Turbocharger Parameter

Gas (turbine) side

Turbocharger

Sight glass (oil level)

Thermostat(oil temp safety)

Thermometer(oil temp)

Comp. side

Sight glass (oil level)

Thermostat(oil temp safety)

Thermometer(oil temp)

Rpm(speed)

On watch i seen the above things on gas  and compressor side.

A script on Woodward governor

Woodward governor

This electro-hydraulic type of governor is used on many machine eg. Steam turbine to run on a constant revolution per minute, diesel generator to run the alternator on a contant revolution per minute.

It has an output that is linked with the fuel pump for diesel generator and in steam turbine the output is linked with the valve

Maintenance of governor

Following are the point which is dealt with carefully

1. oil of governor is free of foreign particle
2. oil should be of same number that is used previously, eg. Viscosity must be matched
3. clean oil should be used to avoid the malfunctioning of governor.

Common feature incorporate in governor are following

1. speed droop
2. speed limit
3. load limit
4. compensator

speed droop is the time between the maximum load and no load

compensator is used to compensate the variable change for micro seconds.

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.  

Duties of a Trainee Engineer

In the name of Allah who is the most beneficient, the most merciful

Upon assignment to a ship, the trainee engineer should report to the second engineer who will introduce him to the chief engineer and master.

He will take a thorough round of the engine room with duty engineer o f the day, noting with care the general layout of the machinery, workshop, stores, making sure that he is familiar with bilge, sanitary, domestic fresh water and oils pumping/transferring arrangements. He will acquaint himself with all the routine followed by the ship and will apply himself diligently to his duties, carrying out the orders of the senior engineers/officers as desired or instructed.

He will be given work at the discretion of the 2nd engineer/duty engineer. He will ensure that machinery is kept in clean and serviceable condition. He may also be appointed as assistant watch keeper at sea or in port in any watch on discretion of the chief engineer/second engineer.

He shall inform anything unusual in working of machinery while on watch at sea/port to second engineer. He shall write log book neatly and tidily when asked to do so.

Trainee engineers on being assigned to a ship will be given a period of time for shipboard familiarization as required by regulation 1/14 (1.4) o f the STCW convention during which they shall get an opportunity to become acquainted with ships equipment, safety, environmental and emergency procedures. They shall also thoroughly read and understand the SMS/SOLAS safety and training manuals provided on board the vessel.

The trainee engineer shall familiarize himself with the filing/recording and or communicating the checks lists, reports.

WRITTEN BY : S/C ZEESHAN AHMED
LECTURED BY: CH. ENGR. YASEEN SAHAB
DATE: 11/AUGUST/2009
TIME: 1:49 PM