what are the typical applications and limitations for using and selecting a low pressure force main system? Clearly sketch a low pressure sewer system.

Answer the attached problems. One paragraph for each question is enough.

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Sketch a schematic drawing of a pneumatic sewage ejector system. Describe the situations pr circumstances where a pneumatic ejector station might be used. Discuss the unusual operating characteristics of a pneumatic ejector station as compare to an electrically (motor) driven duplex pumping system.
Why do engineers typically select larger peaking factors (PF) for water booster pumping stations than for sewage pumping stations?
Why does it take longer to fill a hydropneumatic water tanc than to empty the tank when the system is in operation?
List at least three factors to be considered when selecting the location of the manholes the design of gravity sewer systems.
Why are peaking factors (PF) typically larger for gravity sewer system design than for sewage pump station design?
Hydraulic ram is a water driven device that pumps water from a lower elevation to a higher elevation without electrical energy being applied. Explain the principle of operation of a hydraulic ram (view:
http://en.wikipedia.org/wiki/Hydraulic_ramhttp://en.wikipedia.org/wiki/Hydraulic_ram )
What is a “low pressure” sewer system? When would an engineer decide to use a low pressure sewer system, i.e.: what are the typical applications and limitations for using and selecting a low pressure force main system? Clearly sketch a low pressure sewer system.
What is a “vacuum” sewer system? When would an engineer decide to use a a vacuum sewer system, i.e.: what are the typical applications and limitations for using and selecting a vacuum sewer system? Clearly sketch a vacuum sewer system.

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