Double Suction Pump

High-Flow Water Supply, Intake and Circulation Systems

The SLOW double suction pump is designed for high-flow transfer of clean water and compatible neutral liquids in municipal water supply, intake stations, cooling-water circulation and irrigation projects.

SLOW Double Suction Pump for High-Flow Water Transfer

Lower Load & Longer Service Life

The pump uses a double-volute casing and double-suction impeller to balance axial forces, reduce bearing loads, and ensure longer, more stable operation.

Stable Operation with Optimized Inlet Flow

The optimized inlet flow eliminates vortex formation, ensures uniform impeller suction, minimizes hydraulic losses, and provides smooth and efficient performance.

Reliable Sealing with Replaceable Wear Rings

The fully sealed shaft prevents liquid contact and corrosion, while replaceable wear rings protect the casing and reduce maintenance costs.

Flexible Installation & Reduced Footprint

The self-aligning pump cover and flexible inlet/outlet configuration allow easy installation and reduce space requirements.

Durable Construction for Demanding Conditions

The double-suction impeller minimizes axial forces, and high-quality components ensure durable, low-vibration, and reliable long-term performance.

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SLOW Double Suction Pump Series Range

Published series envelope for preliminary selection. Flow, head, port size, materials, speed and motor must be confirmed against the selected SLOW model curve and data sheet.

68–6276 m³/h

Flow range

Published SLOW series envelope

9–306 m

Head range

Final selection by Q-H curve

150–600 mm

Inlet / outlet size

Nominal inlet and outlet diameter

≤1.6 MPa

Pressure rating

Maximum rated working pressure

Certifications & Standards

SLOW Double Suction Pump Technical Range

SLOW SERIES TECHNICAL & SELECTION GUIDE

SLOW Double Suction Pump: Technical and Selection Guide

The SLOW is a horizontal split-case, double-suction centrifugal pump for high-flow clean-water and compatible neutral-liquid duties. Liquid enters both sides of the impeller, while the double-volute casing and double-suction impeller help balance hydraulic forces and reduce bearing load.

Series range, not one model: the figures below describe the published SLOW series envelope. Flow, head, port size, motor, speed, materials and pressure limits are not all available in one pump configuration. Final supply must be confirmed on a model-specific datasheet, approved Q-H curve and project documents.

68–6,276 m³/hPublished SLOW series flow range*

9–306 mPublished SLOW series head range*

0.18–160 kWMotor power range*

Up to 1.6 MPaWorking-pressure limit*

SUPPLIED PRODUCT PHOTOGRAPHY

SLOW Double Suction Pump Reference Views

Eight product images from the supplied SLOW material are shown below. Pump casing, motor, coupling, flange and base details vary by size and approved project configuration.

SLOW double suction pump drive-side assembly — Drive-side reference view of the complete SLOW pump and motor assembly.

SLOW double suction pump equipped assembly — Equipped SLOW pump-set reference with auxiliary piping arrangement.

SLOW double suction pump opposite-side view — Opposite-side view showing the horizontal motor and split-case pump layout.

SLOW double suction pump front connection view — Front connection reference view of the double-suction pump assembly.

Factory assembled SLOW double suction pump — Factory-assembled high-flow double suction pump-set reference.

Large split-case double suction pump casing for high-flow service.

Installed double suction pump set reference — Installed pump-set reference showing the driver, coupling and site pipework.

Large SLOW double suction pump casing reference — Large double suction pump casing reference for project-specific configuration.

OPERATING ENVELOPE

SLOW Series Technical Range

Pump type	Horizontal split-case, double-suction centrifugal pump
Flow	68–6,276 m³/h*
Head	9–306 m*
Motor power	0.18–160 kW*
Inlet / outlet size	150–600 mm*
Voltage / frequency	220 / 380 / 460 / 480 / 660 V; 50 or 60 Hz*
Liquid temperature	Up to 120°C*, subject to seal, material and pressure confirmation
Published speeds	740 / 990 / 1,480 / 2,960 r/min
Protection / insulation	IP68 / Class F*
Working pressure	Up to 1.6 MPa*
Material families	Cast iron; stainless steel 304, 316 and 316L; duplex 2205 and 2507; 904L, subject to model availability

*Maximum figures are not simultaneous guarantees for one model. Confirm the selected pump, motor, seal, pressure, temperature and material combination.

CONSTRUCTION AND OPERATION

How the SLOW Double Suction Pump Works

Liquid enters the impeller eye from both sides. The rotating impeller increases liquid velocity; the split casing and volute convert part of that velocity into pressure and guide the liquid to discharge. The double-entry flow path helps balance axial hydraulic forces, while the double-volute casing reduces radial loading for stable high-flow operation.

Hydraulic assembly

Double-suction impeller, split casing and double-volute passage distribute inlet flow and reduce axial and radial loading.

Shaft and sealing

The sealed shaft arrangement limits liquid contact, while replaceable wear rings protect major casing surfaces.

Bearings and service access

Lower hydraulic loading supports stable operation. The split casing provides access for inspection without disturbing connected pipework, subject to model design.

SLOW double suction pump structural drawing with numbered components — SLOW structural drawing supplied with the product material. Numbered parts and exact construction vary by selected model.

PRELIMINARY MODEL SCREENING

Double Suction Pump Performance Range

Use the published series chart to screen candidate pump sizes. Then verify the selected size on its model-specific Q-H curve, including efficiency, absorbed power, NPSHr and the preferred operating region.

SLOW double suction pump series hydraulic performance coverage chart — Published SLOW series coverage chart for preliminary model screening only.

