Backflow Prevention Requirements for Commercial Dishwashing Machines
|Publication Date:||1 May 2008|
The backflow prevention device shall be: a) An air gap complying with ASME A112.1.3; b) An atmospheric type vacuum breaker complying with ASSE 1001; c) A hose connection vacuum breaker complying with ASSE 1011; or d) A hose connection backflow preventer complying with ASSE 1052.
Air Gap Minimum
The minimum air gap shall be two (2) times the diameter of the supply orifice, or 1.0 inch (25.4 mm), whichever is larger.
This standard applies to the backflow prevention device used on the potable water supply connected to a commercial dishwashing machine.