GB/T 22723-2024Natural gas - Energy determination (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents".

This document replaces GB/T 22723-2008 "Determination of Energy of Natural Gas". Compared with GB/T 22723-2008, in addition to structural adjustments and in addition to editorial changes, the main technical changes are as follows.

a) Some terms and definitions have been changed (see Chapter 3, Chapter 3 of the 2008 edition);

b) Added requirements for measuring mass or volume of flowmeters with different measurement principles (see 6.2.2);

c) Deleted the provisions on volume conversion, verification or calibration, and data storage and transmission for gas measurement (see 6.4, 2008 edition).

6.5, 6.6);

d) The possible interfaces for energy determination have been changed (see Chapter 7, Chapter 7 of the 2008 edition);

e) Added instructions for the energy measurement implementation process, and changed the energy measurement strategy from a flowchart to a more operational clause list.

Out (see Chapter 8);

f) The method of assigning calorific value has been changed (see Appendix C, 8.2.1.5.1, 8.2.1.5.2, Chapter 9 of the 2008 edition).

This document is modified to adopt ISO 15112:2018 "Determination of energy content of natural gas".

This document has the following structural adjustments compared to ISO 15112:2018.

---6.1 corresponds to 7.2 in ISO 15112:2018;

---6.2.1, 6.2.2, 6.2.3 correspond to 6.1, 6.2, 6.3 in ISO 15112:2018; the 6.4,6.5,6.6;

---7.2 corresponds to 8.2 in ISO 15112:2018; 8.1 in ISO 15112:2018 is deleted;

---8.2 corresponds to 8.3 in ISO 15112:2018;

--- Chapter 9 corresponds to Chapter 10 of ISO 15112:2018;

--- Chapter 10 corresponds to Chapter 11 of ISO 15112:2018, of which 10.2 to 10.4 correspond to Chapter 11 of ISO 15112:2018 11.1~11.3, increased by 10.1;

--- Chapter 11 corresponds to Chapter 12 of ISO 15112:2018;

--- Appendix C corresponds to Chapter 9 of ISO 15112:2018, and adds Appendix G and Appendix L;

---The appendix numbers have been adjusted according to the order in which they appear in the text.

The technical differences between this document and ISO 15112:2018 and their reasons are as follows.

--- Added normative references GB/T 20604, GB/T 8423.4, JJF1001 (see Chapter 3) to adapt to my country's technical requirements Improve operability;

--- Added normative references to GB/T 19205 (see Table 1) to adapt to my country's technical conditions and improve operability;

--- Added normative references to GB/T 18603 (see 6.2.1, 7.1, 10.1) to adapt to my country's technical conditions and improve operability Sex;

--- Added normative reference SY/T 7552 (see 6.2.1) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 21446 (see 6.2.2.2) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 18604 (see 6.2.2.3) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 21391 (see 6.2.2.4) to adapt to my country's technical conditions and improve operability;

--- Added normative reference SY/T 6660 (see 6.2.2.5) to adapt to my country's technical conditions and improve operability;

--- Added normative reference SY/T 6659 (see 6.2.2.6) to adapt to my country's technical conditions and improve operability;

--- Added normative reference SY/T 7552 (see 6.2.2.7) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 34166 (see 6.2.2.8) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 13609 (see 6.2.3.1) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 35211 (see 6.2.3.2) to adapt to my country's technical conditions and improve operability;

--- Added normative reference GB/T 13610 (see 6.2.3.3) to adapt to my country's technical conditions and improve operability;

--- ISO 6976 (see 6.2.3.3) has been replaced with the normative reference GB/T 11062 to adapt to my country's technical conditions and improve the reliability of the product.

Operability;

--- Changed the description of volume or mass measurement (see Chapter 6, Chapter 6 of ISO 15112:2018), Volume or mass measurement the requirements of GB/T 18603 are cited for explanation;

--- Added requirements for flowmeters with different measurement principles to measure mass or volume (see 6.2.2.2 to 6.2.2.8);

--- Added the description of the calorific value assignment method (see 6.2.4), which includes the use of historical data assignment, spot test results assignment, value, calculation and assignment using associated site data, sampling and assignment by cumulative sampler, and online continuous sampling and test assignment;

