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Home water pressure?

[486] said:
why would a city water system have an expansion tank?
makes no sense, that's what the water tower down the road does
Click to expand...

I had to do it on my last house or the new tank style water heater would blow the high pressure valve every night. Installed the expansion tank and no more issues. Also helped with water hammer.
 
:flipoff2:
Shit when I ran irrigation at sonoma development, the stattic pressure was 135 on the low side. I could flow +100k gallons hr and kill the toilets everywhere...
Shake the walls was a joke at the treatment plant....:stirthepot:
 
KDXSR5 said:
I had to do it on my last house or the new tank style water heater would blow the high pressure valve every night. Installed the expansion tank and no more issues. Also helped with water hammer.
Click to expand...
makes me think there's a check valve somewhere in the line to your house
 
[486] said:
why would a city water system have an expansion tank?
makes no sense, that's what the water tower down the road does
Click to expand...
Backflow valves, if the water in the lines warms up, it has no way to release pressure back into the city water system. In house pressure goes up till somebody cracks a valve.
 
The PRV can't relieve pressure built by the water heater expanding water on the service side. That's why the new bladder fixed it.

Utilities typically fill the water towers overnight and let them drain during the day for several reasons. Depending on where you are on the system, that can cause overnight spikes in pressure. It can cause huge water hammers if they don't shut down correctly. The PRV should mostly protect against that.
 
Do all water heaters need to have an expansion tank? Mine doesn't.
 
BIG-O said:
Do all water heaters need to have an expansion tank? Mine doesn't.
Click to expand...
Are you on a well or on water supplied by the utility co? Most times on a well you don't need a tank on the water heater as the tank for the well is not at max pressure and can absorb the extra pressure as the water heater heats up and build extra pressure. When on water from the utility, you don't have the tank on the pump so you need one at the tank to absorb that extra pressure.
 
I get water hammer sometimes. :homer:
Probably need to check this. :lmao:
 
junkytj said:
The PRV can't relieve pressure built by the water heater expanding water on the service side. That's why the new bladder fixed it.

Utilities typically fill the water towers overnight and let them drain during the day for several reasons. Depending on where you are on the system, that can cause overnight spikes in pressure. It can cause huge water hammers if they don't shut down correctly. The PRV should mostly protect against that.
Click to expand...
I didn't realize this before, because my house on city water doesn't have a rpz back flow preventer because I'm also on city sewer.
 
When I was a kid my parents neighbor complained the pressure was too high.

So they reduced it down to the minimum. It’s awful. You could barely take two showers at a time.

So don’t call the utility to come do that.

A pressure reducing valve after the meter is the way.

My guess is demand is lower at night and the water tanks refill and the pressure rises before it hits the threshold for the city’s pressure reducing system and returns to normal.
 
JunkCJ6 said:
Are you on a well or on water supplied by the utility co? Most times on a well you don't need a tank on the water heater as the tank for the well is not at max pressure and can absorb the extra pressure as the water heater heats up and build extra pressure. When on water from the utility, you don't have the tank on the pump so you need one at the tank to absorb that extra pressure.
Click to expand...
Thanks. I am pretty close to the water plant. I've checked the pressure 60#. No prv.
 
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