Why might a circulator, bypass, or booster cooling valve be opened during fire attack?

Opening a circulator, bypass, or booster cooling valve during a fire attack primarily serves the purpose of preventing the pump from overheating. When fire pumps operate under heavy load or for extended periods, the risk of overheating increases due to the high demand for water flow. By opening these valves, additional water is introduced into the system, allowing for better circulation and cooling around the pump. This circulation helps dissipate heat generated during operation, ensuring the pump operates efficiently and reliably during critical firefighting efforts.

The focus of fire operations is not merely on the flow of water or pressure within the system but also on ensuring that the equipment, particularly pumps that face significant stress, remains functional. Operational efficiency is paramount in firefighting, as malfunctioning equipment can severely hinder efforts to control a fire. Thus, managing pump temperature by utilizing cooling valves is an essential practice in maintaining performance and safety during fire attacks.