DX (Double Suction Heavy-Duty Vertical)

Visually inspect impeller surfaces, vane edges, and pump casing for pitting patterns, erosion texture, or material loss; check suction pressure/NPSH margin; listen for gravel-like noise during operation

Monitor seal chamber for continuous dripping vs. normal steady drips (packed pumps); check seal temperature on casing surface; inspect gland chamber for pitting, cracks, erosion, or corrosion; verify seal lubrication state during maintenance

Monthly: record bearing temperature and compare to baseline; listen for squeals/grinding sounds; monitor coupling alignment; test motor insulation resistance; check foundation bolt torque; verify lubricant color and viscosity for water contamination

Compare discharge pressure trend to baseline at fixed capacity; remove and visually inspect suction/discharge valve inserts for wear/cracks/erosion; inspect valve seat faces for pitting; monitor for 30 dB noise increase on accelerometer; test check valve one-way flow integrity

Inspect wear rings for damage and replace if necessary; examine impeller and casing wear patterns for symmetry issues; monitor motor current draw vs. baseline; check shaft straightness and coupling alignment; verify pump operates within rated capacity range