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JJG 518-2023 English PDF

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JJG 518-2023: Pitot Tubes
Status: Valid

JJG 518: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 518-2023English439 Add to Cart 4 days [Need to translate] Pitot Tubes Valid JJG 518-2023
JJG 518-1998English359 Add to Cart 3 days [Need to translate] Pitot Tubes Obsolete JJG 518-1998
JJG 518-1988EnglishRFQ ASK 3 days [Need to translate] Verification Regulation of Pitot Statics Tubes Obsolete JJG 518-1988

Standard similar to JJG 518-2023

JJG 249   JJG 404   JJG 134   

Basic data

Standard ID JJG 518-2023 (JJG518-2023)
Description (Translated English) Pitot Tubes
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 20,291
Date of Issue 2023-03-15
Date of Implementation 2023-09-15
Issuing agency(ies) State Administration for Market Regulation

JJG 518-2023: Pitot Tubes

---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.
National Metrology Verification Regulations of the People's Republic of China JJG 518-2023 pitot tube Pitot Tubes Released on 2023-03-15 2023-09-15 Implementation Released by the State Administration for Market Regulation Pitot tube verification regulations Pitot Tubes Replace JJG 518-1998 Responsible unit: Meteorological Pressure Meteorological Committee of National Meteorological Measuring Instruments Measuring Technology Committee Subcommittee Main drafting unit: Meteorological Observation Center of China Meteorological Administration China Institute of Metrology AVIC Beijing Great Wall Metrology and Testing Technology Research Institute Participating in the drafting unit: Xinjiang Meteorological Technology and Equipment Support Center Jiangsu Meteorological Observation Center This regulation entrusts the Meteorological Pressure Sub-Technical Committee of the National Meteorological Measuring Instruments Measuring Technology Committee committee responsible for explaining The main drafters of this regulation: Liu Xin (Meteorological Observation Center of China Meteorological Administration) Cui Lishui (National Institute of Metrology) Li Songkui (Meteorological Observation Center of China Meteorological Administration) Wang Yi (Beijing Great Wall Metrology and Testing Technology Research Institute of AVIC) Participating drafters: Cao Peng (National Institute of Metrology) Wu Ning (Xinjiang Meteorological Technology Equipment Support Center) Zhang Zheng (Jiangsu Meteorological Observation Center)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References(1) 3 Terms and units of measurement(1) 3:1 Terminology(1) 3:2 Units of measurement(1) 4 Overview(1) 5 Metrological performance requirements (2) 5:1 Pitot tube calibration factor(2) 5:2 Repeatability(2) 6 General technical requirements (3) 6:1 L-shaped pitot tube (3) 6:2 S-type pitot tube (3) 7 Measuring Instrument Control(3) 7:1 Test conditions (3) 7:2 Verification items (4) 7:3 Verification method (4) 7:4 Processing of verification results (6) 7:5 Verification cycle (6) Appendix A Standard pitot tube wind speed calculation method (7) Appendix BL Type Standard Pitot Tube Verification Record Format (8) Appendix CL-type working grade Pitot tube (S-type Pitot tube) verification record format (9) Appendix D Verification Certificate/Verification Result Notification Inner Page Format (10)

Introduction

JJF1002 "Rules for Writing National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions", JJF1059:1 "Assessment and Expression of Measurement Uncertainty" together constitute the basic series supporting the revision of this regulation specification: Compared with JJG 518-1998, the major technical changes in this regulation are as follows except editorial modifications: --- Added references (see Chapter 2) and terms and units of measurement (see Chapter 3); ---Measurement performance requirements for L-type standard pitot tube, L-type working grade pitot tube and S-type pitot tube Provisions, increasing the measurement range and repeatability (see Chapter 5); --- The requirements for external dimensions have been deleted from the general technical conditions (see Chapter 6); --- Refined the standards for testing different types of pitot tubes, modified the wind tunnel, differential pressure gauge and supporting environmental equipment In addition, the technical requirements for the test environment have been increased (see 7:1); --- Delete the measurement of pitot tube size, included angle, total pressure hole diameter, static pressure hole diameter, etc:; --- Refined the verification method (see 7:3); ---Changed the verification period of Pitot tube (see 7:5); --- Deleted Appendix 3; --- Added the standard pitot tube wind speed calculation method (see Appendix A); --- Refined the verification record format (see Appendix B, Appendix C); --- Refined the information and format of the inner page of the verification certificate/verification result notification (see Appendix D): The previous releases of this regulation are as follows: ---JJG 518-1998: Pitot tube verification regulations

1 Scope

This regulation applies to the initial verification, follow-up verification and in-use inspection of L-type pitot tubes and S-type pitot tubes:

2 References

This procedure references the following documents: JJF1001-2011 general measurement terms and definitions For dated references, only the dated version applies to this regulation; for undated references document, its latest version (including all amendments) applies to this regulation:

3 Terminology and units of measurement

3:1 Terminology A set of holes for measuring hydrostatic pressure: 3:1:2 total pressure tapping Orifice for measuring the stagnation pressure of a fluid: 3:1:3 Differential pressure The pressure difference between the total pressure port and the static pressure port: 3:2 Units of measurement 3:2:1 The calibration coefficient of Pitot tube is a dimensionless constant, expressed as α: 3:2:2 The legal measurement unit of the differential pressure value measured by the pitot tube is Pascal, and the symbol is Pa:

4 Overview

A pitot tube is a tubular device that determines the fluid flow rate by measuring the pressure difference between the total fluid pressure and the static pressure: It is often used in conjunction with a differential pressure gauge: According to the different shape and structure of pitot tube, it can be divided into L-type pitot tube and S-type pitot tube: Host two: The L-shaped pitot tube is composed of a rod and a cylindrical probe, and the rod and the probe are connected vertically: One side of the right angle is the measuring head, The total pressure port is located on the top of the probe, and the static pressure port is located on one or more cross-sections around the probe, from the static pressure port to the total pressure port: The part of the hole is called the nose end, and the shape of the nose end has three types: spherical, conical and elliptical; the other side of the right angle is a strut, on which There are directional rods, total pressure joints and static pressure joints: The shape and structure of the L-shaped pitot tube is shown in Figure 1:

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