Pressure release for sediment jetting system
Pressure release for sediment jetting system
(OP)
Hello Y'all!
I am working on a retrofit of a water jetting system which consists of a 30 HP pump pumping water through a 6" PVC pipe which is sealed at the other end, but has 1/8" holes spaced 6" apart. The purpose of the system is to "jet out" water from the 1/8" holes to keep sediment from settling in a river intake.
The system failed in operation in the past because in the non-pumping season, the 1/8" holes fill with biologic growth and debris, thus causing undue pressure in the system and tripping of the pump.
The idea is to install a "pressure valve" or "relief valve" which would allow the egress of excess pressure. This valve needs to stick above the water, so the operator can get a visual clue that there is excess pressure.
Does anyone has any ideas what kind of valve would be suitable? This is my first experience with pressure/relief valves.
Thanks.
D.T
I am working on a retrofit of a water jetting system which consists of a 30 HP pump pumping water through a 6" PVC pipe which is sealed at the other end, but has 1/8" holes spaced 6" apart. The purpose of the system is to "jet out" water from the 1/8" holes to keep sediment from settling in a river intake.
The system failed in operation in the past because in the non-pumping season, the 1/8" holes fill with biologic growth and debris, thus causing undue pressure in the system and tripping of the pump.
The idea is to install a "pressure valve" or "relief valve" which would allow the egress of excess pressure. This valve needs to stick above the water, so the operator can get a visual clue that there is excess pressure.
Does anyone has any ideas what kind of valve would be suitable? This is my first experience with pressure/relief valves.
Thanks.
D.T





RE: Pressure release for sediment jetting system
It sounds like what you are looking for is a surge relief valve. They are typically setup so that if the pressure on the line exceeds their setting they will open and discharge. The discharge could be set above the water surface so that the operator would see that it has opened. Clavalve is one manufacturer, I am sure there are others.
HTH
RE: Pressure release for sediment jetting system
http://www.cla-val.com/pdfs/E-750-01.pdf
RE: Pressure release for sediment jetting system
RE: Pressure release for sediment jetting system
P.S. Put a gooseneck and bug screen at the top of the standpipe.
RE: Pressure release for sediment jetting system
The valves I found based on the suggestions have cast-iron or steel parts in them. The river intake being at the bed of the river, the valve will periodically be submerged in high-flood events. Attempting to raise it higher than the high-flood level is not practical since it will involve a standpipe more than 40' high. I would like to use a valve which can operate under submergence (i.e., it has stainless steel parts).
Any ideas?
RE: Pressure release for sediment jetting system
http://www.plastomatic.com/rvt.html
There are all-stainless relief valves available from a number of mfrs. A good company to talk to is North American Safety Valve. http://nasvi.com/nasvcat.htm. They rep a number of brands, including Farris and they have competitive prices.
If the relief valve is sized for full flow, it will be large and expensive. I don't know what flow rate you have here, but if the 6" pipe is any indication, you are talking about an expensive relief valve, probably in excess of $3,000.
I think you'll find that the same problems you're having with plugged orifices will show up in a submerged relief valve as well, regardless of material.
If you're just trying to protect the pump from dead-headng, you could install the relief valve near the pump discharge or install a pressure switch.
RE: Pressure release for sediment jetting system
RE: Pressure release for sediment jetting system
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: Pressure release for sediment jetting system
RE: Pressure release for sediment jetting system
I think Artisi already mentioned that solution. Run it for a few minutes on a regular basis. Probably will have other benefits as well.
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: Pressure release for sediment jetting system
Do you have some type of strainer on the pump suction or intake?
RE: Pressure release for sediment jetting system
thanks