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Re: [MW:14004] PWHT OF P91 BY INDUCTION HEATING

By Materials & Welding
Temperature differeancr is lesssthan 20-30 degree is acceptable.  how you can measure inside and out side temperature.you put 3 thermocouple 120 degree aprat out dide of the pipe and the temerature differeane max is 30 dedegree

On Sat, Mar 24, 2012 at 5:36 PM, sandeep monody <smv.monody@gmail.com> 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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