Dear Mr. Parveen K. Nakwal
If construction code is ASME refer Sec. VIII Div. 1 UCS 56
Above 800°F (425°C), the rate of heating shall
be not more than 400°F/hr (222°C/ h) divided by the maximum
metal thickness of the shell or head plate in inches,
but in no case more than 400°F/hr (222°C/h).
Above 800°F (425°C), cooling shall be done in
a closed furnace or cooling chamber at a rate3 not greater
than 500°F/hr (280°C/h) divided by the maximum metal
thickness of the shell or head plate in inches, but in no
case more than 500°F/hr (280°C/h).
Note : The rates of heating and cooling need not be less than 100°F/hr
(56°C/h). However, in all cases consideration of closed chambers and
complex structures may indicate reduced rates of heating and cooling to
avoid structural damage due to excessive thermal gradients.
With Best Regards
Parveen Kumar Nakwal ---13/06/2012 16:49:25---Dear Experts. What is the tolerance limit of Rate of heating and cooling in PWHT process
From: Parveen Kumar Nakwal <firstname.lastname@example.org>
Date: 13/06/2012 16:49
Subject: [MW:14530] Tolerance of Rate of heating & cooling
Sent by: email@example.com
What is the tolerance limit of Rate of heating and cooling in PWHT process ? Please mention Section & Clause no.
Waiting for reply.
Parveen K. Nakwal
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