POSITIVE DISPLACEMENT PUMP(PDPs) BASIC DEFINITION: A constant flow rate fluid pumping device use to displace the fluids(usually viscous & fragile) in the direction of pressure force. WORKING PRINCIPLE: It operates in such a way that it takes certain FIXED amount of the fluids and transfer it to desired place with the use of cavities (in some type) arranged in a manner that having increasing area at suction side(inlet) and decreasing at discharging side(outlet).
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POSITIVE DISPLACEMENT PUMP(PDPs)BASIC DEFINITION: A constant flow rate fluid pumping device use to displace the fluids(usually viscous & fragile) in the direction of pressure force.
WORKING PRINCIPLE: It operates in such a way that it takes certain FIXED amount of the fluids and transfer it to desired place with the use of cavities (in some type) arranged in a manner that having increasing area at suction side(inlet) and decreasing at discharging side(outlet).
RECIPROCATING PUMP:Its construction includes the air pumping cavity run via motor, connected with cam with the two set of valves*
If air pumping is done by piston then it is termed as PISTON PUMP.if pumping of air is done via plunger then it is known as PLUNGER PUMPIf air is pumped through diaphragm then it is called as DIAPHRAGM PUMP.
*valves are of such type that it allows flow only in one direction. Named commonly as check valve or non-return valve.
PISTON PUMP:
PLUNGER PUMP:
DIAGRAGM PUMP:
ROTARY PUMP:A pump type wherein fluid is transferred via rotating element, meshing or squeezing the fluid in some pattern.When meshing is of gears it is called GEAR PUMP.When meshing is of lobes it is LOBE PUMP.When meshing is of screws it is SCREW PUMP.When rotating element contains vanes it is called VANE PUMPWhen rotating element contains hose it is PERISTALTIC PUMPWhen rotating element contains increasing cavity it is PROGRESSIVE CAVITY PUMP.
WORKING PRINCIPLE OF ROTARY PUMP
PUMP
GEAR PUMP (EXTERNAL & INTERNAL):
CRESCENT DRIVERDRIVEN
MESHING GEARS
SPURHELICALHERRINGBONE Design Complexity, CostVibration, Chatterincreaseincrease
LOBE PUMP:
VANE PUMP:
PERISTALTIC PUMP:
SCREW PUMP:
SLANTEDSTRAIGHT
PROGRESSIVE CAVITY PUMP:
WHY to chose PDPsHigh viscosity fluidsFlow is regardless of pressureChanging viscosity fluids(varies with pressure)High PressureShear Sensitive LiquidsSelf-PrimerLow flowPumping SlurriesNo shaft seal
WHY not to chose PDPsSafety or Relief valve is necessary.Low viscosity.High gpm (gallons per minute).High rpm(revolutions per minute).Losses occur in form of slip(due to pressure variation).
UBAID UR REHMAN (IM-302)M. SAAD SAJID (IM-305)
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