WELCOME

VARIOUS SUCTION MODE & FORCE MODE PUMPS USED

IN BANGLADESH

PRESENTED BY Mirajum Munira Priya Student ID: 1107063

Faria Mehzabin Prema Student ID: 1107046

Meshkatun Zannat Student ID:1107081

Suction mode pump: Suction mode is where the pump is above the ground water level & literally lifts the water from ground to the surface .The depth from which water can be lifted is influenced primarily by atmospheric pressure. (limit generally 21 feet)

Force mode pump: Force mode is where the pump is placed below the ground water level & propels the ground water to the surface.

SUCTION MODE PUMPCENTRIFUGAL PUMPA centrifugal pump may be defined as one in which an impeller rotating inside a close – fitting case draws in the liquid at the centre and, by virtue of centrifugal force, throws out through an opening at the side of the casing.

MAIN PARTS OF CENTRIFUGAL PUMP

MAIN PARTS OF CENTRIFUGAL PUMP

OPERATING PRINCIPLE OF CENTRIFUGAL PUMP

Fluid is directed to the impeller & is forced into a circular movement by rotation of impeller vane.

The fluid is then pressed out of the impeller by means of centrifugal force.

Then the fluid leaves the impeller channel with increased pressure & velocity.

Fluid velocity is also partly converted into pressure by the pump casing & it leaves the pump through the outlet.

ADVANTAGE, DISADVANTAGE & APPLICATION

ADVANTAGE less frictional losses. Simple in construction. Low initial cost. Can handle liquid in solid suspension. Produce a constant steady discharge.

DISADVANTAGE Develop cavitation. Relatively poor suction power.

APPLICATION Iirrigation. Sewage service. Domestic water supply.

FORCE MODE PUMP

SUBMERSIBLE PUMP submersible pump is a type of construction in

which a tightly seal driving motor is coupled directly to the turbine bowl assembly and is designed to be submerged in the fluid pumped. Power is supplied to the motor by a highly insulated waterproof electrical cable running from the motor to the power source.

Construction

PUMP ELEMENT It consists of propelling shaft, usually made of stainless

steel and bronze impellers. Water enters the pump through a screen located between motor and the pump

ELECTRIC MOTOR The motor is enclosed in steel case filled with light oil of

high dielectric strength. A mercury seal placed directly above the armature prevents oil leakage or water entrance at point where the drive shaft passes through the case to the impellers.

COMPONENTS

Major components are- Motor Impeller Discharge pipe Pump shaft Cable

OPERATING PRINCIPLE OF SUBMERSIBLE PUMP

A submersible pump pushes water to the surface by converting rotary energy into kinetic energy into pressure energy

This is done by the water being pulled into the pump: first in the intake, where the rotation of the impeller pushes the water through the diffuser. Produced liquids, after being subjected to great centrifugal forces caused by the high rotational speed of the impeller, lose their kinetic energy in the diffuser where a conversion of kinetic to pressure energy takes place.

From there it goes to the surface. This makes the pump move the liquid to greater distances as compared to other forms of pumping.

Click icon to add picture

ADVANTAGE,DISADVANTAGE & APPLICATION

ADVANTAGE Prevents pump cavitation . It never has to be primed . Ground-surface noise is eliminated. It is safe compared to other pumps. Efficiency is high.

DISADVANTAGE Operating parts are inaccessible and difficult to inspect The cost of submersible pump is higher than that of an ordinary pump If the pump lose its seals causing substantial damage to the unit

APPLICATION Draining sewage pumping, general industrial pumping and slurry pumping. residential, commercial, municipal and industrial water extraction. Deep well drilling, mine dewaterig & sea water handling

VERTICAL TURBINE PUMP

A vertical turbine pump is a vertical axis centrifugal or mixed flow type pump comprising of stages which accommodate rotating impellers and stationary bowls possessing guide vanes. These pumps are used where the pumping water level is below the limits of volute centrifugal pump.

CONSTRUCTION

It has three main parts

Pump Element: The pump element is made up of one or more bowls or stages. Each bowl consists of an impeller and diffuser.

Discharge Column: It connects the bowl assembly and pump head and conducts water from former to later.

Discharge head: It consists of base from which the discharge column, bowl assembly and shaft assembly are suspended.

COMPONENTS

Major Components are: Motor Bowls Impellers Line shaft Column pipe

WORKING PRINCIPLE OF VERTICAL TURBINE PUMP

Click icon to add picture turbine pumps have smaller diameter impellers with rows of numerous small vanes. These vanes re-circulate the fluid as it travels from the suction end to the outlet. Specifically, fluid enters at the edge of an impeller blade and is accelerated not only tangentially in the direction of rotation, but also radically outward into the casing channel by centrifugal force. As the fluid strikes the casing wall it is redirected back onto an adjacent blade (vane) where additional energy is imparted.

ADVANTAGE DISADVANTAGE & APPLICATION

ADVANTAGE Generates high head and high discharge pressure No priming is required Pump can be powered by an AC electric motor or IC engine Can be used where the water surface is below the practical limits.

DISADVANTAGE The initial and maintenance costs are higher No easy way to adjust performance Complications in the installation, checking and maintenance of this

pump Impeller requires regular adjustment to preserve high efficiency APPLICATION Water and irrigation supply Cooling water circulation in conventional and renewable power

stations

ADVANTAGES OF SUBMERSIBLE PUMP OVER VERTICAL TURBINE PUMP (VTP)

Pump House Requirements: A VTP motor is aboveground, it requires a pump house to protect it from weather and vandalism, as well as to suppress noise. On the other hand, a submersible system does not require a pump house at all. Its underground location reduces risk of damage from weather, vandalism, and accidents. In addition a submersible does not generate the noise like a VTP.

ADVANTAGES OF SUBMERSIBLE PUMP OVER VERTICAL TURBINE PUMP (VTP)

Continuing Maintenance: A VTP requires regular lubrication, packing, and shaft or impeller adjustments. This simply is not the case with a submersible. It is designed to spend its entire life under water with no additional maintenance.

Efficiency and Starting: In VTP the motor efficiency is lost due to frictional losses in the line shaft. These losses are typically one to two horsepower per 100 feet of depth and generally exceed the electrical losses in the drop cable for a submersible system. In a VTP installation the motor must not only moving the pump but also the entire drive shaft and its associated hardware. Submersible installations have a lower moment of inertia, which means faster and easier starting.

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