603.5.6 Protection From Lawn Sprinklers and Irrigation Systems

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:

1. Atmospheric vacuum breaker (AVB)
2. Pressure vacuum breaker backflow prevention assembly (PVB)
3. Spill-resistant pressure vacuum breaker (SVB)
4. 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:

1. 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:

1. Atmospheric vacuum breaker (AVB)
2. Pressure vacuum breaker backflow prevention assembly (PVB)
3. Spill-resistant pressure vacuum breaker (SVB)
4. 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).