Some standard content:
ICS 17.140
National Standard of the People's Republic of China
GB/T 20430—2006/IS0 15664:2001Acoustics
Noise control design procedures for open plant(IS0 15664:2001, IDT)
070117000028
2006-07-25 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2006-12-01 Implementation
Normative references
Terms and definitions
General requirements
General noise limits (exposure requirements)
Equipment noise limits (noise emission requirements) Noise reduction equipment
Project control
Appendix A (Informative Appendix)
Appendix B (Informative Appendix)
Appendix ((Informative Appendix))
Appendix D (Informative Appendix)| |tt||Appendix E (Informative)
Appendix F (Informative)
Appendix (Informative)
Appendix H (Informative)
Appendix I (Informative)
References
Noise Control Process
Overview of Implementation Project and Responsibility Sharing
Information to be included in the technical requirements
Noise of Specific Equipment
Example of Equipment Noise Data Table
Documents for Noise Control Engineers
Example of Noise Source Distribution Report Format
Example of Noise Control Report Format,
Example of Noise Verification Report Format
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GB/T 20430-—2006/ISO 15664:2001Ⅲ
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GB/T20430—2006/IS015664;2001This standard is equivalent to ISO15664:2001 "Noise control design code for open workshops". In the process of equivalently adopting IS015664:2001, this standard replaces some 1S0 standards in its normative references and references with corresponding valid national standards, and adds GI3/ T3102-71993 "Quantities and Units of Acoustics" and GB/T3947-1996 "Terms of Acoustics", and have been revised. This standard is proposed by the Chinese Academy of Sciences.
This standard is proposed by the National Technical Committee for Acoustics (SAC/TC17) and is under the jurisdiction of ILI. The drafting units of this standard are: Institute of Acoustics, University of International Business and Economics, Institute of Acoustics, Chinese Academy of Sciences, and China Machinery International Engineering Design Institute. The main initiators of this standard are: Mao Dongxing, Lv Yadong, Zhang Jianhua, Yu Wuzhou, Xu Xin, and Chen Xiaoming. GB/T 20430-2006/1SO 15664:2001 Introduction
This standard specifies open plants, including refineries, chemical plants, gas plants, and unclosed power plants! , steel mills, gravel washing plants, cement plants, finished concrete plants, and other open plants that operate continuously, in batches, or intermittently. This standard is applicable to the design of new plants and the renovation and expansion of existing plants. This standard is based on the experience in the design, construction, operation, and maintenance of plant facilities, and specifies the main technical content and steps to be followed in the successful design of industrial noise control. Users of this standard should be familiar with the type of plant involved and have sufficient technical ability and experience in industrial room noise control design. This standard strives to adapt to the nature and layout of the plant to be designed, as well as the technical capabilities of the parties involved. When this standard conflicts with any local regulations, the local regulations shall be followed. This standard specifically clarifies that the end user and the contractor shall jointly agree on the work and work reports to be completed in the noise control design, as well as the nature and content of the work undertaken by each party.
This standard is not intended to be a detailed contract document, but Appendix B and the additional requirements proposed separately may constitute part of the contract between the end user and the contractor.
This standard is not suitable for reference in the procurement technical parameters (requirements) of individual equipment, because the content it involves is usually beyond the responsibility of the supplier of individual equipment.
