Boundaries / Markings
The noise contour map will identify potentially excessive high noise areas in the project facility and proper
administrative measures shall be taken to protect the workers, such as classified as a noise hazard area
and clearly marked with warning signs.
7. Equipment Noise Test
7.1 Test Procedure
7.1.1 Vendor shall conduct a noise test of equipment prior to shipment and submit to Purchaser the
“Equipment Noise Test Report” shown in Attachment 2. If not applicable, noise test may be performed
during commissioning operation of the equipment.
7.1.2 Measurement of sound pressure level in dBA will be stated for each of the nine frequency bands
centered on 31.5, 63, 125, 250, 500, 1k, 2k, 4k, and 8k Hz together with the overall noise level in dBA.
a. The background noise shall be measured before the test. If the background noise levels are
within 9 dB of test levels, corrections to test data shall be made to account for background noise. No
valid measurements can be made when the background noise is less than 3 dB below measurement
test levels.
b. Noise tests shall be performed with the equipment operating at rated speed and/or rated power.
If this operating condition cannot be obtained, then noise tests may be performed at different
condition which shall be clearly described by Vendor in advance.
c. The placement of the instruments during the test shall be such as to avoid the influences of air
currents, vibrations, electrical or magnetic field and other extraneous factors which tend to alter the
readings.
d. Where equipment is located inside an enclosure furnished by the Seller, the sound limit applies
at a distance of one (1) meter from the outside surface of the enclosure. When the equipment, piping,
or duct is insulated, the sound limit applies at a distance of one (1) meter from the surface of the
insulation.
e. Measurements shall be taken at a minimum of six positions spaced equally around and at 1
meter from the equipment and at 1/2 the equipment height as determined by major surfaces. The
values of all readings shall be reported.
f. In cases where the sound pressure levels fluctuate, the average shall be recorded. If however,
the range of fluctuations is more than 6 dB the maximum and minimum shall be recorded also, and a
level of 3 dB below the maximum shall be stated for design purposes.
7.2 Test Instruments
7.2.1 A sound level meter as specified in ANSI S1.4 with a measurement range between 80 dBA and 140
dBA with a pulse range of at least 63 dBA or equivalent is to be used to measure overall noise level in
dBA. The measurement device shall be set for use on the A- weighted network with slow meter response.
7.2.2 Instruments shall be calibrated as recommended by the instrument manufacturer. Overall calibration
of the instruments, including the microphone and internal calibration of the meters, shall be made before
and after the measurement test. If the difference between the two calibrations exceeds 2dB, the test shall
be repeated.
7.3 Seller / Buyer Responsibility
7.3.1 Requests for quotations shall specify maximum permissible sound level limits of equipment as a
tabulation of sound power level, LW (ref 10 -12 watts), or as sound pressure level, LP (ref 20
micropascals).
7.3.2 Purchase orders shall specify maximum sound level limits of equipment as guaranteed by the Seller.
7.3.3 Seller shall state in his proposal any exceptions or deviations to this specification.
7.4 Certification Requirements And Guarantees
7.4.1 Seller shall complete the Buyer’s Equipment Noise Data, Attachment I and Equipment Noise Test
Report, Attachment II, and shall submit them to the Buyer with Seller’s quotation and signed guarantee.
When sound pressure levels are requested and sound power levels are also available, this information
should be included in the report. When equipment is motor driven, data for both driven and driving
equipment shall be submitted.
7.4.2 Requests for quotations shall designate the Seller’s Equipment Sound Level maximum permissible
sound level limits on the purchase order and in the equipment specifications.
7.5 Cost Benefit Analysis
7.5.1 When the Buyer’s requirements cannot be satisfied by the Seller’s standard design, alternatives for
special design or for acoustical treatment of standard design shall be quoted.
7.5.2 When a special design or an alternative acoustical treatment is quoted by the Seller, the proposal
shall contain all pertinent design details, cost, and effect on performance, if any.
7.5.3 The “standard design” means standard product furnished by the Seller. Where more than one (1)
product is standard, the one that comes closest to meeting the Buyer’s sound requirements shall be bid as
the standard design. A “special design” means modification of a standard design that meets the Buyer’s
requirements, or, if those requirements cannot be met, as close to meeting those requirements as
practicable. If the Seller believes the special design has an undue impact on cost, operation, or
maintenance, an acoustical treatment shall also be bid. The “acoustical treatment” means modification of a
standard design that comes as close as practicable to meeting the Buyer’s requirements.
8. Noise Control Measures
8.1 General
8.1.1 Noise controls may be accomplished through measures at the source (orientation, vibration, vibration
control, etc.), installation of acoustical shields, enclosures, or other barriers to interrupt the path of the
sound.
8.1.2 Where practical and economical, reductions of excess noise shall be achieved by changes in unit or
component design and in this respect, vendor’s proposals for such changes will be given consideration.
