What Is the LW Vertical Sewage Pump?
The LW vertical sewage pump (also known as a LW vertical inline centrifugal pump or vertical pipe centrifugal pump) features a compact direct-coupled motor design with coaxial inlet and outlet ports of identical diameter. This structure allows the pump to be installed directly in-line with existing piping systems, eliminating the need for additional foundation construction or pipeline modifications, significantly reducing installation time and saving pump room space.
With an optimized hydraulic model and high-precision dynamic balancing, the LW series delivers smooth, low-vibration operation. The flow-path components are treated for corrosion and wear resistance, making them ideal for continuous transport of clean water and physically similar media. Combined with a high-performance mechanical seal, the pump ensures leak-free, efficient operation over extended service life.
Video Overview
Key Features & Benefits
Extended Service Life (≥12 Years)
Equipped with silicon carbide/tungsten carbide double-face mechanical seals and high-strength cast iron or stainless steel flow components, the pump resists wear, corrosion, and cavitation, extending service life by over 35% compared to standard horizontal centrifugal pumps.
Significant Energy Savings (15%–25% Reduction)
The optimized hydraulic model paired with an IE3 high-efficiency motor achieves ≥75% efficiency at rated conditions. When combined with variable-frequency drive (VFD) control, annual electricity costs are reduced by 15%–25%.
Reduced Maintenance Costs
The back-pull-out design with integrated drain and pressure-tap ports allows seal and impeller inspection without disconnecting inlet/outlet piping. A single technician can complete routine maintenance in under 1 hour, cutting labor costs by 50%.
Compact & Lightweight Design
The vertical direct-coupled configuration eliminates the coupling guard and heavy base plate, reducing overall weight by approximately 20% for the same flow and head specifications. This lowers floor-loading requirements and simplifies lifting and positioning.
Technical Specifications
| Parameter | Specification |
|---|---|
| Flow Rate Range | 7 – 800 m³/h |
| Head Range | 5 – 60 m |
| Motor Power | 0.75 – 90 kW |
| Speed | 1450 rpm / 2900 rpm |
| Outlet Diameter | DN50 – DN300 |
| Max. Working Pressure | 1.0 / 1.6 MPa |
| Max. Suction Lift | ≤ 8 m (requires priming) |
| Medium Temperature | -15°C to +120°C |
| Solid Content | ≤ 0.1% |
| pH Range | 6 – 10 |
| Noise Level | ≤ 65 dB(A) |
Available Configurations
- Flow rates from 7 to 800 m³/h
- Heads from 5 to 60 m
- Motor powers from 0.75 to 90 kW
- Rotational speeds of 1450 r/min or 2900 r/min
- Outlet diameters from DN50 to DN300
- Project-specific pipeline matching
Compliance & Certification
The LW vertical sewage pump is manufactured in strict compliance with GB/T 5657-2013 (Centrifugal Pump Technical Conditions, Class III) and JB/T 5294-2011 (Vertical Centrifugal Pump) standards. All units are equipped with IE3 ultra-high-efficiency motors compliant with GB 18613-2020 energy efficiency standards, supporting CE/UL certification. Stainless steel flow-pass components (304/316) meet GB 4806.9-2016 food-contact material standards.
Installation Guide
Pre-Installation Checks
- Foundation flatness: ≤ 2 mm/m. Reserve ≥ 400 mm clearance on all sides for maintenance.
- Medium temperature: -15°C to +120°C. Solid content ≤ 0.1%, pH 6–10.
- Max. working pressure: 1.0 / 1.6 MPa. Max. suction lift ≤ 8 m (requires priming).
Installation Steps
- Vertical alignment: Mount the pump vertically on a stable base or bracket. Use adjustable feet to ensure pump shaft verticality ≤ 0.5 mm/m to prevent seal wear.
- Pipe connections: Use flexible rubber joints at inlet and outlet. Never allow pipeline stress to transfer to the pump body. Install independent supports for both inlet and outlet lines.
- Wiring: Route the motor junction box outward. Secure cables along the pipe wall. Grounding resistance must be ≤ 4Ω.
- Pre-start check: Manually rotate the shaft 3 revolutions to confirm smooth, friction-free movement. Open the top vent valve, fill the pump casing with medium, confirm no air remains, then close the valve tightly.
- Rotation verification: Jog the motor to verify rotation direction (clockwise from motor end).
Commissioning
Prime and vent → Jog rotation check → No-load run for 5 minutes → Gradually open outlet valve to rated point → Record current, pressure, vibration, and bearing temperature data.
Application Scenarios
- Building Water Supply: High-rise zone boosting, residential water supply, fire pressure maintenance with 1.0/1.6 MPa configurations.
- HVAC Circulation: Central AC chilled/hot water loops, boiler water circulation, floor heating systems with low-noise operation (≤65 dB(A)) and VFD energy savings of 15%–30%.
- Industrial Process: Chemical/pharmaceutical/food & beverage clean liquid transfer with 304/316 stainless steel options meeting GMP hygiene standards.
- Cooling Water: Cooling tower circulation and industrial equipment cooling water boosting with corrosion-resistant design and high-temperature options (≤120°C).
Frequently Asked Questions
Q1: What is the advantage of the vertical inline design?
The LW vertical inline pump can be installed directly into existing piping without modifying the pipeline layout or pouring a new foundation. The coaxial inlet/outlet design (same diameter, same axis) makes it a true “drop-in” replacement, saving significant installation time and floor space.
Q2: Can this pump handle hot water?
Yes. The standard model handles media from -15°C to +120°C, making it suitable for hot water circulation in heating systems and industrial processes.
Q3: How often should the mechanical seal be inspected?
Under normal conditions, inspect the seal during quarterly maintenance. The back-pull-out design allows access to the seal and impeller without disconnecting any piping, making this a quick, single-person task.
Q4: What motor efficiency class does this pump use?
The LW series comes standard with an IE3 ultra-high-efficiency motor, compliant with GB 18613-2020. This delivers ≥75% efficiency at rated conditions and supports variable-frequency control for additional energy savings.
Why Choose Chaodun Pump?
Chaodun Pump delivers LW vertical inline centrifugal pumps that combine compact design, high efficiency, and long service life. Every unit undergoes 1.5× rated pressure hydrostatic testing, dynamic balancing verification, and performance curve validation before shipment. Contact us for technical specifications or a custom quote for your project.