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The photo shows a pump that overheated and failed when the circulating relief valve didn't open and the pump continued to run without discharging water. The circulating relief valve allows the pump casing to stay cool by allowing the discharge of water at a low rate from the pump when it is not moving water.NEVER allow a fire pump to run unattended. Even though many critical functions of a fire pump are monitored for proper operation, the installations are designed to run to self destruction. While a diesel fire pump controller may provide a supervisory signal if the oil pressure is low or the engine temperature is too high, the pump continues to run. The only thing that automatically shuts a diesel fire pump down is if the engine runs out of fuel or if the engine over speeds to the point that the engine is damaged. Whenever a "pump running" signal is received someone should be dispatched to the pump immediately to tend to the operation of the pump.
© Hughes Associates,Inc. 2012