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GB/T 39986-2021 English PDF

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GB/T 39986-2021: Pumps - Testing - Submersible mixers for wastewater and similar applications
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GB/T 39986-2021English374 Add to Cart 4 days [Need to translate] Pumps - Testing - Submersible mixers for wastewater and similar applications Valid GB/T 39986-2021

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Basic data

Standard ID GB/T 39986-2021 (GB/T39986-2021)
Description (Translated English) Pumps - Testing - Submersible mixers for wastewater and similar applications
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J71
Word Count Estimation 20,231
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 39986-2021: Pumps - Testing - Submersible mixers for wastewater and similar applications

---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.
Pumps-Testing-Submersible mixers for wastewater and similar applications ICS 23.080 J71 National Standards of People's Republic of China Pump test sewage and submersible mixers for similar applications (ISO 21630.2007, IDT) Released on 2021-04-30 2021-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ 1 Scope 1 2 Terms and definitions 1 3 Symbols and abbreviations 2 4 Guarantee 3 4.1 Guaranteed objects 3 4.2 Guarantee conditions 4 5 Implementation of the test 4 5.1 Test object 4 5.2 Test organization 4 5.3 Test device 6 5.4 Test conditions 6 6 Analysis of test results 9 6.1 Conversion of test results to guaranteed conditions 9 6.2 Measurement uncertainty 9 6.3 Tolerance factor value 10 6.4 Verification of guarantee 11 7 Measurement of thrust 12 7.1 Flow conditions for agitator thrust measurement 12 7.2 Measuring method of agitator thrust 14 7.3 Uncertainty of measurement 15 8 Measurement of the input power of the agitator 15 Appendix A (informative appendix) Checklist 16 Reference 17

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. The translation method used in this standard is equivalent to ISO 21630.2007 "Pump Test Sewage and Submersible Mixers for Similar Applications". For ease of use, this standard has made the following editorial changes. --- Include the definitions of "submersible agitator" and "liquid" in the scope of international standards in terms and definitions (see 2.4, 2.5). This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Pump Standardization Technical Committee (SAC/TC211). Drafting organizations of this standard. Jiangsu Pump and Valve Product Quality Supervision and Inspection Center, Shanghai Kaiquan Pump Industry (Group) Co., Ltd., Hefei Hongrunhuan Technology Co., Ltd., Shanghai KSB Pump Co., Ltd., Zhenjiang Liquid Engineering Equipment Technology Research Institute of Jiangsu University, Lanshen Group Co., Ltd. Company, New Territories Pump Industry Group Co., Ltd., Jiangsu Taifeng Pump Industry Co., Ltd., Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Guangzhou Xin Heng Pump Manufacturing Co., Ltd., Xiamen Keli Electronics Co., Ltd., Guangdong Baijin New Energy Co., Ltd., Xiamen Kexin Electronics Co., Ltd., Xiamen Mensanxing Electronics Co., Ltd., Xiamen Wanming Electronics Co., Ltd., CSSC Chongqing Intelligent Equipment Engineering Design Co., Ltd., Shenyang Pump Research Institute Research institute. The main drafters of this standard. Lu Binbin, Wang Yanhe, Li Wenbing, Pan Zaibing, Sun Bing, Chen Bin, Ling Guirong, Mao Ji, Li Hao, Wang Jing, Yi Zhonghui, Pi Kunlin, Li Junxu, Long Xinhua, Huang Jingming, Liu Haichuan, Kang Na. Pump test sewage and submersible mixers for similar applications

1 Scope

This standard specifies the acceptance test method for submersible agitators (hereinafter referred to as "agitators"). This standard applies to agitators in which at least one of the system media is liquid in the transportation of sewage and other applications.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Thrust-to-power ratio The ratio of the thrust of the stirrer to the power of the stirrer. RFP =F/P1 Note 1.The ratio of the minimum necessary mixing system power dissipation to the agitator power consumption refers to the (end-user-oriented) system efficiency. In order to understand the weight of the thrust-to-power ratio It is important to consider the situation where the agitator produces a longitudinal flow velocity u in the recirculation channel such as the sewage oxidation ditch. This is actually a common application of agitator Use, and the following argument may be extended to other applications in principle. The flow momentum loss in a cycle is equal to the momentum rate provided by the agitator in a quasi-steady state. This is given by the agitator thrust F. Momentum loss caused The power consumption P=Fu, which is the minimum stirring system power necessary to maintain the speed u. Therefore, the system efficiency P/P1=Fu/P1. In this expression, the characteristics of the agitator can be separated from the system requirements, and it can be concluded that the thrust power ratio RFP is an important parameter related to the efficiency of the agitator. It should be noted The point is that it depends on the diameter and speed of the impeller, not just the geometry of the impeller. In addition to considering the generation of vertical flow energy efficiency, it is also necessary to consider the actual Various factors such as the diameter and speed of the impeller available in the application. Note 2.The efficiency of the impeller can be defined as the ratio of the power produced by the axial movement of the impeller flow to the electric power absorbed by the agitator. In this definition, it is assumed that the approach speed u is sufficient It is small enough and has negligible influence on the characteristics of the agitator impeller. The relationship between hydraulic discharge power Ph=pQ and thrust is. p=F/A and F =2ρQ2/A It can be applied to the agitator test specified in this standard. Because the exit section best meets the requirements of the plane velocity distribution, A/2 is usually used. by A=πD2/4, we get. Ph = F/AAF/2ρ 1 /2 =F3/2/D πρ/2 1 /2 Therefore, the impeller efficiency can be obtained. η=F3 /2/πρ/2 1 /2D P1 It is worth noting that usually the correction is in the range of 1%, and the efficiency is usually given as (assuming SI unit [F]. Newton, [P1]. Watt, [D]. meter, and such as Clean cold water as defined in 5.4.5.2). η=F3 /2/40DP1 Although the derivation given here is not based on completely correct assumptions, more rigorous methods can be used to derive approximate expressions of efficiency. Since the efficiency of the stirring system is determined according to the diameter and speed of the impeller, the efficiency of the impeller itself is not important. 2.2 Advance ratio The ratio of the speed of the propeller or the average environmental speed of the liquid to the (essential) blade tip speed. J=u/nD 2.3 Impeler Reynoldsnumber impelerReynoldsnumber The ratio of the inertial force and the viscous force at the impeller.

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