Masdaf – SPLT split-case pump with double suction
The SPLT split-case pump is a single-stage centrifugal pump with a horizontal split casing and double-suction. According to the Masdaf catalogue, the series has a flow rate ranging from 30 to 4,500 m³/h, a head ranging from 15 to 180 m, and a speed ranging from 1,000 to 3,600 rpm. The pump is designed for liquids with temperatures up to 110 °C and is used where large volumes need to be pumped at moderate head.
What does a horizontal chassis connector mean?
The casing is divided by a plane passing through the shaft axis. The upper half can be removed, giving full access to the rotor with its impeller, wear rings and bearing assemblies, without the need to disconnect the pipework or move the motor. The inlet and outlet flanges are aligned on the same axis, so the pump can be installed in a straight section without transition bends. For a stationary pumping station operating for decades, this is the main practical advantage of this design: scheduled maintenance does not require dismantling the pipework.
Why have a wheel with a double-sided entry?
The fluid is fed to the impeller from both sides. Due to the back-to-back configuration, the axial forces from the two halves of the impeller balance each other out, and the shaft does not require a unloading device. A second benefit is the increased total inlet cross-section: at the same flow rate, the inlet velocity is lower, so the series has a low NPSH and operates where suction head is limited. The catalogue specifically highlights the enlarged impeller inlet, which smooths the flow and reduces noise.
SPLT Technical Specifications
| Parameter | Value |
|---|---|
| Type | single-stage centrifugal pump, horizontal split casing, double-suction |
| Capacity | 30 – 4,500 m³/h |
| Pressure | 15 – 180 m |
| Rotational speed | 1000 - 3600 rpm |
| Suction flange | DN 100 – DN 500 |
| Discharge flange | DN 65 – DN 500 |
| Flange standard | DIN 2535 |
| Fluid temperature | up to 110 °C |
| Shaft seal | Standard soft packing with a water ring; mechanical seal — optional |
| Bearings | ball or roller bearings, self-lubricating or with grease, in a sealed housing |
| Drive | electric motor mounted on a common frame via a flexible coupling; a diesel engine is also an option |
| Certification | CE; TSE ‘Centrifugal Pump’, Classes 1 and 2 |
We determine the working pressure of the housing on a case-by-case basis for each specific order, in accordance with the manufacturer’s specification sheet.
How to interpret model codes
The notation is based on the following scheme SPLT 65 – 250, where SPLT is the series designation, the first number is the nominal diameter of the discharge flange in millimetres, and the second is the nominal diameter of the impeller in millimetres. In other words, the SPLT 65–250 has a discharge flange of DN 65 and an impeller with a diameter of 250 mm. With this logic in mind, the pump’s name on the nameplate immediately reveals both the connection type and the hydraulic size.
What materials are available for the flow-through section?
| Part | Standard | Options |
|---|---|---|
| Pump casing | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Gearbox | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Impeller | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Gland | GGG40 high-strength cast iron | AISI 304, AISI 316, CuSn10 bronze |
| Wear ring | CuSn10 bronze | GGG40, AISI 304, AISI 316 |
| Shaft | AISI 420 | AISI 304, AISI 316 |
| Bearing housing and cover | GG25 cast iron | — |
The standard version is designed for clean and process water. For more corrosive environments, the flow path is available in stainless steel; the bronze wear ring remains standard in all versions, as it is this component that bears the brunt of wear in conjunction with the impeller.
Where is the SPLT split-case pump used?
- water treatment, pumping stations and water distribution stations;
- water supply to residential and commercial buildings;
- the pumping of process fluids at industrial plants;
- treatment plants;
- power stations;
- shipbuilding and the mining industry;
- general oil refining processes;
- agricultural irrigation;
- fire-fighting stations.
How does the SPLT split-case pump differ from the YPSP fire-fighting series?
The design is the same: horizontal casing split, double-sided suction, flexible coupling on a common frame, and diesel drive is an option. The difference lies in the regulatory framework and the standards for which the pump is certified. The SPLT is an industrial version not tied to any fire safety standard, offering a wider choice of materials and operating at temperatures up to 110 °C. The YPSP NFPA is manufactured to NFPA 20, whilst the YPSP UL/FM is approved to UL 448 and FM 1311; both fire-fighting series are limited to 60 °C and are configured to meet the acceptance requirements for fire-extinguishing systems. If the facility is a water supply and sewerage system, a thermal power station or an irrigation system, the SPLT is used; if the system is commissioned in accordance with fire safety regulations, the relevant YPSP series is used.
Selection, supply and service from Steiner Ukraine
Double-suction pumps are selected based on the operating point on the performance curve for a specific model, whilst checking the NPSH margin — it is the cavitation margin that most often becomes the limiting factor in stations with low head. To carry out the calculation, Steiner Ukraine requires: the nature of the fluid and its temperature, the design flow rate and head, the geometry of the suction line and the fluid level at the source, the drive type and material requirements. Based on this data, we determine the SPLT model, agree on the materials for the flow path and the type of seal, and provide a specification. Spare parts — packing, gland assemblies, wear rings, bearings — are ordered using the pump designation on the nameplate.