Horizontal Centrifugal Pump
SLW Series for Water Supply, HVAC & Industrial Circulation
The SLW horizontal centrifugal pump is a single-stage, end-suction pump for clean-water supply, HVAC circulation, pressure boosting, irrigation and industrial water systems. Available across 8–1,400 m³/h with heads up to 127 m, it can be configured in cast iron, stainless steel, duplex stainless steel or bronze to match the required duty.
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SLW Series Technical & Selection Guide
SLW Horizontal Centrifugal Pump: Technical and Selection Guide
The SLW is a single-stage, single-suction horizontal centrifugal pump for clean-water transfer, building services, HVAC circulation, pressure boosting, irrigation and compatible industrial water duties. Its horizontal layout provides direct access to the motor, seal and hydraulic components for inspection and maintenance.
Series range, not one model: the figures below describe the overall SLW series envelope. Available combinations vary by pump size, speed, motor, material, seal and operating conditions. Final supply should be confirmed on an approved model-specific datasheet and Q-H curve.
Supplied Product Photography
SLW Series Product Reference Views
These images are taken from the supplied SLW product material. Motor, flange, casing, base and coupling details vary by size, material and approved project configuration.
Operating Envelope
SLW Series Technical Range
| Pump type | Single-stage, single-suction horizontal centrifugal pump |
|---|---|
| Flow | 8–1,400 m³/h* |
| Head | Up to 127 m* |
| Motor power | 0.18–160 kW* |
| Inlet / outlet size | DN 15–500 mm* |
| Frequency | 50 or 60 Hz configurations* |
| Listed voltage options | 220 / 380 / 460 / 480 / 660 V* |
| Liquid temperature | Up to 120°C*, subject to seal, material and working-pressure confirmation |
| Performance-chart speeds | 2960, 1480 and 980 r/min |
| Motor enclosure / insulation | IP55 / Class F, subject to the selected motor datasheet |
| Working pressure | Up to 1.6 MPa (16 bar)* |
| Material families | Cast iron; stainless steel 304, 316 and 316L; duplex 2205 and 2507; 904L; bronze, subject to model availability |
*Maximum figures are not all available in one pump configuration. Confirm performance, pressure, temperature, motor, material, seal and connection details for the selected model.
Construction and Operation
How the SLW Horizontal Centrifugal Pump Works
Liquid enters the impeller eye through the suction side. The motor rotates one impeller, increasing liquid velocity; the casing then converts part of that velocity into pressure and directs the liquid to the discharge. Because one impeller develops the head, the SLW is a single-stage pump. “Single suction” means liquid enters the impeller from one side.
The horizontal motor-and-pump arrangement gives service personnel direct access to the pump cover, mechanical seal and motor. The exact dismantling sequence, lifting points and pipework requirements depend on the selected model and installation.
Hydraulic assembly
Pump body, impeller and pump cover guide the liquid through the suction and discharge path.
Sealing components
Mechanical seal, deflector and plugs support leakage control, venting and service access.
Drive and installation
Motor, baseplate, direction plate and fastening bolts support alignment and installation.
Preliminary Model Screening
Horizontal Centrifugal Pump Performance Range
The supplied SLW hydraulic coverage chart groups model envelopes at 2960, 1480 and 980 r/min. Use it for preliminary screening only. Every pump size has its own Q-H curve and preferred operating region, so final selection must be checked against a model-specific curve.
Duty point
- Required, normal, minimum and maximum flow
- Total dynamic head at each point
Hydraulic checks
- Efficiency and absorbed power
- NPSHr versus available NPSH
- Preferred operating region
Configuration
- Correct 50 or 60 Hz curve
- Materials, seal and pressure
- Motor and control method
Appropriate Duties
Where the SLW Horizontal Centrifugal Pump Fits
Building Water Supply
Clean-water transfer and pressure boosting sized from actual demand, static lift and pipeline losses.
HVAC and Hot-Water Circulation
Chilled-water, cooling-water and compatible hot-water circulation, subject to temperature, seal and material review.
