2018 International Plumbing Code (IPC) Study Companion Flashcards

Comprehensive review flashcards covering IPC General Regulations, Fixtures, Water Heaters, Water Supply and Distribution, Sanitary Drainage, Indirect/Special Waste, Vents, Traps/Interceptors, and Storm Drainage based on the 2018 IPC Study Companion.

When there is a conflict between the requirements of the code and the manufacturer's installation instructions, which requirements apply?

The manufacturer's installation instructions apply.

What is the minimum thickness required for sheathing or wrapping used for corrosion protection of pipes?

Not less than 0.008 inch (0.203 mm) thick.

When steel shield plates are required to protect concealed piping against physical damage, what is their minimum required thickness?

Not less than 0.0575 inch (1.46 mm) thick.

When rock is encountered while excavating a trench for underground piping, to what depth must the rock be removed below the bottom of the pipe?

At least 6 inches below the bottom of the pipe.

What is the maximum interval for supporting 1/2-inch CPVC water pipe installed horizontally?

3 feet.

When performing an air test on cast iron DWV piping at a pressure of 5 psi, what is the maximum increment permitted on the test gauge?

0.10 psi increments.

What minimum head of water is required when conducting a water test on a building drain?

A 10-foot head of water.

What minimum slope must condensate piping maintain?

Not less than 1 percent.

For an employee toilet room, where must the required lavatory be located relative to the required water closet?

In the same room as the water closet.

What maximum water discharge temperature is allowed for bidets equipped with ASSE 1070 or CSA B125.3 devices?

110 degrees Fahrenheit.

What is the maximum allowable water temperature setting supplied by an individual shower valve?

120°F.

What temperature range of water must be delivered from public hand-washing lavatories?

Between 85°F and 110°F.

What device is required on a bottom-fed water heater to prevent siphonage of the tank?

A vacuum relief valve.

Unless the tank's working pressure is lower, what is the maximum pressure setting permitted for a temperature and pressure relief valve?

150 psi.

What minimum insulation value is required for an unfired hot water storage tank?

Not less than R-12.5 (h·ft²·°F)/Btu.

What is the maximum distance a water heater installed in an attic can be located from the access opening?

20 feet (6.096 m).

What is the maximum allowable water pressure permitted on a water distribution system before a pressure reducing valve is required?

80 psi.

What maximum lead content is permitted for water supply pipe and fittings supplying water for drinking or cooking?

0.25 percent.

What horizontal distance must separate a water service pipe from a building sewer in undisturbed or compacted earth?

A minimum of 5 feet.

What color is required to identify nonpotable water distribution piping?

Purple.

How high must a barometric loop extend vertically to prevent backflow?

35 feet.

What is the minimum required distance between a private water well and a septic tank?

50 feet.

What minimum concentration of chlorine is required for 24 hours to disinfect a potable water supply system?

50 parts per million.

What is the minimum required slope for a 4-inch horizontal drainage pipe?

1/8 inch per foot.

What are the minimum required dimensions for a sewage sump pit?

18 inches in diameter and 24 inches deep.

What is the maximum spacing allowed between cleanouts on horizontal drainage piping?

100 feet.

How is a food-preparation sink required to discharge to the sanitary drainage system?

Indirectly through an air gap.

What minimum air gap is required between an indirect waste pipe and the flood level rim of a waste receptor?

A minimum of 2 times the effective opening of the indirect waste pipe.

What is the main purpose of venting in a plumbing system?

Trap seal protection.

What is the minimum required height above roof level for a vent terminal on a roof that serves as a sun deck?

7 feet.

How many fixtures does a common vent provide venting for?

Two fixtures.

What minimum distance above insulation materials must an air admittance valve be installed?

6 inches.

What is the maximum allowable retention time for untreated gray water in a collection reservoir?

24 hours.

What minimum water seal depth is required for an oil separator below the invert of the discharging drain?

24 inches.

In nonpotable rainwater collection systems, how far above the bottom of the tank must storage tank outlets be located?

At least 4 inches.