Pumping stations for water and sewage |
Sewage pumping stations serving sanitary sewer systems should be able to pump the design peak instantaneous sewage flow. There are four major types of sewage pumping stations that the designer may consider for site specific conditions: wet well/dry well, submersible, suction lift and screw pump. Sewage pumping stations should be designed so that they can be upgraded to handle future peak flows from the ultimate tributary area with minor modifications (e.g., pumps, motors or impeller changes).
Booster pumping stations are aimed to maintain adequate pressures and flows in water distribution systems as a result of both changes in ground elevation and distance from the source of supply. Booster pumping stations should be designed to service specific areas of a water distribution system based on defined limits. These areas are generally isolated from the remainder of the system by control valves. Booster pumping stations may have incorporated with part of their operation, elevated or ground storage reservoirs which will serve to supply extreme demands, such as peak hour, fire flow and other emergency requirements. A hydraulic transient analysis should be undertaken during the design of pumping stations to ensure that the transients resulting from events such as pumps starting, stopping, and full load rejection during power failure do not adversely affect either the customers on the water system or the piping in the station or the system. Methods of surge protection that can be used to protect stations include: surge anticipator system, slow closing and opening control valves on pump discharges, surge tanks on discharge headers or variable speed pumping units. |
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