Why Use Split-Case Pumps?

Split case pumps are a type of centrifugal pump where the casing is divided into two distinct chambers, either horizontally or vertically. The pump casings seal off the internal components from the outside while maintaining fluid pressure and preventing leakage. Unlike end suction pumps, where the suction, discharge nozzle and casing are in one chamber, split case pumps come apart easily to allow access to their internal parts, which makes maintenance a breeze.

Split-case pumps have an impeller with bearings on both sides. This means the impeller is firmly planted during excessive movement or vibration, which makes them more efficient than frame-mounted pumps. Considered to be the workhorses of industrial and municipal applications, split-case pumps are more expensive than end-suction or vertical inline pumps, and are generally not as flexible as vertical turbines. However, when you professionally install and operate a split-case pump, they are one of the most durable, efficient, and dependable pumps, providing decades of service.

Types of Split Case Pumps

Split case pumps can be vertical or horizontal, depending on how the casing is split into the two chambers relative to the impeller. The suction and discharge nozzles are on either side of the bottom half of the casing, while the impeller is located on a shaft between two bearings, offering support on either side.

Vertical Split Case Pumps

Vertical split case pumps have a minimal footprint compared to other pumps with similar capacities. However, they are not so popular as they tend to have lower efficiency. Vertical split cases are suitable for transporting high-pressure, high-temperature fluids, which means they’re commonly found in industries such as oil and gas, HVAC systems and municipal water systems, among others.

Horizontal Split Case Pumps

Horizontal split case pumps are most common as they provide higher efficiencies (above 90%), making them ideal for pumping low viscosity fluids like water at low to medium pressure. They are stable at varied speed and suction orientations, which means they are well suited to municipal pumping stations and cooling towers, where water is required at constant pressure and the pump needs to work for long periods at a time.

Benefits of Split Case Pumps

Split case pumps are more costly and not as flexible as standard pumps. However, their reliability and performance gives them an edge. Their in-between-bearings design also means they can work for extended periods without needing regular maintenance.

With a double suction impeller that can suck fluid in from both sides of the impeller instead of just one side (single-suction), it dramatically reduces loads on the bearings, offering excellent NPSH values.

Split-case pumps are a more balanced, durable, and reliable machine than other pumps. With robust bearings and the maintenance friendly design of their casing, they’re the choice of many municipalities and industrial facility.

Choosing a split-case pump

However, deciding on a split-case pump can be difficult. Does it need to handle high or low pressure, work in single-stage or multi-stage or have a horizontal or vertical split? Do check out our range of horizontal split-case pumps online.

If you have any questions about split-case pumps and which one you should be using, give Vissers Sales Corp., a call on 1-800-367-4180 (toll-free). Our experts are on hand to help you choose, install, maintain, and monitor a variety of equipment. And to answer questions about things you’ve previously tried gone wrong.