When conducting a service/performance test on a fire pump, the first test is the:

The first test conducted on a fire pump during a service or performance assessment is the no-load governed engine speed test. This test is essential because it establishes whether the engine is capable of reaching the necessary operational speed without any load. The importance of this test lies in ensuring that the engine can perform adequately under normal operating conditions before the pump is subjected to any operational loads, such as flowing water.

During the no-load governed engine speed test, the engine is run without engaging the pump, allowing it to reach its maximum governed speed. This speed should be consistent with the manufacturer’s specifications to ensure that the engine can deliver the required power and performance when the pump is operational. If the engine does not reach the correct governed speed, it may indicate issues such as fuel system problems or mechanical failures, which could impede performance in actual firefighting scenarios.

Other tests such as flow tests, pressure tests, and leak tests typically follow this initial assessment, as they are primarily focused on the pump's performance under load conditions or its structural integrity, rather than verifying engine capabilities.