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Pressure testing pex question????????
- Thread starter matt60j
- Start date
5wndwcpe
Well-known member
65psi is fine for a test. What you need to watch for is how much it drops in a given period. This time of year, I wouldn't sweat a 3-5lb. drop overnite (temp. related).
I would test it for a 24 hr period minimum.
I would test it for a 24 hr period minimum.
rasit
Well-known member
You're good. The stamped rating on the tubing indicates what it is rated to. Meaning you could use it at 100psi all day long. The tubing is probably capable of testing at 150-200psi however there is no reason for you to go much higher than your normal operating pressure. Most city water systems operate at less than 70psi. Well pumps are normally set to cut-off at either 40psi or 60psi. Fifteen minutes with zero pressure drop is plenty of time on small tubing for test duration. It's important to note these ratings are hydrostatic pressure, not air pressure.
tigmusky
Well-known member
You're good. The stamped rating on the tubing indicates what it is rated to. Meaning you could use it at 100psi all day long. The tubing is probably capable of testing at 150-200psi however there is no reason for you to go much higher than your normal operating pressure. Most city water systems operate at less than 70psi. Well pumps are normally set to cut-off at either 40psi or 60psi. Fifteen minutes with zero pressure drop is plenty of time on small tubing for test duration. It's important to note these ratings are hydrostatic pressure, not air pressure.
what he said.... right on
Daye
Derek Clarkin
New member
- Joined
- Oct 27, 2009
- Messages
- 2
30psi for 30min is all i had to do.
jeff5295
Well-known member
I'm making the assumption that you're testing the pex for use in a concrete slab? If not, you can ignore the rest of my note.
If so, I left mine pressurized with the gage visible for the concrete guy to see while he poured the slab (I was not present for the pour).
If you're having someone else pour your concrete, point out the gage and the current pressure. Make sure he realizes it's holding pressure now and that you expect it to still be holding pressure when he is finished.
Both contractors who did my two shops wanted me to leave the system pressurized. They kept an eye on it during the pour. They said if a pressure drop was noticed, they knew there was a problem and they'd locate and isolate the leak.
You shouldn't have anything to worry about as pex is pretty tough stuff and you really have to try hard to damage it. Keeping it pressurized during the pour is just a good precaution and provides peace of mind. If a careless contractor happens to cut a tube when it's not pressurized, you won't know until it's too late.
If so, I left mine pressurized with the gage visible for the concrete guy to see while he poured the slab (I was not present for the pour).
If you're having someone else pour your concrete, point out the gage and the current pressure. Make sure he realizes it's holding pressure now and that you expect it to still be holding pressure when he is finished.
Both contractors who did my two shops wanted me to leave the system pressurized. They kept an eye on it during the pour. They said if a pressure drop was noticed, they knew there was a problem and they'd locate and isolate the leak.
You shouldn't have anything to worry about as pex is pretty tough stuff and you really have to try hard to damage it. Keeping it pressurized during the pour is just a good precaution and provides peace of mind. If a careless contractor happens to cut a tube when it's not pressurized, you won't know until it's too late.
6768rogues
Banned
I go with maximum working pressure for 2 hours.