COMPONENTS OF STEAM TURBINE

1. Casing or Cylinder:

 It may be Barrel type casing or Split type casing

                a) Single shell casing

                b) Multiple shell casing

2. Rotor:

                a) Built up rotor

                b) Integral rotor

3. Blades:

                a) Impulse type blade

                b) Reaction type blade

These blades has three main parts:                                                         

                a) Aerofoil

                b) Root

                c) Shroud

4. Steam chest:

It is the portion in between turbine valves & rotor through which steam admission to the turbine takes place. 

5. Turbine valves:

These valves were mounted on the outer casing through which the steam is admitted to the steam chest. These are of two types:

                a) Stop valve

                b) Control valve

6. Bearing:

On which the rotor supported during rotation.

7. Labyrinths or Glands:

These are the seals provided to arrest the leakage losses.

8. Atmospheric relief valve or diaphragm:

This is a rupturing diaphragm made of lead sheet is provided on the LP turbine outer casing. This is allowed to rupture to avoid the over pressure at LP turbine exhaust. Also some times called LP diaphragm.

9. Turning gear device:

This is a device attached to the rotor, which allows the rotor to rotate at constant slow speed after stopping or before starting the machine. This is also called barring gear.

10. Governor or controller:

This is a main device plays a important role during operation of the machine.

11. Couplings:

This connects the different shaft of the different turbines, so that power can be added up to rotate the alternator.