Dear All

How this fatigue analysis is performed for a U2 vessel. Is there any commonly used softwares? also is this analysis required for the whole vessel or only for nozzles/shell junctions.?

in my case
shell material - SA 516 Gr 70
pressure cycles - 100 cycles
Temperature cycles - 1500 cycles
Design life - 30 years


please help


Regards
vGsh

Hi wijeesh,
The fatigue analysis has to be performed for each point which is subject to operation cycles, not only nozzle/shell junctions. In general you start with the screening criteria given in 5.5.2 and it can happen that for some locations a fatigue analysis is required, others are exempted. The software for the calculation of the stresses is up to the designer. In my opinion it´s always a good advice to use a program which is also used by your partners to assure exchangeability of files and results. This normally leads to one of the major software providers we all know.

Michael

Dear Michael

Thanks for your reply

Vgsh

Dear All
Regarding fatigue analysis as per clause 5.5.2.3 (d),
"

What is the significance of this "changes in metal temperature difference between any two adjacent points"
Is it simply the temperature difference between two adjacent points / or difference in temperature difference between points???
If it is the second case, then there will be any temperature differences for points in same material???

Please help


Regards
vGsh