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Liquid line break control system and method

  • US 3,952,759 A
  • Filed: 08/14/1974
  • Issued: 04/27/1976
  • Est. Priority Date: 08/14/1974
  • Status: Expired due to Term
First Claim
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1. In a method for controlling the operation of a valve controlling fluid flow in a pipeline to close the valve in the event of a leak or break in the line, the steps of:

  • monitoring the static fluid pressure in the pipeline to detect the occurrence of a negative pressure wave originating on the downstream side of the valve, distinguishing said wave from a like wave originating on the upstream side, monitoring the rate of static pressure drop on the downstream side in the event that a negative pressure wave originating on that side of the valve is detected, and closing the valve in the event that the pressure on the downstream side decreases faster than a predetermined rate after the negative pressure wave is detected.

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