Systems & CodePregunta 109 de 110
An air gap at a lavatory faucet must be maintained above the flood-level rim. If the effective opening of the faucet is 1/2 in and the outlet is near a single wall, the required gap is three times the opening. What is the minimum air gap?
a.1-1/2 in
b.1 in
c.2 in
d.3 in
Explicación
Near a single wall the multiplier is three times the effective opening, so 3 x 1/2 in = 1-1/2 in. Away from walls the standard multiplier is two times the opening, but a nearby wall disrupts the free fall of air and requires the larger gap. The air gap is the most reliable backflow protection because it is a fixed physical break.
Referencia Legal: UPC §603.4.6Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- An oil-water separator serves three garage floor drains each rated at 20 gpm. The code allows sizing at 75 percent of the total connected flow for diversity. What design flow sizes the separator?
- A laboratory discharges 10 gpm of acid waste that must be diluted with water at a 5-to-1 ratio (water to acid waste) before it enters the neutralizing tank. How much dilution water is required?
- An air admittance valve (AAV) is used to vent an island fixture. Which condition must be met for the AAV to be acceptable?
- A boiler feed with chemical treatment connects to potable water. This is a high-hazard connection. Which assembly protects the potable supply against backpressure from the pressurized boiler?
- A single-family residence has an underground lawn sprinkler system with no chemical injection and no downstream pressure. This is a low-hazard, backsiphonage-only condition. Which is the minimum acceptable backflow device?
- A water heater relief-valve discharge, softener drain, and condensate line all terminate at the same floor-level receptor. What must be true of the receptor and each connection?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Master Plumber Licensing Exam (UPC/IPC-based) · Cómo revisamos