What is a key method to prevent thermal shock in a boiler?

Gradually adjusting water temperatures and boiler pressure is crucial in preventing thermal shock in a boiler. Thermal shock occurs when there is a sudden change in temperature that can cause materials, such as the boiler's metal components, to expand or contract unevenly. This uneven thermal expansion can lead to structural damage, such as cracking.

By gradually adjusting the water temperatures and boiler pressure, you allow the materials within the boiler to warm up or cool down at a controlled rate. This controlled process minimizes stress on the materials and helps maintain structural integrity. It reduces the risk of sudden thermal gradients that could contribute to thermal stress and eventual failure of the equipment.

In contrast, rapidly adjusting water temperatures can create sharp temperature differentials that increase the likelihood of thermal shock. Reducing the water level in the boiler might lead to overheating and damage to the boiler components, while implementing a constant high-pressure setting does not directly relate to managing temperature variations and can also increase the risk of other operational hazards. Therefore, the most effective approach to mitigate the risks associated with thermal shock is indeed to make gradual adjustments to both water temperatures and boiler pressure.