A script written during my apprenticeship

The working of the steam turbine is very simple. Turbine is of two kind one is impulse and other one is reaction turbine both give rotational output.

Now the question rises what is happening inside the turbine which give rotate the shaft. Let us take a simple real example in our life.

The fan which us air. If the high pressure air is allowed to impinging on the blade the fan will rotate and hence energy will convert from mechanical to electrical.

Same thing is happening inside the steam turbine in which there is a blade mounted on the shaft which can be  rotate. And high pressure is provided through nozzle(diverge).

And the fluid is steam which is impinging on the blade.

Steam have very high enthalpy and with pressure having usually 30 bar is inlet from the nozzle ring which is fixed. There the no pressure drop and when the travel through the blade the a little bit pressure will drop. And so on.

A rough info during my apprenticeship

1. The spindle valve will be order from marine workshop (PNSC). It will be construct of  M/S. The dimension will be provide when ordering.
2. case hardening advantages are ; long life of metal, realibility, can withstand with long fatigue.etc. it is done by several methods ( nitriding, induction hardening, flame hardening, carbodizing,  and nitriding is most commonly used). Example of component are bearing journal, gudgeon pin, shaft.
3. The importance of maintaining the water level in a boiler to prevent the boiler from dehydration. This water is consuming up as steam is producing. So a constant water level is necessary for production of steam at a constant rate. If the water level is drop significantly. The fracture of plate and bending of tube may occur. If the water level is to rise significantly the thermal shock can be happened. steam will not be saturated or we can say that the output of the steam dryness will be effect.
4. reason of using pure water in boiler is to prevent the formation of  ……slag. To have minimum no. of chlorides, phosphate, carbonate.
5. precaution are gas free the vicinity, check any dangerous gas with explosimeter, electric fan is used for free circulation of air. Other wise the person may fatal, ……………..
6. when taking a watch the main point that will be checked as following.

·        Boiler is running normal.

·        Economizer/exhaust gas boiler is running normal.

·        Aux. Generators are running normal.

·        Main engine is running normal

·        Check the level of diesel oil(service tank), fuel oil(service tank), lub oil, fresh water (check also which side port or starboard is on consume)

·         Check that the log book is maintained in the previous watch.

·        And confirm form previous watch officer that every thing is running normal.

7. smoke detector work on principle that smoke can scattered the light. Thus as shown in the figure the photocell is located in another compartment with opaque restriction between the light and photocell. When smoke come, the light will scattered and fall on the photocell. Where it is amplified, and the bell will ring. It can be tested by smoke of a cigarette or butane.
8.