Mr.Vichare, The no. of thermocouple for PWHT, it is no written any where in the code but ones the procedure is approved, it should be follwed. if you whant change the no of thermocouple you can reverse the procedure. But normaly what is the client requirment that should be follwed, like thermocuople type and distence between thermocouple, heating & cooling rate, Unrestricted heating & cooling rate and etc.... I have seen that diffrent procedure one is requried up to 2" 1thermocouple, 2" to 4" two and 6" to 18" three and more ...... other one procedure up to 8" one, 8" to 24" two and etc.... Regards Jesti
--- On Fri, 9/23/11, 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, September 23, 2011, 12:09 AM
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.
|
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For 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.
No comments:
Post a Comment