On a vessel fitted with a coil-type, forced-circulation, water-tube, oil-fired auxiliary boiler, what is the most practical way of determining if the inside surface of the coil is excessively scaled with hard scale deposits?
• Effect of scale deposits on heat transfer and fluid flow in boiler tubes • What changes first in operation when a coil-type boiler’s water passages start to restrict • Which readings (pressure, flow, visuals) are continuous, easy to monitor, and reflect internal restriction
• Think about what scale inside a narrow coil does to water flow and pressure, even if temperature and firing rate stay the same. • Which instrument or system on this type of boiler would show a change during normal operation without needing to shut down or open the boiler? • Which option would realistically be impractical or impossible to do accurately while the boiler is in service on a vessel?
• Identify which option reflects a dynamic change in operation as tubes become restricted. • Eliminate any method that would require the boiler to be opened, cooled, or disassembled for routine monitoring. • Focus on the device whose pressure reading would change directly due to increased resistance to flow in the coil.
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