With reference to the above mentioned subject , during Heat-treatment of Piping spool joints I insisit one of my vendor to used thermocouples as noted below:-
Up to 4"NB = 1 no.(Bottom side)
Above 4" to 8"NB= 2 nos.(top & Bottom)(say 180Deg.)
8" to 24"= 3 nos (120Deg)
Above 24" =4 nos.
and according to accepted Heattreatment Procedure it was alo acceptable but unfortunitaly delay in Heat treat the joint; vendor is not ready to follow Procedure due to the reseason referred above & no where written in ASME 31.3 regarding the requirement of Tharmocouples. Reauested experts to Guide guaide me why we are placing thromocouples? I think it is control soaking anyhow;let me tell were I will get ready reference and documentryevidence for requiremnt of Number of thermocouples? Is any effect during soaking time or any metallourgicval changes will be there if we use one thermocouple instead of above? . Pl be guaide in detail with documentry evidence.
Regards,
RK Vichare
Mumbai-India
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