Complete Installation Guide for LC Series Long-Shaft Deep Well Pumps
The LC Series long-shaft deep well pump is a vertical pump designed for deep well water extraction, widely used in power plants, water supply systems, agricultural irrigation, and municipal engineering. This comprehensive installation guide covers proper setup procedures for your LC deep well pump, ensuring reliable operation in water supply applications.
What is an LC Long-Shaft Deep Well Pump?
The LC long-shaft deep well pump, also known as a vertical long-shaft deep well pump or deep well pump, is a specialized vertical pump designed for extracting water from deep wells. Unlike submersible pumps, this long-shaft pump features the motor and pump installed above ground level, with a long drive shaft transmitting power to the impeller located in the well. This design allows for easier maintenance and monitoring while providing reliable water extraction from depths up to 250 meters.
Key Features:
- Vertical long-shaft design with motor above ground
- Single or multi-stage centrifugal impellers
- Copper bearing support for shaft stability
- Radial runout controlled within 0.15mm
- Optional oil-lubricated closed drive system
- Multiple material options: ductile iron, 2Cr13, 304, 316, 316L, 416 stainless steel
- Flow range: up to 1200 m³/h, Head range: up to 250m
Technical Specifications
| Parameter | Specification |
|---|---|
| Flow Rate (Q) | Up to 1200 m³/h |
| Head (H) | Up to 250m |
| Medium Temperature | ≤80°C |
| Solid Content | ≤0.01% (by weight) |
| pH Range | 6.5-8.5 |
| H₂S Content | ≤1.5 mg/L |
| Well Requirement | Straight, no |
Typical Applications
The LC long-shaft deep well pump is suitable for various water extraction scenarios:
- Power Plants – Cooling water supply and boiler feed water
- Steel Plants – Process water and cooling systems
- Mining Operations – Dewatering and water supply
- Chemical Industry – Process water extraction
- Fire Protection – Fire water supply systems
- Water Plants – Municipal water supply from deep wells
- Agricultural Irrigation – Large-scale irrigation water supply
Pre-Installation Checklist
Before installing your LC long-shaft deep well pump, verify these requirements:
1. Well Inspection
- Verify well diameter matches pump specifications (minimum well diameter specified in model)
- Ensure well is straight with no severe bending
- Check well depth and water level
- Verify water quality meets pump requirements (temperature, solids, pH, H₂S)
- Inspect well casing for damage or obstructions
2. Site Preparation
- Ensure level, solid foundation for pump base
- Verify adequate space for maintenance access
- Check electrical supply matches motor specifications
- Prepare discharge piping support structures
- Ensure proper drainage around well head
3. Equipment Inspection
- Inspect pump components for shipping damage
- Verify all parts match order specifications
- Check shaft for straightness and damage
- Inspect impellers and bowls for defects
- Verify bearing condition and lubrication
Installation Procedures
Step 1: Base Preparation
- Install pump base on level concrete foundation
- Ensure base is perfectly level (use precision level)
- Tighten anchor bolts to specified torque
- Verify base can support pump weight plus dynamic loads
- Install vibration isolation pads if required
Step 2: Pump Column Assembly
- Lower pump column sections into well carefully
- Connect each section with proper gaskets and bolts
- Install drive shaft sections with couplings
- Ensure shaft alignment throughout assembly
- Maintain shaft radial runout within 0.15mm
- Install bearings at specified intervals
Step 3: Bowl and Impeller Installation
- Lower bowl assembly to correct depth below water level
- Install impellers in correct sequence and orientation
- Adjust impeller clearance per manufacturer specifications
- Install suction screen to prevent debris entry
- Verify bowl assembly is centered in well casing
Step 4: Discharge Head Installation
- Install discharge head on top of pump column
- Connect discharge piping with flexible coupling
- Install pressure gauge and isolation valve
- Install check valve to prevent backflow
- Ensure piping is independently supported (no weight on pump)
Step 5: Motor and Drive Connection
- Mount motor on pump base
- Connect motor shaft to drive shaft coupling
- Verify motor rotation direction (counterclockwise when viewed from top)
- Check motor alignment with drive shaft
