Presentation prepared by student

2. VARIOUS SUCTION MODE &
FORCE MODE PUMPS USED IN
BANGLADESH

3.  Mirajum Munira Priya
Student ID: 1107063
Faria Mehzabin Prema
Student ID: 1107046
Meshkatun Zannat
Student ID:1107081

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

5. CENTRIFUGAL PUMP
A 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.

8.  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.

9. 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.

10. 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.

11. 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.

12. Major components are-
 Motor
 Impeller
 Discharge pipe
 Pump shaft
 Cable

13. 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.

14. 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

15. 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.

16. 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.

17. Major Components are:
 Motor
 Bowls
 Impellers
 Line shaft
 Column pipe

18. 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.

19. 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

20. 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.

21. 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.

22. THANKS