Safe, clean water is a prime concern with any population, necessitating the need for standards and regulations to simplify our acquisition of this basic molecule of life. Among the many topics relevant to potable water is backflow, an undesirable effect involving the reversal of the flow of water or mixtures of other substances from any source into the distribution pipes of the potable water system. For beverage dispensing equipment, the specifications and testing for a standard backflow preventer device are addressed in the ASSE Standard 1022-2017 – Performance Requirements for Backflow Preventer for Beverage Dispensing Equipment, an American National Standard.
Prior to the establishment of the first edition of this standard in 2003, many concerns had persisted with the dual check valve commonly used for backflow prevention, as it does not show any visible indication of failure. Originating from numerous requests by regulatory authorities, manufacturers of backflow prevention devices, consumers, and users of the equipment, ASSE Standard 1022-2017 covers a standard backflow preventer for beverage dispensing equipment (called the “device” in the document) that includes two check valves and an atmospheric vent.
This vent, or atmospheric port, is located between two independently acting check valves biased to a normally closed position. With these three key components, the device is engineered for installation in carbonated post-mix dispensing systems. According to ASSE Standard 1022-2017, these devices are intended for use under continuous or intermittent pressure conditions, and the port is to vent liquids, gases, or both, under backflow conditions.
ASSE Standard 1022-2017 details an array of performance tests, including those for hydrostatic pressure, atmospheric port leakage, water flow, temperature extremes, check valve sealing pressure, endurance, atmospheric port-opening pressure, and check valve leakage. Three devices of the model being tested are to be submitted under the conditions covered in the standard. Failure of any one of the three devices results in a rejection of that type or size.
ASSE Standard 1022-2017 – Performance Requirements for Backflow Preventer for Beverage Dispensing Equipment is available on the ANSI Webstore.