I think the discussion has become quite interesting. pankaj mentioned that
the system should be overstressed in expansion case, Agreed, there will be
high axial stresses in straight line with more than one limit stop. But if
you see the equation of expansion stress as per B 31.3, you will find that
it takes only bending and torsioal stresses in calculations and not the
axial stresses. If you model a straight line with anchors at both ends and
temperature around 500, code stress (expansion stress) will be zero, but
actually due to high axial stresses, it is going to fail. The problem is
neither code considers axial stresses nor it takes buckling effects into
account.
Can anyone throw more light on this ?
Mandal Pankaj <Pankaj.Mandal@siemens.com> on 04/19/2002 08:03:56 AM
Please respond to PipingDesign@yahoogroups.com
To: "'PipingDesign@yahoogroups.com'" <PipingDesign@yahoogroups.com> cc: (bcc: TUSHAR K RAJYAGURU/L&T-CHIYODA) Subject: AW: [PipingDesign] Limit stop in Piping stress analysis
Man,
What are you upto. Any way, just to remind you that the golden rule in piping analysis is to provide only one limit stop (or axial stop) in a straight pipe run unless you have an expansion loop in between. In your analysis please check if the line is balanced in expansion sress. In my opinion the line is already overstressed.
I am unable to understand your "distribution of piping loads" concept. In any case if the line is hot and there is a long straight run, try using an expansion loop with two limit stop at suitable positions on either side.
Regards,
Pankaj Mandal
Siemens Power Engineering Pvt.Ltd.
Plot 6A, Sector-18,
Maruti Industrial Area,
Gurgaon-122 015.
ph:0091 124 6347990 Fax: 0091 124 6349050 Mail to Pankaj.Mandal@siemens.com
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Von: Ashok Dani [mailto:ashokdani@tatachem.tata.com]
Gesendet am: 19 April 2002 08:19
An: 'pipingdesign@yahoogroups.com'
Betreff: [PipingDesign] Limit stop in Piping stress analysis
Wichtigkeit: Hoch
In a straight pipe run how many limit stops we can provide.
I have designed test model wherein I have put three limit(axial) stops(with
equal and unequal gaps) in straight run to distribute load on three
supports
but in operating case last axial stop is acting while other two stops are
not acting during operating case.
What would be the reason for this phenomena?
Thanks
Hitesh
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[Non-text portions of this message have been removed] Received on Fri Apr 19 07:40:00 2002
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