- Drain down the entire charge into the double bottom tank through the dumping valve.
- When the tank is empty, open the manhole door which located one on top and other on side.
- Make force ventilation by blower fan through the manhole door at least 24 hrs.
- Then check the tank atmosphere by Davy’s safety lamp.
- If the flame burns clearly, the tank atmosphere is free from explosive or fatal gas.
- Enter into the tank and clear the sludge and wipe out with cotton rags. During entering the tank ventilation must be provided continuously.
- One competent person must stand near the entrance to keep on wa
- Use spark proof torch and lamp. Naked light and smoking not allowed in the vicinity
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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