Standard No.:	GB/T 26953-2025
English Name:	Non-destructive testing of welds - Penetrant testing - Acceptance levels
Chinese Name:	焊缝无损检测 渗透检测 验收等级
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR, SAC
Issued on:	2025-10-31
Implemented on:	2026-2-1
Status:	to be valid
Superseding:	GB/T 26953-2011 Non-destructive testing of welds—Penetrant testing of welds—Acceptance levels
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1 business day

GB/T 26953-2025 Non-destructive testing of welds - Penetrant testing - Acceptance levels 1 Scope This document specifies acceptance levels for indications from surface breaking imperfections in metallic welds detected by penetrant testing. The acceptance levels are primarily intended for use during manufacture examination, but where appropriate, they can be used for in-service inspection. The acceptance levels in this document are based on detection capabilities that can be expected when using techniques specified in ISO 3452 series and parameters recommended in Annex A. The acceptance levels can be related to welding standards, application standards, specifications, or codes. Such a relationship is shown in ISO 17635 for ISO 5817 and ISO 10042. Acceptance levels for grouped indications are not covered by this document. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3452-1 Non-destructive testing - Penetrant testing - Part 1: General principles Note: GB/T 18851.1-2024, Non-destructive testing - Penetrant testing - Part 1: General principles (ISO 3452-1:2021, IDT) ISO 3452-2 Non-destructive testing - Penetrant testing - Part 2: Testing of penetrant materials Note: GB/T 18851.2-2024, Non-destructive testing - Penetrant testing - Part 2: Testing of penetrang materials (ISO 3453-2:2021, MOD) ISO 12706 Non-destructive testing - Penetrant testing - Vocabulary Note: GB/T 34628-2017, Non-destructive testing of welds - General rules for metallic materials (ISO 17635:2016, IDT) ISO/TS 18173 Non-destructive testing - General terms and definitions Note: GB/T 20737-2006, Non-destructive testing - General terms and definitions (ISO/TS 18173:2005, IDT) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/TS 18173, ISO 12706, and the following apply. 3.1 linear indication indication having a length greater than three times its width

Contents Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Testing parameters 5 Acceptance levels Annex A (informative) Recommended testing parameters Bibliography