This question is for COADE/Intergraph and advanced Caesar users.

Please suggest how to determine the occasional loads (wind) for a system with non-linear restraints (hangers) that has two design temperatures. Here is a hypothetical situation.

Cold Design T1= -46degC
Hot Design T2= +150degC
Installation temp +5degC

Caesar requires to isolate the occasional load by subtracting (OPE) from (OPE+OCC) to use in the code load case summation SUS+OCC. So if we have the following operating cases:
(OPE)L1=W+T1+P1+H (for cold design)
(OPE)L2=W+T2+P1+H (for hot design)
and the code sustained case
(SUS)L3=W+P1
then would it be enough to establish the occasional load due to wind for just one of them and use it in the SUS+OCC load case or would it be necessary to establish the corresponding OCC load for each temperature, T1 and T2 and then consider two SUS+OCC cases?

So, here is option 1:
(OPE)L4=W+T1+P1+H+WIN1 (T1 is for cold design)
(OCC)L5=L4-L1 (this is the isolated OCC load for non-linearity)
(OCC)L6=L3+L5 (this is the code case SUS+OCC)

or option 2:
(OPE)L4=W+T1+P1+H+WIN1 (T1 is for the cold design)
(OPE)L5=W+T2+P1+H+WIN1 (T2 is for the hot design)
(OCC)L6=L4-L1 (isolated OCC load for non-linearity for T1)
(OCC)L7=L5-L2 (isolated OCC load for non-linearity for T1)
(OCC)L8=L3+L6 (SUS plus OCC for T1)
(OCC)L9=L3+L7 (SUS plus OCC for T2)

The real question is will the calculated OCC load change depending on the design temp? I don't have access to Caesar at the moment, so I cannot check.

Your expert advice will be greatly appreciated.
Thanks

If it's windy for T1 AND for T2 I would use option 2 unless I could determine which OCC was worse.

Dave,
Thanks for the prompt answer. The design wind pressure is the same for both temps. My question comes more from the temperature perspective. A piping system in cold and hot conditions will behave differently – the pipe contraction and expansion will cause the hangers to either compress or extend as well as to close the support gaps in different directions. This will affect the way the non-linear supports will behave (the distance to travel and the required effort). So will the OCC component calculated for the expanded hot pipe be the same as for the contracted cold pipe? In other words, in option 2 below, will the loads L6 and L7 be the same for all nodes, including those corresponding to the supports with closed gaps and compressed/expanded hangers?

or option 2:
(OPE)L4=W+T1+P1+H+WIN1 (T1 is for the cold design)
(OPE)L5=W+T2+P1+H+WIN1 (T2 is for the hot design)
(OCC)L6=L4-L1 (isolated OCC load for non-linearity for T1)
(OCC)L7=L5-L2 (isolated OCC load for non-linearity for T1)
(OCC)L8=L3+L6 (SUS plus OCC for T1)
(OCC)L9=L3+L7 (SUS plus OCC for T2)

Thanks in advance for your input

The fact is that the restraint conditions for L1 and L2 could be different, so you should check both of them by using your option 2. The results for L6 and L7 are not necessarily the same.

Loren,
This is exactly the answer I was looking for. Thanks a million!