As I am doing further work & study on jacketed piping, certain doubt came in my mind.
We are doing stress analysis of jacket piping using Caesar II as describe in manual . In addition to that we make manual calculation for buckling failure & core-jacket interface weld joint failure based on temperature differential between core pipe & jacket pipe.
Question is do we really required to do that additional calculation ?
Jacket pipe will experience jacket fluid temperature no doubt. Now core pipe if I consider will experience core fluid temperature I feel we are in highly conservative approach. Because core pipe internal face have core temperature & external face have jacket temperature . Expansion of core pipe will be as per highest temperature i.e. jacket fluid temperature if I ignore minor error. So there should not be any temperature differential between core & jacket pipe at least no significant difference.
So I feel even if I don’t do any addition calculation for jacket piping there should not be any technical issue.
Generally there are no much difference in temperature between core & jacket line temperature also so conservative calculation has not seriously effect on stress analysis.
I seek expert opinion on this issue please.