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Starting Member


Thursday, April 8th 2004, 8:03am

main line sizing?

First I'd like to thank you for all the information and support available on this site. Now for my question...I will be running a main line around my yard and off of that line I will locate my valves for the zones, what is the typical size of poly used? Should I go with 1-1/4" for the main line or can I just go with 1" so I'm dealing with one size pipe? I'm using a well point for my source with a pump and pressure tank set-up. A 1-1/4" would provide more volume but would it be necessary using the pressure tank? I would just as soon go with a 1" poly if I could get away with it and I'm not sure about price difference between the two sizes. Thanks in advance and let me know if I need to provide more info!
Oh, one more thing...since I'm going with pe pipe I'd like to use a master valve at the source. I've only seen valves as large as 1" and if this is the case reducing from 1-1/4" to 1" and back to 1-1/4" would significantly reduce pressure would it not. What is done in this case?
thanks again!


Advanced Member

Posts: 229

Location: USA


Thursday, April 8th 2004, 10:03am

It depends on what your GPM is and the run length to figure out any pressure losses that would occur which then would make sense going to a 1". If your drawing from a well, I'm assuming your GPM's are average for 1" pipe


Supreme Member

Posts: 372

Location: USA


Monday, April 12th 2004, 5:08am

Also I dont see the need for a pressure tank because they are used to keep your system from cycling on and off like when you flush a toilet or run a faucet. For irrigation you will design it so when your system comes on the pump will start and it will shut off when you are done irrigating.


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