Presentation - Bearing-thermal-power plant.pdf

Bearing for thermal power plant

1. BEARINGS FOR THERMAL
POWER PLANT
SHIVAJI CHOUDHURY

2. TYPE OF BEARINGS
Plain
Bearing
Plain bearing is simplest type of
bearing ,comprising just a
bearing surface and no rolling
elements
 also known as specific styles
bushing, journal bearings,
sleeve bearing, rifle bearing.
 These bearings are mostly suited
for high speed and high load
Rollingelementbearings
: A rolling-element bearing,
also known as a rolling
bearing,is a bearing which
carries a load by placing round
elements between the two
pieces. The relative motion of
the pieces causes the round
elements to roll with very little
rolling resistance and with
little sliding.

3. ROLLING ELEMENT
BEARING
BALL BEARING ROLLER BEARING
RADIALRADIAL THRUSTTHRUST
Deep grove
Ball bearing
Angular contact
Ball bearing
Self alignment
Ball bearing
Thrust
Ball bearing
Angular contact
Thrust Ball bearing
Cylindrical
Roller bearing
Taper
Roller bearing
Needle
Roller bearing
Cylindrical thrust
Roller bearing
Needle thrust
Roller bearing
Taper thrust
Roller bearing
Spherical thrust
Roller bearing
Spherical
Roller bearing

4. TYPES OF ROLLING BEARING
Ball bearing
Roller bearing
Ball bearings are generally better suited for higher speeds and
lighter load ,while roller bearings are used for relatively slower
speed and heavier load.
Cylindrical roller bearings utilize cylinders with approx
length/ratios ranging from 1.1 to 1.3
Needle bearings have rollers whose lengths are at least 4 times
their diameter.

5. BALL BEARINGS
oDEEP GROOVE BALL
BEARINGS
oThe most popular types
among rolling bearing.
oRadial load and axial load in
both directions can be
accommodated.
oSuitable for operation at
high speed with low noise
and low vibration.
ANGULAR CONTACT
BALL BEARINGS
Angular contact bearing are
common in applications
involving heavy thrust load.
single row angular bearings are
good for thrust in one direction
where double row angular
bearings can carry thrust in
either direction.

6. BALL BEARING
oSELF ALIGMENT BALL
BEARING
o There are two sets of balls which run on a
pair of grooves on the inner ring, with a
single outer-ring concave surface.
 This allows the bearing to accommodate
misalignment of the shaft.
 The self-aligning radial contact bearings
are a popular choice in applications
involving heavy load ,high speed and long
bearing span but they can not withstand
high thrust load.
BALL THRUST BEARING
 composed of ball bearing
supported in a ring, can be
used in low thrust applications
where there is little radial load.

7. CYLINDRICAL ROLLER BEARING
CYLINDRICAL ROLLER
THRUST BEARING
These bearings are suitable for
arrangements that have to
support heavy axial loads.
Can only accommodate axial
loads acting in one direction.
Use of this type of bearing is
limited to low rotation speed.
 CYLINDRICAL ROLLER BEARING
 Roller bearings typically have
higher load capacity than ball
bearings, but a lower capacity and
higher friction under loads
perpendicular to the primary
supported direction.

8. NEEDLE ROLLER BEARING
NEEDLE ROLLER THRUST
BEARING
These bearing can
accommodate heavy loads and
shock load.
 these bearings provide a high
degree of stiffness with in
minimum space
NEEDLE ROLLER
BEARING
These bearings are roller
bearing with cylindrical roller
bearing are small in diameter
,in spite of their low cross
section
Needle roller bearing have a
high load carrying capacity and
extremely suitable for bearing
arrangements where radial
space is limited .

9. TAPER ROLLER BEARING
TAPER ROLLER
THRUST BEARING
Tapered thrust bearings include
rollers that have conical
sections.
The bearing design ensures a
true rolling motion for
maximum bearing life and
load-carrying capacity.
TAPER ROLLER BEARING
Taper are generally used in
applications involving heavy
radial and thrust load.
The bearing is elements in
rolling surface and
raceways intersect at
common point on axis.
Taper roller bearing are
generally mounted in pair
,one facing the other

10. SPHERICAL ROLLER BEARING
SPHERICAL ROLLER
THRUST BEARING
Spherical roller thrust bearings
are ideal for applications where
conditions include heavy loads,
difficulties in establishing or
maintaining housing alignment
and problems with shaft
deflection.
SPHERICAL
ROLLER BEARING
Spherical roller bearings are
inherently self-aligning and
very robust. The two rows of
rollers make the bearings able
to carry heavy loads.
These bearings are designed
for heavy radial loads and
moderate thrust .

