Regarding the use of CaesarII to determine whether a pipeline is in a low-temperature and low-stress condition
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This post was last edited by lp3484 on 2021-10-22 at 10:43. The new versions of GB20801.2-2020 specify clauses 3.1 and 3.2 regarding low-temperature and low-stress conditions as well as low-temperature stress-reduction conditions; item b of these clauses requires verification of the axial tensile stresses caused by pressure, gravity, and displacement. I’m curious to know how others approach this. In CaesarII, for the SUS condition, it’s gravity and internal pressure loads, while for the EXP condition it’s thermal displacement loads. I wonder whether it would be sufficient to add up the axial stresses calculated under these two conditions, or whether it would be possible to define a new condition called SUS+EXP. Or perhaps two additional operating conditions should be defined separately, with only pressure P and gravity W in those cases; then the axial stress substitution values in those conditions would need to be determined. Please advise, experts
Don’t you want to learn about OPE operating conditions?
Is the OPE operating condition sufficient? I’ve never understood that under OPE operating conditions, if some supports become unsupported, the axial stress resulting from gravity must differ from that in the cold state; the specifications don’t clarify this either. I’ve read many papers, and it seems that most of the hand-calculated formulas involve performing calculations separately for the cold state and then adding those results together