Pedrollo HF Medium Flow Centrifugal Pump 0.37-2.2 kW

Pedrollo HF Medium Flow pump explained

The Pedrollo HF Medium Flow is a range of single-impeller centrifugal pumps for large flows at medium to low heads, reaching up to 700 l/min (42 m³/h) and up to 39 m, with 0.37 to 2.2 kW motors. It has a cast iron body, a stainless steel AISI 304 impeller and shaft cover. Seven Star LLC supplies the HF in Oman and the GCC as an independent supplier in Muscat.

HF 50, HF 51, HF 70 and HF 5 are the four size lines. Letters A, B and C step through impeller sizes, and the datasheet lists the HF 5 line with extra suffixes (BM, AM, ARM) as separate models, so quote the full code. The datasheet lists HF 50B at 0.37 kW (10 m), HF 51A at 0.75 kW (21.2 m), HF 70A at 2.2 kW (39 m) and HF 5ARM at 2.2 kW (23.5 m). HFm is single-phase, and the HF 70A is listed in three-phase only.

HF Medium Flow technical specifications

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

How the HF Medium Flow works and what limits it

Working pressure is 6 bar for HF 5-50-51 and 10 bar for HF 5M and HF 70, suction up to 7 m, liquid -10 to +90 °C, ambient up to +40 °C and IP X4. The pump has a stainless steel AISI 304 impeller, a cover in AISI 304 (cast iron for HF 5M and HF 70) and an AISI 431 shaft.

EN 733 defines the dimensions and rated duty points of end-suction centrifugal pumps on a bearing frame or close-coupled to a standard motor, with PN10 flanged ports. Because the port sizes, the shaft ends and the performance points are standardised, a pump of this kind can be matched to the dimensions of an existing installation and pumps from different makers share the same footprint logic. Liquid enters axially through the suction port, the impeller adds velocity, and the volute converts that velocity into pressure at the delivery flange. Efficiency is highest near the design point of the chosen impeller diameter.

HF Medium Flow 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 HF Medium Flow fits: related Pedrollo pumps

For higher head see the CP and 2CP, for stainless steel see the F-INOX, and for a similar flow with an open impeller see the NGA-PRO.

Selecting a HF Medium Flow pump: checklist

• Choose by flow first: HF is a high-flow, low-head design
• Read the head from the table for each letter
• Check 6 bar (HF 5-50-51) or 10 bar (HF 5M, HF 70) limit
• Single-phase HFm or three-phase HF
• Check the suction path to keep the 7 m limit

Installing and maintaining the HF Medium Flow

Install the pump on a rigid baseplate or concrete plinth with the motor and pump shafts aligned within the limits given in the manual, and use flexible joints or expansion pieces if pipe forces could load the flanges. Keep the suction line straight for several pipe diameters before the pump, with a reducer that does not trap air, and avoid a suction pipe smaller than the port. Fill and vent the casing before starting, check the rotation, and never run the pump against a closed valve for long. Inspect the mechanical seal after the first weeks of service and at regular intervals. Keep a record of the nameplate data, since impeller trim and motor size change with the letter at the end of the model name.

HF Medium Flow applications in Oman and the GCC

The manufacturer lists furrow and sprinkler irrigation, drawing water from lakes, rivers and wells, and industrial applications with large flows and low pressure. In the GCC farms and landscaping projects use this class for tank-to-field transfer, and cooling-water circuits use it where head is low.

On industrial and municipal sites in Oman, standardised pumps are chosen because they can replace or match existing units on the same baseplate and flange pattern. Dust, high ambient temperature and coastal humidity are the usual design conditions, so verify motor protection class and specify a seal suitable for the liquid. State if the liquid is treated water, brackish water or cooling-tower make-up.

Information to send with your HF Medium Flow RFQ

• Duty point: flow rate and total head, plus the margin you want above it
• Liquid, temperature and any chlorides or other chemicals
• Suction conditions and NPSH available, pipe sizes and flange standard
• Motor requirement: voltage, frequency, IE class, and any bare-shaft or coupled arrangement
• Quantity, spares (mechanical seal, impeller) and delivery location

Documents and quotation

The manufacturer datasheet for the HF Medium Flow 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.