Good morning dear friends,
I am doing stress analysis for power B 31.1.
when I check the displacements in operating condition then my displacements are coming as follows:
DX:-126.768mm
DY:104.47mm
DZ:-119.914mm
Shall I need to reduce these displacements more or its ok?
How is the maximum displcements limit?

Thank you all.

Regards.

sorry how much is the maximum displacements limit?

Mate,

As such there are no defined max limits!!

Some examples:
For sag (Y disp in sustained) : defined by allowable support span as in your project spec. (normally 5 mm for gas/steam lines & 10 mm for others)

For lift-off (Y disp in thermal) : defined by allowable lift-off in your project (normally 2 mm).

Axial thermal disp: Depends on your project std & length of shoe..Also, the line shouldn't interfere with nearby equipment,structure , line or any other obstruction while in operation (normally 150 mm in ISBL & 350 mm for pipe racks).

Lateral thermal disp: Depends on your project std .Also, the line shouldn't interfere with nearby equipment,structure , line or any other obstruction while in operation


Strict word of Caution: These values are not binding & varies from project to project & company to company. These are just illustrated as examples.

Thank you very much SJ. Your response helped me a lot.

Thank you.

Regards.

Peterson, why you have these displacements.
Has your pipe a small diameter? If so, try considering to add some guide.
As SJ wrote, check interferences.
In your system is Y the vertical directions? If so you could check if you have a lift off in a +Y supports.

Corrado Vannella