8.1.3 Features applied to items of plant or equipment for the purpose of reducing noise, whether it be by
design change or by any other method, shall not interfere with or be to the detriment of safe, efficient
operation and running maintenance of the item concerned nor should such features in themselves
constitute or create a hazard to safety in any way.
8.2 Substitution
The best means of controlling sound generation is to choose inherently “less noisy” or quiet machines or
processes. Generally machinery is designed with performance in mind, and to change internal components
to reduce noise also can reduce efficiency. However, one machine type or design can often be substituted
for another often in the original design as illustrated below:
a. Larger, slower machines for smaller, faster ones
b. Step dies for single-operation dies
c. Presses for hammers
d. Rotating shears for square shears
e. Hydraulic for mechanical presses
f. Belt drive for gears
In addition to substitution of machinery, consideration shall be given to substitution of processes as
illustrated below:
a. Compression for impact riveting
b. Welding for riveting
c. Hot for cold working
d. Pressing for rolling or forging
8.3 Vibration
Isolation. Airborne noise generated by a vibrating part generally can be reduced by isolating this part from
the rest of the structure or machine. The simplest isolating device is a flexible support that reduces the
magnitude of the force that would be transmitted to the structure or machine. By the same token, an
isolator may reduce the amplitude transmitted from a vibrating support to a part of the machine generating
excess noise.
Damping. Vibrating parts have certain resonant frequencies. When an exiting force has the same
frequency as the resonant frequency of that part, the amplitude will be limited only by the amount of
damping in the system. Noise generated by this resonant part can be reduced by increasing the damping in
the system.
In the absence of all damping, the amplitude of a vibrating part will go to infinity. Of course, there is always
some damping in all systems. Adjustment of this damping is one of the most important factors in vibration
and noise control.
Where vibration may be a potential noise source, the following shall be considered in the design:
a. Reducing the forces
b. Minimizing the rotational speed
c. Isolating
d. Damping
e. Providing additional support
f. Increasing the stiffness of the material
g. Increasing the mass of vibrating members
h. Changing size to change the resonance frequency
Radiating sound from vibrating surfaces can be reduced by:
a. Reducing the radiating area
b. Reducing the overall size
c. Perforating surfaces
8.4 Reducing Sound Transmission through Solids
The vibration in solids often causes airborne sound. In piping the turbulent fluid flowing within transmits
sound through the solid pipe. Sound is transmitted through a solid barrier by forced vibration of the wall
caused by sound waves striking the surface. The heavier, more rigid, and more air-tight the barrier is, the
more resistant it is to sound transmission. Sound transmission can be reduced through solids by
considering the following:
a. Flexible mountings
b. Flexible sections in pipe runs
c. Flexible-shaft couplings
d. Fabric sections in ducts
e. Resilient flooring
8.5 Reducing Sound Produced by Air or Gases
Sound produced by air or gases can be from turbulence, the result of a flowing gas mixing with a
non-flowing gas, outflow speeds, or wind tones. The following shall be considered in the design to reduce
the sound produced by gas or air flow:
a. Providing intake and exhaust mufflers
b. Choosing fan blades designed to reduce turbulence
c. Using Large, low-speed fans for smaller high-speed fans
d. Reducing the velocity of the fluid/air flow (reduced outflow speed)
e. Increasing the cross section of streams
f. Reducing the pressure
g. Reducing air turbulence for jet streams by providing an air stream with a lower speed outside the
jet stream
h. Converting low frequency jet noise to high frequency noise by providing a diffuser and packing.
i. Eliminating wind tones by making an object longer in the direction of flow, such as with a “tail”, or
by making the object’s shape irregular (e.g., spiraling a strip of sheet metal around a smoke stack)
8.6 Placement of Equipment and Sound Absorbing Materials
The closer to reflecting surfaces a sound source is placed, the greater the noise it will radiate to a given
distance. The worst placement in a room or building is in corners near three surfaces. The best placement
is away from the walls. Transmission of noise in a room can be reduced by considering the following
measures:
a. Using sound absorptive material on walls and ceiling in working areas
b. Using sound absorption along the transmission path
c. Enclosing individual pieces of equipment
d. Use of baffles
e. Confining high-noise machines to insulated rooms
8.7 Enclosures
When a large amount of noise reduction is required, an acoustic enclosure can be considered as a direct
solution. The enclosure serves as a noise barrier that completely encloses a machine and shall be
designed such that its resonant frequency and the noise frequency of concern do not coincide.
