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Re: [MW:13822] RE: 13803] Post Weld heat treatment & No of thermocouples regarding

By Materials & Welding
1. Thermocouple shall be fitted directly to the equipment to ensure that all portions are properly and uniformly heat-treated without the presence of detrimental thermal gradients.
2.Thermocouples shall be firmly attached to the vessel at a maximum of 4.6 meter intervals in both longitudinal and circumferential directions.   
3.Thermocouples shall be evenly spread on the vessel external surface, including top, bottom, sides and heads; also the additional thermocouples shall be located at any major change in wall thickness.
Thermocouples shall be made from nickel-chromium/nickel aluminium wire to BS 1041, Part IV or equivalent. Certification shall be made available for each reel of wire utilized and shall indicate a tolerance of less than ± 0.5% throughout the temperature range 400ºC to 800ºC.
 
Kavin Murugam
 
 

From: Eswaran samikannu <eswaranaws@yahoo.co.in>
To: materials-welding@googlegroups.com
Sent: Saturday, March 3, 2012 9:38 AM
Subject: Re: [MW:13812] RE: 13803] Post Weld heat treatment & No of thermocouples regarding

Good Day to you,
 
Thanks Mr.Lakshman Kumar & Mr.Hemu Manivannan,  I also same point of view in  heating ,cooling & Soaking time and temperature we can follow ASME Codes.Now my concern is number of thermocouples to be connected to each joint and location of thermocouples to monitor the joint temperature. Any refrence / Recomendation from ASME Codes / API Codes.Other than AWS Codes.
 
Thanks
Regards
S.Eswaran 
From: Lakshman Kumar.B <lakshmankumar4@gmail.com>
To: materials-welding@googlegroups.com
Sent: Friday, 2 March 2012 4:58 PM
Subject: [MW:13806] RE: 13803] Post Weld heat treatment & No of thermocouples regarding

Hi,
 
As per API 6A, it was clearly specified PWHT shall be as per WPS only,
 
PWHT shall be carried as per the written procedure(which shall specify the tolerance in the temperature also) by the manufacturer and complying to the WPS.
 
Further WPS shall be in accordance with ASME Sec IX.
So as per my view we can refer for ASME Sec VIII Div -1 UW 40,( For requirements) and UCS 56, UNF 56, UHT 56, UHA 56, (for the temperature range, thickness limits, soaking time, etc)
 
I hope we can follow ASME Sec VIII.
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Eswaran samikannu
Sent: Friday, March 02, 2012 11:59 AM
To: materials-welding@googlegroups.com
Subject: [MW:13803] Post Weld heat treatment & No of thermocouples regarding
 
Good day to all,
 
We are one of the authorised repairing & Manufacturer  of OEM Cameron, VG & Shaffer BOP and riser pipes , I want to know thermocouples location / No of thermocouples vs Pipe size according to API 6A /API 16A for localaised stress relief (PWHT), Any one have the standards let me know or inform where i can get the information.
 
Thanks
S.Eswaran 
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