11. APPLICATION OF BEARINGS
S.NTYPE OF
BEARING
TYPICAL APPLICATION
1
RADIAL BALL
BEARING
ONE ROW OF
BALLS
ELECTRICAL MOTORS,CART AND LIGHT
TRAILER WHEELS,CONVEYER BELTS
PULLEY,GEAR BOX
2
RADIAL BALL
BEARING
TWO ROWS OF
BALLS
REDUCTION GEAR BOX
3
ANGULAR CONTACT
BALL BEARING
ONE ROW OF
BALLS
CENTRIFUGAL PUMPS,MACHINE
TOOLS,ENDLESS SCREW GEARBOX.
4
ANGULAR CONTACT
BALL BEARING
TWO ROWS OF
BALLS
ENDLESS SCREW REDUCTION
GEARBOX,CART WHEEL
5
SELF ALIGNMENT
BALL BEARING
LONG AND FLEXIBLE SHAFT ,LIGHT
SHELL

12. APPLICATION OF BEARINGS
S.NTYPE OF BEARING TYPICAL APPLICATION
6
CYLINDERICAL ROLLER
BEARING
LARGE ELECTRICAL MOTORS
7
TAPPERED ROLLER REDUCTION GEAR SHAFT,TRUCK WHEEL
8
SPHERICAL ROLLER
BEARING
LARGE INDUSTRIAL FANS,LARGE
REDUCTION GEAR BOX
9
BALL THRUST BEARING VERTICAL SHAFT THRUST BEARING
10SPHERICAL ROLLER
THRUST BEARING
HEAVY VERTICAL SHAFT
(FANS,TURBINE,GENERATOR)

13. JOURNAL BEARINGS
Journal bearings are commonly used in turbine, large fans,
large pumps that operate at high speed and temperature.
These types of bearings utilize hydrodynamics lubrication
,which means that load carrying surfaces of bearing are
separated by relatively thick film of lubrication that prevents
metal to metal contact.
Journal bearings are coated with layer of white metal or
Babbitt material ,serves as bearing surface.

14. TYPE OF JOURNAL BEARINGS
Cylindrical bearing.
Cylindrical bearing with grooves.
Elliptical lobe bearing.
Tilting pad bearing.

15. CYLINDRICAL JOURNAL BEARING
Cylindrical journal bearings are most
common type of type of journal
bearing used in industry.
It consists of cylindrical steel blocking
plate with Babbitt bonded to inside
bearing surface and the bearings are
generally split into two halves for
ease of assembly.

16. JOURNAL BEARINGS
JOURNAL BEARING THRUST BEARING
Thrust bearings keep the
rotor in its correct axial
position

17. TURBINE BEARINGS
500 MW KWU TURBINE
JOURNAL
BEARING
THRUST CUM
JOURNAL
BEARING
JOURNAL
BEARING
JOURNAL
BEARING

18. JOURNAL BEARING
(210 MW KWU L P TURBINE)

19. BEARINGS FOR FANS
Most power plant
fans utilize oil film
journal bearings
Roller bearings are
most commonly
used in smaller to
medium size fans.

20. BEARINGS FOR ID FAN

21. BEARINGS FOR FD FAN

22. BEARING FOR BFP
Journal bearing.
Thrust bearing.
JOURNAL
BEARING
THRUST
BEARING

23. BEARINGS FOR CEP
Vertical pumps
used for
condensate service
typically equipped
with sleeve
bearings.
Sleeve bearing for
condensate pumps
are typically design
for lubrication by
pumped fluid.

24. BEARINGS FOR AIR PRE HEATER

25. BEARINGS FOR BOWL MILL :XRP
I .Taper roller journal bearing
Journal Bearing (Upper & Lower) in sets H 242649 / H 242610 /
437549 / HH 437510 .
II. Vertical shaft bearing
a) Thrust bearing C-8091-C or T11000 or 577101 / T-811 / KT 811
b) Upper bearing 5256E / N1050 or 577089 / 326097 / HB -1-BC-
1B SKF Germany
(or) Timken TTL USA (or) 577089A-NR-513-FAG Germany /280 RU
92.
c) Lower bearing NU330 / A5240 WMR6 / 5240 SKF / 548408 FAG
III .Worm shaft bearing
a) Thrust bearing 454761, 541358A / 29438 / 29438 -CD-FAG
Germany or FAG 41358A
b) Radial bearing N334 FAG Germany (or) N334 EMI .

26. BEARINGS FOR AIR PRE HEATER
:500 MW
SNSERVICE BEARING
TYPE
BEARING
NO
1
PAPH SUPPORT BRG SPH ROLLER
THRUST BRG
294/560E
2
PAPH GUIDE BRG SPH ROLLER BRG 23060/CCK/C3/W33
3
SAPH SUPPORT
BRG
SPH ROLLER
THRUST BEARING
23072/CCK/C3/W3
4
SAPH GUIDE BRG SPH ROLLER BRG 23072/CCK/C3/W33

27. BEARING STANDARDS
AFBMA/ANSI (Anti friction bearing manufacturers
association/ American national standard institute)
STD -20 (RADIAL BEARING,EXECPT TAPERED ROLLER
BEARINGS)
STD-19.1(EXCEPT TAPPERED ROLLER BEARINGS)
ISO
ISO-492 (RADIAL BRG)
ISO -199 (THRUST BALL BEARINGS)
JIS
JIS-B 1524 (ALL TYPES OF BEARINGS)
DIN
DIN-620 (ALL TYPES OF BEARINGS)

28. THANKING YOU