Lifespeed
Member
Hi,
3 years ago I installed an Accurain sprinkler system (3 sprinklers) using 160' of 3/4" schedule K copper buried 2 feet deep. It worked great until about a month ago when I replaced the sprinklers with an updated model utilizing a different electronic feedback valve.
Not surprisingly, the new valve characteristics now generate water hammer. It was helped somewhat by the installation of a 3/4" arrestor where the house plumbing connects to the sprinkler. (I know ideally I should have an arrestor at each valve, but this is fairly impractical) But the problem hasn't been eliminated. The arrestor has a fairly small hole in the brass pipe fitting leading to the diaphragm and standpipe, which does not seem like such a brilliant idea. Perhaps it damps the resonance through flow restriction?
When I put in the system I utilized an existing sprinkler connection to the house installed by an idiot. It is 1/2" (undersized for any sprinkler system but the unique Accurain) galvanized pipe that runs the length of the house, a good 60'. I suspect one of the primary problems is this long, skinny run of pipe feeding a 3/4" pipe terminated with three solenoid valves.
So my question is: Would replacing the long 1/2" pipe with a shorter 3/4" pipe to the nearby bathroom plumbing fed by 3/4" galvanized pipe cure the problem?
3 years ago I installed an Accurain sprinkler system (3 sprinklers) using 160' of 3/4" schedule K copper buried 2 feet deep. It worked great until about a month ago when I replaced the sprinklers with an updated model utilizing a different electronic feedback valve.
Not surprisingly, the new valve characteristics now generate water hammer. It was helped somewhat by the installation of a 3/4" arrestor where the house plumbing connects to the sprinkler. (I know ideally I should have an arrestor at each valve, but this is fairly impractical) But the problem hasn't been eliminated. The arrestor has a fairly small hole in the brass pipe fitting leading to the diaphragm and standpipe, which does not seem like such a brilliant idea. Perhaps it damps the resonance through flow restriction?
When I put in the system I utilized an existing sprinkler connection to the house installed by an idiot. It is 1/2" (undersized for any sprinkler system but the unique Accurain) galvanized pipe that runs the length of the house, a good 60'. I suspect one of the primary problems is this long, skinny run of pipe feeding a 3/4" pipe terminated with three solenoid valves.
So my question is: Would replacing the long 1/2" pipe with a shorter 3/4" pipe to the nearby bathroom plumbing fed by 3/4" galvanized pipe cure the problem?
Last edited: