Dear Friends,

I read many threads here & also the ASME papar for Friction treatment, i found some queries among all of these. I hope I can get clear my doubts.

I have Two queries as below.

Problem : My system have design temp = 50 Degree C & Opera Temp = -22 Degree C. Ambient Temp as per Project code = 36 Degree C.

I have to issue Pipe Rack Load Data.
I did the analaysis with Mu=0.3, take out Restarint Output & after that I changed the Friction Multiplier as = 0.0 in Static Load Case.Hence, considering Friction Factor =0 throught the system.

I compared both restraint summary,as per Technical Paper & thread's discussion, Without Friction Factor is conservative. But i found that with friction factor Forces/ Moments are very high. Even some cases without friction factor loads are high,some nodes have the same values & some nodes are have less value than with friction system.

Although my design temp & ope temp are nearer to ambient temp,expansion effect is not so much. But I still feel that for Pipe Rack load data, With friction Factor is the best methodology instead of without friction factor.

Since, the frition factor plays a key role for forces / moments, i am not able to understand why some nodes have less loads than without friction factor file.

Problem 2)One of my system connected from Pump to Tank via Pipe Rack. I would like to know the load case for Tank settlement. I did analysis as below. Please review the load cases if i m right or wrong.

l1 = W+P1+T1+D1+D3+H (OPE- D1= PUMP)
l2= W+P2+T2+D2+D3+H (OPE- D2=PUMP)
l3= W+P1+H (SUS)
l4 = W+P1+D3+H (D3= SETTLEMENT TANK)(SUS)
l5 = L1-L3 (EXP)
l6= L2-L3 (EXP)
l7 =L1-L2(EXP) (THIS IS FOR TEMP DIFF)

I followed as per above load cases.

For Case - 4 what will be allowable?
Are Nozzle Load check against the load case L4?

I hope ur guidance will sort out my quries.