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 is the minimum slope required for a residential drain pipe to ensure proper drainage per the IPC/UPC?
Answer: 1/4 inch per foot
The International Plumbing Code requires a minimum slope of 1/4 inch per foot (2%) for drain lines 3 inches or less in diameter to ensure solids flow properly.
What does the acronym PEX stand for in plumbing?
Answer: Cross-Linked Polyethylene
PEX stands for Cross-Linked Polyethylene, a flexible plastic tubing widely used in residential water supply systems for its freeze resistance and ease of installation.
What is the purpose of a P-trap in a plumbing drain system?
Answer: To hold a water seal that prevents sewer gases from entering the building
A P-trap holds a water plug in its curved section that acts as a seal, blocking sewer gases from traveling back through the drain and into occupied spaces.
Which pipe material requires the use of solvent cement (glue) for joining?
Answer: PVC and CPVC pipe
PVC and CPVC pipes are joined using solvent cement, which chemically welds the plastic surfaces together to form a permanent, watertight bond.
What is the standard residential hot water temperature set point recommended by the US Department of Energy to balance scald prevention and Legionella control?
Answer: 120°F
120°F is the recommended water heater set point — it prevents most scalding incidents while being hot enough to inhibit Legionella bacteria growth for most residential applications.
What does 'water hammer' refer to in a plumbing system?
Answer: A pressure surge caused by the sudden stopping of flowing water
Water hammer is a pressure wave (hydraulic shock) that occurs when flowing water is suddenly stopped, such as when a fast-closing valve shuts, causing a loud banging noise and potentially damaging pipes.