--- Deleted the provisions for volume conversion, verification or calibration of gas measurement and data storage and transmission (see ISO 15112:2018 Chapter 6), which is inconsistent with the domestic situation;

--- Changed the "Energy determination" section (see Chapter 7, Chapter 7 of ISO 15112:2018), combining the description of the measurement principle GB/T 18603, according to the measurement method and equipment configuration, measurement accuracy level requirements determined by this standard, and different interfaces in response to the request, the possible interface of energy measurement was modified;

--- Added instructions for the implementation process of energy measurement, and changed the energy measurement strategy from a flowchart to a more operational clause list.

out (see 8.1);

--- Added the requirements for accuracy assessment in combination with GB/T 18603 (see 10.1);

--- Added the normative reference JJF1059.1 (see 10.3.1) to adapt to my country's technical conditions and improve operability;

--- 8.1 in ISO 15112:2018 (see 8.1 in ISO 15112:2018) has been deleted and expressed in terms for easier understanding;

--- Based on Chapter 9 and 8.2.1.5.1 and 8.2.1.5.2 of ISO 15112:2018, the method for assigning calorific value has been changed (see Appendix C).

The following editorial changes were made to this document.

--- Deleted Appendix A (informative) "Recommended instruments and methods for energy determination" in ISO 15112:2018;

--- Deleted Appendix I (informative) "Uncorrected data, deviation correction and final result illustration" in ISO 15112:2018;

--- Added Appendix L (informative) "Energy measurement result record sheet";

--- Changed references.

Introduction

In the late 1970s and early 1980s, foreign natural gas trade began to shift from volume measurement to energy measurement.

In addition to Sri Lanka, Central Asian countries and China, other major countries and regions in the world all use energy measurement for natural gas trade.

Accurate measurement is the basis for natural gas energy measurement. This document is the core standard for regulating natural gas energy measurement methods and is of great significance for guiding the the implementation of gas energy metering methods and the formulation of plans are of great significance.

This document is an important technical support document for natural gas energy measurement. This document is consistent with GB/T 18603 "Technical Requirements for Natural Gas Metering Systems".

The current natural gas measurement specifications and measurement system requirements in my country are combined with the JJF1993 "Technical Specifications for Natural Gas Energy Measurement" and other documents.

It can effectively guarantee the accuracy, effectiveness and traceability of energy measurement, and jointly support the implementation of natural gas energy determination and energy measurement.

Determination of natural gas energy

1 Scope

This document provides the principle of determining the energy of natural gas and stipulates the principle of determining the energy of natural gas at different natural gas interfaces.

The technology and measures needed to determine the energy value are applied to the production site, and the uncertainty evaluation method is given.

This document applies to energy determination in all natural gas energy determination systems from low pressure to high pressure.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to document.

GB/T 8423.4 Terminology of the petroleum and natural gas industry Part 4: Oil and gas measurement and analysis GB/T 11062 Calculation method for calorific value, density, relative density and Wobbe index of natural gas GB/T 13609 Guidelines for Natural Gas Sampling GB/T 13610 Composition analysis of natural gas - Gas chromatography GB/T 18603 Technical requirements for natural gas metering systems GB/T 18604 Measurement of natural gas flow using gas ultrasonic flowmeter GB/T 19205 Standard reference conditions for natural gas GB/T 20604 Natural Gas Vocabulary GB/T 21391 Measurement of natural gas flow using gas turbine flowmeters GB/T 21446 Measurement of natural gas flow using standard orifice flowmeters GB/T 34166 Measurement of natural gas flow using standard nozzle flowmeter GB/T 35211 Measurement of calorific value of natural gas - Continuous combustion method JJF1001 General metrological terms and definitions JJF1059.1 Evaluation and Expression of Measurement Uncertainty SY/T 6659 Measurement of natural gas flow using Coriolis mass flowmeter SY/T 6660 Measurement of natural gas flow using rotary positive displacement gas flowmeter SY/T 7551 Measurement of natural gas flow using channel flowmeter SY/T 7552 Selection Guide for Flow Meters for Natural Gas Trade Measurement

3 Terms and definitions

The terms and definitions defined in GB/T 20604, GB/T 8423.4, JJF1001 and the following apply to this document.

Energy

Under given conditions, the product of gas volume or mass and unit calorific value.

Note 1.Energy can also be called total energy.

Note 2.Energy is usually expressed in MJ.