GBZ33902-2017 English PDF

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GBZ33902-2017: Measurement of fluid flow by means of pressure differential devices -- Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/Z 33902-2017	719	Add to Cart	6 days	Measurement of fluid flow by means of pressure differential devices -- Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods	Valid

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Basic data

Standard ID: GB/Z 33902-2017 (GB/Z33902-2017)
Description (Translated English): Measurement of fluid flow by means of pressure differential devices -- Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods
Sector / Industry: National Standard
Classification of Chinese Standard: N12
Classification of International Standard: 17.120.10
Word Count Estimation: 36,356
Date of Issue: 2017-07-12
Date of Implementation: 2018-02-01
Quoted Standard: GB/T 2624.1-2006; GB/T 2624.2-2006; GB/T 2624.3-2006; GB/T 2624.4-2006
Adopted Standard: ISO/TR 12767-2007, IDT
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 guidelines for measuring flow rates using differential pressure devices with structural and operating conditions beyond GB / T 2624. Additional tolerances or corrections may not be able to compensate for the effects of deviations from the provisions of GB / T 2624 (all parts). The information given in this standard first describes the impact that will not be met in order to clarify the degree of concern that must be given in the manufacture, installation and maintenance of the differential pressure device; secondly, the user who can not fully meet the requirements can The resulting size and range of flow errors. Each of the changes described in this standard is considered to be the only change. If there are several changes that are known, there may be unpredictable interactions, so special attention should be paid to the combination of these errors. in case

GBZ33902-2017: Measurement of fluid flow by means of pressure differential devices -- Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods

---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 of fluid flow by means of pressure differential devices. Guidelines on the effect of departure from the specifications and operating conditions given in GB/T 2624 and the correction methods ICS 17.120.10 N12 People's Republic of China national standardization of technical guidance documents Use differential pressure to measure fluid flow Deviate from the requirements given in GB/T 2624 and Influence of Working Conditions and Correction Methods specificationsandoperatingconditionsgiveninGB/T 2624 and thecorrectionmethods (ISO /T R12767.2007, Measurementoffluidflowbymeansofpressure specificationsandoperatingconditionsgiveninISO 5167, IDT) 2017-07-12 Posted on.2018-02-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 symbols and abbreviations 2 5 error on the flow calculation 3 5.1 General 3 5.2 quantifiable impact 3 6 Structural deviation effects 3 6.1 plate edge sharpness 3 6.2 orifice edge thickness 4 6.3 orifice plate, the downstream end conditions 5 6.4 orifice pressure port position 6 6.5 pressure port conditions 6 7 near the pipeline device 7 7.1 diameter 7 7.2 diameter steps and tapered pipe 7 7.3 Clamping ring diameter 8 7.4 Seal ring size is too small 10 7.5 weld protruding 10 7.6 eccentric 10 8 pipeline layout impact 12 8.1 General 12 8.2 Outflow coefficient compensation 12 8.3 Pressure port 13 8.4 to improve the flow conditions of the device 13 9 operating deviation 15 9.1 General 15 9.2 orifice deformation 15 9.3 Orifice upstream sediment 17 9.4 Measuring tube sediment 20 9.5 orifice edge sharpness 21 9.6 Venturi tube sediments and surface roughness increased 22 Pipe roughness of 23 10.1 General 23 10.2 Upstream Pipeline 24 Downstream piping 27 10.4 Reduce the effect of roughness 27 10.5 Maintenance 27 References 28

