Thursday, February 14, 2013

Re: [MW:16766] Re: PWHT OF P91 BY INDUCTION HEATING

Dear sir,
 You have to provide  insulation to pipe inner surface to  protect the heat loss by convection. Marginal changes you  can observe.Additionally both end of the pipe you have to close to protect the free air movement. Zero temperature difference is not possible 10 to 15 degree may happen.You have to go ahead with induction method.
bijoy joseph
On Thu, Feb 14, 2013 at 2:42 PM, vineet kumar <vineet.rdb@gmail.com> wrote:
Dear ,

Attached procedure might help you.

Regards,
Vineet

On Saturday, March 24, 2012 5:36:40 PM UTC+5:30, sandeep monody wrote:
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

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