(a) A large motor vessel propeller
- Material: Typically made of a bronze alloy, such as Ni-Al bronze or aluminium bronze. These alloys are chosen for their strength, toughness, and resistance to corrosion in seawater.
(b) A centrifugal pump impeller
- Material: Often made of stainless steel for its strength, corrosion resistance, and ability to handle abrasive fluids. In some cases, cast iron or nickel-aluminium bronze may be used depending on the specific application and cost considerations.
(c) A sea water cooled heat exchanger tube
- Material: Typically made of titanium or cupronickel. Titanium offers excellent corrosion resistance and strength, but is more expensive. Cupronickel is a more cost-effective option with good corrosion resistance and heat transfer properties.
(d) A 300mm diameter sea water cooling pipe
- Material: Often made of fibreglass reinforced plastic (FRP), which is lightweight, corrosion-resistant, and relatively inexpensive. In some cases, steel or high-density polyethylene (HDPE) may be used depending on the specific requirements and pressure rating.
(e) A cylinder head of a small auxiliary engine
- Material: Typically made of cast iron due to its good machinability, heat transfer properties, and affordability. In some high-performance engines, aluminium or aluminium alloys may be used for their weight saving benefits.