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Old 08-28-2013, 03:39 PM
mjstef mjstef is offline
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Flow from 1" copper............

Got a really good customer of mine that wants 1.25 acres under irrigation and it's been many years since i have done a system this large. We are trying to get away with the least zones possible due to the rocky nature of the soil on the property. I am trying to remember what a 1" copper pipe will flow at 40 PSI. The well pump is 1.5HP 20-25 Gal per minute, 290' deep with static level of 240' per the installer. I would imagine the 20-25 GPM is with the 1 1/2 main line wide open and no pressure. Cannot find consistency between flow charts i find online! 1 says 38 GPM and another says 13.5 GPM for a 1" line at 40 PSI! Any help would be appreciated. Normally i would sub a job like this out but all companies here are at least 3-4 weeks out and we need to get sod down as winter is on it's way!!! Thanks!
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Old 08-28-2013, 04:03 PM
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Mike Leary Mike Leary is offline
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If it's 1" Type "K" copper, you'll get 12 gpm if you follow the five feet a second rule. Bear in mind, per 100', you'll lose close to 6 psi in friction loss.
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Old 08-28-2013, 04:30 PM
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DanaMac DanaMac is online now
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Flathead Valley, MT? I was just there in Bigfork two weeks ago. My brother lives there. Beautiful area, love it.
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Old 08-28-2013, 05:43 PM
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Mike Leary Mike Leary is offline
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Seems strange that copper is used out there, is there a reason to not use poly?
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Old 08-28-2013, 05:55 PM
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irritation irritation is offline
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Quote:
Originally Posted by Mike Leary View Post
Seems strange that copper is used out there, is there a reason to not use poly?
I doubt it was used from pump to house, in fact a 1.5 hp pump should have at least 1-1/4" piped to the pressure tank.
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Old 08-28-2013, 06:16 PM
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Cape Atlantic Landscaping Cape Atlantic Landscaping is offline
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1.5 inch Sch. 40 would carry that 20-25 GPM a lot nicer than the 1 inch copper and only has a friction loss of 1.75 PSI per 100ft.
When designing with a pump if the well installer tells you 20 or 25 GPM I would stay with the lower number and then do a 10% rule and then design at 18 GPM
What is the static pressure at the POC?
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Old 08-28-2013, 06:37 PM
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Wet_Boots Wet_Boots is offline
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How is one-inch copper of any sort, a part of the irrigation picture here?
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Old 08-28-2013, 08:56 PM
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greenmonster304 greenmonster304 is online now
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Quote:
Originally Posted by Wet_Boots View Post
How is one-inch copper of any sort, a part of the irrigation picture here?
It's probably the feed to the house after the pressure tank which is where he is thinking of tapping.


He could dig up and tap right by the pitless. This way he could eliminate the house plumbing completely.
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Old 08-28-2013, 11:44 PM
mjstef mjstef is offline
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Correct. Feeding from the pressure tank in the basement. Will pick up 1" poly right outside the house. Same way my house is plumbed and i have 18 zones. Not even going to try and dig at the well line as it had to be blasted in. With the yard hydrant wide open the well holds just under 45 psi................
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1995 F350 Crew Cab 4x4 5spd PSD with Fisher EZ-VEE plow.
1994 F250 Regular Cab 4x4 Slusbox 351 gasser.
2012 Grasshopper 725D T6 with 52" Mulching and 61" Side Discharge/Bagging decks.
2009 Encore FZ48 Front Mount Side Discharge & bagger.
3 Ariens LM21 Commercial walk behinds.
Echo SRM28 trimmers.

Last edited by mjstef; 08-28-2013 at 11:52 PM.
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Old 08-29-2013, 12:49 AM
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1idejim 1idejim is online now
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Quote:
Originally Posted by mjstef View Post
Correct. Feeding from the pressure tank in the basement. Will pick up 1" poly right outside the house. Same way my house is plumbed and i have 18 zones. Not even going to try and dig at the well line as it had to be blasted in. With the yard hydrant wide open the well holds just under 45 psi................
I am with GM, close as possible to the well head.

Static means little.
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