Pump and Dredge Common Terms Defined
Need to know terms of dredging and pump talk. Education Series and Common Terms Clients Use.
Keywords you should know when you talk pumps with your friends BBQing this weekend.
BEP (Best Efficiency Point) – An operating region or point along the PPC at which the rate of flow of a pump operates at the highest or optimum efficiency for a given speed and impeller diameter.
Radial flow – Where the fluid being pumped by a centrifugal pump is discharged radially or at right angles to the pump shaft.
NPSH (Net Positive Suction Head) – Made up of two components. NPSH available: The absolute pressure at the suction port of the pump. NPSH required: The minimum pressure required at the suction port to prevent pump from cavitating.
Head – The measured height at which a pump can raise water. Specifically the head discharge. The energy of a liquid in reference to an arbitrary datum that is expressed in units of energy per unit weight of liquid.
Total head – The sum of the discharge head, suction head and friction loss in a pump. Total head is also defined as the work done by the pump per unit weight, per unit volume of fluid.
PPC (Pump Performance Curve) – Typically a plot such as total head vs. flow rate. The plot is used to determine the total head of a pump when given the flow rate of the pump.
Pipe friction loss – The loss of pressure or head that occurs in a pipe. This is due to the effect of the fluid’s viscosity near the surface of the pipe.
Pressure Drop – A difference in pressure due to a pressure decrease. Also it is the loss of potential energy where typically there is friction(‘heat’) of the fluid due to flow disturbance.
Cavitation – The formation of air pockets or cavities in liquid, occurs in areas of relatively low pressure around the impeller.
Specific gravity(Liquid) – The ratio of the density of a liquid to the density of water at 4°C.
Viscosity – A measure of the response(resistance) to gradual deformation through stress. Liquid viscosity corresponds to the ‘thickness’ of the medium.
BHP (Brake HorsePower) – The measure of the force needed to brake the engine, the available power of an engine.
Flooded Suction – Suction pump chamber that is full of liquid because of the liquid level and pressure in the suction tank.
Slurry transport – hydraulic conveying, conventional lean slurry and high concentration slurry disposal
Water hammer – An increase in pressure due to a fluid in motion has a sudden change in momentum(sudden change in direction).
Volute – The casing of the centrifugal pump or and Eddy Pump that receives the fluid being pumped by the impeller, and slowing down the fluid’s flow rate.
Impeller – The rotor is inside the case, of a pump. This has the purpose of increasing or decreasing the pressure and flow rate of a fluid. The recessed impeller and unique design of the EDDY Pump is what make our pump excel while moving solids/slurry.
A look inside the Eddy Pump
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