#23539 - 01/05/09 04:12 PM
Pipe Supports On Pipe rack...
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Member
Registered: 11/10/08
Posts: 12
Loc: Port-Harcourt, Nigeria
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Good day all, Please I would like to know If its a good design practice to have REST SUPPORTS(+Y) on ALL alignments for large bore (e.g 68") pipes on the pipe rack?. I am more concerned about the technical(workability)aspect of the system. (flexibility,rigidity,load distribution etc ) Thank you for your anticipated response.
Edited by caesarian (01/05/09 04:13 PM)
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#23542 - 01/05/09 06:16 PM
Re: Pipe Supports On Pipe rack...
[Re: caesarian]
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Member
Registered: 06/23/07
Posts: 285
Loc: Manila, Philippines
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IMO it is okay but you should consider occasional events(earthquake, wind, etc.). also check your local stress you will need pads.
Regards!
_________________________
BOM
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#23547 - 01/06/09 03:18 AM
Re: Pipe Supports On Pipe rack...
[Re: bom]
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Member
Registered: 11/22/06
Posts: 1195
Loc: Hants, UK
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Not sure quite what you are asking here, but if you are suggesting supporting a 68" line on ALL bents of a pipe rack, the answer is ... look at the allowable span first and do check local stresses. You don't want a support every 6m on a 68" line, more like every 18m.
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#23549 - 01/06/09 03:39 AM
Re: Pipe Supports On Pipe rack...
[Re: bom]
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Member
Registered: 04/09/04
Posts: 27
Loc:
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Hi caesarian,
In my opinion, the answer to your question depends mainly on the design of that piperack.The best thing to do would be to talk to your civil engineer who is in charge of designing the piperack especially when dealing with such huge loads. I hope my answer is helpful to you.
_________________________
PIPING STRESS ANALYST
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#23573 - 01/06/09 03:40 PM
Re: Pipe Supports On Pipe rack...
[Re: S]
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Member
Registered: 10/24/00
Posts: 334
Loc: Houston, Texas, USA
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Vapor or Liquid? In a 68" line, that's the difference between about 360 lbs/running foot and 1900 lbs/running foot!
_________________________
Edward L. Klein Pipe Stress Engineer
All the world is a Spring
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#23839 - 01/14/09 09:51 PM
Re: Pipe Supports On Pipe rack...
[Re: Edward Klein]
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Member
Registered: 01/14/09
Posts: 38
Loc: china shanghai
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but,there is important question,how to simulate the support?
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#23930 - 01/19/09 02:45 PM
Re: Pipe Supports On Pipe rack...
[Re: zzw]
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Member
Registered: 10/24/00
Posts: 334
Loc: Houston, Texas, USA
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Well, with lines that large, you don't want to neglect the movement due to radial expansion. I would model a rigid element from the centerline of the pipe, down to the OD and put your Y support there.
That will get you your globals loads and stresses. But, as was noted, you are likely going to need some kind of FEA to check the local stresses. A Pad may not be sufficient. You may need a full blown saddle, even if you have no insulation. Details....details....details! Don't forget 'em.
_________________________
Edward L. Klein Pipe Stress Engineer
All the world is a Spring
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#23951 - 01/20/09 08:33 AM
Re: Pipe Supports On Pipe rack...
[Re: Edward Klein]
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Member
Registered: 11/28/01
Posts: 25
Loc: Bogota
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Talk to your civil, and agree a criteria. A possibility is to calculate the weight for a 18 meters span and place that load in the civil calcs every 12 or 6 meters, that is because you don’t know precisely how is going to be the distribution of loads. This criteria would be conservative.
_________________________
Santiago Naranjo
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#23995 - 01/21/09 12:14 PM
Re: Pipe Supports On Pipe rack...
[Re: Santiago Naranjo]
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Member
Registered: 12/15/99
Posts: 120
Loc: Houston, Texas U.S.A.
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Since you asked about rigidity and load distrubtion.....
My recommendation is to consider the stiffness of all of your support beams if they are not all the same.
My experience with large heavy lines and smaller support members is that the pipe will deflect as it pleases and the beam will deflect with it while the stiffer supports beams will carry the bulk of the loads.
The support contribution the smaller beam members will provide will be the pipe deflection times the support spring constant at the support point.
Good luck,
_________________________
NozzleTwister
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#24002 - 01/21/09 02:05 PM
Re: Pipe Supports On Pipe rack...
[Re: NozzleTwister]
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Member
Registered: 04/12/04
Posts: 493
Loc: London, UK
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Also check for high local stresses at support locations.Formulas are available in Roarks.
_________________________
anindya
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