Dear Ashok,
Let's go back to basics..
stress is directly proportional to strain and
strain = change in length / original length..
Lets say if original length is 1 mt. and change in
length is 2 mm for a particular material at particular
temp. Then if the length is 2 mt. it will be 4 mm and
so on...so the strain is independent of the length.
And breaking the length will not achieve and
distribution of load on the straight run. Rather the
case will be if you are putting one sided constraints
then only one of them will work and if you are putting
two sided constraints then each constraint will be
over-stressed (of course depending on the
temperature).
So it is advisable to put only one axial constraint in
a straight run and it's location on the straight run
will govern the expansion transfer which is to be
absorbed in the adjacent legs.
I hope this will help.
Best Regards,
Mukesh Chugh
<tt>
Man,<BR>
<BR>
What are you upto. Any way, just to remind you that
the golden rule in<BR>
piping analysis is to provide only one limit stop (or
axial stop) in a<BR>
straight pipe run unless you have an expansion loop in
between. In your<BR>
analysis please check if the line is balanced in
expansion sress. In my<BR>
opinion the line is already overstressed.<BR>
<BR>
I am unable to understand your "distribution of
piping loads" concept. In<BR>
any case if the line is hot and there is a long
straight run, try using an<BR>
expansion loop with two limit stop at suitable
positions on either side.<BR>
<BR>
Regards,<BR>
Pankaj Mandal<BR>
Siemens Power Engineering Pvt.Ltd.<BR>
Plot 6A, Sector-18,<BR>
Maruti Industrial Area,<BR>
Gurgaon-122 015.<BR>
<BR>
ph:0091 124 6347990 Fax: 0091 124 6349050<BR>
Mail to Pankaj.Mandal@siemens.com<BR>
<BR>
<BR>
-----Ursprüngliche Nachricht-----<BR>
Von: Ashok Dani
[mailto:ashokdani@tatachem.tata.com]<BR>
Gesendet am: 19 April 2002 08:19<BR>
An: 'pipingdesign@yahoogroups.com'<BR>
Betreff: [PipingDesign] Limit stop in Piping stress
analysis<BR>
Wichtigkeit: Hoch<BR>
<BR>
In a straight pipe run how many limit stops we can
provide. <BR>
<BR>
I have designed test model wherein I have put three
limit(axial) stops(with<BR>
equal and unequal gaps) in straight run to distribute
load on three supports<BR>
but in operating case last axial stop is acting while
other two stops are<BR>
not acting during operating case. <BR>
What would be the reason for this phenomena?<BR>
Thanks<BR>
Hitesh<BR>
<BR>
<BR>
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