- The diesel engine fuel injection piping is subjected to very high pressure, in the range of about 1200bar. Also, there is sudden increase and decrease of pressure which causes the fatigue in the material.
- Taking into consideration these two things it is necessary that the material and the manufacturing process of the piping should be such that it should be able to withstand the high pressure and fatigue.
- It is also of prime importance, from the point of view of safety of the ship and fire hazard, that the fuel pipe should not get cracked under these high pressures. In order to achieve these requirements, it is necessary to use fuel pump pipes made up of seamless, solid drawn tubes.
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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