Q Process Technology Equipment Ch. 6 Key Terms Test A. Single-acting piston pump B. Stuffing box C. Suction static head D. Total head E. Vane pump F. Vanes G. Axial pump H. Bearings I. Canned pump J. Cavitation K. Centrifugal force L. Centrifugal pump M. Cutwater N. Deadhead O. Diaphragm pump-a P. Discharge static head Q. Double R. Dynamic pump S. External gear pump T. Head U. Impeller V. Internal gear pump W. Liquid head X. Lobe pump Y. Magnetic drive Z. Mechanical seal a. Multistage centrifugal pump b. Net positive suction head c. Net positive suction head available d. Net positive suction head required e. Piston pump f. Plunger pump g. Positive displacement pump h. Priming i. Pump j. Pump performance curve k. Reciprocating pump l. Rotary pump m. Screw pump n. Seal o. Seal flush p. Venturi q. Viscosity r. Volute s. Wear rings 1.__-a dynamic pump that uses a propeller or row of blades to propel liquids along the shaft. 2.__-mechanical components that keep the pump shaft in alignment with the casing and absorb axial and radial forces. 3.__-a seal-less pump that ensures zero emissions. It is often used on EPA-regulated liquids. 4.__ condition inside a pump in which the liquid being pumped partially vaporizes because of variables such as temperature and pressure drop, and the resulting vapor bubbles then implode. 5.__ the energy that cause something to move outward from the center of rotation. 6.__ a type of dynamic pump that uses an impeller on a rotating saw to general pressure and move liquids. 7.__a thick plate in the discharge nozzle of a pump that breaks the vortex. 8.__also called shut-off pressure, it is the maximum pressure (head) that occurs when a pump is operating with zero flow (discharge valve shut). 9.__a mechanically or air-driven positive displacement reciprocating pump that uses flexible membrane to move liquid. 10.__-the vertical distance between the center line of a pump and the surface of the liquid on the discharge side of the pump (if the discharge line is submerged) or the pipe end (if the discharge line is open to the atmosphere). 11.__-acting piston pump-a type of piston pump that takes suction and discharges by reciprocating motion on every stroke 12.__-a type of pump that converts the spinning motion of a blade or impeller into dynamic pressure to move liquids. p. 104. 13.__-a type of positive displacement rotary pump in which two gears rotate in opposing directions, allowing the liquid to enter the space between the teeth of each gear in order to move the liquid around the casing to the discharge. 14.__-measurement of pressure caused by the weight of a liquid, measured in feet or meters, determined by the height of the liquid above the centerline of a pump. 15.__-a device with vanes that spins a liquid rapidly in order to generate centrifugal force. 16.__-a type of positive displacement rotary pump, called a "gear within a gear" pump, in which two gears rotate in the same direction, one inside the other, and trap liquid between the teeth of the gears to move liquid from suction to discharge. 17.__pressure developed from the pumped liquid passing through the volute. 18.__a type of positive displacement rotary pump consisting of a single or multiple lobes: liquid is trapped between the rotating lobes and is subsequently moved through the pump. 19.__-a type of pump that uses magnetic fields to transmit torque to an impeller, . 20.__-seals that typically contain two flat faces (one that rotates and one that is stationary), that are in close contact with one another in order to prevent leaks. 21.__-a type of pump that uses two or more impellers on a single shaft (generally used in high-volume, high-pressure applications, such as boiler feed water pumps). 22.__ the liquid head (pressure), minus the vapor pressure, that exists at the suction end of a pump. 23.__NPSH available from the pump system; it must always be equal to or greater than the NPSH 24__Pump characteristic established by manufacturer testing that indicates the the amount of NPSH necessary for the pump to function properly 25.__a type of positive displacement reciprocating pump that uses a piston inside a cylinder to move fluids 26._-a type of positive displacement reciprocating pump that displaces liquid using a plunger and maintains a constant speed and torque. 27.__-a type of pump that uses pistons, diaphragms, gears, or screws to deliver a constant volume with each stroke 28.__the process of filling the suction line and casing of a pump with liquid to remove vapors and eliminate the tendency for it to become vapor-bound or to lose suction 29.__a mechanical device that transfers energy to move liquids through piping systems. 30.__a specification that describes the capacity, speed, horsepower, and head needed for correct pump operations 31.__-a type of positive displacement pump that uses the inward stroke of a piston or diaphragm to draw liquid into a chamber intake) and then positively displace the liquid using an outward stroke (discharge) 32.__-a type of positive displacement pump that moves in a circular motion to move liquids by trapping them in a specific area of a screw or a set of lobes, gears, or vanes, 33.__-a type of positive displacement rotary pump that displaces liquid with a screw. The pump is designed for use with a variety of liquids and viscosity and a wide range of pressures and flows. 34.__-a device that holds lubricants and process fluids in place while keeping out foreign materials where a rotating shaft passes through a pump casing. 35.__a small flow (slip stream) of pump discharge or externally supplied liquid that is routed to the pump's mechanical seal. This acts as a barrier liquid between the two faces of the seal to reduce friction and remove heat. 36.__acting piston pump-a type of piston pump that pumps by alternating suction and discharge actions on each piston stroke 37.__- the area in a pump's casing that contains the packing material. 38.__-the vertical distance between the center line of a pump and the surface of the liquid on the suction side of the pump. 39.__a measure of a pump's ability to move liquid through a pumping system. 40.__-a type of positive displacement rotary pump having either flexible or rigid vanes designed to displace liquid. 41.__-raised ribs on the impeller of a centrifugal pump designed to accelerate a liquid during impeller rotation. 42__a device consisting of a converging section, a throat, and a diverging Section: its purpose is to create a constriction in a pipe. 43.__-the degree to which a liquid resists flow under applied force leg. molasses has a higher viscosity than water at the same temperature. 44.__a widened spiral casing in the discharge section of a centrifugal pump designed to convert liquid speed to pressure without shock. 45.__--close-running non-contacting replaceable metal rings located between the impeller and casing of a centrifugal pump; wear rings allow for a small clearance between the two components. 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