Systems & Code第 48 / 110 题
An indirect waste pipe has an effective outlet opening of 3/4 in. The required air gap above the receptor flood-level rim is two times the effective opening. What is the minimum air gap?
a.3/4 in
b.1 in
c.3 in
d.1-1/2 in
解析
Air gap = 2 x effective opening = 2 x 3/4 in = 1-1/2 in. The two-times rule sets the vertical separation that prevents waste from siphoning back into the indirect-wasted equipment. Near a wall the multiplier increases to three times the opening, which would give 2-1/4 in here.
法律依据: UPC §807.0免费刷完整 110 道题库 — 无需注册。
同考点相关题目
- A water softener regenerates using 8 lb of salt per cubic foot of resin for a 3 cubic foot resin bed. How much salt is consumed per regeneration cycle?
- A water heater is installed in a garage where flammable vapors may be present. What installation requirement addresses ignition of those vapors?
- A key difference between the Uniform Plumbing Code and the International Plumbing Code affects where the building drain becomes the building sewer. Which statement correctly pairs the codes?
- A sewage ejector serving fixtures below the sewer must discharge upward and then into the gravity building drain. What fitting protects the pump from gravity backflow when it is off?
- A medical gas distribution system has a working pressure of 50 psi. The installation acceptance test is performed at 1.5 times the working pressure. What is the required test pressure?
- A thermostatic mixing valve blends 140 F stored water with 60 F cold water to deliver 110 F tempered water at a public lavatory. Using a mass balance, what fraction of the delivered flow must be the 140 F hot water?