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  #1  
Old 07-11-2008, 07:08 PM
offshore1234 offshore1234 is offline
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Design/gpm Help!!

I am starting a homeowner system and need some help getting started. I was told to cut into the 1 inch copper line just ahead of my 3/4 meter. I put a "T" in the line. From that I ran a psi gauge and down from that a stop valve. Then another right angle down to drain into a 5 gal bucket. I ran 3 tests. The static pressure is 56 psi. I tested the flow at 50 psi = 12.5 gpm, 45 psi = 16.5 gpm, and 40 psi = 21.4 gpm. QUESTIONS: First was I correct to do this, if so, now what do I do. Which of these numbers do I use to configure the system. I was going to run the system main with 1 inch copper and the laterals with 3/4 poly. Is that correct? What should I use? I read that the gpm should be around 18. I have glanced at the irrigation tutorial and it is alittle confusing. Any advice to get me in the right direction would be greatly appreciated.

I tried to attach a drawing of what I did.
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  #2  
Old 07-11-2008, 07:32 PM
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AI Inc AI Inc is offline
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Have you considered hiring soimeone for this?
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  #3  
Old 07-11-2008, 07:57 PM
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Mike Leary Mike Leary is offline
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Have you considered hiring soimeone
I thought she was busy with with the SHESHOVEL project.
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Old 07-11-2008, 08:28 PM
offshore1234 offshore1234 is offline
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Yes I have considered it, however I would like to try this on my own. Thanks for the comments, however any comments that might help out would be greatly appreciated. Thanks in advance.
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Old 07-11-2008, 08:47 PM
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Mike Leary Mike Leary is offline
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Quote:
Originally Posted by offshore1234 View Post
Yes I have considered it, however I would like to try this on my own. Thanks for the comments, however any comments that might help out would be greatly appreciated. Thanks in advance.
You might understand that the guys that really know their stuff are in the
middle of the season & don't have time to spit. The only comments you're
going to get are from we hacks.
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  #6  
Old 07-11-2008, 08:50 PM
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Dirty Water Dirty Water is offline
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I'm assuming you got the lowest PSI (40 psi) with the stop valve wide open, so I'd design the system around 14 GPM, because you will have friction loss from the pipe runs. You want to keep your running pressure above 40 psi if at all possible.
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Old 07-11-2008, 08:59 PM
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Mike Leary Mike Leary is offline
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Originally Posted by Dirty Water View Post
I'm assuming you got the lowest PSI (40 psi) with the stop valve wide open, so I'd design the system around 14 GPM, because you will have friction loss from the pipe runs. You want to keep your running pressure above 40 psi if at all possible.
Hack.........
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  #8  
Old 07-11-2008, 09:19 PM
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Dirty Water Dirty Water is offline
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Hack.........
Don't make me hop on the ferry and kick your old ass

Want to quantify your response to my answer?
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  #9  
Old 07-11-2008, 10:22 PM
offshore1234 offshore1234 is offline
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At 40 psi the stop valve was not fully open.
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  #10  
Old 07-11-2008, 10:39 PM
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Wet_Boots Wet_Boots is online now
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How many acres are you watering?

By the way, "just ahead of" means "upstream of" ~ if you bypass the water meter, things could get ugly.
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