- Make sure FO circulating pump is running, or else start pp
- Take sufficient water in boiler , ensure from gauge glass.
- Change over boiler control from auto to emergency mode.
- Start FD fan and open damper to max position . Run sufficient time ie, 3 minute ( pre purge) .After purging adjust the damper to minimum.
- Start pilot burner DO pump.
- Put ignition switch ON , spark will generate.
- Manually operate the solinoid valve to open DO to pilot burner
- Once pilot burner ignited , manually operate solinoid valve to open FO toain burner.
- After 10 second of main burner fired , put off ignitor and pilot burner.
- Adjust air fuel ratio manually by observing smoke
- Keep close watch on boiler
- Once boiler pressure reached to required pressure close the solenoid valve for main burner manually.
- Keep damper to max position for 1 minute
- Stop FD fan
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
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