Friday, June 19, 2020

Type of pumps

Type of pumps


Pumps are used for extract the liquid and transfer one source of liquid to another source. Pumps are uses in many industries like refineries, petrochemicals, oil and gas, pharmaceuticals, power plants, hospitality and home application etc. It also is very useful mechanical device. On the basis of working and construction pumps classification into many types. On other site


Classification of pump

  1. Positive displacement pump

  2. Centrifugal pump (Dynamic pump)

Centrifugal pump


Centrifugal pump is a mechanical device, it is work on the principle of centrifugal force. Impeller is rotated by driver, (turbine or motor) in the pump casing. Impeller sucks the liquid through impeller eye from low pressure. After the rotating of the impeller pushes the liquid to outward in casing and where discharge the liquids through nozzle. Centrifugal pump is also called dynamics pump the centrifugal pump converts the kinetic energy of the liquid to pressure energy. There are many types of centrifugal pumps for learn more go to next lecture of centrifugal pump.

Positive displacement pump


Positive displacement pump used to transfer of fixed volume of liquid with high pressure. The pump suck the liquid from suction line and discharge the liquid to discharge line of the system. Positive displacement pump is mostly use for transfer high viscus fluid with high pressure as compare to dynamics pump. There are two types of positive displacement pump,
  1. Rotary pump
  2. Reciprocating pump
In the Rotary pump there are mainly types of pump listed below like,  gear pump.
  1. Screw pump
  2. Lobe pump
Reciprocating pump classified into mainly two categories.
  1. Piston pump
  2. Plunger type pump
  3. Diaphragm pump
Reciprocating pump are classified on the based of acting There are two types of reciprocating pump mentioned below
  1. Single acting reciprocating pump
  2. Multi acting reciprocating pump


Rotary pump

Rotary pump is a positive displacement pump. It is used for transfer the high viscous fluid with high pressure and constant volume. This type of pump discharges fluid with fix volume liquid in each rotation. This is second most popular pump in the industry after the centrifugal pump. Mostly it is use for discharge lube oil and other clean fluid.


Gear pump

This is type of positive of displacement (Rotary) pump. Gear pump is use for transfer high viscose and clean fluid like lube oil, paints and other type of fluids. Gear pumps is use in many industries like oil and gas, petrochemical and other pharmaceuticals' industries. The gear pump transfer liquid by gives force energy  to liquid and discharge the constant values of liquid. Gear pump operated at very high speed and give pulsations free flow. It is also self priming pump. Due to the very close clearance between the internal parts and casing of gear pumps cause. During long time of operation Internal wear increases'. And reduce the efficiency and increase maintenance cost downtime. There are two types of gear pumps.
  1. Internal gear pump
  2. External gear pump


Lobe pump

Lobe pumps is also work like external gear pump. It can also handle semi-solid liquid, there are two lobes uses in lobe pump, but they are not directly connected in between, put them some clearances. That's clearance maintained by timing gears lobe pump many seals used. It is mostly used paper and pulp and food industries. Lobe pump can also handle slurry and other high viscus fluid.


Screw pump

Screw pump use two or three screw in closed casing system. This is also used for lubrication purpose for rotating equipment. This is used for deliver uniform flow with low pressure. Because of the screw pump have low efficiency so that produce very less noise as compared to other positive displacement pump. It is less expensive than gear pump. It is also used of variety of industries.


Piston pump

Piston pump used for high flow with high pressure. As compared to other positive displacement pump. Piston pumps is a combination of piston, suction valve, discharge valves, piston rod and connecting rod. It has also additional disadvantage because, it is highly extensible, more complicate and complex, its maintenance cost is also high. Generally, two types of piston pumps are used in industries, single acting pump and double acting pump, in single acting pump discharge only one side of the cylinder and double acting pump discharge of the fluid in both end of the cylinder (backward and forward) movement.

Diaphragm pump

It is also a type positive displacement pump. And it is a combination of diaphragm and piston. In this pump piston is not directly contacted with service because diaphragm use between service liquid and piston. They are also used very high pressure and uniform flow. It is also very expensive and high maintenance cost, the diaphragm material could be plastic, Teflon, synthetic, and rubber etc. Diaphragm pumps have very complex design and maintenance. Diaphragm pump used to transfer high viscous fluid like salaries oil and other services.


Plunger pump

Plunger pump is a type of positive displacement pump. The plunger pump is combination of piston and plunger systems, used reciprocating motions for transfer fluid.  

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