- Firefighting equipment ready at all times.
- Fire detectors and fire alarm in good working condition.
- CO2 total flooding system door is locked to prevent accidental actuation.
- Safety gear worn while working- safety shoes, helmet, overalls, safety goggles, ear mufflers, and gloves.
- Escape routes should be clearly marked.
- Proper working permits obtained before carrying any work on board; e.g. hot work permit, enclosed space entry permit.
- All lifting gears checked to be in good working condition.
- Safety lamps are used - never use a naked lamp.
- Co-ordination of work, so no chemical cleaning and hot work around boiler area is done at the same time.
- No transfer of oil carried out in dry dock.
- No boiler blow downs; in emergency, necessary notice given.
- Acetylene and oxygen bottles are properly stored and secured.
- Fire officer at site of work and extinguishers available.
- No unauthorized personnel or chemicals allowed on board.
- Ship properly grounded to shore earth.
- Fire line is always ready with 2 hydrants open if no hull work is carried out.
- Safety meetings should be carried out every morning before stating the work in dry dock.
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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