BEARINGS FOR THERMAL POWER PLANT

SHIVAJI CHOUDHURY

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

Rolling element bearings : 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.

ROLLING ELEMENT BEARING

BALL BEARING ROLLER BEARING

RADIALRADIAL THRUSTTHRUST

Deep groveBall bearing

Angular contactBall bearing

Self alignmentBall bearing

ThrustBall bearing

Angular contactThrust Ball bearing

Cylindrical Roller bearing

Taper Roller bearing

Needle Roller bearing

Cylindrical thrustRoller bearing

Needle thrustRoller bearing

Taper thrustRoller bearing

Spherical thrust Roller bearing

SphericalRoller bearing

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.

BALL BEARINGSo DEEP GROOVE BALL

BEARINGS o The most popular types

among rolling bearing.o Radial load and axial load in

both directions can be accommodated.

o Suitable 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.

BALL BEARINGo SELF 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.

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.

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 .

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

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 .

APPLICATION OF BEARINGSS.N TYPE 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

APPLICATION OF BEARINGSS.N TYPE 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

10 SPHERICAL ROLLER THRUST BEARING

HEAVY VERTICAL SHAFT (FANS,TURBINE,GENERATOR)

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.

TYPE OF JOURNAL BEARINGS

Cylindrical bearing.

Cylindrical bearing with grooves.

Elliptical lobe bearing.

Tilting pad bearing.

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.

JOURNAL BEARINGS JOURNAL BEARING THRUST BEARING

Thrust bearings keep the rotor in its correct axial position

TURBINE BEARINGS500 MW KWU TURBINE

JOURNAL BEARING

THRUST CUMJOURNALBEARING

JOURNALBEARING

JOURNALBEARING

JOURNAL BEARING (210 MW KWU L P TURBINE)

BEARINGS FOR FANS

Most power plant fans utilize oil film journal bearings

Roller bearings are most commonly used in smaller to medium size fans.

BEARINGS FOR ID FAN

BEARINGS FOR FD FAN

BEARING FOR BFP Journal bearing. Thrust bearing.

JOURNALBEARING

THRUST BEARING

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.

BEARINGS FOR AIR PRE HEATER

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 .

BEARINGS FOR AIR PRE HEATER :500 MW

SN SERVICE BEARING TYPE

BEARINGNO

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

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)

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