Dear Experts,
We have a Piping Component(Thickness 9.5mm), named MIXER(Sour Service & Lethal) which is coming in line with Pipeline.
1. The Data Sheet of this Mixer refers to Calculation part as per ASME Sec VIII, Div 1 , 2010 Ed.
2. The fabrication, inspection, testing refers to ASME B 31.3.
Query: Client is requesting to do Post Weld Heat Treatment for all the Weld joints as service is Lethal(UW-2 of ASME Sec VIII, Div 1 ).
We tried to convince Client stating that this requirement of PWHT is not required as per ASME B 31.3 as this is not a Pressure Component(U-1(c)(2)(e), ASME Sec VIII, Div 1) and moreover, only the Calculation part of MIXER has been considered in accordance to ASME Sec VIII, Div 1.
Client still insisit for PWHT of all related weld joints as the Process stream of this mixer has been considered "LETHAL", hence it is applicable to MIXER too. The MIXER is completed, painted and recieved at our end from Supplier without PWHT.
Please provide your technical support to justify the Query and what further appropriate action can be considered.
Thanks & Regards
Vino P Varghese
Doha- Qatar
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