Are HIC+SSC tests required for the welds?
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Recently, the technical specifications provided by the client for one of the company’s projects required that the materials undergo HIC+SSC testing. There are no explicit requirements regarding welds, and NACE MR0175 also does not specify that welds need to be tested. So, is it necessary to test the welds? If there have already been welding procedure evaluations conducted in the past using the same material, can those cover the welds in this case? If anyone knows, please let me know. Thank you!
The piping needs to be processed, and a welding procedure qualification must also be carried out. The requirements for this welding procedure qualification should be specified in the design’s construction technical specifications. Welding procedure qualifications that have already been conducted using the same material can be applied to the welds in this case [if the piping material, welding materials, welding method, heat treatment conditions, and corrosive environment are all the same, then it is possible to use those previous qualifications]
I’ve been very confused about this aspect; there are also disagreements among our designers and welding technicians. Thank you so much for your help!
MR 0175 is actually a requirement regarding material selection; designers require HIC and SSC assessments of materials, but these are not evaluations for selecting materials per se, rather they are verification assessments carried out on materials that have been retested. For welds, the equipment manufacturer should have successful application records of similar projects; secondly, it depends on how the design documents specify whether this requirement can be covered or waived.
The welding process must ensure the appropriate corrosion resistance; whether the existing assessments are sufficient depends on the provisions of the standards.
It depends on which standard is used to determine whether it is covered I have also been very confused about related issues.