Sounds like the gas trap test. This is copied from the 2000 international
building codes.


P2503.5.2 Finished plumbing. After the plumbing fixtures

have been set and their traps filled with water, their connections

shall be tested and proved gas tight and/or water tight

as follows:

1. Water tightness. Each fixture shall be filled and then

drained. Traps and fixture connections shall be

proven water tight by visual inspection.

2. Gas tightness. When required by the local administrative

authority, a final test for gas tightness of the DWV

system shall be made by the smoke or peppermint test

as follows:

2.1. Smoke test. Introduce a pungent, thick smoke

into the system. When the smoke appears at

vent terminals, such terminals shall be sealed

and a pressure equivalent to a 1-inch water

column (249 Pa) shall be applied and maintained

for the period of inspection.

2.2. Peppermint test. Introduce 2 ounces (59 mL)

of oil of peppermint into the system. Add 10

quarts (9464 mL) of ho****er and seal all vent

terminals. The odor of peppermint shall not be

detected at any trap or other point in the system.


--
Steve Barker



wrote in message
ups.com...
I'm installing a half-bath (toilet, sink) on my second floor. I'm doing
the work myself. Right after the rough-in was finished, the city
inspector came in to inspect. At that point, I had to perform an air
pressure test on the new lines. It passed.

After I am done with the rest of the project (i.e. with sink and toilet
in place and hooked up), the inspector will come back to have me
perform a SECOND test. This second test will also be an air pressure
test, but will also involve putting a tube down into the trap of the
toilet.

Anyhow, can anyone fill me in on the details of this test? I'm not
really confident that I know what I'm supposed to do. For instance, if
the sink is installed, where do I hook up the pressure gauge (the gauge
mechanism is also is where I pump the air into the system)? What is
this tube going into the toilet trap business? What is being tested
with this test?

Any help would be much appreciated.

Thanks,

Tim F
Minneapolis, MN