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GB/T 43079.2-2023Specification for selection and matching of steel pipe flanges, gaskets and fasteners—Part 2: Class designated (English PDF)

钢制管法兰、垫片及紧固件选用规定第2部分：Class系列

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

September 7, 2023

Implementation date

April 1, 2024

Scope

GB/T 43079.2-2023 is the English-translated version of 钢制管法兰、垫片及紧固件选用规定第2部分：Class系列.

GB/T 43079.2-2023 is the Chinese standard "Specification for selection and matching of steel pipe flanges, gaskets and fasteners—Part 2: Class designated". Its scope clause reads: This document specifies the rules for the selection of Class series steel pipe flanges, gaskets, and fasteners that form a sealing pair.

This document applies to Class series steel pipe flanges stipulated in GB/T 9124.2-2019 and GB/T 13402-2019 and related Matching gaskets and fasteners. Its clauses include normative reference documents; terms and definitions.

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Document preview — GB/T 43079.2-2023

National Standard of the People's Republic of China

ICS: 23.040.60
Classification: J 15

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1 Scope
2 Normative reference documents
3 Terms and Definitions
4 Steel pipe flange selection
5 gasket selection
6 Fastener selection
7 Optional requirements for flange joints

1 Scope

This document specifies the rules for the selection of Class series steel pipe flanges, gaskets, and fasteners that form a sealing pair.

This document applies to Class series steel pipe flanges stipulated in GB/T 9124.2-2019 and GB/T 13402-2019 and related

Matching gaskets and fasteners.

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 4622.2 Wound gaskets for pipe flanges Part 2.Class series

GB/T 9124.2-2019 Steel pipe flanges Part 2.Class series

GB/T 9125.2 Fasteners for steel pipe flange connections Part 2.Class series

GB/T 9126.2 Non-metallic flat gaskets for pipe flanges Part 2.Class series

GB/T 9128.2 Metal ring gaskets for steel pipe flanges Part 2.Class series

GB/T 13402-2019 Large diameter steel pipe flange

GB/T 13403 Gaskets for large diameter steel pipe flanges

GB/T 13404 Non-metallic polytetrafluoroethylene coated gaskets for pipe flanges

GB/T 15601 Metal-coated gaskets for pipe flanges

GB/T 17186.1 Calculation method for pipe flange connections Part 1.Calculation method based on strength and stiffness

GB/T 17186.2 Calculation method for pipe flange connections Part 2.Calculation method based on leakage rate

GB/T 19066.2 Metal corrugated composite gaskets for pipe flanges Part 2.Class series

GB/T 19675.2 Flexible graphite composite reinforced gaskets for pipe flanges Part 2.Class series

GB/T 20801.1-2020 Pressure piping specification for industrial piping Part 1.General principles

GB/T 20801.4-2020 Pressure piping specification industrial piping Part 4.Fabrication and installation

GB/T 38343 Technical regulations for installation of flange joints

GB/T 39245.2 Metal toothed combination gaskets for pipe flanges Part 2.Class series

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 GC1 grade pressure pipeline gradeGC1piping

According to GB/T 20801.1-2020, pressure pipes are classified as GC1 grade.

3.2 GC3 grade pressure pipeline gradeGC3piping

In accordance with GB/T 20801.1-2020, pressure pipes classified as GC3.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 47414-2026|GB/T 47569-2026|GB/T 47763-2026|GB/T 12385-2025|GB/T 12459-2025|GB/T 13401-2025

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