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GB/T 35138-2017Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid (English PDF)

封闭管道中流体流量的测量渡越时间法液体超声流量计

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Level / Type

National · Recommended

Issue date

December 29, 2017

Implementation date

July 1, 2018

Scope

GB/T 35138-2017 is the English-translated version of 封闭管道中流体流量的测量渡越时间法液体超声流量计.

GB/T 35138-2017 — This standard specifies the use of ultrasonic signal transit time to measure liquid ultrasonic flowmeters in one-way homogeneous liquid flow in closed pipes.

(Hereinafter referred to as. flow meter) Terms, symbols and abbreviations, measurement principles, performance, calibration, output characteristics, and installation conditions.

This standard has no restrictions on the maximum or minimum size of the flowmeter.

This standard applies to the presence or absence of a dedicated verification (calibration) system, the use of plug-in and clip-on transducers (for beam refraction and beam Refraction of two configurations of flowmeters, including metered flowmeters and flowmeters with field mounted transducers.

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Document preview — GB/T 35138-2017

National Standard of the People's Republic of China

ICS: 17.120.10
Classification: N 12

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Preface
1 Scope
2 Normative references
3 Terms, definitions, symbols, and abbreviations
3.1 Quantity
3.2 Flowmeter Structure
3.3 Thermal Conditions
3.4 Statistics
3.5 Calibration
3.6 Symbols and Subscripts
3.7 Abbreviations
4 Measurement principle
4.1 Overview
4.2 Volume flow
4.3 Basic Type Description
4.4 Time Delay
4.5 Refraction
4.6 Reynolds Number
4.7 Temperature and Pressure Corrections
5 Performance Requirements
6 Measurement uncertainty
6.1 General
6.2 Uncertainty component assessment
7 Installation
7.1 General
7.2 Use of standard equipment
7.3 Laboratory Calibration or Theoretical Prediction
7.4 Other Installation Impacts
8 Test and Calibration
8.1 General
8.2 Single Test - Using Theoretical Prediction
8.3 Single Test - Flow Calibration in Flow Conditions
9 Performance Test
9.1 General
9.2 Repeatability and Reproducibility
9.3 Additional Tests for Transducers Installed on External Flowmeters
9.4 Uncertainty assessment of flowmeters for predicting performance using theoretical prediction
9.5 Liquid-mechanical conditions
9.6 Analog Channel Failure and Replacement Components
10 Characteristics of Flowmeters
10.1 Body, Material and Structure
10.2 Transducer
10.3 Electronic Components
10.4 Software
10.5 Replacement Parts
10.6 Determining Density and Temperature
11 Actual operation
11.1 General
11.2 Verification Process
11.3 Running Diagnostics
11.4 Verification tracking, mutual comparison and inspection during operation
11.5 Recalibration
Appendix A (Normative) Temperature and Pressure Correction
Appendix B (Informative) Impact of Roughness Changes
Appendix C (Informative) Uncertainty Calculation Example
Appendix D (Informative) Documentation
Reference

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the translation method equivalent to the use of ISO 12242:2012 "Measurement of fluid flow in closed pipes. Transit time method Liquid ultrasound Flowmeter.

The Chinese documents that are consistent with the international documents that are normatively referenced in this standard are as follows.

--- GB/T 17611-1998 Terms and symbols for measurement of fluid flow in closed pipes (idt ISO 4006:1991) this standard is proposed by China Machinery Industry Federation.

This standard is under the jurisdiction of the National Industrial Process Measurement, Control, and Automation Standardization Technical Committee (SAC/TC124).

1 Scope

This standard specifies the use of ultrasonic signal transit time to measure liquid ultrasonic flowmeters in one-way homogeneous liquid flow in closed pipes.

(Hereinafter referred to as. flow meter) Terms, symbols and abbreviations, measurement principles, performance, calibration, output characteristics, and installation conditions.

This standard has no restrictions on the maximum or minimum size of the flowmeter.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

ISO 4006 Measurement terms and symbols for fluid flow in closed pipes (Measurementoffluidflowinclosedcon-duits-Vocabularyandsymbols)

3 Terms, definitions, symbols and abbreviations

The terms and definitions defined by ISO 4006 and the following apply to this document.

3.1 Quantity

3.1.1

Volume flowrate

In the formula.

V --- volume;

t --- time.

Note. Rewrite ISO 80000-4:2006[41], definition 4-30.

3.1.2

Measuring pressure meteringpressure the fluid pressure in the flowmeter associated with the indicated volume under flow conditions.

3.1.3

Mean velocity within the meterbody the fluid flow is divided by the cross-sectional area of the body.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 57 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4006

Cited by

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