Irrigation and Distribution
Water transfer for irrigation and distribution networks when the duty falls within the selected model curve.
Municipal Clean-Water Duties
Urban water supply and drainage duties where the liquid and solids content remain within confirmed pump limits.
Fire-Protection Water Systems
Pressure-boosting duties only after the required codes, approvals, driver and control package are confirmed.
Compatible Industrial Liquids
Transfer of clean water and compatible non-corrosive, low-solids liquids after material and seal review.
Do not select the SLW for abrasive slurry, sewage solids, seawater or aggressive chemicals without a project-specific hydraulic, material and seal review.
Project Reference
Mambu Branco Water Supply Expansion
The Mambu Branco integrated water-supply expansion addressed insufficient intake capacity and seasonal pressure on the regional network. The works included new intake facilities, large pumping stations and approximately 66 km of water-supply pipelines.
Pump scope: vertical single-stage pumps, vertical two-stage pumps and horizontal centrifugal pumps operating as one integrated water-supply system.
Result: increased water-supply capacity and improved reliability during peak summer demand.
Liquid Compatibility
Material Options for the Pumped Liquid
Depending on model and duty, SLW configurations may be available in cast iron, stainless steel 304, 316 or 316L, duplex stainless steel 2205 or 2507, 904L and bronze. A material grade alone does not establish chemical compatibility.
Selection should consider liquid composition, chloride content, pH, concentration, temperature, solids and cleaning chemicals. Request a project-specific bill of materials identifying the casing, impeller, shaft-related parts, fasteners, mechanical seal and elastomers.
Selection Inputs
Information Needed to Select an SLW Pump
Hydraulic duty
- Required and variable flow points
- Total dynamic head
- Static lift and pipeline losses
- Suction pressure and elevation
Liquid and construction
- Liquid composition
- Normal and maximum temperature
- Density, viscosity and solids
- Materials, seal and pressure
Site and supply
- Pipe size and flange standard
- Voltage, phase and frequency
- Fixed speed or VFD
- Quantity, destination and standards
Order Confirmation
Documents to Confirm Before Order
Hydraulic documents
- Project-specific pump datasheet
- Selected Q-H curve with duty point marked
Construction documents
- Outline and connection drawing
- Wetted-material and seal schedule
Supply documents
- Motor electrical data
- Inspection or test documentation
- Installation and maintenance instructions
Performance and construction should be treated as confirmed only when they appear in the approved project datasheet, drawing and commercial offer.
Buyer Questions
Frequently Asked Questions
What is a horizontal centrifugal pump?
It is a centrifugal pump with the pump shaft and motor arranged horizontally. The SLW uses one single-suction impeller and is selected from the required flow, head, liquid and installation conditions.
How is an SLW different from a vertical inline pump?
The hydraulic principle can be similar, but the shaft and motor arrangement, equipment footprint, pipe layout and maintenance access differ. Select the layout that fits the site and approved duty.
Do the maximum flow and head belong to one SLW model?
No. They describe the overall series envelope. A model-specific Q-H curve and datasheet are required for the actual selection.
Can the SLW circulate hot water?
The supplied series information lists liquid temperatures up to 120°C, but the exact limit depends on the selected seal, materials and working pressure.
Which material should be used?
Material selection depends on liquid composition, chloride level, pH, temperature, solids and cleaning chemicals. Provide complete liquid data for review.
Can the SLW operate on both 50 Hz and 60 Hz?
Series configurations are listed for 50 and 60 Hz. Performance changes with rotational speed, so the correct model curve and motor data must be confirmed.
Is the SLW self-priming?
A standard centrifugal pump should not be assumed to be self-priming. Confirm suction conditions, priming method and available NPSH during selection.
What should I send for pump selection?
Send required flow, total head, liquid, temperature, suction conditions, voltage and frequency, material preference, quantity, destination and applicable project standards.
Engineering Selection
Send Your Duty Point for SLW Pump Selection
Use the enquiry form below and include the required flow, total head, liquid, temperature, site power, material preference, quantity and destination. You can also attach a duty sheet or project specification.