Pedrollo MK Vertical Multistage Pump 0.75-2.2 kW

Pedrollo MK pump explained

The Pedrollo MK is a series of compact, cost-effective vertical multistage centrifugal pumps rated up to 180 l/min (10.8 m³/h) and up to 114 m of head, with 11 bar working pressure. The inlet and outlet parts are cast iron and the impellers and diffusers are Noryl. Seven Star LLC supplies the MK in Oman and the GCC as an independent supplier in Muscat.

MK codes have two numbers separated by a slash, for example MK 5/7. The first number (3, 5 or 8) is the flow class and the second is the number of stages. MKm is the single-phase version and MK is the three-phase version. MK 3 runs from 3 to 6 stages and 0.75 to 1.5 kW, MK 5 from 4 to 8 stages and 0.75 to 2.2 kW, and MK 8 from 4 to 6 stages and 1.1 to 2.2 kW.

MK technical specifications

The values above come from the manufacturer technical data for the series. Individual models inside the MK range differ in power, head and current, so always confirm the exact model code before ordering.

How the MK works and what limits it

The highest head listed is 114 m for the MK 5/8 and 105 m for the MK 3/6. Operating limits are suction up to 7 m, liquid -10 to +60 °C, ambient up to +40 °C and IP X4. Because the shaft is vertical, the footprint is small, and the AISI 431 shaft runs in a Noryl stage stack that is light and corrosion resistant.

In a multistage centrifugal pump the liquid passes through several impellers in series, each stage adding head to the stage before it. The number of stages therefore sets the head, while the impeller width and motor power set the flow. The stage count is part of the model code, so a longer code number means a higher head at the same pipe size. Stable pressure, quiet running and a compact footprint are the practical benefits compared with a single-stage pump of the same head, and the pump gives its best efficiency when operated close to the middle of its curve.

MK models and performance data

The heads in this table are read from the first point of the manufacturer 50 Hz performance table and fall as flow increases, so use the full curve for the real duty point. Where a 60 Hz version is needed, ask us: the manufacturer states that 60 Hz motors are available on request for many models.

Where the MK fits: related Pedrollo pumps

For stainless steel construction at higher duty see the HT-PRO or the FCR 15-30. The VSP wraps MK hydraulics into a variable-speed unit (VSP-MK). Smaller jobs may use the PLURIJET or JSW.

Selecting a MK pump: checklist

• Choose flow class 3, 5 or 8 from the flow
• Choose the stage number from the head
• Check 11 bar working pressure and 60 °C liquid limit
• Single-phase MKm or three-phase MK
• Add a pressure tank and pressure switch for domestic boosting

Installing and maintaining the MK

Place the pump on a level, rigid base and tighten the anchor bolts evenly so the pump body is not stressed by the piping. Support the suction and delivery pipes independently, fit isolating valves on both sides to allow servicing, and add a non-return valve on the delivery side. Prime the pump fully before starting, because the stages must be filled with liquid to avoid running dry. Check the motor rotation on three-phase units, fit overload protection matched to the nameplate current, and make sure the pump never runs against a closed delivery for more than a short time. For pressure boosting, size the tank and pressure switch (or use a variable-speed controller) so that the number of starts per hour stays within the motor limit.

MK applications in Oman and the GCC

In the GCC the MK is typical for villa and small building boosting sets, garden irrigation and light commercial supply. Noryl stages are lighter and cheaper than stainless steel, so confirm the water does not contain sand and that the temperature stays below 60 °C, especially in rooftop tanks exposed to summer sun.

In hotels, hospital blocks and industrial sites around Muscat, Sohar and Salalah, multistage pumps run for long hours at steady pressure. Rooftop tanks can warm the water significantly, so check the temperature limit, and keep plant rooms ventilated. Chlorinated or desalinated supply water is normally acceptable only if the wetted material suits it, so state the water source on your enquiry.

Information to send with your MK RFQ

• Duty point: flow rate and required discharge pressure or head
• Suction conditions: flooded or lift, available NPSH and pipe size
• Liquid, maximum temperature and presence of chlorine or solids
• Supply: phase, voltage and frequency, and the starting method
• Quantity and whether a pressure tank, switch, controller or spare seal is requested

Documents and quotation

The manufacturer datasheet for the MK is attached on this page, and the performance tables in it should be checked against your duty point. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.

Send the model code, quantity, voltage and frequency and the duty point, and we will confirm availability and prepare a quotation for Oman and the GCC.