Re: [MW:13991] PWHT OF P91 BY INDUCTION HEATING

Dear Mani/Balaji,

 

This was a demonstration of PHWT which we are going to follow on jobs,so client is not allowing to put wool inside.They want PHWT demo in the same manner ,which we are going to do on jobs. We had put metal dummy on both sides but no wool or coil.This is thermal power plant project and the acceptance codes are ASME sec I & ASME B31.1

 

Thanks &Regards

 

Sandeep.M.V

QC Engineer

On Mon, Mar 26, 2012 at 1:43 PM, E.S.Mani <maniesbk@gmail.com> wrote:

Dear sandeep,

 

Ya this is not acceptable. Because the temperature difference range is 732 Deg, C to 774 Deg C for P15E material as per B31.3 (2010 Edition).

 

I have understood from your mail, there is access to put the thermocouple means you can put more thermo wool to with stand the heat & start to monitor the temperature recorder, still it is coming down try to put more wool & dummy on both sides.

Regards,

E.Subramanian/Balaji.R

On Sun, Mar 25, 2012 at 12:04 AM, Harish Kannepalli <harishkannepalli@gmail.com> wrote:

Dear sandeep,

                 Please try putting coil inside the pipe also. As per code more than 60°C difference is not allowed.

2012/3/24 sandeep monody <smv.monody@gmail.com>

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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regards,

Harish.

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Regards,

E.Subramanian

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