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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 prevent or used to isolate the cross connection and the probability that a non-potable substance is present properly selecting a backflow prevent or 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 prevent or 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 most common devices include an air gap a reduced pressure principal backflow prevention assembly abbreviated as RP double check valve backflow prevention assembly or DC VA and pressure vacuum breakers abbreviated as PV B air gap is the most effective way to prevent a cross connection by a separation between a potable water source and a non-potable source because air disrupts the flow an air gap is not a device rather it is simply physical space an air gap may look like this or this the most common place you see an air gap is in a kitchen and bathroom there should always be space between the water source and the flood level rim of the receiving vessel reduce pressure principal assembling reduced pressure principal backflow preventers or RP provide maximum protection against back pressure and back siphon each conditions this device consists of two spring-loaded check valves with a pressure differential relief valve located between the checks water flows into the first check valve as the first check opens it fills the reduced pressure zone and the top of the diaphragm at the relief valve at a minimum of 2 psi G 138 PA Gage if there is a back pressure backflow or back siphoning both checks will close and the relief valve will open venting water to the atmosphere RP is an assembly designed for both high and low hazard applications RPS must not be installed in pits where the relief valve could become submerged RP should not be installed where platforms ladders or lifts are required for excess double check valve assembly this assembly consists of two internally loaded independently operating check valves installed as an assembly between two resilient seated shutoff valves and four properly located test in normal operation the check valves will open to allow water to pass through in a back pressure situation the second check should close if it doesn't seal properly the first check will back up the second the DC VA is only used for low hazard applications pressure...
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