One of HEX involves following MOCs -
HEX tubes - SA 789 TYP 32205
Tubesheet -SA 266 CL 2 CS - Tube sheet IS cladded with TYP S32205 overlay.
Shell side - CS -SA 516 GR 70 - 75mm thk
Channel side - CS- SA 516 GR 70 - 75 mm thk
PWHT is required for Tube sheet to Shell welding and Tube sheet to Channel welding. These are butt welds with CS Weld metal .
PWHT is not required for Tube sheet to HEX Tube welding due to DSS tube to DSS cladding.
Pl advice for the care that shall be taken during PWHT of Tube sheet to Shell welding and Tube sheet to Channel welding.
Thanks and regards
Vishwas - IWE
International Welding Engineer
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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