Pedrollo PQ Peripheral Pump 0.3-2.2 kW Cast Iron

Pedrollo PQ pump explained

The Pedrollo PQ is a family of peripheral impeller pumps with radial suction, covering 0.30 to 2.2 kW and reaching up to 90 l/min (5.4 m³/h) and up to 100 m of head. Models are PQ 60, PQ 61, PQ 65, PQ 80, PQ 90, PQ 100, PQ 200 and PQ 300, each with a cast iron body, brass impeller and aluminium motor bracket. Seven Star LLC supplies PQ pumps in Oman and the GCC as an independent supplier in Muscat.

The number after PQ is the size step: PQ 60 and PQ 61 are the smallest at 0.30 kW, PQ 65 is 0.55 kW, PQ 80 and PQ 90 are 0.75 kW, PQ 100 is 1.1 kW, PQ 200 is 1.5 kW and PQ 300 is 2.2 kW. A PQm prefix with a lower-case m marks the single-phase version on 230 V, and the plain PQ is three-phase 230/400 V. The datasheet states that the current version has noise levels reduced by 20 percent.

PQ technical specifications

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

How the PQ works and what limits it

Maximum working pressure depends on the model: 6 bar for PQ 60, PQ 61 and PQ 65, 7 bar for PQ 80, and 10 bar for PQ 90, PQ 100, PQ 200 and PQ 300. Ambient temperature is up to +40 °C, and +50 °C for PQ 60 and PQ 61. Mechanical seals are the AR-12 type (ceramic, graphite, NBR) on PQ 60 to PQ 80, a silicon carbide, graphite, NBR seal on PQ 90, and the FN-14 graphite and ceramic seal on the 14 mm shaft of the PQ 100, 200 and 300. IP X5 protection is available on request for PQ 80 to PQ 300.

A peripheral (side-channel) impeller is a disc with radial vanes cut around its rim. Liquid enters the vane pockets, is thrown outwards, returns and is re-accelerated many times in one revolution, which is why a small peripheral pump reaches a high head from a low flow and a modest motor. The trade-off is that the flow is small and the narrow clearances do not tolerate sand, fibres or scale. For the PQ the liquid must therefore be clean and free of abrasive particles, and the suction line must be kept airtight so the pump can prime and hold its prime.

PQ 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 PQ fits: related Pedrollo pumps

Compare with the PKm 60 for 40 m heads, the PV range for brass-body industrial water at up to 90 °C, and the CP range of close-coupled centrifugal pumps for higher flow. For constant-pressure supply consider the VSP or a MK vertical multistage with a tank.

Selecting a PQ pump: checklist

• Read the head and flow from the curve for each model, since heads run from 40 m at the PQ 60 to 100 m at the PQ 300
• Match the working pressure limit (6, 7 or 10 bar) to your system
• Choose single-phase PQm or three-phase PQ to match the supply
• Check the liquid is clean water at up to 60 °C, and that suction lift stays within 8 m
• Ask for the IP X5 or a different mechanical seal option if the site is damp or the liquid is borderline

Installing and maintaining the PQ

Mount the pump on a firm, level base with the motor shaft horizontal and the terminal box accessible. Keep the suction pipe as short and as direct as possible, rising continuously towards the pump with no air pockets, and fit a foot valve or a non-return valve when the pump sits above the water level. Fill the pump body with liquid before the first start, because a dry start damages the mechanical seal. Check the rotation direction on three-phase versions, protect the motor with a correctly rated overload device, and keep the motor ventilation path clear of dust. Plan to inspect the seal and the shaft end if the pump is used after a long idle period, since mineral deposits can bind the impeller.

PQ applications in Oman and the GCC

PQ pumps are widely used for domestic pressure boosting, garden irrigation from a tank and small building supply in Oman and the GCC. The higher models, PQ 200 and PQ 300, are chosen where the head requirement is high but the flow is modest, for example feeding an upper floor from a ground tank. In hot, dusty sites keep the motor air path clear and use a canopy to reduce solar heating.

Heat is the main enemy of small peripheral pumps in the Gulf. Direct sun on a pump house can push the motor beyond its stated ambient limit, so provide shade and airflow, and keep sand and dust away from the terminal box. Where the supply water is hard, scale will build up in the narrow vane clearances over time, and a periodic descaling or a filter ahead of the pump extends life.

Information to send with your PQ RFQ

• Required flow rate and total head at the duty point, including static suction lift
• Liquid type, maximum temperature and any dissolved solids or chlorine
• Power supply: single-phase or three-phase, voltage and frequency (50 Hz or 60 Hz)
• Pipe size and thread type at suction and delivery
• Quantity, delivery location and whether a pressure tank, switch or control is also needed

Documents and quotation

The manufacturer datasheet for the PQ 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.