| 摘要 |
Sewerage pumping apparatus is provided for delivering sewerage collected by gravity in a wet well to a force main which supplies sewerage by force to a remotely located sewerage treatment plant. The sewerage pumping apparatus comprises a hydraulically driven submersible pump located in the wet well for supplying sewerage to the force main. Two trailer-mounted hydraulic pump units (main and standby) adjacent the wet well are alternatively operable to supply pressurized hydraulic fluid to drive the submersible pump. Check valves prevent the operative pump unit from supplying hydraulic fluid to the inoperative pump unit. The main pump unit is driven by an electric motor energized from a nearby electric utility power line. The standby pump unit is driven by an internal combustion engine. Float switches sense the sewerage level in the wet well and regulate operation of the in-service pump unit (and submersible pump) accordingly. Apparatus, including an emergency float switch, is provided for sensing an electrical utility power failure which renders the electrically driven main pump unit inoperative and for starting the engine for the standby pump unit to thereby maintain the submersible pump in operation.
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