Ambient Temp.

Min. Winter temp. -3 deg c
Max. Summer temp. +50 deg c
Ope. temp. +40 deg c
design temp. +100 deg c

I have considered ambient temp. as -3 deg c, ope. temp 40 deg c and design temp 100 deg c in CAESAR II instead of default 21.1111 deg c. My senior asks me to take ambient as 21.1111 deg c as default, ope. temp 40 deg c and design temp. 100 deg c to do the analysis. Kindly advice me what temp. should i consider at Caesar II special execution parameter under ambient temp.

You can do your way or you can do as follows:

ambient 21.1111 C
+

L1=W+P1+T1 (OPE) - T1=40
L2=W+P1+T2 (OPE) - T2=100
L3=W+P1+T3 (OPE) - T3=-3
L4=W+P1 (SUS)
L5=L1-L4 (EXP)
L6=L2-L4 (EXP)
L7=L3-L4 (EXP)
L8=L2-L3 (EXP)

In addition search the forum for more informaton regarding the ambient temperature.

Regards,

Thanks Dan...

There is an equipment nozzle which fails in operating load case: L when ambient is considered as -3 deg c (-3 deg c [ambient] to 100 deg c [design]) but nozzle passes when ambient is considered as 21.1111 deg c (21.1111 deg c [ambient] to 100 deg c [design]). Kindly advice.

I will check the system restraint summary for nozzle loads based on the load case described by you.

While the second option is more realistic, you should follow what is written in the Stress Specification. If is written that -3 should be used as installation temperature, better that you follow the specification and try to make the layout more flexible.

Regards,

Design basis stats the analysis should be carried out with minimum ambient to maximum design temp. and company standard also specifies the same. So it is good to provide additional flexibility to reduce the nozzle loads instead of considering ambient as 21.1111 deg c. Isn't it Mr. Dan ?

It is not clear yet. Both ways are valid regarding the stress range(analysis should be carried out with minimum ambient to maximum design temp). Unless if is clearly stated that 21.1111 or -3 is to be considered as installation temperature you have the freedom to choose. The second is less conservative regarding the nozzle loads at 100 degrees.

Regards,