Masdaf – KMEV vertical multistage pump
The KMEV multistage pump is a vertical centrifugal pump with split-case stages, designed for an operating pressure of 40 bar. The series has a flow rate of 30 to 300 m³/h, a head of 30 to 190 m, and a speed of 1,500 to 1,800 rpm. The pump is not self-priming and operates with clean or slightly contaminated liquids at temperatures ranging from 0 to 110 °C.
Why do we need steps, and why is the axis vertical?
A single stage provides limited head. To achieve 190 m, the stages are connected in series: each subsequent stage increases the outlet pressure of the previous one. In KMEV pumps, the stage housings are detachable, so the number of stages is selected to suit the task, rather than using a ready-made, fixed set. The vertical axis solves another problem — space: a multistage pump is long, and when laid horizontally it takes up a length of over a metre, whereas when positioned vertically it fits within the area of its own flange. The manufacturer’s catalogue explicitly cites operation in confined spaces as an advantage of the series.
How to interpret model codes
The notation is based on the following scheme KMEV 100 – 6, where KMEV is the series name, the first number is the nominal diameter of the discharge flange in millimetres, and the second is the number of stages. In other words, the KMEV 100–6 has a DN 100 discharge flange and six stages. The nameplate clearly shows both the connections and the hydraulic configuration of the pump.
KMEV Technical Specifications
| Parameter | Value |
|---|---|
| Type | vertical multistage centrifugal pump, non-self-priming, with separable stage casings |
| Working pressure | 40 bar |
| Capacity | 30 - 300 m³/h |
| Pressure | 30 – 190 m |
| Rotational speed | 1,500–1,800 rpm |
| Suction flange | DN 125 – DN 150 |
| Discharge flange | DN 100 – DN 125 |
| Flange standard | DIN 2535 |
| Fluid temperature | 0 – 110 °C |
| Impellers | single-flow, closed, dynamically balanced, with the option of machining to the operating point |
| Balancing the axial force | wear rings and balancing holes on the engine-side of the wheel |
| Bearings | 3300 C3 double-row radial-thrust ball bearings on the discharge side, a plain bearing on the suction side |
| Drive | electric motor via a flexible coupling |
| Certification | CE; TSE ‘Centrifugal Pump’, Classes 1 and 2 |
Which seal should I choose based on the ambient temperature?
The manufacturer’s catalogue distinguishes between two versions. The standard version features a gland box without cooling or a mechanical seal, suitable for temperatures up to 90 °C. The optional version features a standardised water-cooled mechanical seal, suitable for temperatures up to 140 °C. However, the specified temperature range for the series itself on the manufacturer’s website is listed as 0–110 °C; therefore, for operation above 90 °C, the seal type and the actual upper limit must be agreed with Masdaf on a case-by-case basis for each specific order.
What materials are available for the flow-through section?
| Part | Standard | Options |
|---|---|---|
| Suction and discharge casings | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Stage housing | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Impeller | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Diffuser | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Gland | GGG40 high-strength cast iron | AISI 304, AISI 316, CuSn10 bronze |
| Shaft and shaft sleeve | AISI 420 | AISI 304, AISI 316 |
| Gearbox | GG25 cast iron | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Bearing housing and cover | GG25 cast iron | GGG40 |
The standard version is designed for fresh water. For soft, demineralised or chemically active water, the flow-through section is supplied in stainless steel — this applies in particular to boiler feedwater, where the water has been treated and is corrosive to cast iron.
How to position the pipes during installation
In the standard configuration, the discharge casing is located at the top, on the motor side, whilst the suction casing is at the bottom, on the opposite side. The suction and discharge flanges can be oriented in various positions at 90° intervals, allowing the pump to be integrated into the existing pipework without the need for adaptors. The manufacturer can supply other mounting options to order.
Where are KMEV pumps used?
- drinking water treatment plants and water distribution systems;
- increasing pressure in high-rise buildings and at industrial sites;
- water treatment and filtration plants;
- boiler feedwater and the condensate system;
- sanitary facilities and washing facilities;
- shipbuilding, the mining and energy sectors;
- irrigation;
- central heating systems.
How does the KMEV differ from other multi-stage series from Masdaf?
KMEV — a vertical design with detachable stage housings, rated for 40 bar with a flow rate of up to 300 m³/h. The Masdaf range also includes horizontal multistage series and compact pumps for lower flow rates. The choice between them depends on three factors: the required pressure, the available floor space, and ease of maintenance. The KMEV is the best choice where pressure is high, space is limited and flow rates are moderate — a typical scenario for a pump room in a high-rise building or a boiler room.
Selection, supply and service from Steiner Ukraine
A multistage pump is selected not only on the basis of its operating point, but also on the number of stages: the same operating point can be achieved through various combinations of the number of stages and impeller diameter, and the efficiency within the operating range depends on this choice. To carry out the calculation, Steiner Ukraine requires the following: the nature and temperature of the fluid, the design flow rate and head, the suction pressure, material requirements and any height restrictions in the premises. Based on this data, we determine the KMEV model with the required number of stages, agree on the materials and type of seal, and provide a specification. Spare parts — impellers, diffusers, shaft sleeves, seals and bearings — are ordered using the pump designation on the nameplate.