Foreword

This instructional document has been drafted in accordance with the rules given in GB/T 1.1-2009. This Guidance Document is equivalent to translation method ISO /T R12767.2007 "Measurement of Fluid Flow Deviation Using Differential Pressure Devices ISO 5167 given the requirements and working conditions impact guide. " The following editorial changes have been made to this technical document. --- Change the name of the document to "Use differential pressure devices to measure fluid flow deviations from the requirements and working conditions given in GB/T 2624 Ring and its correction method. " This guidance document corrects editorial errors in ISO /T R12767-2007. --- Figure 2 is not drawn in the curve, the document to draw a curve; --- 6.4.4 Last line, add "%" after 0.5 and 0.078; --- formula (4) δqm and δD to Δqm, ΔD; --- Figure 7 of β to δ. This guidance document is proposed by China Machinery Industry Federation. This Guidance Document is governed by the National Technical Committee for Measurement, Control and Automation of Industrial Processes (SAC/TC124). The guiding technical document is drafted by Shanghai Institute of Industrial Automation Instrumentation. The guidance of technical documents to participate in the drafting unit. Beijing Ruipu ternary Instrument Co., Ltd., Fujian Run Precision Instrument Co., Ltd., Jiangsu Provincial Quality and Technical Supervision gas flow measurement and testing center, Jiangyin throttling Plant Co., Ltd., Shanghai Weier Tai Industrial Automation Co., Ltd. Division, Shenyang North Star Instrument Manufacturing Co., Ltd., Tianxin Instrument Group Co., Ltd., Tianjin Xinke Complete Instrument Co., Ltd. Zhejiang Cangnan instrument set Group Co., Ltd. The main drafters of this technical guidance document Xiao Hong Lian, Li Minghua, Li Zhenzhong, Ge Jian, Shi Jianrong, Yan Yongfeng, Xu Zhen, Chen Ping, Tao Zhaojian, Xing Ligang, Zhang Sheng Italy.

Introduction

GB/T 2624 (all parts) provides for the use of differential pressure device to measure the flow method. Observe the provisions of GB/T 2624 (all parts) The uncertainty of the flow measurement can be within a limited range. However, if the flow measurement device, for whatever reason, deviates GB/T 2624 (all parts) under the conditions specified may not be able to achieve the required uncertainty. Many measuring devices are not present or not Law consistent with these conditions. In such cases, it is often not possible to accurately assess the effects of deviations. However, there is a lot of data available To illustrate the impact does not meet GB/T 2624 (all parts), the contents of this document as a guide to the flow measurement device user. Use differential pressure to measure fluid flow Deviate from the requirements given in GB/T 2624 and Influence of Working Conditions and Correction Methods

1 Scope

This guidance is given in the guidance of technical documents using the structure and working conditions beyond the scope of GB/T 2624 differential pressure device to measure flow guide. Additional tolerances or amendments do not necessarily compensate deviations from the provisions of GB/T 2624 (all parts) of the impact. This guideline technique The information given in the document first describes the effects that will be caused by the non-conformity of the requirements to specify the necessary requirements for the manufacture, installation and maintenance of DP devices The second is to enable users who can not fully meet the requirements to generally estimate the size and scope of the resulting traffic error. Each of the changes described in this guidance document is considered the only change that has occurred. If it is known that there are multiple changes, it may be saved In unpredictable interactions, special attention needs to be paid when evaluating these errors in combination. If there is a considerable amount of error, it must be Consider ways to eliminate some of these errors. The changes included in this guidance document are not exhaustive and relate mainly to the fact that the orifice example. An example of a venturi is given at the end of the chapter. There is no doubt that the device does not meet GB/T 2624 (all parts) There are many similar examples, no disclosure of any comparable data. Such additional letters are obtained from users, manufacturers or other sources Interest rates may be considered in the next version of this guidance document.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 2624.1-2006 Measurement of full pipe fluid flow using differential pressure devices installed in circular sectioned pipes - Part 1. General Principles and requirements (ISO 5167-1.2003, IDT) GB/T 2624.2-2006 Measurement of full pipe fluid flow using a differential pressure device installed in a circular sectioned pipe - Part 2 - Orifice (ISO 5167-2.2003, IDT) GB/T 2624.3-2006 Manifold fluid flow measurement using a differential pressure device mounted in a circular sectioned pipe - Part 3. Nozzle And Venturi nozzle (ISO 5167-3.2003, IDT) GB/T 2624.4-2006 Manifold fluid flow measurement using differential pressure devices installed in circular sectioned pipes - Part 4 Ventura In tube (ISO 5167-4.2003, IDT)

3 Terms and definitions

GB/T 2624.1-2006 defined and the following terms and definitions apply to this document. 3.1 Square edge The angular relationship between the orifice of the flow measurement device and the upstream end face is 90 ° ± 0.3 °. 3.2 Sharpness sharpness The radius of the edge between the orifice of the flow measurement device and the upstream face. Note. When the edge radius is not more than 0.0004d, the upstream edge of the orifice can be considered as a sharp edge, and d means the orifice diameter. ......

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