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Overpressure relief control system

  • US 4,372,334 A
  • Filed: 09/18/1981
  • Issued: 02/08/1983
  • Est. Priority Date: 05/18/1981
  • Status: Expired due to Term
First Claim
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1. A method of relieving an overpressure condition within a pressurized system having a pressure passage to vent pressurized fluid therefrom comprising the steps of:

  • (a) providing at least two relief passages for flowing a pressurized fluid to a safe discharge location;

    (b) interconnecting said relief passages with said pressure passage by means of a valve normally in a first position to provide full flow communication between said pressure passage and a first of said relief passages, said valve including motor means to move said valve between said first position and a second position providing full flow communication between said pressure passage and a second relief passage;

    (c) providing each relief passage with an overpressure relief device having a respective overpressure rating, said relief device in the first relief passage being a rupture disc;

    (d) sensing the integrity of said rupture disc;

    (e) sensing the pressure within said pressure passage; and

    (f) upon sensing the rupture of said rupture disc and upon the pressure in said pressure passage decreasing to a selected first fraction of the overpressure rating of the relief device in said second relief passage, controlling said motor means to place said valve in said second position.

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