RE: Stress Analysi on Design temp or Operating temperature

Glynn Woods teaches a B31.3 Course for ASME and so I asked him about the confusion between design and operating conditions and when each was used. His answer is summarized below:

For B31.3, the DESIGN pressure and temperature is used for:

1. component wall thickness sizing,
2. flange rating
3. relief valve set pressure
4. leak test pressure

and the OPERATING pressure and temperature is used for the flexibility analysis.

If you look at the Markl paper on Piping Flexibility Analysis, the operating temperature is more clearly defined. This paper is the basis of B31.3 flexibility analysis. ["Piping Flexibility Analysis," A.R.C. Markl, 1955 Transactions of the ASME].

Tony

From: Loren Brown [mailto:lbrown@coade.com] Sent: Tuesday, May 30, 2006 8:47 AM
To: Mohammad Danish; jcluf01@yahoo.com; shivku_2000@yahoo.com; <a href="/group/PipingDesign/post?postID=hFsOPMLkC8gspcWXUirjblUj4m5e6UrGWKg6Ddwe0mM45LTuLDqZ49q8MhTFUIDHNxKsx3K7qhyXWT7Xu4o">eliealtawil@yahoo.com</a>; <a href="/group/PipingDesign/post?postID=mgWjbme9ezok0C2SosdTXJHdAMxkUHhlWgcjuO9TmZNbNy-hMRIzFlFrpbLPCgBa2sQwM57EaA8">tony@paulin.com</a>; <a href="/group/PipingDesign/post?postID=aAY4EIUy2OO96JkjyQGu2bBa1eGZHRRxj2oxqgcjnLY5wswBwB9Nfm-DFiOlbfdL3GDFKUKAShQf4p5RSLcaY7Q6Fw">PipingDesign@yahoogroups.com</a> Subject: RE: Stress Analysi on Design temp or Operating temperature

I would definitely use the maximum operating temperature as this is what your piping system will see in the worst case.

Regards,

Loren A. Brown
Senior Engineer
COADE Engineering Physics, Inc.
12777 Jones Rd., Suite 480
Houston, TX 77070
(281) 890-4566
<a href="/group/PipingDesign/post?postID=OhqsTFB55phPf83V9ihLvfsNPCjYNCxj6w-inCLeONRLPnamwGV1N9_WBqt90hFsAp45nt1j">Lbrown@coade.com</a> <a href="http://www.coade.com">http://www.coade.com</a> <<a href="http://www.coade.com/">http://www.coade.com/</a>>

From: Mohammad Danish [mailto:mdanish@tebodin.co.om] Sent: Monday, May 29, 2006 3:44 AM
To: jcluf01@yahoo.com; shivku_2000@yahoo.com; eliealtawil@yahoo.com; <a href="/group/PipingDesign/post?postID=mgWjbme9ezok0C2SosdTXJHdAMxkUHhlWgcjuO9TmZNbNy-hMRIzFlFrpbLPCgBa2sQwM57EaA8">tony@paulin.com</a>; <a href="/group/PipingDesign/post?postID=aAY4EIUy2OO96JkjyQGu2bBa1eGZHRRxj2oxqgcjnLY5wswBwB9Nfm-DFiOlbfdL3GDFKUKAShQf4p5RSLcaY7Q6Fw">PipingDesign@yahoogroups.com</a> Cc: Loren Brown
Subject: Stress Analysi on Design temp or Operating temperature

Dear Friends,

Please advice me for doing stress analysis we should use design temperature or Maximum operating Temperature?

If we refer CAESER II, Then the help says that among the 9 Temperature fields the maximum operating temperature to be used.( Maximum operating temp appears to be the maximum)

Please advice.

Regards,

Tebodin & Partner LLC

Md Danish

Jr Pipeline Engineer

tel. +968-2449 6077

fax +968 2449 7290

gsm +968 95525965

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[Non-text portions of this message have been removed] Received on Wed May 31 09:24:00 2006