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Old 03-20-2013, 12:05 AM   #46
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Brand new water heater TPR valve spraying


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Isn't that in the code book somewhere......
Yep. Problem is, there was ORIGINALLY a tank type water heater there with a thermal expansion tank that was most likely doing the job that a hammer arrestor would. Somebody changed the tank out to a pair of tankless, and shortly thereafter the t&p started leaking.



Let's just say that I came in on the end of all this. Nothing installed by me except the hammer arrestors.

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Old 03-20-2013, 01:58 AM   #47
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I was just doing some reading on pressure reducing valves, backflow preventers and the difference between them and came up with a question.

Since our city was pressure is so high (160psi) and I have our PRV set @70psi, is it essentially also serving as a BFP since the TP valve on the water heater should kick open before our water pressure ever gets high enough to flow back into the city's supply?
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Old 03-20-2013, 10:08 AM   #48
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Yes. 10char.
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Old 03-20-2013, 10:42 AM   #49
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I was just doing some reading on pressure reducing valves, backflow preventers and the difference between them and came up with a question.

Since our city was pressure is so high (160psi) and I have our PRV set @70psi, is it essentially also serving as a BFP since the TP valve on the water heater should kick open before our water pressure ever gets high enough to flow back into the city's supply?
Not when dealing with back siphon.
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Old 03-20-2013, 10:26 PM   #50
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Well, technically the T&P valve is acting as the back pressure protection, not the PRV. The PRV is doing nothing in that scenario. If the bypass in the P.R.V. is open, the 70 + PSI that would be built in the system but you could never overcome the city pressure without a properly operating T&P relieving the system.


With all that said, in a real world situation, your municipality is going to ask for a back flow preventer, and more than likely something above and beyond whatever the minimum is.

Heck, the guys here required us to put in a 1-1/4" R.P. device because the store we were plumbing had a pharmacy in it.


WTF is the hazard there? R.P. is for back pressure. There are no pumping devices in a pharmacy. /rant
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Old 03-21-2013, 12:32 AM   #51
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I went to Lowes today looking for water hammer arrestors. Unfortunately they only had one kind and it was copper. They were about $11/ea so I pulled my phone out and looked on Amazon to see what they had. I found some CPVC ones for about $8/ea so I ordered 2 of them. I'm not against copper but I favor cementing CPVC pipes together vs. sweating copper...plus its cheaper

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