The default arrangement per existing 11.4.1, is that test samples shall be taken from heat treated plate in the heat-treated condition. Exceptions are provided in 11.4.2 for plate shipped green with heat treat by fabricator, and in 11.4.3 with explicit purchaser approval. In those exceptional cases, samples are taken before plate heat treatment and the samples are given a simulated heat treatment. In those cases the purchaser is fully aware and accepts any risk of differences between the heat treatment applied to the plates and that applied to the coupons. However, when green plate is purchased by an intermediate business that heat treats the plate and resells the final product, the rules become less clear since the intermediate business acts in both purchaser and manufacturer roles. The ultimate purchaser of the finished heat treated plate deserves assurance that the coupons were processed by the uncompromised 11.4.1 process (unless he approves otherwise) regardless of whether or not an intermediate business was involved. Current A20 rules with the just-described multiple roles do not provide clear assurance. The clarifications in this work item provide clear rules to ensure that ultimate purchasers are protected.
Keywordsgeneral delivery requirement; pressure containing parts; pressure vessel steels; steel plates; steel plates for pressure vessel applications;
Ballot Item Approved as A20/A20M-2015 and Pending Publication