Yak54 wrote: ↑Sat Jan 21, 2023 9:58 am
Wow! 20 GPM is a huge gain !
I had the original copper pipe running from the meter to the house and to the nearest hose bib.
I had 50 psi and 10 gallons a minute.
Then I cut into the 3/4 line and came out with a 1 inch tee to a full opening non restricting ball valve then jumped up to 1 1/2 inch PVC.
out of that I got really close to 30 gallons a minute at 50 psi.
At that pressure there was minimal friction loss in the 1 1/2 pipe.
The industry standard for feet per second in water flow in pipe is around 7.
Mine with a calculator dropped down to almost 1 I think because it's been several years.
I had several so called experts say I was wrong and you couldn't do what I did.
None of them had any kind of degree in hydraulic engineering.
The other thing I did was to buy 1 inch control valves and I never ran anything smaller than 1 inch pipe to reduce friction loss and keep the velocity down.
Only going to 1/2 inch at each head.
I got all this information from a web site called irrigation tutorials.
The guy knows what he's talking about.
The other information came from my experience with deluge systems made for fire protection.
Total pipe in my yard is close to 1000 feet.
I ran all control wire with 16 and cable tray direct burial but I ran it underground in pvc conduit.
Conduit and pipe was buried 18 inches underground.
The minimum is 6 inches.
Put it all in by myself with 3 city inspections and approved drawings I made myself upon completion.
The city inspector said it was the best irrigation system he had ever inspected.
Needless to say I saved untold thousands of dollars.
What I'm poor at is pump calculations.
They make so many different kinds for different uses it boggles the mind.