- Install motor guards and safety devices
Step 6: Electrical Connections
- Connect power supply to motor control panel
- Install overload protection and motor starter
- Connect grounding system
- Install phase monitoring relay
- Test all electrical safety devices
Step 7: Pre-Startup Checks
- Manually rotate motor shaft – should turn freely
- Check all bolts and connections are tight
- Verify lubrication levels in bearings
- Ensure discharge valve is closed
- Check motor rotation direction with momentary start
Commissioning Procedures
Initial Startup
- Start motor with discharge valve closed
- Check rotation direction immediately (counterclockwise from top)
- Monitor motor current – should be within nameplate rating
- Listen for unusual noise or vibration
- Gradually open discharge valve
- Monitor discharge pressure and flow rate
- Verify pump operates at design point
Performance Verification
- Record suction pressure, discharge pressure, and flow rate
- Verify pump operates at or near best efficiency point
- Check motor current does not exceed nameplate rating
- Monitor bearing temperature (should be stable)
- Verify no unusual vibration or noise
Installation Requirements for Special Conditions
Deep Well Applications (>100m)
- Use multi-stage bowl assembly for required head
- Install additional shaft support bearings
- Consider oil-lubricated closed drive system
- Verify well straightness is critical
- Use stainless steel components for corrosion resistance
High Temperature Applications (>60°C)
- Use high-temperature bearing materials
- Install cooling system for motor
- Consider thermal expansion in shaft alignment
- Use appropriate gasket materials
- Monitor temperature continuously
Corrosive Water Applications
- Select appropriate material (316L stainless steel for high chloride)
- Install cathodic protection if needed
- Use corrosion-resistant bearings
- Increase maintenance frequency
- Monitor water chemistry regularly
Common Installation Mistakes to Avoid
1. Misaligned Shaft
Mistake: Not maintaining shaft alignment during assembly
Solution: Use precision alignment tools, check runout at each section, maintain within 0.15mm
2. Incorrect Impeller Clearance
Mistake: Not adjusting impeller clearance per specifications
Solution: Follow manufacturer clearance tables, check with feeler gauges
3. Inadequate Well Straightness
Mistake: Installing in well with severe bending
Solution: Survey well before installation, use smaller pump if well is crooked
4. Pipe Weight on Pump
Mistake: Allowing discharge piping weight to rest on pump
Solution: Install independent pipe supports, use flexible coupling
5. Insufficient Submergence
Mistake: Not setting pump deep enough below water level
Solution: Calculate required submergence, add additional pump column if needed
Frequently Asked Questions
Q: What is the minimum well diameter for LC pumps?
A: The minimum well diameter is specified in the pump model number. For example, 400LC requires a minimum 400mm well diameter. Always allow 25-50mm clearance between pump and well casing for proper operation.
Q: How often should I lubricate the bearings?
A: For oil-lubricated systems, check oil level monthly and change oil annually. For grease-lubricated bearings, re-grease every 500 operating hours or per manufacturer schedule. Always use recommended lubricant type.
Q: Can I install this pump in a crooked well?
A: LC pumps require relatively straight wells. If well has severe bending, either repair the well or select a smaller diameter pump. Excessive well deviation causes shaft wear and vibration.
Q: What causes excessive vibration in deep well pumps?
A: Common causes include: shaft misalignment, bearing wear, impeller imbalance, well deviation, or operating off design point. Check shaft runout, inspect bearings, verify impeller clearance, and ensure proper submergence.
Q: How do I prevent sand damage to the pump?
A: Install proper suction screen, ensure pump is set below sand level, consider sand-resistant materials (stainless steel), and maintain proper flow velocity to keep sand in suspension.
Need Help with Your LC Deep Well Pump Installation?
Chaodun Pump has extensive experience manufacturing LC long-shaft deep well pumps for industrial and municipal applications. Our engineering team provides installation supervision, commissioning assistance, and operator training to ensure your water supply system operates reliably.