| Dear members, In all these arguments one imp aspect remains ignored, the very purpose of a thermocpuple, TC. All the requirements given in B31.3, Shell DEP, Aramco SP etc are the minimum requirements. What we have to ensure is that all the area required to be heat treated is indeed heated and soaked as specified. It then becomes obvious that to meet this requirement you may need some additional TCs at certain locations whereby all required area gets speicified heat treatment. Sometimes I have used 6 to 8 TCs to satisfy myself on adequacy of HT because of the job geometry. Regards, Shashank Vagal --- On Fri, 23/9/11, Ramchandra vichare <vicharerke@indiatimes.com> wrote:
From: Ramchandra vichare <vicharerke@indiatimes.com>
Subject: [MW:12507] Requirement of No. of Thermocouples.
To: materials-welding@googlegroups.com
Date: Friday, 23 September, 2011, 12:39 PM
Dear Experts, 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 -- To post to this group, send email to materials-welding@googlegroups.comTo unsubscribe from this group, send email to materials-welding+ unsubscribe@googlegroups.comFor more options, visit this group's bolg at http://materials-welding.blogspot.com/The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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