Week 9

1) Checked the oxygen level as well as the lower explosive limit in the steam turbine condenser man hole.

2) Assisted the inspection performed on the the erosion level of the Low Pressure (LP) side of the Steam Turbine's interior metal surface.

3) Assisted the field technician for the daily power station reading measurement round.

4) Carried out the weekly test on the Black Start Diesel Generator and the Emergency Diesel Generator where both were start up and synchronized from the central control room.

Week 8

1) Performed normalization of the main steam line and feedwater pump valves. The purpose was to carry out N2 preservation and wet preservation of the HP drum 11 and 12 as well as the feeedwater tank.

2) Fire Fighting weekly test was carried out. At the same time the fire fighting pump performance test for the diesel and the electrical pump was carried out.

3) Performed an inspection on the Generator Forced Cooling System (MPR) Plate Heat Exchangers. The port filters of the heat exchangers were removed and cleaned. This was done to improve the efficiency of the heat exchanger.

Week 7

1) Explanation on the superheated steam generation by Mr. Fong Weng Toong as we walked around the Heat Recovery Steam Generator.

2) Pressurized the hydraulic oil used the operate hydraulic valves called actuators for the MAX and diverter dampers.

3) Entered inside the steam turbine condenser. Located inside the condenser is the condenser tubes and the condenser hot well. This where the exhaust steam turns into condensate.

4) Drained the seawater by isolating the 12PAC pump by closing the suction valve. This was done to allow repair works on leaking pipes to be carried out.

5) Drained out the lube oil from the MAX base tray which collects oil that leaks out of the system.

6) Learned the mechanism of cavitation in a pump. Cavitation is caused when the Net Positive Suction Head (NPSH) required is more than the NPSH available. This can prove to be detrimental to pump as it can cause damage & severely decrese its performance.

Week 6

1) Isolated the fuel gas pipeline from the gas forwarding skid for GT11 & GT12 and purging with nitrogen gas was done to remove the remaining fuel gas inside the pipes.

2) Tested the air quality and checked the oxygen level in the GT12 combustion chamber manhole. The Lower Explosive Limits (LEL) was also identified to check the presence of any explosive gases.

3) Preservation of the Auxiliary Boiler was done to preserve the auxiliary boiler from corrosion attack. Purging with nitrogen gas, which is a chemically inert gas, is done to remove oxygen.

4) Entered inside the GT12 exhaust diffuser and the bypass stack. Witnessed the GT12 minor inspection.

5) Replaced the solenoid valve for the steam turbine's bypass control valve.

6) Watched the opening of the Inlet Guide Vanes inside the GT12 air intake. This is done to control the air mass flow into the compressor.

Week 5

1) Read the Plant Course Manual on the Gas Turbine design features. The GT is a single hollow shaft machine of single casing design. The Heat Recovery Steam Generator is a simple convection forced - circulation drum - type generator and generates superheated steam in a high-pressure section.

2) Read the Plant Course Manual on the Circulating Water System (PA). One of the several tasks of this system is to covey seawater as a coolant to the steam turbine condenser, thus discharging condensation heat.

3) Performed the Pump Performance Test. Flow rate (liters/sec) & velocity (m/s) of seawater in the inlet pipeline to the plate heat exchangers of the PCB is measured at various valve openings using an ultrasonic flowmeter.

4) Meeting with the Station Manager, Mr. Ong Eng Hock.

Week 4

1) Gas Turbine 12 (GT12) start-up was performed. Condensate level of the steam turbine is also monitored after the Heat Recovery Steam Generator (HRSG) is put into operation to complete the combined cycle mode.

2) Read the Operations & Maintenance Manual on the Fixed Water System (SGC).

3) Prepared Power Point presentation slides on the Fire Fighting Spray Deluge System Pressure Monitoring. The objective is to determine the factors that influence the system pressure.

4) Assisted the data entry of the Hazard Identification Risk Assessment & Risk Control (HIRARC) into the computer system.

5) Assisted the technician for daily power plant reading measurements round.

6) Refueled diesel into the Black Start Diesel Generator and the Emergency Diesel Generator.

7) Recorded the Air Intake Differential Pressure for GT11 & GT12 at the filter house. This is done to ensure that the filter cleanliness is optimum.

Gas Turbine

A gas turbine, also called a combustion turbine, is a rotary engine that extracts energy from a flow of combustion gas. It has an upstream compressor coupled to a downstream turbine, and a combustion chamber in-between. Energy is added to the gas stream in the combustor, where fuel is mixed with air and ignited. In the high pressure environment of the combustor, combustion of the fuel increases the temperature. The products of the combustion are forced into the turbine section. There, the high velocity and volume of the gas flow is directed through a nozzle over the turbine's blades, spinning the turbine which powers the compressor and, for some turbines, drives their mechanical output. The energy given up to the turbine comes from the reduction in the temperature of the exhaust gas. Energy is extracted in the form of shaft power, compressed air and thrust, in any combination, and used to power generators.