What is the minimum number of inches of water that should be present around the strainer in drafting operations?

In drafting operations, maintaining an adequate depth of water around the strainer is essential to ensure proper suction and prevent air from entering the pump. The correct answer indicates that a minimum of 24 inches of water is required around the strainer. This depth helps to facilitate consistent water supply and reduces the likelihood of pump cavitation, which can occur if the pump draws in air or if there is an insufficient water source.

Practically, having at least 24 inches of water ensures that even with fluctuations in the water level — whether caused by water usage or other factors — there is still enough coverage to maintain the integrity of the suction operation. Adequate water depth not only provides a reliable supply but also protects the strainer from becoming exposed or obstructed by debris, further ensuring operational efficiency.

Understanding this minimum requirement is critical for fire service pump operators, as it fundamentally affects the performance of the pump and the safety of operations during water supply challenges.