Water Supply Systems Flashcards
6 cards from real Plumbing practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Water Supply Systems flashcards as text
What is the minimum water pressure required at a residential fixture per the IPC?
Answer: 20 psi
The IPC requires a minimum static water pressure of 20 psi at every plumbing fixture to ensure adequate flow for proper operation.
What is the maximum water pressure allowed at a residential service entrance without a pressure reducing valve (PRV)?
Answer: 80 psi
Water pressure exceeding 80 psi at the service entrance requires a pressure reducing valve (PRV) to protect the plumbing system and appliances.
What device is required to prevent backflow where a hose bib connects to a garden hose?
Answer: Vacuum breaker
A vacuum breaker (anti-siphon device) is required at hose bibbs to prevent contaminated water from being siphoned back into the potable water supply.
What is the purpose of a pressure reducing valve (PRV) in a residential plumbing system?
Answer: To reduce high incoming water pressure to a safe level
A PRV reduces high municipal water pressure to a safe operating pressure (typically 50-60 psi) to protect fixtures, appliances, and pipes.
Which type of water heater heats water only when it is needed, without a storage tank?
Answer: Tankless (on-demand) water heater
A tankless (on-demand) water heater heats water directly as it flows through the unit, eliminating standby heat loss associated with storage tanks.
What is 'water hammer' and what device prevents it?
Answer: Pressure spike from sudden valve closure; prevented by a water hammer arrestor
Water hammer is a pressure surge or shock wave caused by sudden valve closure, and a water hammer arrestor absorbs the shockwave to protect pipes and fittings.