- ULSD contains low level of lubricity.
- Natural lubricity is provided by oxygen and nitrogen compounds aromatics ,hydrocarbons and sulphur.
- Refining process reduces these chemicals.
- Engine and fuel oil system rely heavily on lubricity for proper operation.
- Insufficient lubricity leads to premature failure of wear related fuel system components including fuel pump and injector.
- ULSD is hygroscopic fuel .This means it absorbs water from atmosphere
- Water weaks havac in diesel fuel system causing corrosion and failure of metal componets such as fuel tanks, pumps and injectors .
- Water leads to microbial contamination which results in plugged fuel lines and filters
- In cold climate water freezes resulting in reduced power and total engine shutdown.
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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