GB/T 18603-2023Technical requirements of measuring systems for natural gas (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 18603-2014 "Technical Requirements for Natural Gas Metering Systems". Compared with GB/T 18603-2014, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows:

a) Changed the definitions of metering stations, metering systems, fixed assignments, and variable assignments (see 3.3, 3.2, 3.10.1, 3.10.2, 2014 edition 3.1, 3.3, 3.13.1, 3.13.2); added terms and definitions for metering circuits, data acquisition and processing devices, and natural gas real flow calibration (See 3.1, 3.4, 3.9); deleted terms and definitions of flow computer, conversion device, pressure, temperature, dry basis (see 2014 edition 3.6, 3.7, 3.10, 3.11, 3.14).

b) Added gas quality requirements (see 4.2); changed equipment selection requirements in extreme environments (see 4.6.4, 2014 version 4.6.4); deleted the requirements for quality management system (see 4.8 of the 2014 edition); changed the requirements for vent design (see 4.7, 2014 edition 4.6.6); Added outage requirements (see 4.9).

c) The requirements for other devices supporting the metering system have been changed (see 5.1.1.3, 5.1.1.3 of the 2014 edition); the metering pipeline has been changed Requirements for installing small-diameter bypass pipes and valves on one side of the upstream stop valve (see 5.1.2.6, 5.1.2.6 of the 2014 edition); added Relevant requirements for standard nozzle flow meters and channel flow meters (see 5.1.5.2, 7.2.9, 7.2.10, 8.4.3.7, 8.4.3.8, 10.2.8, 10.2.9); Change the orifice flowmeter to a standard orifice flowmeter (see 5.1.2.2, 7.2.3, 8.4.3.1, 2014 version of 5.1.2.2, 7.2.7, 8.4.3.6); deleted the requirement for conversion device (see 5.1.5.3, 10.3 of the 2014 edition); added data acquisition and processing device requirements for placement (see 5.1.5.3, 10.3); changed the requirements for the depth of thermometer sleeve insertion into the pipeline (see 5.2.4.4, 2014 edition 5.2.4.4).

d) Added the overall requirements for using offline or assignment methods to measure calorific value (see 6.1); changed the requirements for installing processing equipment (See 6.2.2, 6.2.2 of the 2014 edition); Added requirements for the cumulative sampling system (see 6.2.2); Changes to the gas chromatograph or the Requirements for calorimeter performance evaluation (see 6.3.1.2, 6.3.1 of the 2014 edition); added the selected assignment method when using Evaluation criteria before or when the assignment source changes [see 6.5.3a)]; Added the assignment method available for Class A metering systems to obtain heat Relevant requirements for quantity or composition data [see 6.5.3d), Chapter 6 of the 2014 edition].

e) The installation requirements for vortex flowmeters are deleted (see 7.2.5 of the 2014 edition).

f) Delete the relevant requirements for vortex flowmeters in the test and calibration procedures (see 8.4.3.3 of the 2014 edition); delete the The uncertainty caused by differences in installation conditions should not exceed the requirement of 0.3% (see 8.4.4 of the 2014 edition); changed the gas chromatograph Instrument performance related requirements (see 8.4.6.5, 2014 version of 8.4.6.5).

g) Added measurement system performance evaluation requirements (see 9.3).

1 Scope

This document specifies the general requirements, design and construction, calorific value measurement, and Technical requirements for reliability and calibration, commissioning and trial operation, acceptance, operation and maintenance.

This document applies to designs with a throughput capacity of not less than 100m3/h (under standard reference conditions) and a working pressure of not less than 0.1MPa (gauge pressure). Natural gas metering station trade metering system.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 3836.1 Explosive atmosphere Part 1: General requirements for equipment

GB/T 3836.2 Explosive atmospheres Part 2: Equipment protected by flameproof enclosure "d"

GB/T 3836.3 Explosive atmospheres Part 3: Equipment protected by increased safety type "e"

GB/T 3836.4 Explosive atmospheres Part 4: Equipment protected by intrinsically safe type "i"

GB/T 5274.1 Preparation of mixed gases for gas analysis calibration Part 1: Preparation of first-level mixed gases by weighing method

GB/T 10248 Static volume method for preparation of mixed gases for gas analysis calibration

GB/T 11062 Calculation method for calorific value, density, relative density and Wobbe index of natural gas

GB/T 13610 Gas chromatography method for composition analysis of natural gas

GB/T 17626.1-2006 General introduction to electromagnetic compatibility testing and measurement technology immunity testing

GB/T 17626.3 Electromagnetic compatibility testing and measurement technology Radio frequency electromagnetic field radiation immunity test

GB/T 17626.6 Electromagnetic compatibility test and measurement technology Conducted disturbance immunity induced by radio frequency fields

GB/T 17626.9 Electromagnetic compatibility test and measurement technology pulse magnetic field immunity test

GB/T 17747 (all parts) Calculation of natural gas compression factor

GB 17820 Natural gas

GB/T 18604 Measuring natural gas flow with gas ultrasonic flow meter

GB/T 21391 Gas turbine flowmeter for measuring natural gas flow

GB/T 21446 Measuring natural gas flow using standard orifice flowmeter

GB/T 22723 Determination of natural gas energy

GB/T 27894 (all parts) Determination of composition of natural gas by gas chromatography and calculation of related uncertainties

GB/T 30490 Natural gas automatic sampling method

GB/T 30491.1 Calculation of thermodynamic properties of natural gas Part 1: Gas phase properties in gas transmission and distribution

GB/T 34166 Use standard nozzle flow meter to measure natural gas flow

GB/T 35186 Natural gas metering system performance evaluation

GB/T 37124 Gas quality requirements entering long-distance natural gas pipelines

GB 50251-2015 Gas pipeline engineering design specifications

GB 50540-2009 Construction specifications for process pipeline engineering in oil and gas stations