Fixtures & Water HeatersQuestion 67 of 120
A temperature and pressure relief valve has a 3/4 inch outlet. Which discharge piping arrangement is acceptable?
a.1/2 inch copper reduced at the valve and terminating 30 inches above the floor
b.3/4 inch pipe running by gravity to terminate 8 inches above the floor with a plain end
c.3/4 inch pipe with a ball valve installed for service isolation
d.3/4 inch pipe with a threaded cap installed on the terminal end
Explanation
Discharge piping must be full size of the valve outlet with no reduction, must drain by gravity, must have no valve in the line, and must terminate between 6 and 24 inches above the ground or an approved receptor with no threads on the end. The 1/2 inch option reduces the pipe and terminates too high, the ball valve option installs a prohibited shutoff, and the threaded cap option both threads the end and blocks discharge entirely.
Law Reference: IPC §504.6Practice all 120 questions free — no signup required.
Related questions on this topic
- Under the International Plumbing Code, what is the minimum clear space required in front of a water closet, measured from the front edge of the fixture to any wall or obstruction?
- A building owner replaces 40 old 3.5 gpf water closets with 1.28 gpf high efficiency models. If the fixtures are flushed a combined total of 2,000 times per day, how much water is saved per day?
- A storage type water heater is being installed. Which device must be provided on the tank to protect against both excessive temperature and excessive pressure?
- A 50 gallon water heater is installed in the attic above a finished ceiling. A drain pan is required. What is the minimum size of the pan drain line?
- A gas fired water heater is installed in a residential garage in a seismic zone. It must be strapped in two places. Where must the lower strap be located relative to the heater's controls?
- The same gas water heater is installed in that garage on a concrete slab. What is the minimum height that the source of ignition must be elevated above the garage floor?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Plumber Licensing Exam (UPC/IPC-based) · How we review