Acoustic enclosures will be accepted for noise control after prior agreement with the purchaser.
a. If an acoustic enclosure is proposed for reducing the noise from an item of equipment, an outline
design shall be prepared at an early stage in the design. This shall be sized to take into account any
requirements for fire precautions, purging or ventilation operation and running maintenance. It shall be
prepared even in marginal cases where a final decision on installing the enclosure will not be made
until the equipment is tested at site. This is to ensure that the plant is designed with adequate space
for a possible enclosure.
b. Acoustic enclosures shall be constructed so that they can be dismantled and reassembled
repeatedly at site, without affecting their acoustic properties.
c. Where walk-in enclosures are installed, they shall be designed with acoustically absorbent
internal surfaces to reduce the internal noise levels. All access doors shall be fitted with panic catches,
and their internal faces painted with a distinctive color. Internal lighting shall be provided, but shall not
be supported by or connected to dismountable parts of enclosures.
d. The necessity of operator access within acoustic enclosures shall be minimized. Wherever
possible, indicators and controls shall be installed outside enclosures. Where this is not possible, local
indicators, etc., shall be grouped together and a window installed in the enclosure so that they may be
read without entering the enclosure. Illumination shall be provided for these indicators, and shall not
be supported by or connected to removable enclosures.
8.8 Acoustic Insulation
Unless otherwise specified, acoustic insulation shall be applied with owner approval, to the main piping
connected to the equipment whose noise level will be greater than 85 dBA at a distance of one meter from
the equipment. The extent of provision of the acoustic insulation shall be shown on the P&I D.
8.8.1 Types of Acoustic Insulation
a. Types of acoustic insulation for piping are indicated in the following table and Figure 1 and
designated as (S1), (S2), (S3), and (S4) in the P&I D in the close proximity to the legend for piping
material classification or thermal insulation classification.
b. All flanges and valves shall be insulated to the same type as the pipe connected to them.
8.8.2 Acoustic Insulation for Hot or Cold Service
a. The thermal insulation for cold service shall be applied first to the pipe and the acoustic
insulation shall be applied on top or outside. The thickness of the thermal insulation layer shall be
designed in accordance with service intended.
b. Where acoustic insulation is applied in conjunction with the thermal insulation for hot service, thmaterial for acoustic insulation shall be preferred and the thickness of the insulation layer shall bedetermined by the more stringent of the two requirements.
8.8.3 Acoustic Insulation Materials
Acoustic insulation material consists of a sound absorbing material and a sound barrier material.
8.8.3.1 Sound Absorbing Material
Specification and application of the sound absorbing material shall be as follows:
8.8.3.2 Sound Barrier Material
Sound barrier material shall be lead sheet with a minimum mass of 5 kg/m3.
8.8.4 Large Equipment Acoustical Blanket Insulation
This specification is for acoustical blanket insulation for steam turbines. It is also applicable for quieting
compressors, valves, gear boxes, etc. This insulation is similar to thermal blanket insulation which is
placed on equipment, but with a noise barrier added to the outside jacket. The insulation shall be as
specified in 8.8.4.1 and 8.8.4.2 below.
8.8.4.1 Service
This acoustical insulation shall be used on equipment with surface temperatures not exceeding 230 C. For
higher temperature service, a fiberglass mat enclosed in knitted stainless steel wire mesh should be used
under the acoustical insulation.
8.8.4.2 Design Component
a. Outer Jacket: 0.6 kg/m2 (17 oz/yard2) teflon impregnated fiberglass cloth.
b. Noise Barrier: 3.7 kg/m2 (0.75 lb/ft2) loaded vinyl faced with tightly woven fiberglass cloth.
c. Insulation: 175 kg/m3 (11 lb/ft3) fiberglass needled mat, 25 cm or 50 cm thick.
d. Inner Jacket: 0.6 kg/m2 (17 oz/yard2) teflon impregnated fiberglass cloth.
e. Lacing: The blanket shall be fitted with stainless steel type 304 lacing pins and wire twists for
attaching the blanket sections over the equipment.
8.8.4.3 Fabrication Requirements
a. The blanket shall be of strong, durable construction, with no rawcut edges, suitable for
continuous indoor or outdoor use.
b. Each blanket section shall have an embossed or etched lettering tag giving location, description,
and installation sequence number.
c. Stainless steel tufts or pins shall be placed at distances of no greater than 18 inches (45 cm) to
hold the fiberglass in place.
d. Blanket shall conform to equipment surface with minimal air voids.
e. The insulation shall cover as much of the turbine casing as possible, with a minimum coverage of
at least 85 percent of the casing surface.
Figure 1
Sample Equipment Noise Data Form
Company will complete the items listed for permissible equipment sound pressure. The basis for sound
level measurement shall comply with the use of the octave band analyzer in accordance with ANSI S1.4
and S1.11, and procedures shall be in accordance with ANSI S1.13, S1.31, S1.32, S1.33, S1.34, S1.35
and S1.36.
Sample Equipment Noise Test Report
Company will complete the items listed for permissible equipment sound pressure. The basis for sound
level measurement shall comply with the use of the octave band analyzer in accordance with ANSI S1.4
and S1.11 and procedures in accordance with ANSI S1.13, S1.31, S1.32, S1.33, S1.34, S1.35 and S1.36.
Prior to a sound level test, the tester shall prepare a sketch (see next page) showing the location and
elevation of the microphone and the position of the equipment as placed in the room or field space.
Sample Equipment Noise Test Report
