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answered Sep 9, 2016 by Normandy (21,040 points)



  • Prior to installation, check for the correct material specification, trade name and manufacturer. Check that the O-ring (and back­up ring if specified) is the correct size, undamaged and clean. Template gauges are recommended for checking larger O-ring sizes.
  • Follow the manufacturer’s recommended installation instruc­tions. This applies to both the O-ring manufacturer and the equipment manufacturer.
  • Check the condition of the ring groove and any bearing sur­faces. Ensure that they are thoroughly cleaned with a recom­mended cleanser and dried before installation of the O-ring. Note: Many cleaning of degreasing agents may chemi­cally attack the elastomer.
  • O-rings may be lubricated only where specified lubricants are recommended by the supplier.
  • Always use fully molded O-rings.
  • Take care not to cut, pinch or shear an O-ring when assembling the joint.
  • Never force or stretch the O-ring into a groove for which it is not specifically designed.
  • Do not use unmarked O-rings or O-rings that have not been stored in the supplier’s packing.
  • Do not install an O-ring with an expired shelf life.
  • Do not make up an O-ring joint if the previous O-ring showed evidence of failure. Check with your Engineering Department first.
  • Never cut O-rings to size and then glue or bond back together.
  • Do not estimate O-ring dimensions from the groove dimensions. Only use the schematic, arrangement drawing or parts list for the equipment you are dealing with.
  • Do not re-use hard back-up rings. New back-up rings must be fitted when installing new O-rings.

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