Deflection in double contained pipe - PFAxPVC

[Pipeline1972]

Hello all,
I need to calculate the deflection in a PFA pipe with double containment in PVC. I also need the stress on the PVC containment, assuming zero stresses on the PFA tubing.

I can calculate the deflection of one pipe, based on single span beam, but, since we're dealing with "double" piping, how does one affect the other? Can I just calculate the deflection in both pipes, and use whatever is the largest? Could it be that easy?

According to Nayyar's Piping Handbook, I can use the same beam deflection equations used for metal piping.

Process - Piping
ing - EiT

 

[Pipeline1972]

By the way, how does one calculate the deflection in a full pipe? In the formula for deflection, 5.W.L^4/(384.E.I), what's E, what's I?

In this case PFA tubing containing 96% H2SO4.

Process - Piping
ing - EiT

 

[Pipeline1972]

Never mind, it was easier than I thought at first. Anyway I can delete this thread?

Process - Piping
ing - EiT

 

[MikeHalloran]

Red flag your message and ask that the thread be deleted.


Mike Halloran
Pembroke Pines, FL, USA

 

[BigInch]

In the meantime, don't let the big pipe deflect more than the little pipe.

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