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Old 04-29-2014, 11:28 PM
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cjohn2000 cjohn2000 is offline
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Time for a PRV

Started a site today, small apartment complex 1.5 or 2" dcva in basement mechanical room. Most zones are 10-25 gpm. Noticed alot of 6" popups cracked along the sides and one the top of the body cap and wiper seal had blown out, leavin just a threaded nut behind and every time I turned a zone back on it seemed more heads were cracked. Finally I took a dynamic pressure reading on a zone and I got 98psi! PPV definitely needs to be installed asap. Oh and I found this gem, 2" popup installed in a 4" body with the remains of a riser in the base
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Old 04-29-2014, 11:48 PM
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irritation irritation is offline
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Freeze damage, never use the side inlet.
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Old 04-29-2014, 11:57 PM
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cjohn2000 cjohn2000 is offline
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Maybe, all the heads I ended up replacing were bottom inlet. With 98psi everytime that valve snapped on it seemed to blow another head out
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Old 04-30-2014, 12:03 AM
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irritation irritation is offline
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I have one area that has crazy high city water pressure. The 1800's last but it kills the PGP's.
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Old 04-30-2014, 12:30 AM
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cjohn2000 cjohn2000 is offline
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Im not usually a big fan of cutting in PRV's at the POC, but the pressure is tearing this system apart.
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Old 04-30-2014, 08:15 AM
Without A Drought Without A Drought is offline
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my guess is freeze damage. those heads can handle 100psi. not ideal, but they can hold up to that. freezing, not so much.
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Old 04-30-2014, 01:19 PM
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Wet_Boots Wet_Boots is online now
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Sight unseen, a standard PRV is less of a good choice than a pressure regulating master valve, on account of the standard PRV having much higher pressure losses.
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Old 05-01-2014, 01:18 AM
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cjohn2000 cjohn2000 is offline
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Quote:
Originally Posted by Wet_Boots View Post
Sight unseen, a standard PRV is less of a good choice than a pressure regulating master valve, on account of the standard PRV having much higher pressure losses.
Hadn't thought about that, would be cheaper too, parts wise.
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Old 05-01-2014, 04:13 AM
greendoctor greendoctor is offline
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You do not want cut in a PRV. I have had to bypass a lot of PRVs. They restrict flow unless sized way above pipe size. Especially if they were not necessary in the first place. Under 100 PSI, not needed, nor desirable. Most valves and irrigation equipment are capable of handling up to that. If you have to, test static pressure, figure out your system gallonage, then see which PRV will be able to supply the gallonage called for under those conditions. On a 2" main line, that might mean a 21/2" or 3" PRV. I say this because many systems in high pressure areas were designed to make use of the pressure and volume. In an ideal world, they would be designed for what the equipment specs call for. 1800 pop ups do not need a lot of pressure, but they demand high volume.
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Old 05-01-2014, 07:28 AM
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CAPT Stream Rotar CAPT Stream Rotar is offline
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Thats a heavy push!

anything over 60 psi and those pgp's will have an extreme half life.
Sh!t head.
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