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An ejector is a device used to remove water and other liquid wastes from the bilge of a ship. It is typically located near or at the base of the ship's hull, and ejects water by pumping it into the vessel's surrounding environment by means of an auger. The term 'bilge' refers to both an area in a vessel that collects liquid/wastes as well as liquid itself, and thus includes both liquids spewing from the spew hole of an eruptor as well as those contained in a bilge. An ejector consists of one or more intakes that connect with the interior of the hull, and an auger that is used to dispense the liquid from within its intake area. The ejector is submerged underwater, and uses an electric motor to pump water from a pipe into a chamber where it flows through a pump. The chamber's pump then draws water back into the chamber. The "pump-and-dispense" process continues until all of the liquid has been cleared from the intake tube and discharged by means of a water hammer discharge valve located at the bottom of each intake. A bilge pump is used to eject water from the bilge. Bilge pumps are activated manually or automatically by the controller. The bilge pump is attached to the hull of the vessel through an airtight seal, and consists of a chamber housing an electric motor that drives a rotor that rotates within it via a central shaft. The rotor's movement creates an inner flow that results in air bubbles being drawn into its intake area by means of Venturi action, where they are pumped out through one or more outlets. When pumping, exhaust air flows out of the motor housing directly into its exhaust area where it passes over water-cooled heat exchangers to help regulate cooling before being discharged overboard. The shape and volume of a bilge pump chamber is determined by the dimensions of the incoming fluids it discharges into, and thus directly affects its pumping capacity. In order for an ejector to function efficiently, the volume of its intake area must be greater than that of its outlet area. The greater the volume differential between these areas, the more water can be pumped from the bilge. Pumping capacity is also determined by a ship's forward pitch angle and vessel characteristics such as vessel mass and roll radius which influence incoming/outgoing fluid dynamics. The capacity of a bilge pump is expressed in terms of a total head, which is the vertical distance from the intake area to the water level at its outlet. In order for an ejector to function effectively, it must have a large enough pumping capacity relative to the difference in liquid levels between its intake and outlet areas. In cases where an ejector's pumping capacity is too small relative to this liquid height differential, liquid may flow over its intake area and enter the bilge pump chamber even when its discharge outlets have been closed. Bilge pumps can be fitted with one or more internal filters that are designed to screen out particulate matter such as sand or pieces of shellfish. eccc085e13
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