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getting huge Horizontal Reaction

 
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venkatesh
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PostPosted: Tue Sep 13, 2016 5:34 am    Post subject: getting huge Horizontal Reaction Reply with quote

Dear Sefians,
          This is reference to design of pipe line Carrying Bridge of 1 m Dia. It is showing  huge horizontal reaction Fx of 2000 kN-m and above. Even for DL alone it is about  300 kN of FX.
     Please Check the file  and your suggestions are appreciated.

Regards
Venkateshwar Rao



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VPandya
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Joined: 09 Nov 2009
Posts: 774
Location: Ahmedabad

PostPosted: Tue Sep 13, 2016 6:53 am    Post subject: Talk to Pipe Stress (Piping) People to reduced these Forces. Reply with quote

Dear  Er.  Venkateshwar  Rao,
I have worked on many Oil Refinery projects and  Design many PIPE-RACKS supporting  Pipes and  Cable Trays.  I got all my Major Loads/Forces  from PIPE STRESS ( Piping) group . A different Department then Structural Department.  They ( Pipe Stress or Piping  Group) do Pipe Stress  analysis  using (these days) software CAESAR II. There loads at Pipe Anchor Points and Pipe supports come out very High. The Lateral Loads/Forces  at Pipe-Stress analysis ANCHOR -POINTS     
are usually very High and impossible to design a reasonable Pipe-Rack for such High Lateral Loads. Pipe-Rack Fails in allowable lateral  deflections, usually H/100 . So me and my Boss ( Lead Structural Engineer) had meeting with Pipe-Stress Department.  Message from Pipe Stress/Piping  Department was we are not going to REDO our Pipe-Stress ( CAESAR II ) Analysis again.  So used the largest  Steel Sections in the Steel Tables ( Structural Cost is nothing in Oil Refinery Projects)  and design  for the forces we gave you.  In  oil refinery projects PIPE-STRESS (PIPING) Department run the show. We ( Structural Department ) are  just there to say  YES  SIR WE WILL DO as you order.  

A  very useful paper on Structural Design Of Pipe - Racks is attached.


Regards.


Vasudeo Pandya P.E.
Structural Engineer         


            



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Paper On Structural Design Of Pipe-Racks

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