Hai everybody,
Can any body tell briefly about how to calculate the resulting force on a thrust block due to fluid velocity and pressure in a bend . is it true that caesar will not calculate thrust forces due to velocity.

Statically balanced (usually)assuming opposing bend
otherwise if pipe is open onded....

P=f/a ????

http://www.northernpipe.com/NPP_PVC_Home...ressure_pi.html

refer to this link.

regards,

sam

Your question is incomplete!!!! If your system is welded or continously connected piping the PXA load is carried internally by the pipe wall.

But if you have a push on joint then the thrust block reference is appropriate.. So expound on your question or thrust block everything, I'll be glad to fix it for a fee afterwards!

Although Superpiper will probably get the work!

Hello Mr.LUF ,
it is not a closed loop,but open to atm.what i found for it is,
The resulting force on a thrust block due to fluid velocity and pressure in a bend

can be expressed as
F = 2 A (ρv2/g + p) cos(θ/2) (1)
where
F = resulting force acting on the pipe bend (N, lb)
A = area of pipe (m2, ft2)
ρ = density of the fluid (kg/m3, lb/ft3)
v = velocity of the fluid (m/s, ft/s)
g = acceleration due to gravity (9.81 m/s2, 32.2 ft/s2)
p = pressure in pipe (kPa, lb/ft2)
θ = angle between pipes - bend angle
The angle the resulting force F makes upstream line of the bend can be expressed as
α = θ/2 (2)
where
α = angle the resulting force makes with the incoming pipe to the bend

Dear naveenleo,

For the open end I understand the presence of velocity term; but, otherwise with a slip joint of non-welded elbow, will we reqire a velocity term ? Please check.

regards,

sam

hello sam,
what u said is correct , there is no need of vel term with slip joints, but they are mostly avoided for the application were sealing is preffered.

I thought he was refering to a thrust block commonly found on the elbow of large relief discharge pipework, or loops.

Obviously completely wrong.

I'll just go an give myself a good beating....................