RE: AW: Limit stop in Piping stress analysis

The designer has to make a determination of the buckling force and the critical column buckling force separate from stress analysis (Caesar II at least). This is probably overlooked by many designers of jacketed piping in cases with straight piping spools with variation of material, temperatures, and pressures.

Ben

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=DLEumloy6ne_Cnk2tZE6bSAO_pOOlrkPUjVG6lHyEmkcuiXLflmYRh4uuQmd42elgqYFfIs_ldeN_V7GbSWa0A">trajyagu@ltcis.ltindia.com</a> [mailto:<a href="/group/PipingDesign/post?postID=DLEumloy6ne_Cnk2tZE6bSAO_pOOlrkPUjVG6lHyEmkcuiXLflmYRh4uuQmd42elgqYFfIs_ldeN_V7GbSWa0A">trajyagu@ltcis.ltindia.com</a>] Sent: Friday, April 19, 2002 7:41 AM
To: <a href="/group/PipingDesign/post?postID=Osnpmme-FCj8UJrsB3kI8P7hvpcIL_nRE90Gm_yDHFbI2leN-0XZ6a8dmTzcEmLWFDbwtVqzo5MZf3oEhA7pOX8z5ec">PipingDesign@yahoogroups.com</a> Subject: Re: AW: [PipingDesign] Limit stop in Piping stress analysis

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 Received on Fri Apr 19 19:15:00 2002