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Method for installing product monitoring device in underground storage tanks

  • US 4,999,900 A
  • Filed: 06/29/1990
  • Issued: 03/19/1991
  • Est. Priority Date: 06/22/1989
  • Status: Expired due to Fees
First Claim
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1. A method for installing a product monitoring device in an underground fuel storage tank having an interior space and having a riser pipe extending upwardly therefrom to the surface of the ground, the riser pipe having an open interior surface which communicates with the interior space of the underground fuel storage tank, the method comprising the steps of:

  • telescopingly installing a fill tube within said interior surface of said riser pipe, said fill tube having an upper end, a lower end and an exterior surface between the upper end and the lower end, thereby forming a coaxial vapor recovery refueling system having an annular space created between said exterior surface of said fill tube and said interior surface of said riser pipe, said annular space defining a return vapor passage of said system;

    supporting a product sensor in the annular space thus created between the exterior surface of the fill tube and the riser pipe interior surface, the product sensor being used to sense representative characteristics of a product located within the tank interior space; and

    leaving the product sensor so supported within the annular space of the coaxial vapor recovery refueling system during refueling of the underground fuel storage tank.

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