We have supplied an API 650 storage tank in loose plate to a site in north Alberta canada. Plates are 350WT cold weather steel. we provided whole MTRs to client but we can not exactly tell them each part made out of exactly which heat #. they refer us generally to appendix n of API 650 and claim that there should be exact piece mark trace-ability for each piece of plate. is it true? I think what they claim is an ASME VIII requirement not API650. am I right? How to convince them.
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