During drafting operations, how many inches of water must be above a traditional strainer for a pump to operate at rated capacity?

In drafting operations, it is essential to maintain a specific amount of water above a traditional strainer to ensure proper pump performance. For a pump to operate at its rated capacity, there needs to be at least 24 inches of water above the strainer. This ensures that the pump can effectively draw water without introducing air into the system, which can cause cavitation and reduce efficiency.

The requirement of 24 inches provides a buffer to prevent the strainer from becoming exposed, especially in dynamic conditions where water levels may fluctuate. Insufficient water depth can hinder the pump’s ability to maintain a consistent flow rate, affecting the overall effectiveness of the water supply operation.

Other options suggest lesser amounts, such as 12, 18, or 30 inches, which may not adequately ensure optimal performance or might even impede the operation as they do not meet the established standards for effective drafting.