Water pressure at end of a outfall?
Water pressure at end of a outfall?
(OP)
I'm trying to determine the water pressure at the exiting end of a 66" storm water pipe. Max flow is 10 ft/s. Suggestions?
Thanks
Thanks
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Water pressure at end of a outfall?
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RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
Thanks
RE: Water pressure at end of a outfall?
A 66" pipe at 3m/sec sounds like a big force to me if it stops suddenly
SO it becomes a different calculation.
search force water jet screen and take your pick.
I would be more worried about the screen, especially if it's doing its job and actually screens something...
A screen at an outlet like that sounds like a pretty bad idea to me.
Do you have a sketch or a drawing to explain a bit more.
Remember - More details = better answers
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RE: Water pressure at end of a outfall?
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Water pressure at end of a outfall?
http://www.silt-barriers.com/floatingdebrisbarrier...
RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
Many examples such as this http://www.roymech.co.uk/Related/Fluids/Fluids_Jet...
I still would like to see how your end of the pie and screen is actually built as the website seems to be other things.
Also still seems like a bad move to me. Can you give a bit more explanation.
If you're really talking about a pipe end full of water at 3m/sec, don't be surprised if the force is really quite high.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pressure at end of a outfall?
Thaidavid
RE: Water pressure at end of a outfall?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
In order to calculate force on the screen, you need more information. What is the mean flow velocity in the reservoir at the exact position where the screen is located?
RE: Water pressure at end of a outfall?
Force = Mass per Second x Velocity Change
Assume the pipe is flowing full, calculate the mass flow (Slugs per second) and multiply by 10 fps. The answer is the maximum force for those conditions. The correct answer will be less force.
See this link: Link
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
But, rather than the 2440lbs. acting on a small area or length of the screen, immediately in front of the outfall pipe, isn’t the real design load 6 or 8" of water head behind the screen and over the full 50' length when the screen might start getting clogged up with floating junk? Why not ask the manufacture of that screen system what various load conditions should be considered? They’ve got far more experience with their screen system than any of us do. Why wouldn’t the loading on the screen system be based on some drag coef. and the flow of a given volume per second of water through the screen and some clogging debris being held back? Given floating debris, what are the wave action forces on the screen. If a 12" log might be transported through that 66" storm water pipe, I imagine it would be quite a concentrated projectile impinging on the screen, too close to the outfall. The screen should probably not be to close to the outfall. Maybe you should provide some sort of energy dissipating system at the outfall.
RE: Water pressure at end of a outfall?
Over the top?
Round the side?
Through the big hole in the middle when the screen fails? The linked material seems to be valid for a pretty gentle tidal flow to avoid getting debris in or containing debris from something like a floating log store. As the website says "You will want to periodically remove floating debris that has build up to prevent the structure from receiving too much pressure."
No where near enough information other than vague guesses all round.
It seems like a very strange idea to me all round....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pressure at end of a outfall?
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Water pressure at end of a outfall?
Anyway I got about 2 tonnes force on direct flat plate, so maybe not a huge force for "a 12" square precast prestressed concrete pile embedded 20 ft or so into the soil, and sticking out 13 feet or so above grade "
Sounds quite strong to me.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Water pressure at end of a outfall?
Depending on how much "sag" (mainly horizontal, but some vertical at low tide) there is in the cable holding the floating screen, the pull on the piling could be a good bit more than the two tonnes on a flat plate.
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Water pressure at end of a outfall?
RE: Water pressure at end of a outfall?
www.SlideRuleEra.net
www.VacuumTubeEra.net