Plumbing System Design Flashcards
7 cards from real Master Plumber 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 Plumbing System Design flashcards as text
In a multi-zone hydronic heating system, a primary-secondary pumping arrangement is used primarily to accomplish which design goal?
Answer: Allow each zone to operate at different flow rates without affecting the primary loop
Primary-secondary piping decouples zone flow rates from the primary loop, allowing each zone's circulator to vary flow independently without hydraulic interference.
Which condition requires an engineered design rather than the standard prescriptive tables when using the IPC for drain, waste, and vent sizing?
Answer: A system that combines sanitary and storm drainage
Combining sanitary and storm drainage in the same piping requires a special and engineered design with specific authority having jurisdiction (AHJ) approval.
What is the minimum distance a potable water supply pipe must be separated horizontally from a sewer line when they run parallel, per most codes?
Answer: 10 feet
Most codes, including the IPC, require a minimum 10-foot horizontal separation between parallel potable water lines and sewer lines to prevent contamination.
A sanitary sump ejector system is required in which scenario?
Answer: When fixtures are located below the upstream manhole cover elevation of the public sewer
Sewage ejector pumps are required when fixture drains are below the elevation where gravity flow to the public sewer is impossible.
In medical gas system design, a zone valve box must be located where relative to the area it serves?
Answer: Outside the patient care area in the corridor
NFPA 99 requires zone valves to be located outside the patient care area (typically in the corridor) so staff can shut off gas without entering a hazardous area.
When calculating the water demand for a building using the Hunter's Curve method, what is the design demand in GPM for a system with 240 fixture units (all private use)?
Answer: Approximately 48 GPM
Hunter's Curve for 240 private-use fixture units yields approximately 48 GPM of probable simultaneous demand.
Which type of pipe joint is NOT permitted for use on a natural gas supply line inside a building per most code requirements?
Answer: Compression fittings (flare or sleeve type)
Compression-type mechanical fittings (non-flare sleeve type) are generally prohibited for interior gas piping due to potential for loosening and leaks.