Re: Steam Out

From: <Mchugh@technip.com>
Date: Fri Jul 09 2004 - 10:00:00 EDT

Dear Tushar,

Reply to your Question A)

In general during "Steam Out/Steam Blowing" we don't include equipment, so the question of checking nozzle loads does not arise. But if the process requirement demands inclusion of any equipment in the Steam Out process then we have to check the nozzle load also. So that's how I analyze such cases.

Question B)

Your statement "Please note that exp stress is higher than the code allowable stress from Table A-1." is not very clear. Can you please elaborate it.

Regards,
Mukesh Chugh,
Principal Engineer - Piping,
Technip KT India Ltd.

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| | 06/25/2004 07:49|
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   | Subject: [PipingDesign] Steam Out
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I would like to seek experts opinion on the "Steam Out" case analysis of piping.

Question A)
I have came across 2 different practices......... 1) some companies have practice of just checking the pipe stress and do not check the nozzle loads
2) some companies do both

What is your preference 1) or 2)??? Why?

Question B)
What shall be the allowable stress in case of steam out? B31.3 says, it can be taken 33% higher.
Shall it be
1) 33% higher than the expansion stress at that temp or 2) 33% higher than the code stress at that temp.? Please note that exp stress is higher than the code allowable stress from Table A-1.

What is your preference 1) or 2)? Why?

Best Regards.

Tushar Zope
Extn: 162

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