Pedrollo FG EN 733 Bare-Shaft Centrifugal Pump

Pedrollo FG pump explained

The Pedrollo FG is a range of EN 733 standardised centrifugal pumps supplied with a support structure and a bare shaft, so the pump is coupled to a separate motor chosen for the job. The datasheet gives flow up to 5750 l/min (345 m³/h), head up to 98 m and a maximum casing pressure of 10 bar (PN10). Seven Star LLC supplies the FG in Oman and the GCC as an independent supplier in Muscat.

A model such as FG2-65/160B is read as follows: FG2 identifies the 2-pole (2900 min-1) version, 65 is the port size in mm, 160 the nominal impeller diameter in mm, and the letter (A, B, C) selects the impeller trim. The datasheet lists the motor to be coupled for each model: FG2-32/160C needs 1.5 kW, FG2-65/125A needs 7.5 kW, FG2-65/200AR needs 22 kW and FG2-65/250B needs 37 kW, with heads from 11 to 97 m in the listed models.

FG technical specifications

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

How the FG works and what limits it

The manufacturer lists suction up to 7 m and liquid between -10 and +90 °C. Options on request include different mechanical seals, a 60 Hz motor version, handling of liquids at other temperatures, adaptation to high- or low-temperature environments and a counterflange kit with screws, nuts and gaskets. Because the shaft is bare, motor choice and coupling alignment are the buyer’s responsibility.

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.

FG 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 FG fits: related Pedrollo pumps

Close-coupled alternatives are the F and F-INOX; for a vertical-mounted high-pressure option see the HT-PRO, and for large flow at low head see the HF Medium Flow.

Selecting a FG pump: checklist

• Choose port size and impeller from the duty curve (32/160 to 100/250)
• Select the motor power listed for that model
• Check suction conditions and temperature
• Decide on seal options and counterflanges
• State 50 or 60 Hz

Installing and maintaining the FG

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.

FG applications in Oman and the GCC

The datasheet lists water supply, pressurisation, irrigation, fire-fighting systems, industrial and agricultural applications and air conditioning, cooling, heating and circulation systems. In Oman and the GCC it is a practical choice for plant refurbishment where an EN 733 footprint must be matched, and for projects that need larger motors or special voltage.

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 FG 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 FG 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.