Standard No.:	NB/T 47013.8-2025
English Name:	Non-destructive testing of pressure equipment - Part 8: Leak testing
Chinese Name:	承压设备无损检测 第8部分：泄漏检测
Professional Classification:	NB    Professional Standard - Energy
Source Content Issued by:	China Energy Aminidstration
Issued on:	2025-12-18
Implemented on:	2026-6-18
Status:	to be valid
Superseding:	NB/T 47013.8-2012 Nondestructive testing of pressure equipments - Part 8: Leak Testing
Target Language:	English
File Format:	PDF
Word Count:	18500 words
Translation Price(USD):	555.0
Delivery:	via email in 1~3 business day

NB/T 47013.8-2025 Non-destructive testing of pressure equipment - Part 8: Leak testing English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS CCS H Professional Standard of the People’s Republic of China NB/T 47013.8-2025 Replace NB/T 47013.8-2012 Non-destructive testing of pressure equipment - Part 8: Leak testing 承压设备无损检测 第8部分：泄漏检测 (English translation) Issue date: 2025-12-18 Implementation date: 2026-06-18 Issued by the National Energy Administration Contents Foreword Introduction 1 Scope 2 Normative References 3 Terms and Definitions 4 General Requirements 5 Testing 6 Evaluation of Results 7 Records and Reports Annex A (Normative) Bubble Leak Detection – Direct Pressurization Method Annex B (Normative) Bubble Leak Detection – Vacuum Hood Method Annex C (Normative) Halogen Diode Leak Detection Annex D (Normative) Helium Mass Spectrometer Leak Detection – Sniffer Probe Method Annex E (Normative) Helium Mass Spectrometer Leak Detection – Tracer Probe Method Annex F (Normative) Helium Mass Spectrometer Leak Detection – Hood Method Annex G (Normative) Helium Mass Spectrometer Leak Detection – Leak Rate Measurement of Nitrogen-Filled Containers Annex H (Normative) Pressure Change Leak Detection Annex I (Normative) Thermal Conductivity Leak Detection Annex J (Normative) Gas Pipeline Leak Detection Foreword This document has been drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization – Part 1: Rules for the structure and drafting of standardizing documents". NB/T 47013 "Nondestructive testing of pressure equipment" currently consists of the following 21 parts: Part 1: General requirements; Part 2: Radiographic testing; Part 3: Ultrasonic testing; Part 4: Magnetic particle testing; Part 5: Penetrant testing; Part 6: Eddy current testing; Part 7: Visual testing; Part 8: Leak testing; Part 9: Acoustic emission testing; Part 10: Ultrasonic time-of-flight diffraction testing; Part 11: Radiographic digital imaging testing; Part 12: Magnetic flux leakage testing; Part 13: Pulsed eddy current testing; Part 14: Radiographic computed radiography testing; Part 15: Phased array ultrasonic testing; Part 16: Infrared thermographic testing; Part 17: Magnetic memory testing; Part 18: Array eddy current testing; Part 19: Electromagnetic acoustic transducer (EMAT) testing; Part 20: Ultrasonic guided wave testing; Part 21: Alternating current field measurement (ACFM) testing. This document is Part 8 of NB/T 47013. This document replaces the content of NB/T 47013.8—2012 "Nondestructive testing of pressure equipment – Part 8: Leak testing". Compared with NB/T 47013.8—2012, the main technical changes are as follows: Added Annex G (normative) "Helium mass spectrometer leak testing – Leak rate measurement of heliumfilled containers"; Removed the former Annex G (normative) "Ammonia leak testing technology"; Removed the former Annex H (normative) "Acoustic leak testing technology for pipelines"; Removed the former Annex K (normative) "Ultrasonic leak testing technology"; Added Annex J (normative) "Leak testing of gas pipelines"; Revised some of the content on leak determination. Please note that certain contents of this document may be subject to patents. The issuing authority of this document is not responsible for identifying such patents. This document has been proposed and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262). The previous editions of the document replaced are as follows: —— NB/T 47013.8—2012; —— This is the first revision. Nondestructive testing of pressure equipment – Part 8: Leak testing 1 Scope 1.1 As a part of NB/T 47013, this document specifies leak testing methods for pressure equipment. 1.2 This document is applicable to the nondestructive leak testing of pressure equipment during manufacture and in service, and can be used to determine leak locations and measure leak rates. 1.3 The various test methods and technical requirements specified in this document are respectively stipulated in the respective annexes. 2 Normative references The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies. GB 11533 Standard for logarithmic visual acuity charts GB/T 12604.7 Nondestructive testing – Terminology – Leak testing GB/T 32074 Nondestructive testing – Test method for hydrogen leak testing GB/T 33643 Nondestructive testing – Test method for acoustic emission leak detection GB/T 34638 Nondestructive testing – Test method for ultrasonic leak detection NB/T 47013.1 Nondestructive testing of pressure equipment – Part 1: General requirements NB/T 47013.7 Nondestructive testing of pressure equipment – Part 7: Visual testing 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 12604.7 apply. 4 General requirements 4.1 General The general requirements for leak testing shall comply with the relevant provisions of NB/T 47013.1 and, in addition, with the provisions of 4.2 to 4.4. 4.2 Testing personnel Leak testing personnel shall have uncorrected or corrected near (distance) vision and far (distance) vision of not less than 4.8, and the test method shall comply with the provisions of GB 11533. 4.3 Procedure specification 4.3.1 A leak testing procedure specification shall be developed in accordance with the requirements of NB/T 47013.1. The procedure specification shall include at least the following content: a)Scope of application; b) Referenced regulations and standards; c) Qualification of testing personnel; d) Testing equipment and materials; e) Testing conditions (temperature, gas or concentration, etc.); f) Test pressure and pressure holding time; Annex B (Normative) Bubble leak testing – Vacuum hood method B.1 General The bubble leak testing – vacuum hood method is a technique suitable for detecting leaks in pressure components that cannot be pressurised directly. The method involves applying a bubbleforming solution to a local area of the pressure component shell and then creating a pressure differential in that local area using a vacuum hood. If a leak occurs, bubbles will be generated on the lowpressure side, thereby enabling the leak location to be determined. B.2 Scope This testing method is a coarse leak method with low sensitivity requirements. It is generally used only to determine whether a test object leaks, without quantitative analysis. B.3 General requirements B.3.1 General The general requirements for this testing method shall comply with the relevant provisions of NB/T 47013.1 and this document, and in addition with the provisions of B.3.2 to B.3.5. B.3.2 Procedure specification B.3.2.1 Essential factors include the following: a)Bubbleforming solution (grade or model number); b) Surface temperature (the minimum temperature of the test object during testing shall comply with the relevant provisions of pressure testing; the maximum or minimum temperature during testing shall be consistent with the testing method); c) Surface condition; d) Lighting conditions; e) Personnel skill requirements (when necessary). B.3.2.2 General factors include the following: a)Vacuum pump; b) Vacuum hood (size and shape); c) Vacuum holding time; d) Vacuum test pressure; e) Pressure gauge; f) Postcleaning method; g) Acceptance criteria; h) Personnel qualification. B.3.3 Bubbleforming solution