Đường ống gaCâu 241 / 360
A building is served by an elevated-pressure (2 psi) gas system. What component is required near each appliance?
a.A second gas meter at every appliance
b.A sediment trap that also reduces pressure
c.Nothing extra; appliances run fine on 2 psi
d.A line pressure regulator to step the 2 psi down to the appliance operating pressure
Giải thích
In a 2 psi (elevated-pressure) system, the smaller high-pressure piping must be stepped down by a line pressure regulator to the low pressure (inches of water column) each appliance needs. Without the regulator the appliance regulator would be overwhelmed and the burner would over-fire. The regulator is a separate device from the shutoff valve and sediment trap.
Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A sediment trap is generally NOT required at which of the following appliances?
- Which material is the traditional default choice for interior fuel gas piping in residential and light commercial work?
- A tankless natural gas water heater lists an input of 199,000 BTU/hr. Using 1,000 BTU per cubic foot, what gas demand must the branch supplying it be sized for?
- What is the typical operating (manifold) pressure for a standard residential propane (LP) appliance?
- Which statement about listed flexible appliance connectors is correct?
- A sizing table (0.5 psi drop, natural gas) shows that 3/4-inch schedule 40 pipe at a 40-foot run carries 170 cfh, and 1-inch pipe carries 320 cfh. A section must supply a 250,000 BTU/hr load over that 40-foot run. What is the smallest listed size that works?
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