Water Flow Pipeline

any of the sizes you stated will work....to a point. the problem is at what delivery preassure you want......if you're simply flooding a pond or channel, you're good. if you want to operate a sprinkler system you need much More info on pressure drop and how far you want the water thrown

thanx fredski but my prblm is to throw 100gallon per mint 600 feet far from source via 1" dia. of pipe without any pump. no sprinkler to use.

You state the water is being continuously provided to you....how?

...at what pressure and at what height? i.e., what is the difference in elevation between the place3 the water is being provided to you and the place you want it ultimately.

This is essential to answering your question.

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Even without that info, you can be assured with certainty that 1" pipe will be too small. You will probably need something larger than 4"pipe.

You will definitely need a larger pipe, maybe 2", 3", or even more. It also depends on how much lower the delivery point is compared to the source.

Free Online Manning Pipe Flow Calculator

The only things I can tell you from this information is that a one inch pipe this long will hold just under 25 gallons of water. So to transport 100 gallons of water per minute 600 feet in a one inch pipe will require a water velocity of about 40 feet per second. The elevation change and the collection of other unknowns others have asked to know will depend greatly if this task can be done. I suspect that a velocity this fast will induce some considerable drag on the water regardless of gravity. At the same time a strong enough pump can push water nearly anywhere.

I found this to be useful:

http://www.polypipe.com.au/images/PPI%20small%20farm%20design.pdf

A lot depends on whether the inlet of the pipe is sufficiently submerged, and thus the pipeline is operating under a pressure head to deliver the needed flowrate.

Or, the pipeline is operating under gravity flow with appropriate gradient (slope).

I have my doubts whether a 1-inch diameter pipe that's 600 feet long can deliver 100 gpm under gravity flow conditions...a lot depends on the pipe material and it's roughness coefficient as well as the slope.

honestly, I think you need to bump-up the pipe size to at least 3" and use HDPE pipe.

I haven't run the calculations.....it's too late here and I'm hitting the sack. Maybe tomorrow morning I'll do it.

'....I have my doubts whether a 1-inch diameter pipe that's 600 feet long can deliver 100 gpm under gravity flow conditions.....'

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I'm with you on this one. If the pipe were vertical, a typical 1" PVC pipe might deliver 4 gallons per second, but my bet is the elevation provided in this situation isn't more than a few feet for the 600' horizontal.

No way to get to 100gpm with less than 100' rise in 600'

Yuppers, it's called CRITICAL DISCHARGE as it relates to gravity pipelines. You can stand the entire pipeline perfectly vertical and can get only so much flowrate through it if the inlet is not under a pressure head (ie, submerged inlet conditions).

Qcr = 2.58 * D^2.50 (in CFS) for round pipes. This is the maximum discharge a gravity pipeline can convey water through it, regardless of the pipe slope and roughness coefficent. It generally occurs at two depth of flows within a round pipe, approximately @ d/D ~ 0.5 (@ 50%) and d/D ~ 0.82 (82%).....those numbers are off the top of my noggin'. I could get more precise numbers by running my pipeflow program(s).

once the pipe is full and the water is flowing it will siphon whatever amount of water flow is created relative to the difference in heights of the source and destination. 600' at 1/8 inch fall per foot is only 75 inches in fall but the speed of 40 gallons at about 9 pounds a gallon flowing downhill his huge.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&cad=rja&ved=0CEAQ8AEwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DHq5KCVPU_EE&ei=VuDPUL7-FZOY8gS0sYHQBQ&usg=AFQjCNHVvoAKtn0nFjRpvrCv4gE-43dl2A&sig2=ax49J2e0Rams-BOycod7XA&bvm=bv.1355534169,d.eWU

I get this flow from 50' of 1 1/2" pipe with a 3' long sand point laying horizontally in 6" deep trough and about 10 feet of head height.

'... it will siphon whatever amount of water flow is created relative to the difference in heights of the source and destination...'

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Are you suggesting 1 inch PVC with a 10ft drop over a distance of 10 ft and 1 inch PVC with a 10ft drop over a distance of 1000ft will have the same flow if they have the same difference in height between respective source and destination ?

Actually, because water is rather heavy and therefore has momentum once it gets moving, the longer pipe may move more water at a faster flow rate, even with the same head height.

depends on the inlet restrictions if any...

also if you leave a mild coil in the pipe the water will flow faster...water is weird.

um....no.

With all other conditions the same, and no significant inlet restriction....just 1" PVC at full flow, a run which drops 10' in 10' will have about 10 times the flow of one that drops 10' in 1000'.

So how large would the drop have to be over a 1000' run to have it flow about the same as a 10' run with a 10' drop? The 1000' run would have to have about 1000' drop to have a similar flow to the 10' run with the 10' drop.

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If this doesn't make sense, either look over your theory to find what is missing (hint: don't loose your head) or go run some experiments.

I just ran some fast calculations, assuming the pipe is only gravity flow and not operating on a inlet pressure head.

100 gpm = 0.223 cfs

Assuming HDPE or PVC pipe, I used a Manning's n=0.013. Assuming that the pipe slope is 1.00%, you would need a 6" diameter pipe to convey the flow. V=2.6 FPS and flow depth is roughly 1/2 pipe depth (d/D~0.50 +/-).

Let us start at the beginning - is this US or imperial gallons?

Then give us some detail to respond to.

A 2kW, 3" electric pump can be capable of pumping 10l/s = 600l/min = ~160us gal/min, so depending on the levels between supply and use, and the pressure available, a 3" pipe may suffice.

Do you need 100gal/min for your irrigation, or is that the max available?

Dear malixhabib

One of the criterion is the VELOCITY of the flow in the pipe line. Normally it is 1 to 1.5 Metres/Sec. and the Frictional Head is to be accounted for and decide the over-all head required, since the distance is 600 Feet away from the source, definitely sufficient head is required to push the water.

DHAYANANDHAN.S

Why a pipe? Why not a ditch?

Hello guys,100 gallons per minute is good and can you tell me where you use these gallons of water??i think 1inch pipe line is good for the that..the leegth of pipe is wide this is good for the irrigation and huge amount ofwater is out in the minutes..