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Old 10-08-2002, 04:01 PM
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MLI MLI is online now
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blowout lawn sprinklers

what size compressor would I need to blowout my own system? How much psi is needed? thanx
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Old 10-08-2002, 10:45 PM
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At least a 10 CFM Compressor. Set the regulator at about 50-55 PSI. Run every zone for about 5 minutes or until no more water is spraying out.
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Old 10-12-2002, 11:59 AM
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thanx for the info...
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Old 10-14-2002, 10:47 AM
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DanaMac DanaMac is offline
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Honestly. I don't know the size of the compressor I use. Basically it is a tow behind, diesel engine compressor that I get at the rental shop. I do have it set at about 80 psi though. Usually I can blow out 2-3 residential zones at a time and they only need a couple of minutes.
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Old 10-14-2002, 05:27 PM
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DanaMac

You have any pics of how you hook up the compressor to the blowout point? I'm looking for a new way do do this. Right now, I blow out a baseball field with a 3" main and I rent a tow behind for that, and I hook up a key to the Rainbird Quick Connect Right after the PVB with the air hose hooked up to the key. Does anyone hook up to the test coc on the backflows?
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Old 10-14-2002, 07:05 PM
HBFOXJr HBFOXJr is offline
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test cocks

They restrict air too much. Depending on the GPM of the zones the single hook up may marginal.

With that size stuff we double hose and connect.
1. 2 hoses off the compressor to a double connection on the key

or
2. better yet, 2 hoses off the compressor with 2 key hook ups or threaded pipe inlets.

These larger jobs should have the equivalent of a RainBird #44 or #55 QC valve set up.

The common 50-75 ft 3/4" hose lengths really affect performance at the high volumes of air so 2 are much better.

To make an easy 2nd connection anywhere, you can buy snap on PVC saddles that bond up with glue. Very reliable and strong. Get a 3/4" hole saw to cut the hole after installation. Make sure you use a pipe size by 1" female pipe thread snap on "t". Install a pvc plug with teflon paste, no tape or pipe dope after your done.
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Old 10-14-2002, 08:35 PM
Ground Master Ground Master is offline
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Good tip, Harold. I've seen many guys running what looks like 3/8" hose one might use for air tools.

I use a 5hp gas compressor that does a good job of blowing out residential systems. Its not a perfect setup, as occasionally I have to run through a zone twice. I use this setup for systems with a 3/4" water line, which is the majority in colorado springs. I even have an electric hose reel mounted on the truck which makes handling 3/4" hose a snap. I will try and post a pic soon.

I'll set-up my bigger blow-outs (commercial) on the same day and rent a tow behind.
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Old 10-15-2002, 12:03 AM
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HAROLD

what do you use for smaller systems i.e. residentials?
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Old 10-15-2002, 11:03 AM
Ground Master Ground Master is offline
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I've seen recommendations of 10 to 25 cfm for small systems as well as recomendations of 20 to 50 cfm for small systems (systems with a 3/4" mainline into the house).

I've been using a 5hp gas compressor for 10 years or so (10 cfm) with good results. It does have a 20 gallon tank that I charge up to 60 psi and then I open the valve SLOWLY. This has worked well for me, although I have seen that it is not recommended to build up pressure in an air tank. I suppose the sudden rush of air can cause to much heat.......but I think if you can control the flow you can reduce the risk.


I'd like to rent a bigger compressor in the 12 to 13 hp range (25 cfm) to see how well they work for residential systems. I think these units may be a good compromise between a small setup (like mine) and the big tow behind units.
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