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DSB123, you are actually right. I was thinking to connect the two vertical lines with a "C modeled" leg, (likely an expansion loop) with vertical lines in the C tip and the valve in the middle. Now my biggest issue is to determine boundry conditions.

Stressguy, Your first suggestion has correctly described the situation and your post is really interesting. I think flexibility is not place in risk, in fact the line has a lot of change of direction( crosses the rack many times, change elevation....). However i agree with you, hazardous...

Pan, the design temperature is 210°C (410°F), the operating temperature is 177°C (351°F). Maybe it will be necessary to arrange a support under new valves.

Nozzle, Stressguy, this is the existing situation: the line runs on a rack (elevation ~12 ft), then comes down to a control valve group, then rides up to the rack again. I have to add a valved bypass for the control valve and a block valve. There’s no guides, only supports. I think it’s only a...

Thank you pipeRus. I also think that, but the client doesn't want to "buy" a 200 ft stress analysis for adding two valves. I might elect some points like "end point calculation " and input their displacements. PierAndrea

Hello all, I've just started to work on stress analysis. I have to add 2 valves 12"-150# to an existing line (12" fluid:hydrocarbons)and calculate with B31.3 lines. Now, I have 2 problems: 1) This line is very long and has a lot of ramifications and the anchors are very far from interest zone...