T/SCTX G013-2024 High-temperature pressure-bearing heat exchanger helium shield leak detection method

Scope

Scope: This document specifies the leak detection method for helium shielding technology of heat exchangers under high-temperature pressure conditions. This document is applicable to leak detection of heat exchangers in production and in use, and can be used to identify leakage sites and measure leakage rates. Main technical content: With the rapid development of the national economy, the accuracy requirements for leak detection of large-scale pressure equipment, especially heat exchangers, are becoming increasingly high. At present, some enterprises have put forward requirements for vacuum helium shielding detection under high temperatures. However, NB/T47013.8-2012 "Non-destructive testing of pressure equipment - Part 8: Leak detection", GB/T36176-2018 "Vacuum technology - Helium mass spectrometry vacuum leak detection method", GB/T32218-2015 "Vacuum technology - Leak rate test method for vacuum systems", and GB/T15823-2009 "Helium leak detection method for non-destructive testing" do not consider the impact of high-temperature conditions on the tested components (structures and materials) and detection instruments, and are not suitable for high-temperature tested components. Therefore, referring to GB/T41822-2022 "Thermal helium leak detection method for high-temperature pressure components of nuclear fusion reactors", this method is specifically developed for Appendix F of NB/T47013.8-2012 "Non-destructive testing of pressure equipment - Part 8: Leak detection", helium mass spectrometry leak detection - shielding technology, to supplement the existing provisions and provide a reference for leak detection of pressure equipment in units within the association.

Development Information

Related Standards