General Plumbing Regulations Flashcards
7 cards from real Journeyman Plumbers Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 General Plumbing Regulations flashcards as text
Under IPC, which of the following venting methods allows a single vent pipe to serve multiple fixtures on the same horizontal branch?
Answer: Circuit venting
Circuit venting allows a single vent to serve multiple fixtures connected to a common horizontal drain branch.
What is the primary reason galvanized steel pipe is rarely used for new potable water installations today?
Answer: It corrodes internally, restricting flow and introducing rust into water over time
Galvanized steel pipe corrodes from the inside out over time, reducing diameter and introducing rust and scale into the water supply.
Under IPC, what is required when a plumbing vent pipe passes through a roof?
Answer: It must extend at least 6 inches above the roof surface
The IPC requires vent pipes to extend at least 6 inches above the roof to prevent blockage by snow or debris.
A plumber finds that an existing 4-inch cast iron drain is cracked and must be replaced with PVC. The transition coupling used between cast iron and PVC must be:
Answer: A listed mechanical (Fernco-type) transition coupling
A listed mechanical transition (shielded) coupling is required to join dissimilar pipe materials like cast iron and PVC.
Which of the following is the correct definition of 'drainage fixture units' (DFU)?
Answer: A unit of measure used to calculate the probable discharge load on a drainage system
Drainage fixture units (DFU) are a standardized unit used to estimate the probable drainage load that fixtures impose on a sanitary drainage system.
Under IPC, what is the maximum horizontal distance a fixture trap can be located from its vent (trap-to-vent distance) for a 2-inch trap arm?
Answer: 8 feet
For a 2-inch trap arm, the IPC allows a maximum horizontal distance of 8 feet from the trap weir to the vent.
Under IPC, when must a backwater valve be installed on a building drain?
Answer: When fixtures are located below the elevation of the next upstream manhole in the public sewer
The IPC requires a backwater valve when drainage fixtures are located below the upstream public sewer manhole elevation to prevent sewage backup.