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Converting demand: a building has an estimated 46 WSFU load served predominantly by flush tanks. Using a typical Hunter-curve conversion, the demand is about 30 gpm. If you must maintain roughly 8 fps maximum velocity, why can you not simply pick the smallest pipe that carries 30 gpm at any velocity?
a.Because gpm cannot be converted to velocity
b.Because smaller pipe always costs more
c.Because a pipe too small would exceed the velocity limit, causing noise, erosion, and water hammer
d.Because velocity has no effect on pipe life
Giải thích
Forcing 30 gpm through an undersized pipe raises velocity above the roughly 8 fps guideline, causing noise, erosion, and water hammer, so pipe size is limited by velocity as well as flow. gpm and velocity are directly related through pipe area, smaller pipe is not more expensive, and velocity strongly affects pipe life.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §610.0Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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