most commonly used type of braking systems used in railway wagon

1. Presentation on:
“Pneumatic Breaking System in Railway
Wagon”
Presented by:
ROHITH KUMAR
4SN17ME080

2. CONTENTS:
INTRODCTION:
 Brake
 principle of braking system
 braking system in railway wagon
Pneumatic braking system
 vacuum braking system
 working
 Air braking system
 working

3. INTRODUCTION:
BRAKE:
A Brake is a device by means of which
frictional resistance is applied to a moving
machine member, in order to retard or stop the
motion of a machine.

4. PRINCIPlE Of BRAKE
Any moving system has energy known as Kinetic
energy, which needs to be removed from the system in
order to stop the system.
 The simplest way of doing this is by
converting kinetic energy into heat energy by
applying Brake.

5. Braking system in Railway
Wagon:
Pneumatic braking system
Electrodynamic braking system
Mechanical braking system
Eletromagnetic braking system

6. Pneumatic braking
system in Railway
Wagon

7. Pneumatic Braking System in
Railway Wagon
Generally many countries use Pneumatic braking
system.
Braking system which uses air as fluid is known as
Pneumatic Braking System.
Pneumatic brake is a type of friction brake for
vehicles in which compressed air pressing on piston is
used apply pressure on brake pad to stop the train

8. Classificationof Pneumatic Breaking
System
 Vacuum brake
 Air brake
 Twin pipe Gradated Release Air Braking System
 Single Pipe Graduated Release Air Braking System

9. Vacuum Braking System:

10. Brake Released Brake Applied

11. Limitations of Vacuum Brake
system
Brake cylinder takes longer time to release after each
application of brakes because of single train pipe.
Vacuum brakes are not suitable for high speed train
the maximum pressure available for brake application
is only atmospheric pressure.
The practical limit on the degree of vacuum
attainable means that a very large brake piston and
cylinder are required to generate the force necessary
on the brake blocks.

12. Air BrAke SyStem:
Brakes applied with the help of air
pressure are called air brakes. And the
system actuated to apply this
phenomenon is called as air braking
system.

15. Schematic diagram of air brake
on release mode

16. schematic diagram of air brake on
Application mode:

17. Twin Pipe Graduated Release
Air Braking system

18. • Compressed Air Pressure in Main Reservoir
860-970 kPa
• Pressure in fully charged brake pipe
480–620 kPa (for freight trains )
760 kPa (for passenger trains)
• In normal braking, the pressure in the brake
pipe does not reduce to zero. If it does fall to
zero, (e.g., because of a broken brake hose)
an emergency brake application will be made

19. Single Pipe Graduated Release Air
Breaking System:

20. Advantages of air brake over vacuum brake system:
More efficient and powerful braking.
Reduced braking distances- uniform braking effort
over the length of the train.
Brake power maintained over long runs there by
enabling end to end running.
Requires less time for examination thereby reducing
Pre-departure detention of trains for brake power
certification Vacuum brake trains takes 2 hours. Air
brake trains takes 1 hour.
lighter weight of brake equipments.

21. ConClusion:
vacuum brakes have extremely limited
applications because of longer function and
unsuitable for high speed trains.
Air brakes are efficient as compared to
vacuum brakes, however they require
considerable stopping distance therefore cannot
be used for emergency braking.