Construction and manufacturing of steam turbine

1. Submitted by :
Samim Akhatar
110106238
ME-D ,4th year
`

2. contents
 Definition of steam turbine
 Types of steam turbine
 HP (high pressure) steam turbine
 IP (intermediate pressure ) steam turbine
 LP (low pressure ) Steam turbine
 Over speed balancing of steam turbine
 Governing of steam turbine

3. Definition of steam turbine
A steam turbine is a device that extracts thermal
energy from pressurized steam and uses it to do
mechanical energy on a rotating output shaft.

4. Types of steam turbine
 HP(High Pressure ) Turbine
 IP(Intermediate Pressure )Turbine
 LP(Low Pressure) Turbine

5. HIGH PRESSURE STEAM TURBINE
• Steam first strikes on guide blades carrier and then HP rotor.
• Single flow casing
• Double shell casing
• Inner casing and outer casing
• Main steam pressure : 247 ATA
• Main steam temperature: 505 °C
• Number of stages 19

7. Rotor of HP Turbine
• It is made of mild steel.

8. Casing of HP Turbine
 There are two types of casing in HP steam turbine.
 Inner casing which is made of mild steel .
 Inner casing which covers rotor and protects leakage
 Outer casing cover whole rotor and inner casing arrangement .

10. Blades of HP Turbine
• Blades of HP steam turbine is made of steel alloys
• HP blades are the smallest blades of the steam turbine
• It is made on the special types of CNC machine which
works in 5-axises

12. Intermediate pressure turbine
 IP steam turbine is a double flow turbine
 Double casing (inner and outer )
 Steam pressure 54 ATA
 Steam temperature 593°C

13. Rotor of IP Turbine
 It is made of mild steel.
 IP rotor is in different shape.

14. Blades of IP Turbine
 IP blades are made of steel alloys.
 The shape of IP blades are different from the HP
blades.
 IP blades are larger than HP blades.

16. Casing of IP turbine
 There are two types of casing in IP turbine.
 Inner and outer casing .
 Casings are made of cast iron.

18. low Pressure Turbine
 Double flow.
 Double shell casing.
 Single admission from top half.
 Outer casing and condenser rigidly connected.

20. Rotor of LP turbine
 It is made of mild steel.
 It is heavier than HP and IP Turbine.

21. Casing of LP turbine
 Two types of casing inner casing and outer casing.
 Casing material is cast iron.

23. Blades of LP Turbine
• Blades are made of steel alloys.
• Smaller blades of LP turbine are made in three spindle
five axis CNC machine.
• Blades of LP is the largest among the other turbine blades.

24. Over speeding of turbine rotor
 Turbine rotor is tested on the over speed balancing
tunnel
 Balancing speed -180 to 3600 rpm
 Maximum caccum-1 torr
 Minimum vibration limit-1 micron

25. Governing system
 Governing system controls the steam flow to the
control signals.
 Steam turbine is equipped with high pressure
governing systems.

26. Conclusions
 Turbine is capable of long term reliable operation.
 Quick start up and load changes.
 Operational flexibility
 Continuous information on residual turbine life

27. THANK YOU