Pipes pulsating (video)

[skydve76]

Why are my pipes doing this? I shut off all toilets, sprinkler, washer, and dishwasher supply lines. the only thing that fixed this is reducing the water pressure at the PRV.

My guage is bad (Always reading 90psi even when it is probably 10) so Im not sure how high it was. But its probably 60% of what it was and quite and smooth.

Ideas? Could my PRV be going bad, but adjusting it has fixed it temporarily?

Note I though it was caused by my hot water heater but whats happening is the pressure spikes are forcing water into it and causing that whooshing sound.

 

[WorthFlorida]

What kicks it off? Well or city water? Pressure tank? If city water is there an expansion tank? Well, pressure tank checked. Drained pressure set and refilled by the pump?

Since everything is closed off, what your hearing is a shock wave bouncing around from one end to the other. If you open a spigot, does it stop sooner?

It does seem the PRV is bad so I suspect it's city water.. Easy to rebuild.

 

[Sponsor]

 

[skydve76]

What kicks it off? Well or city water? Pressure tank? If city water is there an expansion tank? Well, pressure tank checked. Drained pressure set and refilled by the pump?

Since everything is closed off, what your hearing is a shock wave bouncing around from one end to the other. If you open a spigot, does it stop sooner?

It does seem the PRV is bad so I suspect it's city water.. Easy to rebuild.

Yes city water. Any water throughput causes it to pulsate.
Interesting things:
My pressure reads 90 psi. I tried 2 guages.
My volume is LOW. After I reduced the pressure, all it did is reduce volume and it seems static pressure is high. Its hard to take a shower, even a cold one is low volume. But the high pressure reading is driving me crazy.

I ordered a new valve, will try replacing this weekend. Mine is a discontinued model so I am going to replace with another one that is all metal. The new version of mine is an exposed rubber diaphram. NO way!!

Very odd issues. I hope it fixes it and thanks for your response.

 

[WorthFlorida]

Installing an expansion tank on the cold water side is almost mandatory for water heaters to maintain warranty if any left. It will help to reduce or eliminate the hammer. Acts like a shock absorber. They are not expensive and easy to add.

My sons house built in 1977. He moved in 2013 with a new water heater installed by the pervious owner. No issues to about a 18 months ago. Suddenly the T&P valve would open up during the day when no one was home or overnight. A little puddle of water were left behind from weeping, not gushing out. We installed an expansion tank and it took care of the problem. I do not remember the high pressure reading we got but it was over 90PSI. Why after all these years it started? I do not think it was the T&P valve. They do not just open at 150 PSI.

 

[skydve76]

Thanks, for the info, do you know how it is possible I have 90psi and low volume? Is this a sign of a bad PRT?
Her is a pic of my current PRT, I am going to use this one:

https://www.amazon.com/dp/B09C2GC394?psc=1&ref=ppx_yo2ov_dt_b_product_details

It looks to have both female and male threads. I want one that is all metal.

 

[skydve76]

Sucess! I ended up using a cheaper model as it was the same length as my original, the one imy hand I think is better but would require me to shorten the main line a little (cut then couple). Im going to hand on to it incase this cheaper one fails!