What is the maximum allowed height of the water surface above the centerline of the pump intake during fire apparatus service testing?

The maximum allowed height of the water surface above the centerline of the pump intake during fire apparatus service testing is 10 feet. This limit is established to ensure optimal pump performance and to mitigate the risk of cavitation, which can occur if the pump has to draw water from a depth that is too great relative to its design. Maintaining this height helps ensure that the intake is adequately submerged and allows the pump to function efficiently without straining its components, which could lead to operational issues or damage. Understanding this aspect is essential for maintaining the integrity of the pump and ensuring the reliability of the fire apparatus during emergency situations.