Water Hammer?

[mpire]

The water main is about a inch pipe that comes in from the street. Then it comes out to the sprinkler system.

I have the usual CPVC pipes for the hot water heater.

The sprinkler controller is right next to the water heater.

When I cycle through the sprinkler zones, I can see the water lines going into the water heater physically shake.

I assume its because the new sprinkler valves I put in recently are slamming shut.

I don't know if this is new or not, but the pipe has to go from the main all the way around the house to the other side, probably 80-100 feet to the sprinkler valves.

Do I need to be concerned about any of this?

Thanks!

 

[Defender Chassis]

Its relative. How bad do they shake? Do they make any noise?

 

[Defender Chassis]

You could make your own too.

Be forwarned, making your own by creating a high spot in the line, similar to an inverted drip leg, will only work for a limited time. Don't ask me how I know.

 

[VWandDodge]

Be forwarned, making your own by creating a high spot in the line, similar to an inverted drip leg, will only work for a limited time. Don't ask me how I know.

I'm going to ask because I've made my own on CPVC lines that have lasted for 15 years and not one problem.

 

[Charles (in GA)]

The water will absorb the air in the capped off vertical leg of the water hammer arrest-er, and when that happens, it is no longer effective. Another solution would be a 2 gal well tank (bladder type) tee'd into the system, near the valves.

Charles

 

[Falcon67]

The water will absorb the air in the capped off vertical leg of the water hammer arrest-er, and when that happens, it is no longer effective. Another solution would be a 2 gal well tank (bladder type) tee'd into the system, near the valves.

Charles

X2 on the small well tank - best arrestor on a sprinkler system and made for the job.

 

[Frank The Plumber]

Where you feed your sprinkler system you should have a valve. If you do not have a valve add one. After this valve you should in most cases on an irrigation system have a system drain. If not add one. After this system drain put a 3/4 female adaptor facing up. Put in a short ****** add a valve. Give yourself a bit of room height wise to play here.

To get a cushion you can try a few things, you could try a 24" long section of pipe with a cap. Its cheap. You could try a mechanical air chamber a bit spendy. You could try a 2 gallon pressure balance bladder that you would set the pressure of the bladder tank to the system pressure, best.

You will wear your solenoids faster and you will stress your piping system if you allow the hydraulic shock to continue. The solenoids just stop all of the water in motion instantly and mercilessly like a car wreck,this transfers all the force to the lines.

You may also look into fastening your piping system a bit better after putting in the air chamber shock arrestor.