pumping water using the suction side of pump?
pumping water using the suction side of pump?
(OP)
I was asked about the following project, I would appreciate any comments on it.
The project consist of conveying 7.8cfs of irrigation water 1.5 miles in pvc pipe. Very little drop, approximatly 2"/0.5 mile.
The question presented me was, Is there a way to place the pump at the down stream end of the pipe vs installing it on the up stream end.
The reason for this request is convienance. The pump would be easier to monitor at the downstream end vs the upstream end.
The water is currently conveyed by an open ditch, originating at a resevior. They are wanting to install a pipeline to conserve water and are looking at the cost of using a pump vs gravity so a smaller pipe diameter can be used to save some money.
My first reaction was "IT WAS ASKING FOR TROUBLE".
But I sure do like the idea. Isure would appreciate some input.
Thank
Tom
The project consist of conveying 7.8cfs of irrigation water 1.5 miles in pvc pipe. Very little drop, approximatly 2"/0.5 mile.
The question presented me was, Is there a way to place the pump at the down stream end of the pipe vs installing it on the up stream end.
The reason for this request is convienance. The pump would be easier to monitor at the downstream end vs the upstream end.
The water is currently conveyed by an open ditch, originating at a resevior. They are wanting to install a pipeline to conserve water and are looking at the cost of using a pump vs gravity so a smaller pipe diameter can be used to save some money.
My first reaction was "IT WAS ASKING FOR TROUBLE".
But I sure do like the idea. Isure would appreciate some input.
Thank
Tom





RE: pumping water using the suction side of pump?
It'll come down to finding the right pump for your hydraulics.
RE: pumping water using the suction side of pump?
Correct it will be a gravity fed suction line. Air will be a problem. Air release valves will probably be needed.
I am worried about sucking the pipe down.
Thanks for your input
Tom
RE: pumping water using the suction side of pump?
If you end up doing this, I would recommend turning down the outlet of the pipe into a pit (water seal) to get a little extra head, and pumping from the pit with a sump pump.
RE: pumping water using the suction side of pump?
If you locate the pump at the source you could allocate around 60 to 90 psi to the friction drop and your line would be only 12". The cost differential of the pipe alone should make it better to place the pump at the source.
How high is the reservoir? It may be feasible to forget the pump and just use gravity.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: pumping water using the suction side of pump?
RE: pumping water using the suction side of pump?
RE: pumping water using the suction side of pump?
7.8cfs (3,500 gpm) would travel through an NPS 12 (sch. 40) pipe at 10 fps. You're talking pretty healthy PVC pipe and rconner is right, a pump for that volume won't come cheap.
RE: pumping water using the suction side of pump?
RE: pumping water using the suction side of pump?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: pumping water using the suction side of pump?
The reason for pumping vs gravity is the cost of 18"pipe for gravity feed.
The water will exit the dam from an existing gate. the pump will e placed in the reservior.
Thanks
Tom
RE: pumping water using the suction side of pump?
RE: pumping water using the suction side of pump?
This is an appropriation so all 7.8cfs has to be used or it will be taken away.
The draw currently varies due to the level in the reservior and actually the reservior is small and silted in. there are other appropriators up stream causing the leel to change.
This is another reason for using the pump instead of the just gravity, to make sure the full appropriation is taken.
moving the reservior down stream is not an option since the reservior is actually owned by an irrigation district.
Thanks
Tom