Common Causes of Overpressure


Common causes of overpressure

below is a list of Common causes of overpressure in process operation.common causes of overpresure

  • Utility failures, including:
    • General power failure
    • Partial power failure
    • Loss of instrument air
    • Loss of cooling water
    • Loss of steam
    • Loss of fuel gas or fuel oil.
  • Loss of cooling duty, caused by:
    • Loss of quenching medium
    • Air cooled exchanger failure
    • Loss of cold feed
    • Loss of top or intermediate reflux
  • External fire
  • Mechanical equipment failure
  • Exchanger tube rupture
  • Upstream pressure relief
  • Runaway chemical reaction
  • Blocked outlets, such as:
    1. Blocked liquid outlet
    2. Blocked vapor outlet
  • Thermal expansion
  • Abnormal heat input
  • Abnormal vapor input
  • Loss of absorbent flow
  • Entrance of volatile material
  • Accumulation of non-condensables
  • Valve malfunction, such as
    • Check valve malfunction
    • Inadvertent valve operation (open/close/bypass)
    • Control valve failure fully open
    • Control valve failure fully closed.
  • Process control failure
  • Human error.

Any of the above causes warrant the installation of pressure relief instruments such as relief valves or bursting disks.

keywords; Potential causes of overpressure, common causes of overpressure

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