What effect does high turbidity in boiler water have?

High turbidity in boiler water refers to the presence of suspended solids, dirt, and other impurities that can significantly affect boiler operation. The correct choice highlights that high turbidity can lead to overheating and potential damage to boiler tubes, which is a critical concern for safe and efficient boiler operation.

When boiler water contains high levels of turbidity, it can inhibit the proper circulation of water within the system, resulting in localized heating. The impurities can settle on heating surfaces, which can act as insulators and create hot spots. As these hot spots develop, they lead to the risk of overheating. This overheating can cause metal fatigue, ultimately resulting in tube failures or even catastrophic boiler breakdowns.

Therefore, managing water quality, including keeping turbidity levels low, is essential to maintain the efficiency and longevity of boiler components, as well as ensuring operational safety.

The other options reflect incorrect assumptions or consequences of high turbidity. It does not improve heat transfer efficiency; in fact, it has the opposite effect. High turbidity does not reduce the overall pressure within the boiler; rather, it can lead to operational problems and inefficiency. Lastly, it certainly does not increase the lifespan of boiler components, as the presence of impurities can accelerate wear and damage.