Double suction pump model Q-H efficiency power and NPSHr selection example — Model-curve example showing head, efficiency, motor power and NPSHr checks. Do not use it as the curve for every SLOW model.

Duty point

Required, normal, minimum and maximum flow
Total dynamic head at every point
Static lift and pipeline losses

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 SLOW Double Suction Pump Fits

Municipal Water Supply and Drainage

High-flow clean-water transfer, intake stations and compatible drainage duties sized from the actual system curve.

Industrial Circulation and Process Water

Cooling-water and compatible process-water loops after liquid, solids, material and seal review.

Irrigation and Water Transfer

Irrigation, distribution networks and long-distance water transfer within the selected model curve.

Power and Utility Cooling Water

Cooling-water and utility circulation with confirmed NPSH margin, driver and control method.

Seawater Intake and Desalination

Only with project-specific hydraulic, corrosion, material, seal and cathodic-protection review.

Port and Marine Water Systems

High-flow compatible water duties where installation, vibration, corrosion and service access are confirmed.

Selection boundary: do not select the SLOW for abrasive slurry, sewage solids or aggressive chemicals without a project-specific hydraulic, solids, material and seal review.

PROJECT REFERENCE

Mambu Branco Integrated Water-Supply Expansion

The Mambu Branco project in São Paulo State, Brazil addressed insufficient intake capacity and seasonal pressure on the regional network. The works included new intake facilities, pumping stations and approximately 66 km of water-supply pipelines.

Mambu Branco water supply pumping station and pipeline project — Mambu Branco integrated water-supply network expansion, São Paulo State, Brazil.

LocationSão Paulo State, Brazil

OwnerState water and sewage company

Project scaleAbout 66 km of pipelines

Population servedApproximately 1.2 million

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.

Reference boundary: this project illustrates the application environment and integrated pumping context. The supplied case material does not identify a SLOW pump installation.

LIQUID COMPATIBILITY

Material Options for the Pumped Liquid

Depending on model and duty, SLOW configurations may be available in cast iron, stainless steel 304, 316 or 316L, duplex 2205 or 2507, and 904L. A material grade alone does not establish chemical compatibility.

Review 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 a SLOW Pump

Hydraulic duty

Required and variable flow points
Total dynamic head
Static lift and pipe losses
Suction pressure, level and elevation

Liquid and construction

Liquid name and full composition
Normal and maximum temperature
Density, viscosity and solids
Materials, seal and working pressure

Site and supply

Pipe size and flange standard
Voltage, phase and frequency
Fixed speed or VFD control
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
Efficiency, absorbed power and NPSHr

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 are confirmed only when they appear in the approved project datasheet, curve, drawing and commercial offer.

BUYER QUESTIONS

Frequently Asked Questions

What is a double suction pump?

A double suction pump feeds liquid to both sides of one impeller. This supports high-flow duties and helps balance axial hydraulic force.

How is it different from an end-suction pump?

An end-suction pump normally feeds the impeller from one side. A double suction pump feeds both sides and is commonly selected for higher-flow water-transfer duties.

Are 6,276 m³/h and 306 m available from one model?

No. They are limits of the overall SLOW series envelope. The selected model curve defines the available flow-head combination.

Why must NPSH be checked?

The pump NPSHr must be compared with the system NPSHa with an adequate margin to reduce cavitation risk.

Can a SLOW pump be used for seawater?

Only after liquid chemistry, chloride level, wetted materials, seal, fasteners and corrosion allowance are reviewed for the project.

Can the SLOW operate on both 50 Hz and 60 Hz?

The series material lists both frequencies, but the selected motor and model-specific performance curve must match the actual site supply.

Is the SLOW self-priming?

Do not assume self-priming. Confirm flooded-suction or priming arrangements, suction lift, air evacuation and NPSHa for the installation.

What should I send for pump selection?

Send flow points, total head, suction conditions, liquid data, temperature, power supply, material preference, quantity, destination and required standards.

Flow Rate：

Head:

68-6276m3/h

≤9-306m

Motor power:

Rated voltage:

0.18-160kw

220/380/460/480/660V

Frequency:

Diameters of the pump’s inlet and outlet：

50Hz/60Hz

150-600mm

Water temperature:

Speed:

≤120℃

740r/ min、990r/ min、1480r/ min or 2960r/ min

Protection class::

Insulation class:

IP68

Pressure Rating:

pump material:

≤1.6 MPa

Cast Iron, SS304/SS316/SS316L/
SS2205/SS2507/904L
/Bzone

Municipal Water Supply and Drainage Systems

Main pipelines for urban water supply

Secondary booster pump stations

Stormwater drainage and flood control systems

Sewage treatment plants (clean water transfer or reuse systems)

Industrial Circulation and Process Water

Cooling water circulation in power plants, steel mills, chemical plants

Paper mill water systems

Industrial neutral liquid or process water delivery

Agricultural Irrigation & Water Transfer Projects

Large-area farmland irrigation networks

Canal water lifting stations

Water diversion and inter-basin transfer projects

Power Generation and Utility Systems

Circulating cooling water in thermal or nuclear power plants

Hot water circulation systems in district heating networks

Seawater Desalination & Intake Systems

Coastal seawater intake stations

High-flow intake systems for pre-treatment and cooling

Port and Marine Infrastructure

Port drainage and water transfer systems

Onboard cooling water or ballast water systems for ships

Double Suction Pump Applications

Use this split-case double suction pump where your project needs high flow with stable hydraulic performance: municipal water supply and drainage, raw-water intake, industrial cooling-water loops, irrigation and water-transfer stations.

Municipal Water Supply and Drainage

For municipal water supply, drainage, raw-water transfer and intake-station duties where high flow and stable suction conditions are required.