Some standards related to this standard are listed in the references. 1 Scope
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CB/T 20430—2006/ISO 15664:2001 Acoustics Noise control design code for open-type plants. This standard specifies the noise control design procedures and steps for most open-type plants. This standard applies to the following situations:
Technical requirements for noise control steps in the renovation and expansion of new or existing factories (the construction steps of noise control are not within the scope of this standard, but should be considered)
The provisions of the responsibilities of the parties, namely the respective responsibilities of the "end user", "contractor" and "equipment supplier". Based on the overall noise requirements of the factory, describe the general steps that a single piece of equipment needs to meet the noise requirements. Appendix A gives a noise control process flow chart, and Appendix B gives a list of noise control implementation items. Note: Specific engineering methods for factory acoustic design and analysis should refer to other standards and books. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions apply to this standard. GB2893-2001 Safety color (neqISO 3864:1984) GB2894-1996 Safety signs (ncq ISO3864:1984) GB3102.7-1993 Acoustic quantities and units (egv ISO 31-7:1992) GB/T3947-1996 Acoustic terminology
GB/T3222.1-2006 Description, measurement and evaluation of acoustic environmental noise Part 1: Basic parameters and evaluation methods (idt IS0 1996-1:2003)
ISO1996-2Acoustic environment Description, measurement and evaluation of noise Part 2, Data collection related to site use 3 Terms and definitions
GB3102.7-1993, GB/T3947-1996 and the following terms and definitions apply to this standard. 3.1 General terms
End-user
The party that first proposes the project construction and ultimately owns or operates the plant or pays for the design and construction of the plant. Note: The end user usually determines the technical specifications of the project. 3.1.2
Contractor
Party that undertakes part or all of the design, engineering, procurement, construction and agency of the project. 3.1.3
Manufacturer, supplierParty that manufactures or provides equipment and services for the contractor to complete the task. 3.1.4
Work area
workarea
Any area that can be entered by workers and is more than 1m away from the surface of the equipment and the place where people are exposed to noise during normal work. GH/T 20430—2006/IS0 15664:2001Note: The work area includes platforms, passages and stairs. 3.1.5
Project technical documents
projectspecification
Documents that define the project specifications.
Note: It may include process descriptions, project management, responsibilities of the parties and engineering requirements, including requirements for safety and the environment. 3.1.6
Administrative authorities National, local or other agency that sets and enforces environmental and occupational health noise standards. 3.2 Noise terminology
Noise limit noiselimit
The noise level that must not be exceeded, given in the form of sound power level, sound pressure level or exposure level. 3.2.1.1
Administrative authority noise limit
uthoritynoiselinits
Noise limits determined by the governing authority.
3.2.1.2
Contractual noise limits
Contractual noise limits
Noise limits set by the end user based on the noise limits of the regulatory agency and the company's requirements, and clearly stated in the legal contract between the user and the contractor.
3. 2. 1. 3
Equipment noise limits
Equipment noise limits
Noise limits proposed by the end user or contractor to the equipment manufacturer or supplier for a single item of equipment. 3.2.2
Tonal noise
Noise dominated by one or more clearly identifiable single-frequency sounds. Note: See ISQ49962
Impulse noise
Impaisive noise
Noise composed of one or more burst sounds with a duration of less than 1s Note: See IS1996-2 (Environmental sound recording), GB/T14366 (factory noise) and GB/T:9052 Equipment noise emission)). 3.2.4
Fluctuating noise
Noise whose sound level changes continuously and can reach a perceptible range of change within an observation period [GB/T 19052—2003, 3. 19.1
Intermittent noise
Noise whose sound level drops sharply to the background noise level several times within an observation period, [GB/T19052—2003, 3.19, 2]
Note: The sound level remains at a stable value different from the ambient noise for approximately a continuous period of time at an order of magnitude of 1 ≤ or above, 3.2.6
Noise emission
Airborne sound emitted by a certain sound source (such as machinery, equipment, part of a plant or the entire factory). Note: See CB/19052 and GB/T 17249.1. 2
Noise exposuremoiseimmisslon
The total amount of noise reaching a specified point from all sound sources. Note: See GB/T17249.1
Noise exposureaoise exposure
All noise reaching the human ear under actual circumstances within a given period of time. Note: See GB/T 17249, 1; In this standard:, this term is also used for specific locations in the environment, 4 General requirements
In view of the following reasons, it is necessary to control factory noise: - prevent hearing loss caused by noise
reduce interference with work and conversation; provide employees with a quiet living environment;
protect the environment,
- prevent interference with neighboring communities Www.bzxZ.net
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GB/T20430—2006/1SO 15664.2001 Around each of the above requirements for noise control, noise limits can be set for certain areas inside and outside the factory. In this standard, they are called "general noise limits" and are explained in detail in Chapter 5. The noise limit applicable to a piece of equipment at a specific location in the factory is determined based on the general noise limit. These are usually referred to as equipment noise limits". The process for establishing equipment noise limits is detailed in Chapter 6. Each potential noise source should meet the requirements of this standard. The management agency should exercise its functions and require that the noise level be reduced as much as reasonably practicable. The recommended noise limits can be found in national or international standards, see GB/T17249,1 (workplace), ISO9921-1 (language communication), GB/T3222.1-2006 and ISO19962 (environment).
