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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7777-2021: Measurement and evaluation of mechanical vibration of displacement compressors Status: Valid GB/T 7777: Historical versions
Basic dataStandard ID: GB/T 7777-2021 (GB/T7777-2021)Description (Translated English): Measurement and evaluation of mechanical vibration of displacement compressors Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J72 Word Count Estimation: 9,989 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 7777-2021: Measurement and evaluation of mechanical vibration of 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.Measurement and evaluation of mechanical vibration of displacement compressors ICS 23:140 CCSJ72 National Standards of People's Republic of China Replacing GB/T 7777-2003 Mechanical Vibration Measurement and Evaluation of Positive Displacement Compressors Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Measurement 1 5 reviews 3 6 Measurement record content 4 Appendix A (Informative) Compressor Vibration Severity Level 6 forewordThis document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document replaces GB/T 7777-2003 "Mechanical Vibration Measurement and Evaluation of Positive Displacement Compressors": Compared with GB/T 7777-2003, In addition to structural adjustments and editorial changes, the main technical changes are as follows: --- Revised the description of the scope and expanded the scope of application (see Chapter 1, Chapter 1 of the:2003 edition); --- Added the terms defined in GB/T 2298, GB/T 4975 and JB/T 9107 applicable to this document (see Chapter 3); --- Delete some terms and definitions (see 2:1, 2:2, 2:3 of the:2003 edition); --- Modified the definition of vibration intensity (see 3:1, 2:4 of the:2003 edition); --- Adjusted the requirements for measuring instruments (see Chapter 3 of 4:1,:2003 edition); --- Adjusted the measured point parameters (see 4:2, 6:1 of the:2003 edition); --- Adjusted the operating environment requirements (see 4:4, 4:2 of the:2003 edition); --- Deleted the vibration measurement method for compressors driven by internal combustion engines (see 4:3 of the:2003 edition); --- Supplement the specific requirements of operating conditions (see 4:5, 4:4 of the:2003 edition); --- Added processing requirements for other effects (see 4:6); --- Supplement some structural types and adjust the vibration intensity evaluation index (see Table 1, Table 2, Table 2 and Table 3 of the:2003 edition); --- Adjusted the chapter on vibration intensity level (see Appendix A, 6:2 of the:2003 edition): Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by China Machinery Industry Federation: This document is under the jurisdiction of the National Compressor Standardization Technical Committee (SAC/TC145): This document is drafted by: Hefei General Machinery Research Institute Co:, Ltd:, Hefei General Mechanical and Electrical Products Testing Institute Co:, Ltd:, Chongqing Kaishanliu Body Machinery Co:, Ltd:, Xinlei Compressor Co:, Ltd: The main drafters of this document: Bao Yangyang, Li Jinrong, Liu Yuyong, Ye Peng, Xing Zhisheng, Wang Lixin, Yuan Jun, Xiao Xiaowan, Wang Chenxi, Cui Dong: The previous versions of this document and its superseded documents are as follows: --- First published in 1987 as GB/T 7777-1987, first revised in:2003; ---This is the second revision: Mechanical Vibration Measurement and Evaluation of Positive Displacement Compressors1 ScopeThis document specifies the measurement, evaluation and measurement record content of mechanical vibration of positive displacement compressors (hereinafter referred to as compressors): This document applies to electric motor-driven compressors: The measurement and evaluation of mechanical vibration of compressors driven by other methods can be used for reference:2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 2298 Mechanical Vibration, Shock and Condition Monitoring Vocabulary GB/T 4975 General rules of terminology for positive displacement compressors GB/T 13824 Requirements for Vibration Intensity Measuring Instruments for Mechanical Vibration of Rotating and Reciprocating Machines JB/T 9107 Terms of Reciprocating Compressor3 Terms and DefinitionsThe terms and definitions defined in GB/T 2298, GB/T 4975 and JB/T 9107 and the following terms and definitions apply to this document: 3:1 vibration intensity Under the specified compressor support and operating conditions, the maximum value of the root mean square value of the vibration velocity measured at multiple different points of the compressor:4 Measurement4:1 Measuring instruments The measuring instrument shall comply with the provisions of GB/T 13824: The measuring instrument should be able to measure and directly display the root mean square value of vibration velocity in the frequency range of at least 10Hz~1000Hz: but for For compressors whose operating speed is lower than 600r/min, the lower limit frequency of the measuring instrument should reach 2Hz: When a high-speed rotary compressor needs to be measured with an instrument with a wider frequency range, the upper frequency limit of the measuring instrument is usually higher than 2:5 times the scavenging frequency of the compressor's compression element: 4:2 Measurement parameters The measurement parameter should be the root mean square value of the vibration velocity measured at the specified measurement point and measurement direction: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7777-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 7777-2021_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 7777-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 7777-2021 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. |
