Systems & Code第 41 / 110 题
A lawn irrigation system with chemical injection is connected to a potable supply. This is classified as a high health hazard under backpressure and backsiphonage conditions. Which backflow assembly is required?
a.Reduced-pressure principle assembly
b.Atmospheric vacuum breaker
c.Dual check valve
d.Hose-bibb vacuum breaker
解析
Chemical injection creates a high health hazard and can occur under backpressure, so a reduced-pressure principle assembly is required because it protects against both backpressure and backsiphonage of a health hazard. An atmospheric vacuum breaker only protects against backsiphonage and cannot be under continuous pressure. Dual checks are for low-hazard applications only.
法律依据: UPC §603.0免费刷完整 110 道题库 — 无需注册。
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