The specified limits should be met under the design operating conditions of the factory. Unless otherwise agreed between the end user and the contractor, Other occasional operating conditions (such as starting, shutting down, restarting and maintaining equipment) should also meet the specified limits. In some emergency situations that are foreseeable and expected (such as decompression operations, that is, the situations listed above), it is only required not to exceed the absolute limits set in 5.12. The final user can set special noise limits for the construction phase of the project. These limits should meet environmental requirements. This standard mainly deals with the noise of basically fixed equipment. However, the noise radiated by mobile sources within the factory or workshop, such as transportation vehicles (trucks, trucks, rail equipment or mobile maintenance equipment, should be taken into account. If there are a considerable number of For vehicles with large quantities of transportation, the sound radiated by mobile sound sources is even more important because the noise from such sources is usually difficult to reduce. Therefore, the parties involved should investigate whether such transportation noise should be part of the noise control step. The planning and scope of the noise control project for the T plant is mainly based on the project technical requirements. All noise limits and other noise requirements proposed by the end user should be carefully and completely determined in the project technical requirements. This is often very important, especially when the project has more than one contractor or the plant (or part of the plant) is not used by the end user and the contractor. In addition to the noise limits, the project technical requirements should also include all the noise limits in the appendix. Applicable items,
This standard defines some specific tasks to be completed in a project, which are designated as implementation items (A1, A2, A3, etc.). Appendix B clarifies the responsibilities of the end user or contractor for the implementation of these implementation items, and also gives an overview of all implementation items.
5 General noise limits (exposure requirements
5.1 Factory noise
5.1.1 General
(A1 Most common users should consult the relevant management agency for relevant factory noise, hearing protection, language and work without interference and living, etc. 3
GB/T 20430—2006/1S0 15664:2001.
Noise limits are usually based on the noise exposure of workers. In this case, the working methods that cause noise exposure should be agreed upon by all parties involved. Noise limits can also be based on the maximum sound pressure level in the work area. (A2) The most stringent noise limits and other requirements should be formulated based on the requirements of the regulatory agency and the end user. The feasible noise limits should be indicated in the technical requirements of the project. When there are no noise limits from the regulatory agency, the design guidelines and other standards of GB/T17249.1L2J should be considered. 5.1.2 Absolute noise limits in the work area
Absolute limits are noise limits that cannot be exceeded anywhere in the work area and under any circumstances, including emergency situations (such as safety equipment operation).
Absolute limits are determined in implementation items (A2). 5.1.3 Work Area Noise Limits
Work Area Noise Limits are the noise levels that must not be exceeded in order to meet the limits in Implementation Item (A2) and vary from work area to work area.
5.1.4 Restricted Areas
Restricted areas are those wind zones within the plant where it is legally feasible to reduce noise to the work area noise limit requirements based on the current state of the art. However, the absolute limits are still valid in this area. If it is unavoidable to exceed the work area noise limit around some special equipment, measures should be taken to limit the scope of the area as far as economically and technically feasible, including the establishment of enclosure structures. The area enclosed by the enclosure structure around the equipment may be a restricted area.
(A3) The contractor shall identify potential restricted areas to the end user and the end user shall provide written permission to designate specific areas as restricted areas. The end user and the contractor shall jointly agree on the permissible noise level limits for restricted areas based on consideration of the requirements of the regulatory agency and reach an agreement.
（A4）Permanent warning signs for mandatory use of ear protection equipment should be set up at the boundaries of restricted areas. The signs should comply with the provisions of GB2893-2001 and GB2894-1995.
5.2 Environmental noise
Environmental noise limits are often set by management agencies and are related to existing noise levels. Regulations may include methods for measuring noise and methods for calculating environmental noise exposure based on the emission power of sound sources, as well as requirements for allowable values and environmental assessments. See GB/T17249.1 and GB/T 17249.2.
（A5）End users should investigate applicable regulations. To avoid misunderstandings, the interpretation of these regulations should be discussed with management agencies. Environmental noise limits vary for daytime, evening and night.Weekends are also different from other weekdays. All of the above should be taken into account to meet these requirements at all times.
(A6) Where there are no ambient noise limit requirements or these requirements are considered insufficient, the plant design should also consider these aspects at the technical design stage to anticipate negative reactions from residents in the future community to noise. (A?) The ambient noise limits specified by the regulatory agency are usually the sound pressure level limits in specific areas near the factory or factory boundaries under normal conditions, sometimes emergency operating conditions. These limits can be converted into contractual noise limits for various parts of the factory expressed in the form of sound power levels. In this case, the maximum sound power level limit is included in the project technical requirements. The calculation of ambient noise exposure from the sound power level of the sound source (or vice versa) should be based on recognized calculation models specified or approved by the regulatory agency and the end user. Examples of recognized calculation models (such as those in GB/T17247.2) are given in the reference: Note: There are methods that can convert household pressure level limits of plant components or large equipment into power level limits. Sound power level limits are usually expressed as octave or 1/3 signal frequency spectrum, and some include directivity restrictions. 5.3 Exceptional or emergency operation conditions
(A8) It must be ensured that the allowable occasional high noise levels (such as emergency, start-up, shutdown and maintenance operations) that are acceptable to the management agency are written into the project technical requirements.
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GB/T20430-2006/1S015664.2001 (A9) The noise limits that can be implemented during the construction phase of the plant should be separately indicated in the project technical requirements. 5.4 Additional limits for modulated noise and impulse noise If the noise contains modulated noise and impulse noise, additional limits should be made. This should be considered when specifying equipment noise limits (see 6.3.5).
6 Equipment noise limits (noise emission requirements) 6.1 General
Equipment noise limits are established based on the work area irradiation noise or exposure noise level limits (A2) and the sound power level limits obtained from (A7) or based on the noise limits specified in the project technical requirements. If the investigation results show that one or more limits are exceeded, it should be considered to replace the equipment with equipment that emits less noise. When this method is not feasible, noise control measures such as sound insulation and sound barriers should be taken. The scope of noise control measures should be determined according to the stringency of the requirements.
6.2 Equipment sound power level limits
For some factories, there are no other limits that can be adopted except the work area noise limits, and there are not many major noise sources close to each other. In this case, it is not necessary to establish equipment sound power level limits. Individual equipment sound power level limits should be established early in the project to ensure that they meet the factory noise limits. When assigning sound power level limits to individual equipment at the beginning of a project, full use can be made of data provided by the parties, noise label values (such as see CB/T14574), databases and experience, and the type, size and operating conditions of the equipment should also be taken into account. However, when the actual sound power level is known, the actual sound power level should be used. Assuming that the requirements of 6.3 are met, the equipment sound power level limit can also be calculated from the sound pressure level.
