ICC G24 Master Plumber Exam (2018 IPC)

Per the Section 202 definition, the water service pipe runs from the water main or other potable source (or from the meter only where the meter is at the public right of way) to the building's water distribution system, so where the meter is set inside the building the service pipe runs all the way from the main to the distribution system.

A stack vent is the extension of a soil or waste stack above the highest horizontal drain connected to that stack, while a vent stack is a vertical vent pipe installed primarily to provide circulation of air to and from the drainage system.

Horizontal pipe is any pipe or fitting making an angle of less than 45 degrees with a horizontal plane; vertical pipe makes an angle of 45 degrees or more (so 40 degrees is horizontal pipe).

An appurtenance is an adjunct to the basic piping system and fixtures that demands no additional water supply and adds no discharge load to a fixture or the drainage system; devices dependent on energized components are plumbing appliances.

Full-open valves are required at locations such as the discharge side of every water meter, the water supply pipe to every water heater, the entrance to the structure and the base of every water riser (in occupancies other than multiple-family residential two stories or less and one- and two-family dwellings), while shutoff valves are the valves required at fixture supplies.

Section 1002.3 prohibits S-traps with no exception, while drum traps are prohibited except where used as solids interceptors or serving chemical waste systems.

Potable water-supplied trap seal primer valves conform to ASSE 1018 and waste water-supplied trap primer devices to ASSE 1044, whereas barrier-type floor drain trap seal protection devices conform to ASSE 1072.

When testing the whole system, all openings are tightly closed except the highest and the system is filled to the point of overflow; when testing in sections, each section includes not less than the upper 10 feet of the preceding section so no joint except the uppermost 10 feet is tested at less than a 10-foot head — both held not less than 15 minutes.

The water test uses a 10-foot head (sections) or fill to overflow (entire system), while the air test forces air in until a uniform gauge pressure of 5 psi or a pressure balancing a 10-inch mercury column is reached; both are held not less than 15 minutes, and plastic piping may not be air tested.

Gravity grease interceptor capacity is peak drain flow in gpm multiplied by a 30-minute retention time, while an automatic grease removal device is sized to pretreat the measured or calculated flows of all connected fixtures or equipment.

Urinals shall not be substituted for more than 67 percent of required water closets in assembly and educational occupancies, and not more than 50 percent in all other occupancies.

Under Section 102.1 the specific requirement governs over a conflicting general requirement, whereas where different sections specify different materials, methods of construction or other requirements, the most restrictive governs.

In malls the path of travel to required public and employee toilet facilities shall not exceed 300 feet from the main entrance of any store or tenant space (and facilities not more than one story above or below), while Section 403.3.3 permits up to 500 feet in occupancies other than malls.