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 Air in my sprinkler lines, big thumping in house
Author: rlmplumber (CA)

I have 9 stations in my sprinkler system. Never had thumping until I had to turn house water off recently.

Now have thumping in 3 (1,2,3) of the stations. The others don't thump.

Turned my sprinklers off this morning because thumping is so bothersome.

So I tried what the web suggested I removed sprinkler heads from station 1,2,3 and ran water through those stations for about 5 minutes or so. Shut off the stations and attached sprinkler heads, and tried to water, no luck, still thumping.

This is driving my nuts. How do I fix this?????? Where the main line enters the sprinkler valve boxes there is not an on/off drain valve. I do have a valve to turn the water off to the sprinkler system.

Can someone help me.


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 Re: Air in my sprinkler lines, big thumping in house
Author: rlmplumber (CA)

It turns out that the sprinklers are not on their own dedicated line.

It is a hard water line bypassing the water softener and house lines.

I also have 3 on/off water faucets on the sprinkler hard water line. They were installed so I would not have to use soft-water to water the yard.

They have air in them so when I open them while the sprinklers are on the banging stops.

So I let drain for a while but when I turned them off I was still getting banging.

I am having difficulty getting the air out of the hard water line.

Maybe I need a valve installed so I can bleed the air from the line.

Finally, I was able to run a few sprinkler stations without banging.

They will water again on Saturday Morning so I will see what happens.

How do I get air out of that hard water line.

This happened when I turned off the house main water shut off valve so I need to fix this so I can do this.

Easy in the house just open all faucets and flush toilets at highest point no issues.

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 Re: Air in my sprinkler lines, big thumping in house
Author: hj (AZ)

YOu would have to explain HOW the air would get into a pressurized line in the first place.

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