GB/T 4980-2025 English PDFUS$619.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 4980-2025: Determination of sound level for noise emitted by displacement compressors Status: Valid GB/T 4980: Historical versions
Basic dataStandard ID: GB/T 4980-2025 (GB/T4980-2025)Description (Translated English): Determination of sound level for noise emitted by displacement compressors Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J72 Classification of International Standard: 23.140 Word Count Estimation: 30,310 Date of Issue: 2025-05-30 Date of Implementation: 2025-12-01 Older Standard (superseded by this standard): GB/T 4980-2003 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 4980-2025: Determination of sound level for noise emitted by displacement compressors---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.ICS 23.140 CCSJ72 National Standard of the People's Republic of China Replace GB/T 4980-2003 Determination of Noise of Positive Displacement Compressors compressors Released on 2025-05-30 2025-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of contentsPreface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test Environment 3 5 Measuring instruments 3 6 Installation and operation of the compressor 4 7 Reference body and measuring surface 5 8 Determination of sound power level 6 9 Determination of emission sound pressure level at working position 8 10 Measurement uncertainty 8 11 Record content 9 12 Measurement Report 10 Appendix A (Normative) Acoustic Environment Identification Method 11 Appendix B (Normative) Simple method for measuring the sound power level of compressor noise 13 Appendix C (Informative) Illustration of a typical compressor unit reference body 15 Appendix D (Informative) Measurement methods for compressors with main dimensions greater than 7m 20 Appendix E (Informative) Record form and measurement report format 21 Reference 24 Figure 1 Example of reference body, measuring surface and measuring point position 6 Figure C.1 Reference body of Z-type compressor unit 15 Figure C.2 Reference body of L-type compressor unit 15 Figure C.3 Reference body of V-type compressor unit 16 Figure C.4 Reference body of screw compressor unit 16 Figure C.5 Reference body of micro compressor unit 17 Figure C.6 Reference body of mobile compressor unit 17 Figure C.7 Reference body of a compressor unit driven by an internal combustion engine 18 Figure C.8 Reference body of D-type compressor unit 18 Figure C.9 Reference body of H-type compressor unit 19 Figure C.10 Reference body of M type compressor unit 19 Table 1 Typical upper limits of the standard deviation of the repeatability of the sound power level measurement method determined in this document 9 Table A.1 Approximate values of average sound absorption coefficient α12 Table E.1 Noise measurement record form 21 Table E.2 Compressor noise measurement report 23ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 4980-2003 "Determination of noise level of positive displacement compressors". In addition to the integration and editorial changes, the main technical changes are as follows. --- Changed the scope (see Chapter 1, Chapter 1 of the.2003 edition); --- Added all terms and definitions (see Chapter 3); --- Changed the requirements for measuring instruments (see Chapter 5, 4.1 of the.2003 edition); --- Changed the installation and operation of the compressor (see Chapter 6, 4.3 of the.2003 edition); --- Changed the measuring point position (see 7.3.2, 5.1.3.2 of the.2003 edition); --- The measurement method has been changed (see 8.1.2, 5.1.4 of the.2003 edition); --- Changed the background noise correction method (see 8.3, 5.1.1 of the.2003 edition); --- Added the noise measurement method for compressors with main dimensions greater than 7m (see 9.1, Appendix D); --- Changed the uncertainty (see Chapter 10, 4.2.3 of the.2003 edition); --- The acoustic environment identification method has been changed (see Appendix A, 5.3 of the.2003 edition, Appendix E). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Compressor Standardization (SAC/TC145). This document was drafted by. Hefei General Machinery Research Institute Co., Ltd., Hefei General Mechanical and Electrical Products Testing Institute Co., Ltd., Guangdong Ai Gao Equipment Technology Co., Ltd., the 711th Research Institute of China State Shipbuilding Corporation, Xiamen East Asia Machinery Industry Co., Ltd., Shanghai Younai Atlas Copco (Wuxi) Compressor Co., Ltd., Hitachi Compressor (Suzhou) Co., Ltd., Shanghai Keluo Compressor Co., Ltd., Sazhen Compressor (Shanghai) Co., Ltd., Xinlei Compressor Co., Ltd., Pan Asia Gas Technology (Wuxi) Co., Ltd. Co., Ltd., Guangdong Baode Technology Co., Ltd. The main drafters of this document are. Geng Maofei, Li Jinrong, Bao Yangyang, Nie Changjun, Diao Anna, Han Wenhao, Lü Zhaoling, Ni Jie, Liu Xiaoyu, Gao Baohua, Cheng Hongxing, Yuan Jun, Zhu Yunyu, Ye Cailiang, Li Xiaosa, Han Hongdong, Wang Yuli, Lin Siqiao, Chen Yuguo, Li Zhongquan. This document was first issued in 1985, revised for the first time in.2003, and this is the second revision. Determination of Noise of Positive Displacement Compressors1 ScopeThis document describes the method for determining the noise emitted by positive displacement compressors (including the method for determining the sound power level of positive displacement compressors and the method for determining the noise emitted by positive displacement compressors in the workplace). The standard specifies the method for determining the emission sound pressure level at the working position and specifies the installation, operation and working requirements of positive displacement compressors during the determination. This document applies to positive displacement compressors including the driver.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3102.7 Acoustic quantities and units GB/T 3241-2010 Electroacoustic octave and fractional octave filters GB/T 3785.1-2023 Electroacoustic sound level meter Part 1.Specification GB/T 3947 Acoustic Terminology GB/T 15173-2010 Electroacoustic sound calibrator3 Terms and definitionsThe terms and definitions defined in GB/T 3102.7 and GB/T 3947 and the following apply to this document. 3.1 A machine that increases static pressure by sequentially sucking a certain volume of gas into and out of a closed space through the displacement of moving parts. 3.2 emission The airborne sound radiated by a specific noise source (such as the machine under test) under specific operating and installation conditions. Note. The basic noise emission is the sound power level of the sound source itself and the emission sound pressure level in the workplace and other specified locations near the sound source. 3.3 The sound pressure at a specified position on a reflecting plane near a sound source working under specified installation and operating conditions. Note 1.The emitted sound pressure does not include the background noise and the reflected sound outside the test target’s allowed one or more reflecting surfaces. Note 2.The unit of emitted sound pressure is Pascal (Pa). 3.4 Lp The ratio of the square of the emitted sound pressure p to the square of the reference sound pressure p0 is 10 times the logarithm with base 10. Lp=10lg p2 p20 ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 4980-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 4980-2025_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 4980-2025?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4980-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
