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Tool Talk Discussion Forum

Small Centrifugal Irrigation Pumps

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Dave_N_Ga

05-08-2005 06:33:35




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I'm assembling a temporary irrigation system and drawing out of my creek to water a new 2 1/2 acrespasture. I'm looking at small gas powered irrigation pumps, Pacer makes two economical models, one powered by a 5 1/2 HP Briggs @ $289, the other is a 3 1/2 HP @ $219. Either one has the specs I'm looking for.
Anyone have any experience with these or suggestions on other brands?. I'd also like suggestions on sprinkler heads.
I'll fess up now, the pump is available at Harbour Freight among other places.

Dave

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dan67

05-08-2005 19:43:16




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
should work, been useing a 5 1/2 pacer for five years now in the same way your talking. I use 2" poly pipe to get to location approx 100 feet. Then run 3/4 in garden hose, have 10 different heads. At wide open it still can blow the hose off the nipple if clamps are not kept tight.



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greenbeanman in Kansas

05-10-2005 06:12:42




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 Re: Small Centrifugal Irrigation Pumps in reply to dan67, 05-08-2005 19:43:16  
I certainly stand corrected. I didn't realize that they built up pressure to speak of at all.



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Gary Schafer

05-08-2005 19:42:38




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
Look at the Rain bird site. They should tell you how to figure pump and sprinkler size. You need to first figure how many inches of water you want to put on the ground. Then you can figure what size sprinkler you need to do that in what amount of time. From there you figure the pipe size needed for the number of gallons delivered and friction loss in the pipe. Then what size pump it will take.

It takes a lot of water to do much irrigating. If you use big enough sprinklers you will need some pressure to make them work. Otherwise the sprinklers will just pee out. Not uncommon to run from 40 to 150 lbs pressure. If you run any distance then good size pipe is needed to avoid excess pressure drop from friction.

If you are in need of some larger pipe I have lots of 3" by 30 foot lengths with rain bird #30 sprinklers on them. Located in Wisconsin. Was used on a strawberry farm.

Good luck
Gary

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havvey

05-08-2005 10:53:11




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
they use them around here for small truck gardens they work ok but the plastic pump does not have the quality that say a gorman rupp fire pump does.



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Glen in TX

05-08-2005 08:48:45




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
It's going to depend on what size pipe you want to use or tying into a underground sprinkler or how far you want to run the water. You will want the sprinkler heads with replaceable nozzles available in different sizes so you can adjust your flow to the pipe and pump supply. We ran 10-15 joints of 1 1/2" sprinkler pipe on a 3 1/2 HP pump like that but on flat ground too. Ran 4" sprinkler pipe with larger nozzles 1/4 mile on a 2 1/2" submersible pump. A good local sprinkler company should be able to help you do some figuring on what size pipe and nozzles to use. If you're going up any kind of slope you'll want a larger pump to fight friction loss too.

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Dave_N_Ga

05-08-2005 09:54:28




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 Re: Small Centrifugal Irrigation Pumps in reply to Glen in TX, 05-08-2005 08:48:45  
Here's what I have .... A 2" suction line with a max lift of 4', the first 150 feet on the pressure side is 2" and has a 20, mabe 25 foot of head. At the top of the incline I have 100' of 1 1/2" and 100' of 1 1/4". I only plan on having 4 or 5 sprinklers max. I was going to use 3/4' garden hose and I'm willing to move the sprinklers around as this is a temporary system to keep the soil moist during the dry weeks.

Keep the ideas comming guys, it's getting very dry here in the Atlanta area, I have to make a decision soon and would like all the suggestions I can get.

Dave

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MAC,IL

05-08-2005 08:45:10




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
Dave: I have worked with both gas and elec pumps.
All we were concerned about was output volume. Not much pressure on the output. So I dont know about using one with any restriction. Might be worth more research before purchasing that pump. my .02 cents. Guy up the road a couple miles has a big sprinklers system mounted on wheels, maybe a couple hundred feet long, I have seen him push a lot of water, but have no inklings as to what type pump he uses.

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greenbeanman in Kansas

05-08-2005 07:35:35




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 Re: Small Centrifugal Irrigation Pumps in reply to Dave_N_Ga, 05-08-2005 06:33:35  
Just my opinion but that kind of pump is for moving larger quantities of water without pressure build up. I'm not sure how they would work having to push through sprinkler heads. Hm?



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