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Process to prevent vapor blockage for stage II vapor recovery

  • US 5,199,471 A
  • Filed: 03/04/1991
  • Issued: 04/06/1993
  • Est. Priority Date: 03/04/1991
  • Status: Expired due to Term
First Claim
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1. A vapor recovery process, comprising the steps of:

  • storing liquid volatilizable hydrocarbon fuel in a storage tank;

    venting said storage tank;

    pumping said fuel from said storage tank to a dispenser;

    metering said fuel from said dispenser through a nozzle into a consumer'"'"'s tank and controlling the flow of said fuel with said nozzle;

    emitting volatilized hydrocarbon vapors from said consumer'"'"'s tank during metering;

    drawing a substantial amount of said vapors through said nozzle under vacuum assisted action of a vapor pump;

    conveying a substantial amount of said vapors through a vapor return system comprising a vapor return hose and a vapor return line into said storage tank;

    condensing some of said vapors in said vapor return hose to form condensate;

    withdrawing said condensate from said vapor return hose into a condensate pickup tube extending into a nozzle by venturi action of said nozzle during said metering; and

    feeding said condensate from said nozzle to said consumer'"'"'s tank.

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