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GB/T 47400-2026X-ray digital imaging method for the inspection of welded joints in polyethylene pipes for petrochemical use (English PDF)

石油化工用聚乙烯管道焊接接头X射线数字成像检测方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

October 1, 2026

Scope

GB/T 47400-2026 is the English-translated version of 石油化工用聚乙烯管道焊接接头X射线数字成像检测方法.

GB/T 47400-2026 is the Chinese standard "X-ray digital imaging method for the inspection of welded joints in polyethylene pipes for petrochemical use". Its scope clause reads: This document provides the symbols and explanations for X-ray digital imaging inspection of welded joints in polyethylene (PE) pipes used in petrochemicals.

Generally, it is necessary to... Requirements, testing equipment and materials, testing methods, defect identification and measurement, result description and judgment, testing records and reports.

This document applies to X-ray examination of thermofusion welded joints and electrofusion welded joints of polyethylene pipes with nominal wall thicknesses of 2mm to 100mm.

Linear digital imaging detection. This document also applies to X-ray digital imaging inspection of welded joints in other thermoplastic pipes. Its clauses include terms and definitions.

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Document preview — GB/T 47400-2026

National Standard of the People's Republic of China

ICS: 71.120
Classification: G 94

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

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Symbols and Explanations
5 General Requirements
6.Testing equipment and materials
7.Detection Methods 5.
8 Defect Identification and Measurement
9.Result Description and Judgment 10.
10.Test records and reports 11.
Appendix A (Normative) Wire-type image quality meter
Appendix B (Normative) Stepped aperture image quality meter
Appendix C (Informative) Typical Defect Atlas

1 Scope

This document provides the symbols and explanations for X-ray digital imaging inspection of welded joints in polyethylene (PE) pipes used in petrochemicals. Generally, it is necessary to...

Requirements, testing equipment and materials, testing methods, defect identification and measurement, result description and judgment, testing records and reports.

This document applies to X-ray examination of thermofusion welded joints and electrofusion welded joints of polyethylene pipes with nominal wall thicknesses of 2mm to 100mm.

Linear digital imaging detection.

This document also applies to X-ray digital imaging inspection of welded joints in other thermoplastic pipes.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 3323.2 Nondestructive testing of welds—Radiological inspection—Part 2.X-ray and gamma-ray techniques using digital detectors

GB/T 12604.2 Nondestructive Testing Terminology. Radiographic Testing

GB/T 12604.11 Nondestructive Testing Terminology. X-ray Digital Imaging Inspection

GB/T 19278 General Terminology and Definitions for Thermoplastic Pipes, Fittings and Valves

GB/T 23901.1 Nondestructive testing—Radiographic inspection—Image quality—Part 1.Determination of image quality values using a wire-type image quality meter

GB/T 23901.2 Nondestructive testing—Radiographic inspection—Image quality—Part 2.Determination of image quality values using a stepped aperture image quality meter

GB/T 23901.5 Nondestructive testing—Radiographic inspection—Image quality—Part 5.Image blurring by dual-wire image quality meters

Measurement

NB/T 47013.1 Non-destructive testing of pressure equipment – Part 1.General requirements

NB/T 47013.11-2023 Non-destructive testing of pressure equipment - Part 11.Digital radiographic testing

3 Terms and Definitions

The terms and definitions defined in GB/T 3323.2, GB/T 12604.2, GB/T 12604.11 and GB/T 19278, as well as the following terms and definitions, apply.

This document.

3.1 Buttfusion joint

During the welding of polyethylene pipes, a special heating device is used to heat and melt the surfaces to be welded, and then press and fuse them together to form a continuous weld.

Connecting bodies.

3.2 Electrofusion joint

During polyethylene pipe welding, the resistance wire pre-embedded inside the polyethylene electrofusion sleeve is heated by energizing it, causing the polyethylene electrofusion sleeve to be inserted into the socket.

The polyethylene plastic layers on the outer surface of the polyethylene pipe inside the sleeve and the inner surface of the polyethylene electrofusion sleeve are fully melted, mixed, and fused together, forming a solid structure after cooling.

The connecting body (the structural form is shown in Figure 1).

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

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