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A horizontal split case pump is a horizontal centrifugal pump with a casing divided horizontally along the shaft centerline. It commonly uses a double suction impeller, allowing water to enter from both sides of the impeller. This design helps balance hydraulic forces while providing high flow capacity, stable operation, and convenient maintenance.
Horizontal split case pumps are widely used in municipal water supply, industrial water circulation, HVAC, irrigation, and fire protection systems where reliable, continuous water transfer is required.
A horizontal split case pump works on the centrifugal principle. Water enters the pump through the suction inlet and flows toward the impeller. As the impeller rotates, it transfers energy to the water, increasing its velocity. The casing then converts part of this velocity energy into pressure before the water leaves through the discharge outlet.
In a double suction design, water enters both sides of the impeller. The two flow paths help balance hydraulic forces and reduce net axial thrust, supporting smooth and stable operation.
The basic process is:
Water enters → Impeller rotates → Fluid gains velocity → Pressure increases → Water is discharged
Picture| Horizontal split case pump working principle
The main components of a horizontal split case pump include:
1. Split Casing – The casing is divided horizontally, allowing access to internal components for inspection and maintenance without normally disconnecting the main piping.
2. Double Suction Impeller – Water enters from both sides, helping balance axial hydraulic forces and making the design suitable for high-flow applications.
3. Shaft and Bearings – The shaft transfers power to the impeller, while bearings support the rotating assembly and help maintain stability.
4. Mechanical Seal or Packing – Prevents excessive leakage where the shaft passes through the casing.
5. Volute Casing – Collects water leaving the impeller and directs it toward the discharge outlet.
Horizontal split case pumps are commonly selected for large-volume water transfer applications, including:
(1) Municipal water supply: Water treatment plants and distribution systems.
(2) Fire protection: Supplying pressurized water to sprinkler and hydrant systems.
(3) HVAC: Chilled-water and cooling-water circulation in large buildings.
(4) Industrial processes: Cooling, process water, and general water transfer.
(5) Agricultural irrigation: Large-scale irrigation and water distribution.
(6) Power generation: Cooling-water circulation and other water transfer duties.
Horizontal split case pumps offer several important advantages:
(1) High flow capacity for large-scale water transfer.
(2) Stable operation with a well-supported rotating assembly.
(3) Convenient maintenance because of the horizontally split casing.
(4) Long service life when properly selected and maintained.
(5) Good hydraulic performance with suitable double suction designs.
However, they generally require more installation space and may have a higher initial cost than compact end-suction pumps. They are also primarily intended for clean water and other suitable low-viscosity liquids.
|
Feature |
Split Case Pump |
End Suction Pump |
|
Impeller |
Often double suction |
Usually single suction |
|
Casing |
Horizontally split |
Generally non-split |
|
Flow |
Often suited to high flow |
Low to medium flow |
|
Maintenance |
Convenient internal access |
Depends on design |
|
Footprint |
Generally larger |
More compact |
|
Typical use |
Large water systems |
General water supply |
Neither type is universally better. A horizontal split case pump is often preferred when high flow, continuous operation, and convenient maintenance are important, while an end-suction pump may be more suitable where space and initial cost are major considerations.
Before selecting a pump, consider:
(1)Required flow rate
(2)Total head
(3)Liquid temperature and characteristics
(4)NPSH conditions
(5)Operating hours and duty cycle
(6)Motor or diesel driver requirements
(7)Installation space and piping configuration
The final selection should be based on the manufacturer's performance curve and the actual operating conditions.
Purity's PSCM horizontal split case pump is designed for high-volume water transfer and stable continuous operation. Its horizontal split casing provides convenient access for inspection and maintenance, while the double suction hydraulic design supports reliable high-flow performance.
It is suitable for applications including municipal water supply, industrial water circulation, irrigation, and other large-scale water transfer systems.
Purity has 16+ years of manufacturing experience, a 60,000 m² manufacturing facility, and products supplied to 140+ countries.
It is a centrifugal pump with a horizontally divided casing, commonly using a double suction impeller for high-flow water transfer.
They are commonly used in municipal water supply, industrial circulation, HVAC, irrigation, power generation, and fire protection.
Not necessarily. Split case pumps are generally more suitable for high-flow, continuous-duty applications, while end-suction pumps are often preferred for more compact systems.
Start with the required flow rate, total head, liquid characteristics, NPSH, operating conditions, and installation requirements. The pump performance curve should then be used for final selection.
A horizontal split case pump is a reliable solution for applications requiring high flow, stable operation, and long-term water transfer. Its split casing simplifies maintenance, while the double suction design is well suited to high-flow applications.
For the right pump selection, always match the pump's performance to the actual flow, head, liquid, and operating conditions.
Need help selecting a horizontal split case pump? Contact Purity with your flow rate and head requirements for professional pump selection support.
