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 Mar 26, 1:13 pm, "E.S.Mani" <manie...@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 <
>
>
>
>
>
> harishkannepa...@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.mon...@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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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.
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