Hi,
I did the flexibility analysis for 16" CS pipe (Fire water, Operating 16 bar, 50 degC) which is connected to the Pump Nozzle. In the result, Piping Load on the Pump nozzle is exceeding the Pump allowable.
Now we go for the Simple Bellows (Rubber Expansion joint) near to the pump nozzle to resolve this.

From the REJs vendor, we got the below information
Axial compression (25 mm),
Lateral deflection (15 mm),
Torsional stifness (5 deg)
REJ Vendor doesnt have stiffness values.

In the Caesar, stiffness value needs to be given as input.
I dont know how to calculate this data and to proceed the analysis.

Kindly help me out in this regard.


Thanks,
Kannapiran.K

The stiffness of a rubber EJ is usually not significant in an average piping system. If you cannot get better data from the manufacturer, I would advise use 10 N/mm, 10 N.mm/deg (or similar depending what units you are using), and carefully monitor the relative movements of your EJ to judge acceptability.

Daer Kannapiran

Simple(untied) bellow will not work. You must use
1)Tied expansion bellow in discharge line
2)Untied bellow may work in suction line but prefer to have a tied bellow.

Regards

Habib

Consider the effect of pressure thrust if going for untied bellow

Regards,
Shamalia Bhavin