The establishment of sound power level limits for individual equipment is an iterative process. If the sound power limit (.2) is established for each area of the "entire factory or plant", it is required that the sum of the sound power level limits of each equipment does not exceed 1/the total sound power level limit. If the ambient noise limit is not given in the form of a sound power level limit, the total environmental exposure sound pressure level needs to be calculated (predicted) in the area where the ambient noise limit is applied. The noise output of a community sensitive point is the superposition of the sound pressure levels generated by each equipment at that point in the "plant". Noise propagation calculations should be calculated in accordance with the specified recognized model or calibration model agreed by the management agency and the end user (see GB/T17247.2). Then determine whether to tighten or relax the sound power level limit of the equipment to meet the sound pressure level limit of the community. A safety margin should be left between the sound pressure level calculated at the same point and the community sound pressure level limit, and the reliability of the sound power level data used and the noise margin of the equipment ignored in the calculation should also be considered. It is more economical and effective to assign higher sound power level limits to large or high-power equipment than to set the same sound power level limit for all equipment.
When the predicted community sound pressure level exceeds the sound pressure level limit, other measures should be considered in the noise control project, including redistributing equipment away from community sensitive points, using natural or artificial barriers (such as mountains and buildings), using sound barriers or noise reduction and sound insulation enclosures. In most cases, reducing noise at the source is the best method. 6.3 Equipment sound pressure level limits
6.3.1 General
When only the working area noise emission limits constrain the equipment noise emission (see 5.1.3), the emission sound pressure level limits given in 5.3.2 to 6.3.6 apply.
Where there are strict working area noise limits (such as restricted areas), the equipment noise limits given below should also be adjusted accordingly. The noise level should not exceed the equipment sound pressure level limit at 1 m2 from the equipment surface or at the operating position. Some equipment located in "generally open" factories may be placed indoors or in a shed. In this case, the sound pressure level in the room or shed should be calculated, taking into account the noise emitted by the equipment and the influence of external noise. The calculation of the noise attenuation from outdoor to indoor should be based on recognized scientific principles.
6.3.2 Equipment emitting continuous noise
The maximum value of the equipment noise limit (sound pressure level) shall meet the working area limit (see 5.1.3)5
GB/T20430—2006/ISO15664.2001If the equipment is composed of various components (such as driving and driven components), the upper limit will be applied independently. The components will not ensure that the equipment can meet the upper working area limit requirements after assembly. For such equipment, more stringent limit requirements for each independent component should be proposed, and the noise limit of a single component should be based on acoustic calculations. When multiple equipment or equipment groups are installed very close together or placed in mixed areas, the noise limit of the equipment should be further reduced. The equipment noise limit should be based on acoustic calculations (see ISO/TR11690-3, for example). 6.3.3 Equipment emitting intermittent or fluctuating noise When the overall noise limits specified in 5.1 and 5.2 are met, but the equipment radiates intermittent or fluctuating noise (such as compressors, furnace coolers, oil pumps), their predicted equivalent continuous sound level L should not exceed the equipment noise limit specified in 6.3.2. The maximum instantaneous sound pressure level can be determined by the final user or management agency (see Chapter 5) Note: When using the equivalent continuous sound pressure level, the corresponding person exposure time is reduced by half. Some regulations require a level increase of 5B instead of 3B. 6.3.4 Equipment placed outside the working area
Equipment noise limits are generally formulated at 1 meter away from the equipment. For those equipment with a minimum accessible distance greater than n, the noise limit at 1 meter of the equipment can be set slightly higher and calculated, such as exhaust chimneys and some control valves. Although the increase in the limit at 1 meter by multiplying the noise limit at the working area is allowed, it may conflict with the ambient noise limit, such as combustion noise. The most stringent requirements should be formulated based on the noise limits in the working area and the ambient noise limits. 6.3.5 Additional limits for harmonic and impulse noise When the equipment noise contains harmonic or impulse noise components and the relevant components play a major role, more restrictions should be formulated. 6.3.6 Specific equipment
Additional information on the noise of specific equipment is listed in Appendix D6.4 Equipment noise data sheet
(A10) Equipment noise data sheets should be prepared for all related equipment or equipment groups. If the equipment group is provided by the same supplier, give 6.2 and/or 6.3; if the various components of the equipment group are provided by different suppliers, a separate equipment noise data sheet should be prepared for each.
