HOW TO USE THE HORIZONTAL CENTRIFUGAL PUMP DRAGON

Centrifugal pumps are ideal for applications requiring continuous flow, but given the significant speeds and forces involved, it is preferable to avoid fluids rich in solid particles or highly corrosive, which would damage the impeller and clog the flow channels.
It is possible to move fluids up to 500 CPS or with a specific weight of up to 1.9 kg/L by increasing the motor's power. With the same number of revolutions [rpm], increasing the motor's power does not affect the flow rate and head of the centrifugal pump but compensates for the increased effort due to heavier liquids.
A centrifugal pump is a very efficient but delicate machine. It is necessary to know the characteristics of the system and the working fluid to choose the right machine.
- Due to their operating principle, centrifugal pumps create a depression in suction. If the absolute pressure at the impeller inlet is lower than the vapor pressure of the working fluid, cavitation occurs (creation of bubbles of evaporated liquid and implosion on the impeller). Fluimac's horizontal centrifugal pumps, usually positioned outside the fluid tanks, must always be installed below the liquid level so that the liquid can easily enter the pump's suction. However, it is possible to check the maximum suction height using the NPSH curves: The pump's NPSH (available) must always be greater than the NPSH required by the system, considering the geodetic height (height difference between the downstream tank and the pump inlet), the head losses between these two sections, and the pressure difference between the free surface pressure of the downstream tank and the vapor pressure of the liquid.
- In addition to suction conditions, it is essential to know the characteristics of the discharge pipes because they affect the calculation of the head. Before choosing a horizontal centrifugal pump, it is necessary to know the head required by the system: to the geodetic height (height difference between the downstream and upstream tanks through which to move the fluid), it is necessary to add all the head losses due to the system. We can divide the losses into two types: distributed and localized. The former depend on the fluid flow in the pipes and require knowledge of the dimensions and conditions of the pipes; the latter depend on localized factors in the system, such as curves, valves, or filters.
- Finally, it is necessary to know the working fluid. The viscosity and density also affect the calculation of the head losses and the choice of the motor's power.

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