PWHT as per UW-2 v/s stress relieving as per UCS-79(d)

hitesh_a_s · **Joined:** Sun Jan 25, 2009 4:57 pm **Posts:** 3

There is a pressure vessel for which PWHT is mandatory as a service requirement as per UW-2.
For the same vessel, head needs to be stress relieved as per UCS-79(d) because fiber elongation obtained in calculation of the head is more than 5%.
Under such a scenario is it necessary to separately perform stress relieving of the head when the complete vessel is to be post weld heat treated (Normalized) later on?

Regards,
Hitesh.

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

hitesh_a_s wrote:

There is a pressure vessel for which PWHT is mandatory as a service requirement as per UW-2.
For the same vessel, head needs to be stress relieved as per UCS-79(d) because fiber elongation obtained in calculation of the head is more than 5%.
Under such a scenario is it necessary to separately perform stress relieving of the head when the complete vessel is to be post weld heat treated (Normalized) later on?

Regards,
Hitesh.

NO.
Mauro

PWHT as per UW-2 v/s stress relieving as per UCS-79(d)

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