• Capacity

    A unit of measurement to show the flow rate of a pump, expressed in the volume that a pump can pump per unit of time (m³/h or l/s).

  • Cavitation

    Cavitation is the process in which small vapor bubbles are formed when the pressure becomes lower than the vapor pressure of the liquid. When these vapor bubbles implode, they cause vibrations and cause damage to the installation.

    This phenomenon occurs when NPSHa < NPSHr.

  • Density (specific mass of a fluid)

    substance's mass per unit volume. Density is often expressed as kilograms per cubic meters or pounds per cubic foot.

  • Flow

    A measure of the liquid volume capacity of a pump, given in cubic meter per hour (m³/h).

  • Free passage

    The maximum size of solids that a pump can handle.

  • Head

    A measure of pressure, expressed in metres for centrifugal pumps.

    Pump head is the height of fluid column that a pump can create from the kinetic energy it gives to the liquid.

  • Impeller

    An impeller is the rotating part of the pump that moves the water further.

  • Pipe friction loss

    The positive head loss from the friction resistance between the pipe walls and the moving liquid.

    The faster a liquid moves, or the thicker it is, the more it drags and creates losses.

  • Pressure

    The force exerted by a fluid on the walls of a tank, pipe, etc. Normally measured in pascal (Pa), bar or pounds per square inch (psi).

     

  • Prime

    The prime is the amount of fluid required to start pumping when the fluid source is lower than the pump. It is kept in the pump by a foot valve on the suction line or by a valve or chamber in the pump.

  • Self priming or dry priming

    Self-priming or dry-priming refers to pumps that draw liquid from below the pump inlet (suction height), as opposed to pumps that require flooded suction.

  • Single phase

    A single-phase power supply is 110V or 230V, and is mainly used for domestic applications.

  • Three phase

    A three-phase power supply is 400V or more, and is mainly used for industrial applications.

  • Viscosity

    The "thickness" of a liquid or its ability to flow. Most liquids decrease in viscosity and flow more easily as they get warmer.

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