You mean pre heating or PWHT. Normally pre heating can be performed by Butane gas, this tempreature will vary from 20 deg,C to 100 deg.c and PWHT can be performed by using thermocouples using electric resistance, tempreature will be more than 595 deg C to 615 deg. C for P1 material.
V.Ravishanker.
Senior QA/QC Engineer.
Bahrain
From: manpreet <manpreetsin88@rediffmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, 16 April, 2010 11:44:25 AM
Subject: [MW:4821] electric resistance heating
Dear All
what are the applications of electric resistance heating
in preheating?
Can it be replaced by some other method?
LPG-LNG pipeline project for P1 group & Gr no, 2
To: materials-welding@googlegroups.com
Sent: Fri, 16 April, 2010 11:44:25 AM
Subject: [MW:4821] electric resistance heating
Dear All
what are the applications of electric resistance heating
in preheating?
Can it be replaced by some other method?
LPG-LNG pipeline project for P1 group & Gr no, 2
 |
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