Equipment noise limits are given in decibels as A-weighted sound levels, with additional octaves from 63 Hz to 8 kHz where more precision is required.
Equipment noise data sheets (such as those given in Appendix E or similar) should be used to indicate the sound pressure level limit at a given distance (usually 1 m from the equipment surface or operating position), or the sound power level limit, or both. The equipment supplier must provide a noise guarantee for the equipment under various possible operating conditions. The equipment noise data sheet should include all the information that suppliers need to understand, meet and coordinate, as well as the noise limits for the equipment provided! It is not required that this standard and the agreement between the end user and the contractor be submitted to the equipment supplier. The equipment noise data sheet should be returned after confirmation in the standard, and the supplier should fill in the guarantee part, including the following information: a) The octave band sound power level and sound pressure level of the equipment without noise reduction, and the A-weighted sound level. b) The octave band sound power level and sound pressure level of the equipment with noise reduction and the total A-weighted sound level, and give a detailed description of all the noise reduction measures taken to achieve the noise limit. c) If the specified limits cannot be met, indicate the lowest achievable octave band sound power level and pressure level, as well as the total A-weighted level.
(l) Details of the possible levels of modulated noise, impulse noise, intermittent noise or fluctuating noise, possible activities. The following information should be attached:
e) If the bid includes noise reduction equipment, a table of data requirements for all silencers and/or soundproof enclosures should also be provided. The data obtained by measurement should be measured in accordance with recognized standards. It is recommended to use standards such as GB/T17248 series and G/T14307, GB/T6881, GB/T6882. GB/T3767, GB/T3768, GB/T16538, etc. (corresponding to ISO3740 series). All quoted guaranteed noise levels should include the upper limit of the measurement allowable error. When formulating noise limits for individual equipment, the noise control engineer should consider the error range of the test method. 6
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GB/T20430—2006/IS015664:2001 If the assurance of noise data is provided by other means, it is not necessary to specify the noise limit data/requirement form for each equipment, for example; if all pumps and motors in a project are provided by a single supplier, it is sufficient to have a single assurance list for the noise level and spectrum of each equipment.
Note: Sound power level limits and gram level limits do not need to be related or equivalent because they may be derived from different limits. That is, the sound power limit may be derived from the ambient noise limit, the sound pressure limit, the internal working area noise limit, the noise level, the noise level, the noise level of the equipment ... 6.5 Equipment selection
(A1) It must be ensured that the supplier provides all the information required by G. in the tender. If the supplier uses a different noise measurement method than that required or recommended on the data sheet, the impact of these differences should be evaluated. (A15) The cost of measures to achieve the specified noise limits should be included in the tender evaluation. In the final selection between equipment designed for low emitting noise and equipment with external noise reduction measures, the additional costs of treatment and maintenance in the sound propagation path should be taken into account. Generally, equipment designed for low emitting noise is preferred. For equipment emitting fluctuating or intermittent noise, temporary exceeding of the equipment noise limit is permitted, see 6.2 and 6.3.3. If this temporary period can be avoided by selecting a low-emission equipment and other acceptable methods, this method will usually be adopted, and if a higher reasonable additional cost is required, it will be discussed with the end user. 7 Noise reduction equipment
(A:6) Noise reduction equipment, such as silencers and acoustic enclosures, should be included in the tender as noise treatment equipment (5.4). The details of these noise reduction devices should be agreed between the selected suppliers, suppliers and contractors. Usually, the equipment supplier provides the matching noise reduction devices, so that the noise source and noise control equipment come from the same channel. However, the contractor may also choose to purchase noise reduction devices separately. The sound emitted from the noise reduction devices (such as mufflers for exhaust chimneys, duct sound insulation) is usually not the responsibility of any specific equipment supplier but the responsibility of the contractor. The integrated design of such noise reduction devices should be ensured, and the relevant data/requirements forms should be available. If necessary, the design should include the use of sound-absorbing materials or structures for potential reverberation spaces of high-noise equipment. If appropriate sound absorption is adopted, GB/T17249.1 gives recommended workshop acoustic characteristics: (A17) For some equipment, calculations or measurements may indicate that the noise level exceeds the limit, but the lower limit of its uncertainty can be reduced to below the limit (that is, it is possible to meet the limit requirements). For such equipment, the design of adequate noise control measures cannot be postponed until the noise level exceeds the limit after the equipment is in operation. If the noise control measures need