GB/T 25753.1-2010 English PDFUS$189.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25753.1-2010: Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 1: Measurement of maximum tolerable differential pressure Status: Valid
Basic dataStandard ID: GB/T 25753.1-2010 (GB/T25753.1-2010)Description (Translated English): Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 1: Measurement of maximum tolerable differential pressure Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J78 Classification of International Standard: 23.160 Word Count Estimation: 8,853 Date of Issue: 2010-12-23 Date of Implementation: 2011-10-01 Regulation (derived from): National Standard Approval Announcement 2010 No.10 (Total No.165) Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the maximum allowable pressure Roots vacuum measurement speed. This section applies to pumping speed of 30 L/s-20 000 L/s Roots vacuum pump (hereinafter referred to as the pump). GB/T 25753.1-2010: Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 1: Measurement of maximum tolerable differential pressure---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. .. Vacuum technology Roots vacuum pump Measurement of performance characteristics Part 1. Measurement of maximum tolerable differential pressure ICS 23.160 J78 National Standards of People's Republic of China Roots vacuum pumps - Measurement of performance art Part 1. The maximum allowable differential pressure measurement characteristics-Part 1. Measurementofmaximumtolerabledifferentialpressure Issued on. 2010-12-23 2011-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordGB/T 25753 "Roots vacuum pumps - Measurement of performance art" is divided into three parts. --- Part 1 maximum allowable differential pressure measurement; --- Part 2 compression ratio of zero flow measurement; --- PART 3 relief valve differential pressure measurement. This is Part 1 GB/T 25753 of. This part is proposed by China Machinery Industry Federation. This part of the National Vacuum Technology Standardization Technical Committee. This section is responsible for drafting. Zhejiang Vacuum Equipment Group Co., Ltd. Participated in the drafting of this section. Chengdu South-ray machines Limited, Shenyang Institute of Scientific Instrument Development Center, Shandong Zibo Vacuum Equipment Co., Ltd., Anhui Hefei Science and Technology Co., Ltd., Shenyang Institute of Vacuum Technology. The main drafters of this section. Wang Xiaohu, Wang Xi, Fanlin Dong, Wang Guangyu, Xu Jian law, Ms. Huang, Wang Lingling, ROCKETS.IntroductionWith the development of basic industries and design innovation, design and performance Roots pump structure have made considerable Progress early Roots vacuum pumps must rely on pre-pump operation, and now the development of a direct atmospheric discharge run-cooled Roots Roots vacuum pumps and wet, the other a single series Roots vacuum pump has become the single-stage single-stage, two-stage, multi-stage, rotor profile also Futaba become the double leaf, clover, leafy. Existing Roots vacuum pump performance measure encompasses only a single-stage double-lobe Roots pump, other types of basic not involved, and Not made on how to measure the differential pressure relief valve specifications, to effectively improve the Roots vacuum pump performance measurement standards compatibility and suitability for the practical Test measurements provide the necessary operating instructions, drawing in a wide range of domestic and foreign-related indicators, benchmarks, based on the actual situation, the development of the "vacuum Roots vacuum pump performance measurement technology "standards, and is divided into three parts. Extreme pressure and pumping rate of the Roots vacuum pump unit Energy measurements, not according to the standard content. In the future will make the necessary modifications and expansion basis of technological development. Roots vacuum pumps - Measurement of performance art Part 1. The maximum allowable differential pressure measurement1 ScopeGB/T 25753 provisions of this part of the Roots vacuum pump the maximum allowable differential pressure measurement method. This section applies to a pumping speed 30L/s ~ 20000L/s Roots vacuum pump (hereinafter referred to as the pump).2 Terms and definitionsThe following terms and definitions apply GB/T 25753 in this section. 2.1 The maximum allowable pressure maximumtolerabledifferentialpressure The maximum allowable pressure refers to the continuous operation of the pump 1h, the maximum allowed by abnormal outlet pressure and the inlet pressure difference does not occur. for Roots vacuum pump inlet pressure measurement should be equal to or slightly less than 1 × 103Pa. Note. For other types of Roots vacuum pumps without inlet pressure value requirements, but should be appropriate for the structure of the pump, or follow the manufacturer's recommendations. 2.2 Test cover testdome Special vacuum vessel having a predetermined precise shape and dimensions, through which the gas to be measured into the pump, on which pressure measurement Means.3 devices3.1 Test cap As shown in Figure 1, the shape of a cylinder. The axial dimension of the cover is 1.5D, D is the inner diameter of the housing. Test gas inlet is located in the axis of the cover On the connection flange and the distance is D, arranged in the intake port should be such that the gas from the direction away from the pump into the test port cover. Measuring the inlet pressure Gauge distance 0.5D connecting flange at its axis is perpendicular to the axis of the cover. Testing should cover the axis perpendicular to the pump inlet flange plane. In addition to the intake line, the connecting line between the flange and the test covers the inner wall of the test should not wear a cap. VD test cover volume should be at least one compression cycle pump swept five times the volume of the VP. In the pump inlet should be connected to a reducer fittings, Its length should not exceed 0.5D (see Figure 1). Different specifications of the pump for test cover given in Table 1. Table 1 Test parameters cover VP/L VD/LD/mm 0 0.26 1.3 100 0.26 1.0 5.4 160 1.1 ~ 4.2 21250 4.2 ~ 1784400 17 to 65 325 630 65 - 26013001000 260 to 106,053,001,600 1060 - 4060203002500 ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25753.1-2010_English be delivered?Answer: Upon your order, we will start to translate GB/T 25753.1-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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