Damage to the gland


Rubbing at the inside diameter of the gland

  • Partial rubbing on only one side.
    • The gland has slipped and is no longer centered over the shaft.
    • Improper installation. It was not centered over the shaft.
    • The shaft is bending.
    • Pipe strain.
    • The pump is operating off of its best efficiency point (BEP)
    • Misalignment between the pump and the driver.
  • Rubbing all around the inside diameter of the gland
    • The sleeve is not concentric with the shaft.
    • The seal is not concentric with the sleeve.
    • Bad bearings will cause the shaft to move in all sorts of directions.
    • A bent shaft.
    • Unbalanced impeller or rotating assembly.
    • Solids attached to the shaft, or trapped between the shaft and the gland.
    • Cavitation.
    • Water hammer


  • If there is evidence of rubbing the corrosion will be accelerated.


Gland passages clogged or not connected properly.

Please look at this API (American Petroleum Institute) gland. You can see some potential problems:

  • The Flush and quench connections (F&Q) can be mixed up and the lines reversed
  • The Flushing connection can be clogged or the pipefitting could be blocking the passage.
  • The Quench connection could be clogged also


  • On February 18, 2018