to be postponed until after the equipment is put into operation, they must be approved by the end user and approved by the management agency. Electrical and other necessary requirements should be ready before operation. The consequences of adopting noise control measures later, such as changes in the type of electricity used, should be considered in the design. For large factories, the losses caused by delays in construction or reductions in production due to the installation of noise control equipment after operation often exceed the noise control equipment itself. Before the implementation of noise reduction measures, mobile or temporary protective measures can be used. For example, the silencer for noise reduction during short processes such as opening and closing should be of permanent type. The selection of silencers can be considered (GB/T30431. The design of the silencer should ensure that the detachment of its vulnerable parts will not partially block or obstruct the silencer outlet or damage downstream equipment (such as compressors). The soundproof cover can be a close-fitting type or a person-friendly type (see GB/T19886-2005). The person-friendly type soundproof cover should be designed so that the operating or maintenance personnel can carry out their work without hindrance. Some regulatory agencies require that the on-site installation of noise control facilities, such as soundproof covers, should be carried out under the supervision of a suitable and experienced noise control engineer.
8 Project Control
8.1 Noise Control Documents
(A18) Appendix F lists the documents required by the contractor's noise control engineer. These documents are provided to the final user for project 7All information required. If the supplier uses a different noise measurement method than that required or recommended on the data sheet, the impact of these differences should be evaluated. (A15) The cost of measures to achieve the specified noise limits should be included in the bid evaluation. In the final selection between equipment designed for low emitting noise and equipment with external noise reduction measures, the additional costs of treatment and maintenance in the sound propagation path should be taken into account. Generally, equipment designed for low emitting noise is preferred. For equipment emitting fluctuating or intermittent noise, temporary exceeding of the equipment noise limit is permitted, see 6.2 and 6.3.3. If this temporary period can be avoided by selecting a low emitting equipment and other acceptable means, this approach will usually be adopted, and if a higher reasonable additional cost is required, it will be discussed with the end user. 7 Noise reduction equipment
(A:6) Noise reduction equipment, such as silencers and acoustic enclosures, should be included in the bid list as noise treatment equipment (5.4). The details of these noise reduction devices should be agreed between the selected suppliers, suppliers and contractors. Usually, the equipment supplier provides the matching noise reduction devices, so that the noise source and noise control equipment come from the same channel. However, the contractor may also choose to purchase noise reduction devices separately. The sound emitted from the noise reduction devices (such as mufflers for exhaust chimneys, duct sound insulation) is usually not the responsibility of any specific equipment supplier but the responsibility of the contractor. The integrated design of such noise reduction devices should be ensured, and the relevant data/requirements forms should be available. If necessary, the design should include the use of sound-absorbing materials or structures for potential reverberation spaces of high-noise equipment. If appropriate sound absorption is adopted, GB/T17249.1 gives recommended workshop acoustic characteristics: (A17) For some equipment, calculations or measurements may indicate that the noise level exceeds the limit, but the lower limit of its uncertainty can be reduced to below the limit (that is, it is possible to meet the limit requirements). For such equipment, the design of adequate noise control measures cannot be postponed until the noise level exceeds the limit after the equipment is in operation. If the noise control measures need to be postponed until after the equipment is put into operation, they must be approved by the end user and approved by the management agency. Electrical and other necessary requirements should be ready before operation. The consequences of adopting noise control measures later, such as changes in the type of electricity used, should be considered in the design. For large factories, the losses caused by delays in construction or reductions in production due to the installation of noise control equipment after operation often exceed the noise control equipment itself. Before the implementation of noise reduction measures, mobile or temporary protective measures can be used. For example, the silencer for noise reduction during short processes such as opening and closing should be of permanent type. The selection of silencers can be considered (GB/T30431. The design of the silencer should ensure that the detachment of its vulnerable parts will not partially block or obstruct the silencer outlet or damage downstream equipment (such as compressors). The soundproof cover can be a close-fitting type or a person-friendly type (see GB/T19886-2005). The person-friendly type soundproof cover should be designed so that the operating or maintenance personnel can carry out their work without hindrance. Some regulatory agencies require that the on-site installation of noise control facilities, such as soundproof covers, should be carried out under the supervision of a suitable and experienced noise control engineer.
