Backflow Installation OTC Application DOC Form

Instructions and help about Backflow Installation OTC Application doc

every cross connection poses a different risk based on the probability of the occurrence of the following a physical connection between the potable water supply and a hazardous substance the occurrence of backflow conditions back pressure or back siphon j-- the total failure of the backflow preventor used to isolate the cross connection and the probability that a non potable substance is present properly selecting a backflow preventor depends on an accurate assessment of the risk of contamination of a potable water supply the degree of hazard high to low must also be identified installation criteria and hydraulic conditions must be evaluated by a trained professional before a backflow preventor can be installed several organizations set and recommend certain types of methodologies devices and assemblies of backflow preventers many devices can prevent backflow of contaminants into a water system the degree of Hazard generally determines which of the basic devices that should be used the