[MW:13987] RE: 13985] PWHT OF P91 BY INDUCTION HEATING

Try to put metal plug dummy on both side of the joint to avoid heat losses for maintaining the temperature

Nagoor Meeran

L&T-KAPP

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sandeep monody
Sent: Saturday, March 24, 2012 5:37 PM
To: materials-welding@googlegroups.com
Subject: [MW:13985] PWHT OF P91 BY INDUCTION HEATING

 

Dear experts,

 

In my site we conducted a demonstration of PWHT on SA335 P91 material (OD-450mm X 70mm Thk) as our clients requirement and details as given below.

 

Heating/cooilng rate;-60 deg C,Holding temparature:-760deg C and holding time:-180minutes,Heating band width:-210mm and insulation band width 630mm,Heating method :-Induction heating

 

During pwht we observed a temparature difference on outside and inside of pipe more than 80 deg C.

 

Now problem is that client is not accepting this method and asking for uniform temparature in outside and inside of pipe.

 

How can i control temparature at both sides?

Is it possible a uniform temp on both side with induction heating?

 

Please give ur valueble advice in this matter.

 

 

Sandeep.

QC Engr

--
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.

This Message and its contents is intended solely for the addressee and is proprietary. Information in this mail is for L&T Business Usage only. Any Use to other than the addressee is misuse and infringement to Proprietorship of L&T Construction. If you are not the addressee please return the mail to the sender. L&T Construction.