GB/T 33440-2021General requirements for interchangeability of natural gas (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB /Z 33440-2016 "General Requirements for Interchangeability of Natural Gas Entering Long-distance Pipeline Networks", and is consistent with GB /Z 33440-2016 In addition to editorial changes, the main technical changes are as follows:

--- Changed the scope of the standard, deleted "entering the long-distance pipeline network", and deleted the content of safety tips (see Chapter 1,:2016 edition of Chapter 1);

--- Changed the terms and definitions "high calorific value" and "Wobbe index", deleted "combustion reference conditions" (see 3.1, 3.2,:2016 edition 3.1, 3.2, 3.3);

--- Changed the term and definition "Wobbe Index Volatility Range", and changed "Difference" to "Relative Deviation" (see 3.3, 3.4 of the:2016 edition);

--- Changed the suggested range of Wobbe index, and changed the upper limit from 53.81MJ/m3 to 53.80MJ/m3 (see 4.1, Chapter 4 of the:2016 edition);

--- Changed the regulations on the fluctuation range of the Wobbe index, from "should be ±5%" to "<=5%", and carried out the adjustment of the fluctuation range of the Wobbe index. Description (see 4.1, Chapter 4 of the:2016 edition);

--- Deleted the index requirements for hydrogen sulfide, total sulfur and water dew point (see Chapter 4 of the:2016 edition);

--- Added "Other technical indicators of natural gas shall be implemented according to GB 17820" (see 4.2);

--- Deleted "The determination of the natural gas composition on which it is based shall be performed in accordance with GB/T 13610" (see 5.1 of the:2016 edition);

--- Deleted the provisions on the determination methods of hydrogen sulfide, total sulfur, and water dew point (see 5.2, 5.3, and 5.4 of the:2016 edition).

1 Scope

This document specifies the requirements for the interchangeability of the replacement gas source/mixed gas source with the existing gas source.

This document applies to conventional natural gas, coalbed methane, shale gas, coal-to-synthetic natural gas, and liquefied natural gas.

2 Normative references

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

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

GB/T 13609 Guidelines for Natural Gas Sampling

GB 17820 Natural gas

3 Terms and Definitions GB/T 11062 and the following

terms and definitions apply to this document.