How can boiler capacity be increased effectively?

The ability to effectively increase boiler capacity can be understood by examining the design and structural aspects of boiler systems. When considering the addition of more sections to a cast iron boiler, it directly relates to increasing the heating surface area available for transferring heat from the combustion process to the water.

Adding more sections allows for a larger area to absorb heat, thus enabling the boiler to generate steam more efficiently and in greater volume. This enhancement effectively raises the boiler's capacity by providing more surface area for the necessary heat exchange required for steam production.

Conversely, increasing the fuel supply may lead to more heat generation, but without the appropriate adjustments in other parameters, it may also lead to inefficient combustion or operational issues. Lowering the pressure is generally not a method for increasing capacity; it typically results in reducing the boiling point of the water and thus can limit the steam production. Similarly, reducing the water level could lead to issues with overheating or damage to the boiler, as it would not support the necessary volume required for efficient operation.

Ultimately, the most effective method to increase the capacity of a boiler lies in the structural expansion of its heating surface, making the option involving adding more sections particularly valid.