Pipefitting and Plumbing Flashcards
6 cards from real Other Skilled Trades practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pipefitting and Plumbing flashcards as text
What type of fitting is used to join copper pipe using heat?
Answer: Sweat (solder) fitting
Sweat fittings (also called solder fittings) are the traditional method for joining copper pipe — the joint is heated with a torch and solder is drawn into the fitting by capillary action.
What is the function of a pressure relief valve (PRV) on a water heater?
Answer: To relieve excess pressure or temperature to prevent tank explosion
The T&P (temperature and pressure) relief valve opens automatically if pressure or temperature in the water heater exceeds safe limits, venting water/steam to prevent a catastrophic tank failure.
What is the difference between black iron pipe and galvanized pipe in plumbing?
Answer: Black iron has no zinc coating and is used for gas; galvanized is zinc-coated and used for water supply
Black iron pipe has no protective coating and is used for gas lines, while galvanized pipe is coated with zinc for corrosion resistance and is used for water supply (though rarely in new construction).
How many fixture units does a standard toilet contribute to a building drain system per the IPC?
Answer: 4 fixture units
Per the International Plumbing Code, a residential toilet contributes 4 drainage fixture units (DFU) to the drain system for sizing purposes.
What is a 'union' fitting used for in a piping system?
Answer: To allow a section of pipe to be disconnected and reconnected without cutting the pipe
A union fitting allows two pipe sections to be easily separated and reconnected without cutting, making it essential for equipment that may need future servicing or removal.
What test is performed on a newly installed DWV (drain-waste-vent) system to check for leaks before closing walls?
Answer: Air pressure test or water test (ball test)
The standard DWV rough-in test involves plugging all openings and filling the system with water (or pressurizing with air) to verify there are no leaks before walls are closed.