i have a pipe (external diameter 212.2mm, thickness 3.8mm) and
so:
Pipe radius R=(212.2-3.8-3.8)/2=102.3mm=10.23cm

Pressure: 1bar.

I modeled a spool 1000mm lenght, anchor at both sides.
Material A106B, B31.3

Load case: only "P1" OPE because i want to read only force due to pressure.

By hand calculus:
P=F/S so i want calculate F=P*S

P= pressure inside pipe= 1bar=10N/cm2
S= area inside pipe = pi*R^2 = 3.14*(10.23)^2 = 328cm2

so i should have a force on both pipe sides (on both anchors) equal to:
F=P*S=3280N

BUT...
if i make this calculs by caesar i obtain on anchors 1368N only.

Where is the mistake? why caesar does't give me the real force due to pressure on anchors?

maybe i am too tired to see an incredible mistake in my hand calculus?

thank you

Have you activated Bourdon Effect ("translation only") from Environment / Special Execution menu?

In my opinion, this option MUST ALWAYS be activated foe anr pressurized pipe.

Regards,

yes, already active. i still don't understand why i don't obtain tghe right pressure-force on anchors at pipe sides....

Please consider that you are not in the situation when an expansion joint is between two anchors.
If you do not use Bourdon effect you will have 0 force on the anchors. If you activate Bourdon you will have some but not full thrust. The pipe has not a discontinuity, so will tend to contain the pressure.

Regards,

The force you calculated is based on the internal area of the pipe; wouldn't this require the pipe to be capped & anchored at both ends to be accurate? In real life the pipe doesn't know the anchor is there to exert pressure on that internal face. I don't think an anchor attached to the outside of your pipe would see force of the same magnitude.

I don't think Bourdon is necessary for all pressurized pipe, unless you believe you have elongation/ovalization or particularly high pressure.

I think in your case anchor load should be less than P*S
I found this explanation http://www.whatispiping.com/restrained-and-unrestrained1

thank you