Dear Sandeep,
If you are doing PWHT for Sec VIII Div 1 requirements then refer UCS 56 (d) (3)
(3) The vessel or vessel part shall be held at or above
the temperature specified in Table UCS-56 or Table UCS-
56.1 for the period of time specified in the Tables. During
the holding period, there shall not be a greater difference
than 150°F (83°C) between the highest and lowest temperature
throughout the portion of the vessel being heated,
except where the range is further limited in Table UCS-56.
Cheers
MM
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Harish Kannepalli
Sent: Monday, March 26, 2012 6:43 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13995] PWHT OF P91 BY INDUCTION HEATING
Dear sandeep,
Please refer ASME Section VIII Div.1 UCS-56.
2012/3/26 E.S.Mani <maniesbk@gmail.com>
Dear Harish,
Can you please tell me which code is accepting the 60°C difference & where.
Regards,
E.Subramanian.
On Mon, Mar 26, 2012 at 4:13 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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Regards,
E.Subramanian
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regards,
Harish.
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