Troubleshooting for Dalian Pump Accessories

Troubleshooting Guide for Dalian Pump Parts

As core fluid conveying equipment, pump parts directly affect system efficiency and stability. Widely applied in chemical, water conservancy and energy industries in Dalian, proper troubleshooting cuts downtime and maintenance costs. Key troubleshooting and solutions for major parts are listed below.

 1. Impeller Faults: Wear and Unbalance

The impeller converts mechanical energy into fluid kinetic energy. Common faults: wear, cavitation, unbalance and cracks.

Inspection

1. Visual check: Examine pits, edge abrasion and cracks after disassembly.

2. Clearance measurement: Normal radial clearance ranges 0.1-0.5mm; excessive gap reduces efficiency.

3. Balance test: Severe vibration indicates unbalance causing bearing overload.

 Solutions

- Replace severely cavitated or over-10% worn impellers.

- Repair minor wear via surfacing welding and rebalance.

- Ensure qualified fitting clearance during installation.

2. Sealing System: Leakage Prevention

Two main types: mechanical seal and packing seal, mainly faulty in leakage and overheating.

Mechanical Seal

- Causes: worn seal face, aging O-ring, failed spring.

- Inspection: Normal leakage ≤5 drops per minute; check scratches, deformation and spring tension.

- Solutions: Replace worn rings and seals, adjust spring compression.

Packing Seal

- Causes: packing wear, loose gland.

- Inspection: Excess leakage or overheating means defective packing.

- Solutions: Fasten gland evenly or adopt heat & corrosion resistant packing.

3. Bearing System: Support and Transmission

Fault symptoms: overheating, abnormal noise and vibration.

 Inspection

1. Temperature: Normal bearing temperature ≤70℃; stop operation above 80℃.

2. Sound: Hum noise means insufficient lubrication; metal friction sound refers to bearing wear.

3. Vibration: Abnormal vibration over 4.5mm/s suggests unbalance or misalignment.

 Solutions

- Supplement lithium grease, fill 1/2-2/3 of bearing cavity.

- Replace damaged bearings with identical models.

- Correct shaft misalignment with dial indicator.

 4. Coupling & Transmission Components

Common faults: misalignment and elastic part damage.

 Inspection

1. Misalignment: Radial runout ≤0.05mm, axial gap ≤0.1mm.

2. Elastic part: Check cracks and abrasion of rubber buffers.

 Solutions

- Adjust unit position with gaskets or laser aligner.

- Renew damaged elastic components.

 5. Pump Casing & Pipeline Fittings

Main faults: casing cracks, flange leakage and valve jamming.

Inspection

1. Detect seepage and pressure drop for casing cracks.

2. Check gasket aging and loose bolts for flange leakage.

3. Sticky switch implies worn valve core or medium crystallization.

### Solutions

- Weld minor cracks; replace severely damaged pump casing.

- Install heat & corrosion resistant PTFE gaskets.

- Clean or replace faulty valves.

 6. General Inspection & Daily Maintenance

 Quick Inspection Steps

Visual check for leakage and loose parts; listen for abnormal noise; test temperature, inlet & outlet pressure and flow rate.

Maintenance Tips

- Monthly inspection on seal and bearing lubrication.

- Quarterly filter cleaning against particle invasion.

- Annual overall overhaul and alignment calibration.

Conclusion

Adopt observation, listening, measurement and analysis methods to fix pump part faults. Regular maintenance extends service life and ensures stable operation. Cut off power and release pressure before repair; engage professionals to avoid secondary damage.