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What is the required backflow preventer for an irrigation system?

April 26, 2017backflow irrigation Preventer system

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What is the required backflow preventer for an irrigation system?

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Section P2902.4.3 of the IRC states the following: P2902.4.3 Lawn irrigation systems. The potable water supply to lawn irrigation systems shall be protected against backflow by an atmospheric-type vacuum breaker, a pressure-type vacuum breaker or a reduced pressure principle backflow preventer. A valve shall not be installed downstream from an atmospheric vacuum breaker. All devices shall be installed in accordance with manufacturer’s installation instructions. The IRC states that an atmospheric-type vacuum breaker, a pressure-type vacuum breaker or a reduced pressure principle backflow preventer should be used for a lawn irrigation system. However, in the process of adoption of the IRC this section should have been modified to omit the requirement for a reduced pressure principle backflow preventer, and require a double check backflow preventer. The double check has and will continue to be the approved backflow prevention device for this application.