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What is the typical composition of the castings employed in oil – fired boilers?
1. 70% Ni and 30% Cr
2. 50% Ni and 50% Cr
3. 90% Ni and 10% Cr
4. 80% Ni and 20% Cr

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Correct Answer - Option 2 : 50% Ni and 50% Cr

Explanation:

 Oil-fired boilers

  • An oil boiler works in a very similar way to a gas boiler.
  • The fuel, in this case, oil is ignited in the combustion chamber and a heat exchanger warms up cold water, either from the mains in a combi system or from a cold water tank in a conventional system.
  • In oil-fired boilers that use oil with high V and S, the parts are to be made with even higher Cr and Ni to resist ash corrosion in addition to temperature.
  • The casting employed typically contain
  • 50% Cr- 50% Ni
  • 60% Cr- 40% Ni

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