What effect can water temperature exceeding 90°F (32°C) have on a fire pump?

When water temperature exceeds 90°F (32°C), it can lead to a decrease in capacity for a fire pump. Hot water has a lower density compared to colder water, which means it can introduce a variety of challenges to the pump's performance. Specifically, as water temperature increases, the viscosity of the water may change, potentially causing cavitation issues. This can limit the pump’s ability to move water effectively, leading to decreased capacity to deliver the required flow. Additionally, if the fire pump is not designed for high-temperature operation, it may struggle to maintain its intended performance levels, further contributing to reduced capacity. Understanding the relationship between water temperature and pump performance is crucial for ensuring that firefighting operations are conducted effectively and safely.