8 Project Control
8.1 Noise Control Documents
(A18) Appendix F lists the documents required by the contractor's noise control engineer. These documents are provided to the final user for project 7All information required. If the supplier uses a different noise measurement method than that required or recommended on the data sheet, the impact of these differences should be evaluated. (A15) The cost of measures to achieve the specified noise limits should be included in the bid evaluation. In the final selection between equipment designed for low emitting noise and equipment with external noise reduction measures, the additional costs of treatment and maintenance in the sound propagation path should be taken into account. Generally, equipment designed for low emitting noise is preferred. For equipment emitting fluctuating or intermittent noise, temporary exceeding of the equipment noise limit is permitted, see 6.2 and 6.3.3. If this temporary period can be avoided by selecting a low emitting equipment and other acceptable means, this approach will usually be adopted, and if a higher reasonable additional cost is required, it will be discussed with the end user. 7 Noise reduction equipment
(A:6) Noise reduction equipment, such as silencers and acoustic enclosures, should be included in the bid list as noise treatment equipment (5.4). The details of these noise reduction devices should be agreed between the selected suppliers, suppliers and contractors. Usually, the equipment supplier provides the matching noise reduction devices, so that the noise source and noise control equipment come from the same channel. However, the contractor may also choose to purchase noise reduction devices separately. The sound emitted from the noise reduction devices (such as mufflers for exhaust chimneys, duct sound insulation) is usually not the responsibility of any specific equipment supplier but the responsibility of the contractor. The integrated design of such noise reduction devices should be ensured, and the relevant data/requirements forms should be available. If necessary, the design should include the use of sound-absorbing materials or structures for potential reverberation spaces of high-noise equipment. If appropriate sound absorption is adopted, GB/T17249.1 gives recommended workshop acoustic characteristics: (A17) For some equipment, calculations or measurements may indicate that the noise level exceeds the limit, but the lower limit of its uncertainty can be reduced to below the limit (that is, it is possible to meet the limit requirements). For such equipment, the design of adequate noise control measures cannot be postponed until the noise level exceeds the limit after the equipment is in operation. If the noise control measures need to be postponed until after the equipment is put into operation, they must be approved by the end user and approved by the management agency. Electrical and other necessary requirements should be ready before operation. The consequences of adopting noise control measures later, such as changes in the type of electricity used, should be considered in the design. For large factories, the losses caused by delays in construction or reductions in production due to the installation of noise control equipment after operation often exceed the noise control equipment itself. Before the implementation of noise reduction measures, mobile or temporary protective measures can be used. For example, the silencer for noise reduction during short processes such as opening and closing should be of permanent type. The selection of silencers can be considered (GB/T30431. The design of the silencer should ensure that the detachment of its vulnerable parts will not partially block or obstruct the silencer outlet or damage downstream equipment (such as compressors). The soundproof cover can be a close-fitting type or a person-friendly type (see GB/T19886-2005). The person-friendly type soundproof cover should be designed so that the operating or maintenance personnel can carry out their work without hindrance. Some regulatory agencies require that the on-site installation of noise control facilities, such as soundproof covers, should be carried out under the supervision of a suitable and experienced noise control engineer.
8 Project Control
8.1 Noise Control Documents
(A18) Appendix F lists the documents required by the contractor's noise control engineer. These documents are provided to the final user for project 7
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