I have many lines that using the rubber expansion joint. The purpose is to absorb the vibration from the equipment.

Is it neccessary for line using rubber bellow need to run caesar?

Line condition as follow:

Diameter = 6 inch, 4 inch
Max temperature = 70 degree c
Max pressure = 2 barg
Fliuid = water

Thanks for your valuable help.

Probably yes since are on lines connected to rotating equipments.

But read your Piping Stress Specification. Should be written in there.

Regards,

Thank Danb for prompt reply.

But it's not rotating equipment, just unloading equipment. And no any written in pipe stress spec.

How should I decide?

If:
- you have tied bellows;
- equipment do not have low allowable nozzle loads;
- you have enough experience in supporting lines;

you do not have to worry about.

If you have untied belows, make sure equipment vendor know that you are going to transfer pressure thrust on the equipment, place an anchor on the other side of the bellow.

If you are not sure on the results, perform a calculation at least on the most critical one.

Regards,

http://www.bssindustrial.co.uk/uploads/docs/304.pdf

the interesting thing about this vendor is that clearly specify on each type of bellows:

"These bellows require suitable anchors".

or

"These bellows do not require anchors."


Regards,