Water Supply & DistributionPregunta 43 de 120
A potable water line supplies makeup water to a chemically treated boiler system and the connection is under continuous pressure. Which backflow prevention device is required?
a.Double check valve assembly
b.Atmospheric vacuum breaker
c.Reduced pressure principle backflow preventer
d.Hose bibb vacuum breaker
Explicación
Treated boiler water is a high hazard (health hazard) contaminant and the connection is under continuous pressure, which calls for a reduced pressure principle assembly. A double check assembly is only acceptable for low hazard, non-health, continuous pressure applications. An atmospheric vacuum breaker cannot be used under continuous pressure at all, and a hose bibb vacuum breaker is for hose outlets and protects only against back-siphonage.
Referencia Legal: IPC §608.13Practica las 120 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- PEX tubing runs horizontally for 16 ft above a suspended ceiling. Using the maximum horizontal support spacing of 32 in for PEX, what is the minimum number of supports?
- To limit erosion-corrosion and noise, what is the generally accepted maximum design velocity in a copper hot water distribution line?
- A commercial kitchen is being piped with solenoid-operated quick-closing valves on the dishwasher and ice machine supplies. What does the code require on those branches?
- A fire sprinkler system with no antifreeze or chemical additives is connected to the potable water supply under continuous pressure. Which assembly is the appropriate minimum protection for this low hazard connection?
- An atmospheric vacuum breaker serves a fixture whose flood level rim is 34 in above the finished floor. What is the minimum height above the floor at which the vacuum breaker may be installed?
- A pressure vacuum breaker protects a lawn irrigation zone whose highest sprinkler head is 42 in above grade. What is the minimum height above grade for the vacuum breaker?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Journeyman Plumber Licensing Exam (UPC/IPC-based) · Cómo revisamos