Pipe Rack design 1

[B.L.Smith]

Dear Friends,

I have two questions:
1- Which load cases should be use for designing piperack structures and foundations?
Which one:
SUS(W+P1)?
HYD?
OCC(W+P1+T1+U or WIN)?

2- Is W+P1+T1+U an OPE load case or OCC load case?


Best Regards,
B.Smith

 

[C2it]

How nmany lines on your rack ?

Are all the lines stressed (and thus loads known ?)

Is there any chance of all the lines being hydrotested simultaneosly ?

In B31.3 and similar terms ....

W+P1+T1+U is one of an infinite range of possible OPERATING cases which render LOADS but not usually stresses.

W+P1+U would be a typical OCCasional loadcase in Caesar II terms, and would render OCCasional stresses for Code comparison.

 

[B.L.Smith]

Thank you Mr. C2it
There are 6 lines on the piperack: 20", 16", 16", 12", 10", 6"
Small bore lines are utility and large bore lines are H2S gas. and all lines modeled in the CAESAR.
But I don't know exactly how they will hydro-test. What is the difference?

 

[C2it]

Use the max from C2 operational and sustained cases. Consider wind shielding.

Beware of individual hydrotest loads from large gas filled lines.

It's very unlikely to run several hydrotests together, but I have seen it done for a main pipe rack, in order to minimise site disruption due to safety zones. Then the test weight was far in excess of any operating case and required temporary supports.