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Selva ydv
Active Contributor

Join Date: Mar 2010
Posts: 15

PWHT for Shell Nozzles in an API 650 Tanks

03/07/2011 7:52 AM

Dear All

Is pwht required for nozzles in an API 650 tanks referring to cl. 5.7.4.3[ as we are using 14mm thk shell plate A 516gr. 70 material]?

if required, can i go with local pwht?

If i do the Local pwht, what will happen in the tank. [we are constructing a new tank]

Pls. guide me, as we are planned to do the local pwht at site. Will it impcat the tank?. Is there any remedial action if any impact?

Does any one has the same experience?

Selva
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Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: PWHT for Shell Nozzles in an API 650 tanks

03/07/2011 8:18 AM

I would be very surprised if PWHT would be required for this, but I don't really know. Generally, PWHT "kicks in" for thicknesses around 1.500 inches (38 mm) or so, especially for vessels/tanks at high pressures, cold temperatures, or other such duties. Will this vessel/tank be subject to such conditions?

Our best CR4 authority for this would probably be Abdel Halim Galala. (I hope he doesn't tell us that I've screwed up....)

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
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MubashirAgha
Participant

Join Date: Jan 2014
Posts: 1
#2

Re: PWHT for Shell Nozzles in an API 650 Tanks

01/14/2014 2:16 AM

Did you perform PWHT locally or in furnace?

Actually I have a similar situation as yours need to know if I can do localized stress relieving or do I have to use the furnace the shell plate size is 12 m and by putting one nozzle on that shell it seems quite off to put the whole plate inside the furnace.

Can you give any guidance on this?
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