Water Hammer And Water Hammer Arrestors
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- Опубликовано: 26 июл 2020
- What are those loud noises coming from inside your walls? It's possible you're experiencing the effects of water hammer. This video will explain what water hammer is, how to prevent water hammer, and a quick demonstration of the water hammer phenomenon.
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A lot of people are confused about the result so we're going to explain it. The hammer effect occurs when there is a sudden rapid pressure rise in the pipes, resulting in a loud noise and potentially damaging the system. The main goal when using a hammer arrestor is to slow down the pressure buildup, rather then reduce the maximum pressure point. Water pressure spike gets absorbed by the piston inside of it, therefore softening the hit on your pipes. We hope that explained it, if you have any more questions- feel free to reply to this comment.
That doesn’t explain your video!! You should remove your video!!! You are confusing everyone that watches your video. It makes you look like a bunch of clowns!!!!
PEX Universe your explanation is clear but your video HAS TO BE DONE AGAIN. This is not an attack on you, these things happen and we fix them.
@@emilio8321 you don’t have to attack anyone like that. You can make your point but why like this? This only helps you feel better for a few seconds. If anything, you should remove your comment for being so rude and disrespectful. I feel for those living with you, your family must have it hard. You’re either a narcissist or a sociopath or just plainly an good ball trolling these types of videos. You may be a smart guy because I don’t know you but these types comments make you sound really ignorant to the rest of the populous. You are delusional, if you think this behavior is normal. If you think you are smart, there’s always someone else smarter than you. You don’t know everything. You may be good in this area but your ignorant in other areas. If you took a point or two from this video I then that’s great. If you didn’t like the video thumbs it down. Why be so disrespectful with your comments. I’m sure you’ll be reading this and you will be focus on the grammar and not the content. I’m not surprised because your comment says a lot about you. It’s best sometimes to keep your mouth shut so people don’t truly know you. In your case it’s best to do less typing and keep your thoughts to yourself. If you want to share your thoughts consider being more constructive. Good luck to your family and friends, if you gave anyone that have stock around. Remember it’s never to late to change and also remember change is good. You’re in my prayers, Emilio.
Would I need to use bother an arrester and a pressure regulator? It’s for my water drip irrigation for my garden bed.
@@stephenbrickwood1602 please stop attaching him, this makes me feel uncomfortable - I will call the cyber police on you
Actually it did shoot up nearly as far.
it wasnt as violent though. i think that's the point
He used a dinky one
No, the first time was 150psi, and the 2nd was only 145. 😅
The idea is correct, demonstration a bit short...
The potential energy stored in 150ft of line is way over the capacity of that little hammer arrestor. If there's not enough air to allow compression, demonstration doesn't work.
One of my water pipes makes loud knocking sound every few minutes that lasts for about a minute or so even when the water isn't running. I brought a plumber and he changed the water pressure regulator but that didn't solve the problem. I also bled the system but that didn't work either. Any suggestions?
Seems like the pressure gage should of been installed after the arrestor instead of before to show the drop in pressure. Or would it still show the same result?
Uhh, looking at the before and after I don't see much difference at all. Both times it pegs to 150 psi, then drops to ~55 psi with a little oscillation. Pretty easy to make and install a simple air chamber. Turn off your water supple at the valve.
Cut your copper/Pex pipe near the valve.
Insert a T fitting.
Add a 6-12" piece of pipe/Pex to the vertical side of the T fitting, and cap the top of that pipe.
That entire section is now full of air.
Turn on your water valve, and water will fill the horizontal run, however not much of the vertical pipe.
When the shock wave bounces back during water hammer, the water will compress the air in the vertical pipe, filling part of the vertical pipe with water, and thus disperse the shockwave.
Plumbers used to add these near most valves during install, especially the hot for some reason.
I just threw a large expansion tank on. The little copper arresters are useless.
Honest question.. how would you accomplish this if the pipe was vertical.
@@justins8768 keep going vertical past any horizontal turn. (unless you're sending water to heaven, then you're screwed.)
