Backpressure

Due to the length of a main distribution pipe, the several pipe fittings and the normal elevation of the service above the distribution main, the pressure gradient within a service decreases as the point of discharge becomes further and further from the main. Consequently, in many processing plants or high-rise buildings there is need to use a booster pump; or, in many instances, a recirculating pump. The use of an in-plant pump can easily increase the in-plant pressure above that of the supply main. Thus, if there is any pathway whereby this pressurized industrial water may enter the potable distribution system, there will be a hazard as the result of this backpressure.