Abstract: A liquid transport system. The liquid transport system includes a gas displacement piping section fluidly coupled to a centrifugal pump or to other portions of the liquid transport system. The gas displacement piping section includes an inlet, and outlet and a gas discharge located between the inlet and outlet for enabling gases to escape or be displaced from the gas displacement piping section, the gas displacement piping section being configured to cause entrained gases in flowing liquid to migrate toward the gas discharge. In centrifugal pump embodiments, the gas displacement piping section may be fluidly coupled upstream or downstream of the centrifugal pump, and may include a vacuum pump and/or float valve coupled to the gas discharge.

Abstract: A dry-pit submersible pump using a totally enclosed fan-cooled (TEFC) electric motor to power the pump. A release mechanism prevents the fan from creating excessive drag when submerged in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially submerged, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades.