Pump Casing Rib Curvature to Prevent Crack Leakage

The rib is designed with a curved outer edge instead of a straight edge. This curvature redistributes the stress distribution pattern, moving the stress concentration point from the connecting portion between the rib and suction hydro structure to a different location on the rib. The curved geometry smoothly transitions stress flow, preventing sharp stress concentrations that would initiate cracks at the vulnerable connecting portion.

Instead of uniformly thickening the entire pump casing wall, the invention segments the reinforcement function into a specific rib structure. The rib is strategically positioned and dimensioned to provide localized reinforcement where needed, while the rest of the casing maintains its original thinner wall thickness. This segmented approach achieves the required strength without the penalty of overall weight increase.

The pump casing employs local quality enhancement through the rib structure. Rather than making the entire casing thick, the rib is positioned at specific locations where reinforcement is most needed to withstand water pressure. This localized quality improvement allows the majority of the casing to remain thin and lightweight, while critical areas gain the necessary strength to pass water-pressure resistance tests.