Cấp nước & Phân phốiCâu 40 / 360
A mechanical water hammer arrestor uses a sealed piston or bellows with a gas charge. Why is this preferred over an old-style capped air chamber?
a.It is cheaper only
b.It requires no fittings
c.Air chambers never work
d.The sealed gas charge does not become waterlogged over time, so it keeps functioning
Giải thích
A traditional capped air chamber eventually absorbs its trapped air into the water (waterlogs) and stops cushioning, while a sealed piston or bellows arrestor keeps its gas charge separated and continues to function. Cost, fittings, and the claim that air chambers never work are not the correct technical reason.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §609.10Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the essential difference between back-siphonage and backpressure backflow?
- A meter and service are being sized. The peak demand is 24 gpm at a required 20 psi residual. Available static street pressure is 55 psi, and the total pressure loss budget (meter, elevation, friction, fittings) is calculated at 40 psi. Is the design feasible?
- Which joining method is appropriate for Type L copper water tube?
- An unprotected submerged inlet exists where a hose lies in a mop bucket filled with dirty water, connected to a faucet under pressure. What type of hazard does this arrangement represent?
- When calculating developed length for water pipe sizing, what does developed length include?
- A dedicated fire sprinkler system without antifreeze or chemical additives is connected to the potable main. Which backflow protection is generally the minimum appropriate for this typically low-hazard connection?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-36 Plumbing Trade Examination · Quy trình kiểm tra