Booster Pumps In Distribution Systems

In order to maintain distribution system pressures within the desirable 40- to 90-lb/in2 (275- to 620-kPa) range, booster pumps may be required at various locations, as dictated

FIGURE 11 Plan of the high-service pumping station in the East Side water treatment plant, Dallas (1 in = 2.54 cm; 1 ft 0.3048 m) (URS/Forrest and Cotton)

FIGURE 12 Typical system-head curves for high-service pumpage to water distribution system (1 ft = 0.3048 m; 1 gpm = 0.227 m3/h)

FIGURE 12 Typical system-head curves for high-service pumpage to water distribution system (1 ft = 0.3048 m; 1 gpm = 0.227 m3/h)

by topographical conditions and system layout. Booster stations may include in-line vertical or horizontal pumps connected directly to the pipeline or separate storage reservoirs and pumps. The latter method is preferred but is not always practicable because of land requirements for the storage reservoir.

In-line booster pumps should be sized to match the capacities of incoming pipelines and should be capable of supplying the additional head required to increase pressures to desirable ranges in the affected area of the distribution system. Determination of discharge head must take into account the pressure on the suction side of the pump as well as static head, frictional losses, and desired residual pressure on the discharge side.

Many water utilities refuse to accept in-line pumps as satisfactory for booster service and require construction of a pressure-equalizing storage reservoir. Horizontal or vertical booster pumps then take suction from the storage reservoir and return water at higher pressures to the mains. Pressure switches or floats automatically start and stop the booster pumps and thus eliminate the need for continuous attendance.

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