Đường ống gaCâu 239 / 360
Which material is the traditional default choice for interior fuel gas piping in residential and light commercial work?
a.PVC plastic pipe
b.Black (steel) pipe with malleable iron or steel fittings
c.Type M copper for all gases
d.Cast iron soil pipe
Giải thích
Black steel pipe with threaded malleable-iron or steel fittings is the traditional workhorse for interior gas distribution. PVC and other thermoplastics are used only underground where listed for gas, not for interior aboveground piping. Cast iron soil pipe is a drainage material and is not approved for fuel gas.
Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A single gas main serves a 40,000 BTU/hr water heater, a 100,000 BTU/hr furnace, and a 65,000 BTU/hr range. What total connected load must the main be sized to carry?
- What is the function of a gas pressure regulator in a piping system?
- A sediment trap is generally NOT required at which of the following appliances?
- 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?
- A building is served by an elevated-pressure (2 psi) gas system. What component is required near each appliance?
- What is the typical operating (manifold) pressure for a standard residential propane (LP) appliance?
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