API 650 2007 Appendix P.3 1

[svi]

Ref:

http://www.eng-tips.com/viewthread.cfm?qid=75687

Appendix P.1 Introduction says that the appendix presents 2 different procedures for determination of external nozzle loads on tank nozzles. P.2 establishes limit loads and P.3 based on allowable stresses. However it says at the section P.3 that it is deleted in it's entirety. Why is this so?

 

[IFRs]

It was found to have errors and needed a complete review and revamp.

 

[svi]

Thanks IFR.

I wonder why don't the codes give a bit of this explanation of the purpose it is intended.

Here is a similar one on ASME B31.3 interpretations.

http://tech.groups.yahoo.com/group/PipingDesign/message/20112

 

[JStephen]

I just got an email that a new addendum is out on API-650, but haven't had a chance to download and review yet.

 

[IFRs]

Sajit - the Yahoo link did not work for me - needs a login. API might have issued a notification, I don't remember (good idea, though). The new addendum does not have P.3

 

[Gator]

Here's the text of the post:

Re: [PipingDesign] Re: Design Life and Flexibility temperature

Chris,

I agree that the steam out temperature should be used to asses the thermal
expansion.

ASME B31.3 - 2004 Interpretation 19-40

"Question: In accordance with ASME 831.3-2002, does the phrase "maximum
metal temperature...for the thermal cycle under analysis" in para.
319.3.1(a) require the use of the design temperature (defined in accordance
with para. 301.3) in "determining total displacement strains for computing
the stress range" SE?

Reply: No."

If it is only to say that the 2 aren't synonymous, the above is misleading.

John Luff, your comment is requested.

In this case, where the steam out condition does not form the design
condition (condition resulting in the max component thickness at the
pressure at the coincident temperature), this is true as well.

Bare CS lines exposed to the sun is assumed to reach a temperature of 85 deg
C, in this region. This I suppose is an overtly conservative assumption of a
black body radiation absorption and the resulting rise in it's temperature.
For this to happen the pipe has to be painted black and the contents on the
pipe has to be 'not flowing'.

I tried to find any links on this. could only get this,

http://www.engineeringtoolbox.com/radiation-heat-transfer-d_431.html

http://www.pipingdesigners.com/Training - Section 4.htm

In many an instance a piping system has to be made flexible for the 85 deg C
thermal growth.

Sajit

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