Irrigation : Water hammer

Dolby

Dolby

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I've recently installed an irrigation system that comes from my main pipe.

Problem is that when the system comes on, I get a clunking sound/knocking sound. I'll try get a recording tonight - but Google comes up with water hammer (below). Though, mine happens when the system goes on (not off). Also, seems to do the 1st time I use it in the day ... not subsequent.

Is it a hammer?
What else could it be?

Only happens when the irrigation was installed.

So it’s perplexing when you suddenly hear banging.That sound is a common plumbing problem called a water hammer, and it’s caused by an increase in pressure when a faucet, valve or water appliance is shut off. The water looks for a place to go as it changes direction, and it ultimately bangs against the pipe walls or the shut-off valve in your water system, making a distinct (and alarming) pounding noise
 
Thanks spiff.

And in irrigation - how would I bleed out air?
How does air get in the first place?
 
Not related to irrigation but definitely water hammer. If anyone had an issue like mine, explained below, please share your solution.
House is about 10 years old.
Banging sounds in pipes when mixers inside the house are closed (not all mixers but most of them, mainly on hot water side). Carrying on for years but got louder recently.
Recently had my geyser replaced and the 400kpa pressure valve outside also replaced. The banging got worse afterwards. Called the plumber back. he could not find the fault. All pipes in ceiling are secured.
Eventually he found a non return valve in the ceiling and removed it. He said if the pressure valve is near the geyser in the ceiling then the non return valve is needed. But since our pressure valve is outside on the main water supply line then it is not needed.
The water hammers disappeared........for a day. Its back with a bang.
Could the mixers be faulty? If I replace mixers will the problem go away?
 
first secure the pipes so they don't bounce around.

if that does not help try the water hammer arrestor

HOME DZINE Home DIY | How to prevent water hammer

Do you have banging pipes - or water hammer? A banging noise in the water pipes normally occurs when the water is turned off too quickly, especially on valve-type taps and fittings. There still seems to be some confusion as to this topic, so I decided to find as much information as possible on...
www.home-dzine.co.za www.home-dzine.co.za

Mini-rester Water Hammer Arrester 3/8"od Stop | WantItAll

Brand: Broan, Model: 660-TR1, Categories: Appliances
www.wantitall.co.za www.wantitall.co.za

www.wantitall.co.za

SharkBite 1/2 Inch Residential Water Hammer Arrestor, Push to Connect Brass Plumbing Fittings, PEX Pipe, Copper, CPVC, PE-RT, HDPE, 22630LF

SharkBite 1/2 Inch Residential Water Hammer Arrestor, Push to Connect Brass Plumbing Fittings, PEX Pipe, Copper, CPVC, PE-RT, HDPE, 22630LF
www.wantitall.co.za www.wantitall.co.za
 
i also have hammers banging away.
i will be sitting here in my lounge minding my own business and then hear the hammers for 3 seconds coming from bathroom area

sometimes i am sitting on the crapper and it starts up, cleanses my bowels very quickly indeed

the thing is this never use to happen until my neighbour in the flat next door re did his bathroom about 5 or 6 years ago and added a solar geyser.

neighbour has been gone for 7 days now and i still hear the banging every now and then, but only during the daytime, i wonder if its his geyser causing it :unsure:
 
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