I have to move my drain 2 feet in 2 places
1 for a freestanding tub and another for a linear drain
This of course require to cut both sewage lines, put a 45 on the lines and glue the new lines in place with ptrap
my permit said I have to have it under pressure for first inspection
Who do I pressure test just past the first glue joint(apx 2 feet) without testing the whole house

Thank you

Insert a test tee and use a screw-in balloon plug. Have the tee opening facing up. Replace the balloon after testing with a screw in plug.

5 PSI is what is required under most codes.
so you need some sort of gauge set up so you can put compressed air into the work and watch that the gauge doesn't lose any pressure.

I've been a plumber now for 12 years. never tested a drain with air.
always use water and try to get a 10 foot head.

in some cases where it's impossible to close off the system a running test is all I can do.

Some codes won't allow air testing plastic pipe.

no air test ??????

try doing new construction around northern new england.

call for a rough inspection during january.

schedule the inspector for wednesday. that wednesday the temperature is below zero and the only heat in the building is a couple of propane salamanders. no insulation in the building because it can't be done until after the plumber and electrician and framing inpections are done.

try hooking 5 garden hoses together to get water from a neighbor because the water service to the building can't be turned on or the well is not complete.

am i exaggerating ? HELL NO.

my point, 5 PSI air is the only option.

I just saw a youtube video of a piece of ABS pipe exploding from air pressure. Ok, it took I believe 455psi.

Here's from one jurisdiction...

"P2503.5.1 Rough plumbing
DWV systems shall be tested on completion of the rough piping installation by water or for piping systems other than plastic, by air with no evidence of leakage. Either test shall be applied to the drainage system in its entirety or in sections after rough piping has been installed, as follows:"

Then may be the only option is to beg a neighbor for use of his/her hose bibs for new construction.

What if the system is filled with water during the winter, waiting for the inspector to come, and there is no heat no insulation, and the inspector got delayed, and the system completely freezes overnight into cylinders of ice, who would be liable for it then?



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Packy I agree on water testing in the winter. That is why we use smoke tests now smoke with minimum of 1” water column