Agreed. The demonstration shows that the time to maximum pressure is longer with the arrestor; without the arrestor was very quick (~instantaneous) while with the arrestor was somewhat slower (~half a second). Doesn't seem like a lot but it makes a difference. Similar to auto crumple zones nowadays compared to old school solid frames that didn't give (crumple). Additionally, I believe the long run of PEX is also absorbing some of the pressure compared to if it were copper - I imagine a similar test with copper would show a higher maximum pressure. I understand that the problem with the simple air chambers you proposed is that over time the air gets absorbed by the water until there isn't an air chamber anymore which requires maintenance to drain the air chamber of water. The newer arrestors keep the air separate.
Will athermal expansion tank do the same think as a water hammer arrestor? Will the tank provide protection for the entire plumbing system in the house
What does it mean if you hear the knocking turning the water on too. After Installing arrestor the knocking is still there. Feels like loose pex behind wall
The pressure didn't change. Did you actually look at the pressure before posting this?
Hello Scott, please refer to our latest comment for a detailed explanation.
@@PEXUniverse Translated into a NO answer. This kid never checked his own video.
@@rickjames6948 that was rude
I have some water hammer issues but I can't get very close to the valve without making a hole in the wall. I can maybe get about 3-4 ft away to install an arrestor. I know you want them as close as possible. Does the distance have a large impact on effectiveness?
A simple rule of thumb is the closer the better, however that distance should not be concerning.
Dude are you blind? both went to 150 psi.
Where is the best place to install on of these?
Closet to the faucet?
Before our after the shut off valve?
A manufacturer called Watts says to install them as close to source of the shock as possible.
So that would be as close to the kitchen faucet or washing machine as possible .
.
WOW, a savings of 3 PSI drop. I want one...... LOL
I reckon that a AA accumulator is improperly sized for this application; therefore, having little affect on the inertia of the water in a system of that magnitude.
So why do my pipes make a noise when I shut the water off and it’s been off for 2-5 min. I hear the noise every20-30 seconds. Eventually it goes away. Is that still water hammer or
Possibly so! We recommend calling in a licensed professional to take a look
License pro You have a ghost 👻 in the house call man runnnn
can I just throw water hammer arrestors throughout my system to prevent damage?
As Dylan said in Visions of Johanna, “in this room the heat pipes just cough”.
"The country music station plays soft
,
But there's nothing, really nothing to turn off"
is this installed, on the main pipe?
yes
Will that stop the noise of the pipe no matter where it is ?
@@fredsalazar620 We'd recommend installing it as close to the valve / fixture as possible. Normally that is where the shockwave would occur.
PEX Universe Right on!
I used then on the washing machine and I had no change
He is using PEX plastic piping that is not rigid. This kind of piping can expand a little and already acts like a hammer arrestor. The results would have been more noticeable if he used solid copper piping.
If you've ever experienced this yourself please leave a comment and tell us about it!
Well explained I understand everything 👏
It’s more on my pex on cold water side
There are a lot of other ways to stop water hammer including using a similar length of pipe (12" or so long) with a cap,on the end. This should have been mentioned because it a lot less costly than your solution and works great!
155 psi to 145 psi HUGE difference
It was the exact same!?!? Wtf
Hello Travis, the Hammer arrestor is absorbing the shockwave, that means the "water hammer" impact will be gradually reduced although the water pressure spike will be about the same. We hope that explains it!
@@PEXUniverse then why did you specifically say the pressure was less?
@@PEXUniverse Air compression is what helps with your thought(pressure spike to 150psi). I challenge you to use 10 hammer arrestors in line and repeat experiment. My guess is you won't read 150psi spike anymore. The little arrestor used has almost no impact to your demonstration.
Radu 81 f u
Pez universe : u are fucking amazing thanks for the video fucking haters
You should redo this video
Dude looks like Richard Ramirez, aka The Nightstalker. That's not a compliment.
Way cheaper to make a dead leg in the pipe using a tee and a vertical 9 inch long straight pipe with a cap. Works the same and never wears out like your water hammer preventer. PEACE !!!!!
It'll get water logged eventually, but can be emptied if maintained.
Unsurprisingly that tiny arrestor sucks.
Water Hammer Resister... Uh I mean Arrestor
He demonstrates the phenomenon, but doesn't demonstrate a useful solution nor does he suggest where in a system a hammer arrestor should be inserted.