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KRAL CG Series - User Manual

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www.kral.at
Operating Instructions
KRAL Screw Pumps.
CG Series with magnetic coupling.
OIC 10en
Edition 2019-11
Original instructions

Table of Contents

Questions and Answers

  • E
    Eric KingSep 14, 2025
    What to do if my KRAL Water Pump has no pump suction?
    • K
      Karen BradleySep 14, 2025
      If your KRAL Water Pump isn't drawing suction, here's what you can check: * Ensure the pump suction line isn't closed by checking the shut-off devices and opening them if necessary. * Clean any soiled parts like the filter, suction line, suction valve, or strainer. * Reduce the suction head by adjusting the level difference, line length, or increasing the line cross-section. You could also heat up the pumped liquid or install a filter/strainer with a larger mesh width, ensuring you don't exceed the permissible mesh width. * Make sure the level in the intake container isn't too low; if it is, fill it up.
  • S
    Sandra BrownAug 25, 2025
    What to do if my KRAL CG filter or strainer is soiled?
    • M
      Michelle GreenAug 25, 2025
      If the filter or strainer of your KRAL Water Pump is soiled, clean the filter or strainer.
  • R
    rebeccagreenAug 25, 2025
    What to do if my KRAL CG Water Pump has incorrect pump direction of rotation?
    • J
      Jason ZimmermanAug 26, 2025
      If your KRAL Water Pump has an incorrect direction of rotation, make the electrical connection such that the direction of pump rotation matches that of the arrow on the flange cover.
  • D
    Devon StanleyAug 26, 2025
    What to do if my KRAL CG suction valve or line is obstructed?
    • M
      Matthew RobinsonAug 26, 2025
      If the suction valve or line of your KRAL Water Pump is obstructed, check the suction valve and line to ensure they are clear.
  • C
    Connor CampbellSep 15, 2025
    Why is my KRAL Water Pump vibrating?
    • J
      James WilsonSep 15, 2025
      If your KRAL Water Pump is experiencing vibrations, it could be due to several reasons. One potential cause is vibrations or pulsations in the system itself. To address this, try to bear the pump unit elastically, or make the connections with hoses. Also, the pump might be subject to mechanical stress. Ensure that you connect the pump correctly to the pipe system.
  • C
    Christopher GarciaSep 23, 2025
    What to do if my KRAL CG has an overload of the shaft seal by pressure build-up during the heating process?
    • J
      jessica00Sep 23, 2025
      If the shaft seal is overloaded due to pressure build-up during heating, open the pressure-side/suction-side shut-off device in order to avoid a pressure build-up through heat expansion of the pumped liquid.
  • W
    William RaySep 7, 2025
    What to do if there is resonance in the KRAL CG system?
    • J
      Jason BrewerSep 7, 2025
      If there is resonance in your KRAL Water Pump system, provide a flexible bearing arrangement for the unit or make the connections with hoses.
  • G
    Gary RuizSep 8, 2025
    What to do if the speed of flow in the suction or pressure line is too high for my KRAL CG?
    • K
      Kevin MasonSep 8, 2025
      If the speed of flow in the suction or pressure line is too high for your KRAL Water Pump: * Set the flow speed in the suction line so that it does not exceed 1 m/s. * Set the flow speed in the pressure line so that it does not exceed 3 m/s.
  • M
    monicaporterSep 2, 2025
    What to do if my KRAL Water Pump has airlock or gas in the liquid?
    • K
      Kelly Griffin MDSep 2, 2025
      If your KRAL Water Pump has an airlock or gas in the liquid: * Test the pipe system for air admission and replace parts if necessary. * Reduce the suction head. * Increase the feed pressure.
  • G
    Gabrielle AdamsAug 31, 2025
    What to do if the viscosity of the pumped liquid is too high in my KRAL Water Pump?
    • J
      Jeffrey GreerAug 31, 2025
      If the viscosity of the pumped liquid is too high in your KRAL Water Pump, increase the temperature of the liquid or reduce the rotation speed.

KRAL CG Series Specifications

General IconGeneral
SeriesCG Series
TypeCentrifugal Pump
MaterialCast iron, Stainless steel
Temperature RangeUp to 120 °C
Inlet DiameterDN 32 - DN 100

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