CENTRIFUGAL PUMP (Introduction)

Well for the inspectors, trainees, and freshers who just move into the piping systems will have their introduction, with fluid transporting devices which are mainly “PUMPS“. Almost piping system have the basic and the mostly optimized device know as centrifugal pump those are  handled easily and  it is cheaper when compared to other pumping devices, even maintenance cost is much lesser than the others. But the LIMITATION ( •cannot handle entrained air – 3%max •cannot handle viscous liquids)

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Stuffing box: To avoid leakage along the driving shaft at the penetration point on casing.

THERE’RE 5 MAIN PUMP STYLES:

1-Horizontal Split Case

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Easy maintenance without concerns of piping alignment
  • good wear resistance (Mean of higher price )
  • suction and inlet are opposite
  • high head pressure ( Cooling tower service )

2-End suction

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Wide range of services in all industries requiring the transfer of fluids. These pumps should be the first consideration when pumping  low viscosity (approximately 500 cps or less) fluids. (Water = 1cps, Heated Fuel oils = 100 ~ 300, Honey = 10000)

3-Submersible

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Marflex: Electric driving motor, Framo: HPU driving system
  • There’re two type: Fix and portable pump those be arranged on Tanker, chemical Tanker ect.,

4-Vertical Multi-Stage 

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Upon leaving the first stage, the fluid enters the second stage where the pressure is increased further. The more stages the pump has, the higher the final discharge pressure.

Because the clearances in these pumps is Because the clearances in these pumps is small, clean water applications are best for this type of pump.

•  High pressure shower systems

•  Boiler feedwater 

•  Desuperheater feed

5-Vertical Turbine

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This type of pump is comprised of a motor, discharge head, one or more flanged columns to house the shaft, and one or more bowls (or stages). It’s also recommended that a basket strainer is installed on the last bowl to prevent large solids from entering the pump.

Most commonly used to pump out of deep pits or wells. (giếng)

There are no priming issues due to the impellers being submerged in fluid.

FOCUSED TERMINOLOGY 

Cavitation – The formation of vapor bubbles in liquid, developed in areas where the
pressure falls below the vapor pressure of the liquid. The imploding or collapsing of
these bubbles as they move to higher pres-sure areas in the pump triggers intense
shockwaves inside the pump, causing significant damage to the impeller and/or the pump housing.

pump-inducer.jpg

Head – Simply put, head is the height at which a pump can raise a fluid up.

Priming – The act of clearing air from the pump’s internals in order to function.

MAIN COMPONENTS

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IMPELLER TYPE, VORTEX (GOOD FOR ABRASIVE FLUID), CHOPPER (LOW CAPACITY BUT CUT THE GARBAGE), NON-CLOG (CLOG RESISTANCE), GRINDER (GOOD FOR SMALL PIPING AND IMPURITY FLUID)

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