Water Pump Impeller and Seal Kit

Function

The impeller generates the pressure and flow rate required to deliver water to the spray manifold at design conditions. A worn or eroded impeller reduces pump head, lowering nozzle operating pressure and degrading the spray pattern, which reduces water distribution quality in the mixer and causes systematic under-moisturing of the WMM charge. The mechanical seal prevents water from migrating along the pump shaft to the motor bearing; seal failure causes shaft corrosion and motor winding moisture ingress — a high-cost consequence of a low-cost consumable reaching end of life without intervention.

Construction & quality

Impeller: cast from grey iron GG20 or bronze CuSn5Zn5Pb5 depending on site water chemistry, semi-open or closed radial-flow design to ISO 9906, vane profiles matched to the original pump casing to maintain the design head-flow curve. Each impeller is statically balanced before despatch. Mechanical seal: single-acting balanced mechanical seal, silicon carbide (SiC) rotating face, carbon stationary seat, FKM (Viton) secondary elastomers, 316 stainless spring. Seal face lapped to 0.0006 mm flatness. Kit contents: 1 impeller (machined and balanced), 1 mechanical seal assembly, 1 shaft O-ring, 1 casing gasket, installation instruction sheet.

When to replace

• Pump delivery pressure reduced more than 10% from commissioning baseline at the same motor speed
• Motor current increasing without a corresponding flow rate increase, indicating cavitation or vane erosion
• Water leakage appearing at the pump gland or shaft area
• Pump vibration or noise increase consistent with impeller imbalance from asymmetric erosion
• Seal face visibly wet or dripping during operation — an immediate replacement indicator