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kwahsttonk

Unregistered

1

Friday, August 6th 2010, 4:48pm

pump confusion

Hi all... I'm trying to build a sprinkler system. I'm trying to do it VERY cheap and VERY basic because we're likely moving soon. As such I'm hoping to build a simple above ground system using PVC and a few garden hoses to be run by a sprinkler pump drawing water out of my irrigation ditch. My main confusion is this:

I've been told that it's very important to have enough impact heads coming off of my centrifugal pump so that I don't damage the pump. So the question is, how do I determine this? I guess I don't understand the relationship between PSI and GPM. How do I determine what kind of PSI/GPM I'll be producing so that I can determine how many heads I need? I'm planning on needing maybe 15 impact heads (it's about a 1/3 acre lot) and need to know if I can run that all at once off a 1 HP pump.

I know this is pretty vague, but can someone give me some good guidelines? Thanks in advance...

PS - I can provide more specifics if needed... just ask ;)

hi.todd

Supreme Member

Posts: 412

Location: Houston, Texas

2

Saturday, August 7th 2010, 8:58am

Your pump needs to be designed or specified based on your need or gallons per minute. You also need to take into consideration your elevation difference from the pump to the sprinkler heads. How many feet, What is the pressure requirement of the sprinkler head. What is the gallons per minute you want to keep flowing through the pump. Break it up into 2 or 3 zones, you don't have to run all 15 heads on 1 zone. Choose a head good with low pressure like find out how many gallons per minute it uses on 45 to 50 pounds of pressure. Add up the gallons per minute until you get to 10 or 12. Break to a new zone or valve and do it again. Repeat and that will give you your number of zones.

Good luck.

This is basic I don't know your particulars, but this should get you started.

:thumbsup: :thumbsup: :thumbsup:
:thumbup: :thumbsup:

kwahsttonk

Unregistered

3

Saturday, August 7th 2010, 1:51pm

Your pump needs to be designed or specified based on your need or gallons per minute. You also need to take into consideration your elevation difference from the pump to the sprinkler heads. How many feet, What is the pressure requirement of the sprinkler head. What is the gallons per minute you want to keep flowing through the pump. Break it up into 2 or 3 zones, you don't have to run all 15 heads on 1 zone. Choose a head good with low pressure like find out how many gallons per minute it uses on 45 to 50 pounds of pressure. Add up the gallons per minute until you get to 10 or 12. Break to a new zone or valve and do it again. Repeat and that will give you your number of zones.

Good luck.

This is basic I don't know your particulars, but this should get you started.


So are you saying I NEED to break it into zones? Because I'd rather not... for simplicity, i'd love to have all the heads run at once. The impact head I was looking at has these specs:

Performance Chart
PSI -- Radius -- GPM -- Bars -- Meters -- M3/h
25 --- 35 ------ 2.8 ---- 2,0 -- 11,0 -- 0,68
35 --- 38 ------ 3.3 ---- 2,5 -- 11,7 -- 0,78
45 --- 40 ------ 3.7 ---- 3,0 -- 12,1 -- 0,83
55 --- 41 ------ 4.1 ---- 3,5 -- 12,5 -- 0,89

That head uses around 4 GPM at the PSI you suggested... So, is it as simple as taking 4 GPM x 15 heads and getting 60 GPM pump requirement? (btw, my pump, water and heads are all about the same level.

hi.todd

Supreme Member

Posts: 412

Location: Houston, Texas

4

Saturday, August 7th 2010, 2:19pm

O.K. So you are trying to space the heads about 40 ft apart.
In my opinion you won't be getting 60 Gallons Per minute at 55 PSI with a 1 Horsepower Pump.

You will probably be able to get 15 or 20 gallons per minute at 55 PSI. Can you get some information on the pump. There should be a chart with flow rates and pressure rates.

In my opinion you will probably need to break this into 4 zones, but you need to get the specifications on the pump. You should also make sure you have filtration on the pump system. Depending on the water quality you may want to get self cleaning scrubber valves for the project also. :thumbup:
:thumbup: :thumbsup:

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