Potable water supplies to systems
having no pumps or connections for pumping equipment,
and no chemical injection or provisions for chemical
injection, shall be protected from backflow by one of the
following devices:
- Atmospheric vacuum breaker (AVB)
- Pressure vacuum breaker backflow prevention assembly (PVB)
- Spill-resistant pressure vacuum breaker (SVB)
- Reduced-pressure principle backflow prevention assembly (RP)
Where sprinkler
and irrigation systems have pumps, connections
for pumping equipment, or auxiliary air tanks, or are
otherwise capable of creating backpressure, the
potable water supply shall be protected by the following
type of device where the backflow device is
located upstream from the source of backpressure:
- Reduced-pressure principle backflow prevention assembly (RP)
W here systems have a backflow device installed
downstream from a potable water supply pump or a
potable water supply pump connection, the device
shall be one of the following:
- Atmospheric vacuum breaker (AVB)
- Pressure vacuum breaker backflow prevention assembly (PVB)
- Spill-resistant pressure vacuum breaker (SVB)
- Reduced-pressure principle backflow prevention assembly (RP)
Where systems include a chemical injector or provisions
for chemical injection, the potable water supply
shall be protected by a reduced-pressure
principle backflow prevention assembly (RP).