Masdaf – KMU multistage pump for low flow rates
Multi-stage KMU pump — horizontal centrifugal pump a split-case pump with detachable step housings, designed for operating pressure 25 bar. The series has a flow rate ranging from 1 to 16 m³/h, head — from 20 to 200 m, frequency Revolutions per minute — from 3,000 to 3,600 rpm. Standard impeller made from AISI stainless steel 304. The pump is not self-priming and belongs to the group industrial pumps Masdaf.
What applications is the KMU series designed for?
KMU is the smallest of the multi-stage ones Masdaf series: numbering starts from 1 m³/h, and the flanges have diameter from DN 25. This is a pump for point-load problems involving high pressure and low flow rate: increased pressure in the riser high-rise blocks, power supply for a single unit, washing line, filter flushing. General the principle, according to at what rate the pressure builds up, we discussed in the article About multistage pumps; here we shall focus on the fact that, How does KMU differ internally? rulers.
KMU Technical Specifications
| Parameter | Value |
|---|---|
| Type | horizontal, multi-stage a sectional centrifugal pump, not self-priming |
| Working pressure | 25 bar |
| Capacity | 1 – 16 m³/h |
| Pressure | 20–200 m |
| Rotational speed | 3,000–3,600 rpm |
| Suction flange | DN 25 – DN 50, DIN 2535 (PN 40) |
| Discharge flange | DN 25 – DN 50, DIN 2535 (PN 40) |
| Temperature liquids | 0 – 110 °C |
| Impeller | closed, single-threaded, dynamic balanced, AISI 304 stainless steel |
| Shaft | non-serrated, AISI 420 |
| Bearings | self-lubricating ball bearings on both sides, water-deflecting disc on the shaft |
| Rings depreciation | option |
| Drive | electric motor on a common mainly due to its elasticity coupling |
| Certification | CE; TSE ‘Centrifugal pump’, classes 1 and 2 |
The seal determines the upper temperature limit
The manufacturer specifies the following for the series Two types of shaft seal. Standard — non-cooled packing, permitted up to 90 °C. For higher temperatures is used mechanical seal without cooling, designed for a range of 90 to 110 °C. The rated limit for the series itself is 110 °C. Which type should you choose for a specific environment, we discussed in the article on seals for corrosive liquids.
What are the benefits of a stainless steel impeller?
In short Masdaf’s multi-stage series standard impeller material there is GG25 cast iron, and Stainless steel is an option. At KMU, however, it’s the other way round: The AISI 304 wheel is included as standard operation. For a pump that works with drinking water or treated water or is occasionally out of action, that is eliminates the problem of corrosion in flow-through systems parts without an additional charge for specialised items Manufacture. Housings made of cast iron, with the option of Order stainless steel products.
Smooth-running shaft and bearing assembly
The KMU shaft is manufactured without any shoulders by diameter. The result describes The manufacturer itself: assembly and disassembly Pump repairs are becoming simpler, because The parts are removed from the shaft without passing through sections of greater diameter. The shaft rests on self-lubricating ball bearings with on both sides, and to prevent water from getting into protects the bearing housings water-deflecting disc.
What materials are available for the flow-through section?
| Part | Standard | Options |
|---|---|---|
| Suction and pressure housings | GG25 cast iron | GGG40, AISI 304, AISI 316, bronze CuSn10 |
| Stage housing | GG25 cast iron | GGG40, AISI 304, AISI 316, bronze CuSn10 |
| Impeller | stainless AISI 304 steel | — |
| Diffuser | cast iron GG25 | GGG40, AISI 304, AISI 316, CuSn10 bronze |
| Shaft and shaft sleeve | AISI 420 | AISI 304, AISI 316 |
How to interpret model codes
The designation is based on the KMU scheme 40 / 8, де KMU — назва серії, перше число — nominal diameter of the discharge flange in millimetres, the second — the number stages. In other words, the KMU 40/8 has a discharge a DN 40 flange and eight steps.
Where are KMU pumps used?
- high-pressure water supply systems with low flow rate in residential and commercial buildings;
- distribution systems water and increased pressure in industrial facilities;
- stations water treatment;
- boiler fuel supply and condensate systems;
- health sector and washing systems;
- shipbuilding, mining and the energy sector;
- irrigation and irrigation;
- central systems heating.
How to choose between KMU, OMK and KME
Alland three — horizontal multi-stage Masdaf pumps, and they differ, first and foremost, in terms of consumption. The KMU delivers 1–16 m³/h at a head of up to 200 m, a pressure of 25 bar and DN 25–50 flanges. OMK series covers the mid-range: 5–180 m³/h, head up to 400 m, pressure 40 bar. KME Series the most powerful: 30–800 m³/h and a head of up to 480 m. The selection process begins with the calculated flow rate — it immediately eliminates two series out of three, and so on All that remains is to choose the number of stages to the required pressure. If the areas under There is a shortage of horizontal units; the same ones The problems are closed vertically performance — OMKV and KMEV.
Selection, supply and service from Steiner Ukraine
Steiner Ukraine — an official representative of Masdaf in Ukraine. Small expenses are particularly a noticeable difference between the pump, perfectly matched, and a pump ‘with 'in reserve': the second will operate on throttling and will wear out the seals faster. To work this out, we need the nature and temperature of the liquid, design flow rate and head, pressure at absorption, material requirements implementation and accommodation conditions. Based on this information, we we determine KMU size with the required number steps, agree on the type of seal and orientation pipes and provide the specifications. Installation, commissioning and Further maintenance includes our services; spare parts — wheels, casings stages, diffusers, shaft sleeves, rings wear parts, gaskets and bearings — Order according to the pump designation at nameplate.
