FREE IPC Compliance and Plumbing Systems Questions and Answers
Which of the following types of fixtures can be served by a combination waste and vent system?
Explanation:
Combination-waste-and-vent (CWV) systems do not require independent vents on all fixtures. Instead of a vertical vent the fixtures approved for a CWV installation are installed with oversized drains. Due to the larger drain diameter the fixture obtains the needed air for drainage in the top section of the oversized piping. Urinals, toilets, and bidets are not allowed to be installed on CWV systems.
What will result when a 4-inch pipe is reduced in size in the direction of the flow?
Explanation:
At the reduction point, because of the direction of flow, waste can build up which will result in piping system blockage.
Piping for building drains and horizontal drainage branches requires the installation of cleanouts. Spacing for these cleanouts is determined by the diameter of the drain and other factors. In this scenario, the drain pipe diameter is three inches. This drain has a running length of 40 feet. During this run the pipe takes one 90-degree turn and one 45-degree turn. How many cleanouts are required for this installation?
Explanation:
Under the IPC, a cleanout is needed for every change of direction exceeding 45 degrees. Also, when there is more than one change of direction in a run of pipe, there needs to be a cleanout for every 40 feet of developed length. Using these standards, we need 1 cleanout for the 90-degree turn and 1 cleanout for the 40 feet of developed length.
The provisions for licensing are determined by which of the following:
Explanation:
The authority having jurisdiction determines the provisions for licensing. State Plumbing Boards determine requirements and provide testing of qualified applicants to become licensed. Plumbing inspectors enforce codes adopted by the AHJ.
What is the typical amount of grade required per liner foot on a household drainage pipe?
Explanation:
The amount of grade, also referred to as pitch or fall, for a drain pipe is determined by the size of the drain pipe. Master plumbers and other design professionals establish these elements of a plumbing system based on the minimum standards required by local code requirements. As a general rule of thumb, the proper amount of grade for a drain up to 4 inches in diameter is .25 inches per liner foot.
One trap arm may serve a total of how many P-traps?
Explanation:
Not more than one trap is permitted on a trap arm.
You are connecting two back-to-back lavatories, two urinals and two water closets to one horizontal branch. What are the maximum number of fixtures that can be connected to a horizontal branch?
Explanation:
The plumbing code allows a maximum of eight fixture connections to a horizontal branch drain. This is also called a circuit vent.
The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is __________________.
"Explanation:
The minimum vertical distance from the bottom of an indirect drain line to its receptors flood rim is 1".
Gas piping installed in a laundry chute ____________.
Explanation:
Gas piping is not allowed to be installed in laundry chutes, dumbwaiters, air-circulating ducts, or elevators. The chutes, shafts, and ducts can transport gas to various locations in a building if a leak should occur. Therefore, it is inappropriate to install gas piping in a location that could distribute gas beyond the location of the leak.
A plumbing permit is required for the replacement of which of the following?
Explanation:
A plumbing permit is not needed for the direct replacement of any plumbing fixture, except for a water heater. However, if a fixture location is changed, a permit is required. In other words, you can remove a toilet and replace it with a new one without the need for a permit. But, if you move the closest flange in any way, a permit is required. This is true for all plumbing fixtures.
Flux can only be used in the brazing process when:
Explanation:
Flux may only be used to braze dissimilar metals.