Velocities in pipes
Velocities in pipes
(OP)
Are there any problems with a velocity of 30 ft/s in ductile iron pipes for water at 70 degrees F.
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RE: Velocities in pipes
RE: Velocities in pipes
RE: Velocities in pipes
Corrosion (and cavitation) of the pipe will also be an issue and the life of the pipe will be reduced severely. Cavitation will further the already very high frictional losses and also make the pipe noisy.
flame
RE: Velocities in pipes
KRS Services
www.krs-services.com
RE: Velocities in pipes
Do you have a system that is flowing like this? Is it in design or existing? Please tell us more.....
BobPE
RE: Velocities in pipes
concrete outlet penstocks have been safely used at velocities up to 100 ft/sec but at higher velocities it is normal to line with stainless steel.
With ductile iron pipe the bell and spigot joints estrict maximum velocity to about 40 fps.
As pointed out in the other replies there are many assocaited problems with high velocity flow. If you try to control the flow at these high velocities then you will generate high surge pressures.
Brian
RE: Velocities in pipes
Last time I did the calcs, cavitation occurs in clean water at about 23 to 30 fps. Pressures experienced in ductile iron pipe have little or nothing to do with limiting cavitation.
I am really interested in if you have an example of a penstock flowing at 100 fps. There are nozzle outlets that flow like that, but I never seen anyone crazy enough to put something like that in concrete through a high investment dam.
Again there are some good discussions posted in other areas that discuss this in detail.
BobPE
RE: Velocities in pipes