Dear All

Recently I have got a project in which I am supposed to do Stress Analysis for Cryogenic lines (Temp : "-ve"160 deg C.

Please let me known if I need to do any other activity which I never do in Hot line analysis.

If anyone have any stress report of cryogenic lines it would be great help to me.

Thanks in Advance.

Nit

As far as I know basically the major difference is that the line will be in contraction rather than expansion..The same type of evaluation as Sustained Stress, Expansion/Contraction Stress, Occasional Stress will be performed as per B31.3 if this is the Code shown in the Spec. If this is an LNG line then ask the process if the line will be subjected to Surge, then you will have to do some dynamic analysis using time history in Caesar II to get anchor loads at axial stops and check Occasional stress due to fluid hammer or surge..Another major difference will be the type of supports used which will be cold supports...Another thing to consider if this is an LNG line is the thermal bowing, confirm this value to process or check your stress spec if this is given..This can be easily inputted in Caesar II "Special Execution Parameters" as delta T and will automatically be added to the thermal loads or Contraction Stress..I'm also new to Cryogenic analysis, just the got the idea from my colleague who has experience on this..Any additional input is appreciated...

Cheers,

You will also have to address possible brittle fracture. It's in the Code.