PUMP OVERHAULING
Overhauling a pump involves a systematic process to restore its performance, ensuring efficient operation and extended service life.
We follow the step-by-step procedure below for Pump Overhauling.
1. Receiving and Initial Inspection
- Record the pump model, serial number, and specifications.
- Inspect the exterior condition for leaks, rust, or physical damage.
- Check for operational issues, such as abnormal noise, vibration, or reduced performance.
- Take photos for reference before disassembly.
2. Disassembly of the Pump
- Drain all fluids from the pump and disconnect electrical/mechanical connections.
- Carefully remove couplings, bearings, casing bolts, and impeller.
- Extract the mechanical seal, shaft, and wear rings.
- Label all parts and arrange them systematically for further examination.
3. Detailed Inspection of Components
- Shaft: Check for bends, wear, or scoring using a dial indicator.
- Impeller: Inspect for cracks, corrosion, or erosion.
- Bearings: Assess wear, pitting, and misalignment.
- Mechanical Seal: Check for leakage signs, face wear, and O-ring deterioration.
- Wear Rings: Examine for excessive clearance or scoring.
- Casing & Housing: Look for cracks, erosion, and corrosion.
4. Cleaning of Components
- Use chemical cleaning solutions or an ultrasonic cleaner for small parts.
- Scrub metal parts with degreasers and wire brushes to remove deposits.
- Clean impellers and casings thoroughly to remove scale and corrosion.
- Dry all components completely before further processing.
5. Replacement of Worn-Out Parts
- Replace bearings, seals, gaskets, O-rings, and worn wear rings.
- Install a new mechanical seal if the old one is damaged beyond repair.
- Replace the shaft or impeller if they are excessively worn or damaged.
6. Reassembly of the Pump
- Carefully reassemble the pump components in reverse order of disassembly.
- Ensure bearings and seals are properly lubricated before installation.
- Align the shaft and impeller correctly to avoid misalignment issues.
- Tighten all bolts and fasteners to the manufacturer’s torque specifications.
7. Final Inspection and Testing
- Rotate the shaft manually to check for free movement.
- Perform an air or hydrostatic pressure test for leak detection.
- Check for proper alignment between the pump and motor.
- Verify correct bearing preload and impeller clearance.
8. Commissioning and Re-installation
- Reinstall the pump in its original position.
- Ensure proper coupling alignment with the motor.
- Fill the pump with the recommended fluid and check for leaks.
- Start the pump and monitor for smooth operation, correct pressure, and temperature.
9. Documentation and Handover
- Record all overhaul activities, replaced parts, and test results.
- Provide a final inspection report for customer or maintenance records.
- Hand over the refurbished pump for operational use.