Hi all,
I need to perform a stress analysis of a fired heater that operates cyclically with the following cycle:
Other informations available:
-Piping Temperature distribution for each moment of the cycle;
-Min Ambient temperature/Ambient temperature: -43°C/25°C;
-Design temperature;
-Design and operating pressure;
-Operating cycles: 15000;
-No pressure fluctuations are foreseen.
After finalazing the model I've set the following load cases:
L1 WW+HP HYD
L2 W+T1+P1 OPE
L3 W+T2+P2 OPE
L4 W+P1 SUS
L5 W+P2 SUS
L6 L2-L4 EXP
L7 L3-L5 EXP
where T1,P1 design temperature and pressure, T2,P2 temperature and pressure in a specific moment of the cycle (operating).
My question is:
Wich kind of load cases for fatigue should I set for this cycle?
I hope it's clear.
TY.