Maintenance of Deep Well Pumps

Maintenance of Deep Well Pumps

(1) Daily Maintenance (Daily / Weekly)

Operation status monitoring

Key parameter records: flow rate, pressure (investigate deviations exceeding ±5%, possibly due to impeller wear or pipeline blockage), motor current (shut down if exceeding 10% of rated value);

Abnormal judgment: Unusual noises may indicate a foreign object stuck in the impeller (including sand wells requiring filter screen inspection). Reduced water output could be due to pipe scaling (corrosive water tends to scale, requiring regular flushing).

Simple maintenance operations

Filter cleaning: Rinse the filter weekly (2-3 times per week for the sand well) to prevent particles from entering the impeller;

Cable Inspection: Check for any damage to the wellhead cables (salt spray removal is required in coastal areas to prevent corrosion);

Control box inspection: Remove dust and ensure the protection device functions properly (regularly test the sensitivity of the water shortage protection).

(2) Regular maintenance (monthly / quarterly / annually)

monthly

1. Test the motor insulation resistance (≥2MΩ);  2. Check for leaks at the pipeline connections;  3. Measure the outlet efficiency (if attenuation >10%, troubleshooting is required)

Stainless steel pump body: Wipe the surface to remove water stains (to prevent corrosion from chloride ion accumulation); Plastic pump body: Check for deformation (special attention required if water temperature exceeds 35°C)

every quarter

1. Clean the impeller and flow path (disassemble and inspect the impeller wear for sand-containing wells);  2. Replace the mechanical seals (use nitrile rubber for clean water conditions, fluorocarbon rubber for corrosive water);  3. Refill the motor chamber with clean water (for submerged motors, distilled water must be used in coastal areas to prevent chloride corrosion)

High chromium cast iron impeller: Check the wear (replace if thickness reduction >5mm); Bronze impeller: Inspect for cavitation pits (pay special attention to high-head pumps)

Every year

1. Overall hoisting of the pump body, comprehensive disassembly and inspection (impeller, seals, bearings);  2. Replacement of aged cables (especially in coastal areas to prevent salt spray corrosion);  3. Re-test water quality and adjust maintenance plans (e.g., upgrade to 316L material if chloride levels rise)

Special alloy impellers: Conduct non-destructive testing (e.g., inspect Hastelloy impellers for cracks).  Composite pump bodies: Check for coating detachment (FRP materials require recoating with anti-corrosion layers)