Re: [MW:14854] Heating/cooling rate requirement for PWHT

Aakar,

Is there any ASME interpretation to clarify on this non-mandatory requirement.You know,our custom ask us to provide documentary proof to prove our explanation right. 

Regards,

Devin

在 2012年7月12日星期四UTC+8下午2时27分43秒，aakar写道：

Yes it is not mandatory,it is very clearly stated that need not to less than 56 c/hr without any structural damages

-original message-
Subject: [MW:14846] Heating/cooling rate requirement for PWHT
From: Devin <yanfeixiu@gmail.com>
Date: 12-07-2012 8:39 am



Dear All,

As per ASME section Ⅲ NX-4623,Above 800°F(425℃) the rate of heating and
cooling in any hourly interval shall not exceed 400°F(222℃)divided by the
maximum thickness in inches of the material being heat treated,but shall
not exceed 400°F(222℃)and *need not to be less than 100**°F(56**℃)in an
hourly interval.*

 

Now the actual heating and cooling rate in our production we made is 50℃/hour
which is less than 56℃/hour required above. Our custom insist that this is
unacceptable and should be reheated. But my understanding is that the *56**℃is not a mandatory requirement
*and only the upper limitation is required. Do I understand this correctly?
PLZ guide me! Appreciate it！

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