ASAP BACKFLOW TESTING AND CERTIFICATION AND REPAIRS
You may have heard of it, and you may understand some of what it involves. This website will help you to understand it better; exactly what it is, and how to prevent it.
Backflow is the undesirable reversal of the flow of water
or mixtures of water and other undesirable substances from any source (such as used water, industrial fluids, gasses, or any substance other than the intended potable water) into the distribution pipes of the potable water system. There are two types of backflow conditions: backpressure and backsiphonage.
Occurs when the user system is at a higher pressure than the supply water systems allowing undesirable substances to be “pushed” back into the potable water system. Some causes are: booster pumps, potable water system connections for boilers, interconnection with other pip- ing systems operating at higher pressures, or higher elevations in user systems such as high rise buildings.
One specific example of this would be a steam heating system with the make up water line piped directly into the boiler. The higher pressure in the boiler could force the chemically treated boiler water back through the make up water line and into the potable water system.
Occurs when negative or reduced pressure exists in the supply piping allowing undesirable substances to be “drawn” into the potable water supply. Some causes are:
undersized supply piping, supply line breaks, reduced supply system pressure on the suc- tion side of an on line booster pump, or sudden upstream high demand. An example of this is a child drinking milk with a straw. The child “sucks” on the straw and the milk flows
up the straw and into the child’s mouth. What the child is actually doing is creating a sub atmospheric pressure in his mouth and the atmospheric pressure (14.7psia at sea level) is pushing down on the surface of the milk and forcing the milk up the straw and into the child’s mouth.
There is one other very important term that must be understood before we can proceed. The term is “Cross Connection,” and it is defined as any
actual or potential connection between a potable water system and any other source or system through which it
is possible to introduce into the potable system any used water, industrial fluid, gas, or other substance other than the intended potable water with which the system is supplied. By pass arrangements, jumper connections, removable sections, swivel or change over devices and other permanent or temporary devices through which, or because of which, backflow can or may occur are considered to be cross connections.
ASAP BACKFLOW TESTING
5512 WILMIN WAY
JACKSONVILLE, FL 32207