I am analyzing 30” gas line . As per line list it is hydro tested.
As per project specification Bourdon effect need to be considered for line size 30” and above , hence I activated it.
I am getting quite high..around 3-4 tones friction loads in hydro case due to Bourdon effect.
Are these loads realistic? Should civil considers these loads in their design?

Just give the civil engineer these loads and specify their nature.

Dear sirs ,

Please allow me to continue this topic.
When I put a spring support under the equipment nozzle or a hanger which is located above the nozzle (please imagine both of springs and nozzles are aligned)and "Bourdon effect - Translation only" was activated , then I got a huge loads on the springs and nozzles during hydrostatic test.

I understand the report shows that the spring support/hanger was defined as "rigid" element during hydro condition ,and also the additional minor vertical displacements was generated due to pressure elongation. It would be like one straight pipe with two anchor ends during hydrotest ; thus ,the huge loads was coming.

However , the calculated result seems not in a real world , does anybody has the same case happened and how did you deal with this special case due to bourdon effect was activated ?

One question, how you had design the spring for equipment?

Regards,
R.K.

You are combining rigid vertical restraints with pressure extension of vertical pipe. I would not expect your model to show realistic loads here. I guess that there is enough "looseness" in those vertical supports to absorb those pressure extensions in vertical runs.
I suggest you set up a second model where those hard Y supports (that show high "Bourdon" load) are replaced with +Y's. I figure those large loads disappear with minor +Y deflection.

Hi Dave ,

Thanks for your reply ~