Method and device for containing fuel spills and leaks

• US 5,550,532 A
• Filed: 03/03/1994
• Issued: 08/27/1996
• Est. Priority Date: 03/03/1994
• Status: Expired due to Term

• Current Assignee: Shell Oil Company (Shell Plc)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Marshall, Glen R.
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): Lee, Benjamin C.
• Application Number:
  US08/206,292
• Time in Patent Office: 908 Days
• Field of Search: 340/605, 340/618, 340/603, 340/612, 340/604, 73/304 R, 73/290 R, 73/49.2, 73/49.6, 73/74, 73/291, 73/305, 73/306, 137/312, 137/392, 137/313, 200/61.04, 200/61.05, 141/86, 141/95, 141/192, 141/198
• US Class Current: 340/604
• CPC Class Codes: G01M 3/16 using electric detection means G01M3/045, G01M3/06, G01M3/12, G01M3/20, G01M3/24, G01M3/26 take precedence
• CPC Class Codes: Y10T 137/5762 With leakage or drip collecting
• CPC Class Codes: Y10T 137/5835 Relatively movable receptacle or drain pipe and outlet
• CPC Class Codes: Y10T 137/7306 Electrical characteristic sensing

Abstract

A device and method for containing spills and leaks from fuel handling equipment is provided in which differential sensing means detect the presence of hydrocarbons and nonhydrocarbons such as water. Signals and the responses generated according to them may depend upon the nature and quantity of the substance contained in the device. Signalling may be conducted remotely and excavation and reconstruction of service station grounds is minimized with these devices. In a preferred embodiment, the device is made of unitary construction with the differential sensing means formed as a portion of the surface of a containment vessel.

Claims

1. A device for containing and responding to spillage and leaks associated with fuel handling equipment comprising:

a spillage containment vessel placed beneath the fuel handling equipment, said vessel having a substantially open top portion, said containment vessel further having an interior surface and an exterior surface, said interior surface being substantially sealed;

differential sensing means within said vessel comprising hydrocarbon and fluid sensing elements which separately sense hydrocarbon and nonhydrocarbon, at least the hydrocarbon sensing element of said differential sensing means intrinsically incorporated in the construction of said interior surface of said containment vessel such that it comprises the entirety of the interior surface of said vessel;

a signalling means, signalling means being in nonmechanical communication with at least said hydrocarbon sensing element of said differential sensing means and being in further communication with said nonhydrocarbon sensing element of said sensing means such that the differential sensing of hydrocarbons and nonhydrocarbon is communicated by said signalling means; and

a disabling means, said disabling means being in nonmechanical communication with said signalling means;

wherein said differential sensing means generates a nonmechanical communication in response to the detection of hydrocarbons, a different communication in response to the detection of the nonhydrocarbon within said vessel, said disabling means disables said fuel handling equipment in response to the detection of hydrocarbon and the detection of hydrocarbon and nonhydrocarbon are separably perceptible by an attendant of said equipment.

2. The device of claim 1 wherein said hydrocarbon sensing element comprises;

a first electrode layer, said first electrode layer formed on said interior surface of said containment vessel;

a dielectric layer formed on said first electrode layer;

a second electrode layer, said second electrode layer formed on said dielectric layer;

a hydrocarbon permeable layer, said hydrocarbon permeable layer formed on said second electrode layer;

at least two leads, a first lead and a second lead, said first lead being in electrical communication with said first electrode layer, said second lead being in communication with said second electrode layer; and

a source of electricity;

said source of electricity supplying electrical charge to each of said leads insufficient to form an electrical current between said electrode layers solely in the presence of said dielectric layer but sufficient to form an electrical charge between said electrode layers in the presence of hydrocarbons;

wherein

said hydrocarbon sensing means communicates the presence of circuit between said electrode layers to said signalling means.

3. The device of claim 1 wherein said nonhydrocarbon sensing element comprises;

a first electrode layer, said first electrode layer formed on said interior surface of said containment vessel;

a dielectric layer formed on said first electrode layer;

a second electrode layer, said second electrode layer formed on said dielectric layer;

a water permeable layer, said water permeable layer formed on said second electrode layer;

at least two leads, a first lead and a second lead, said first lead being in electrical communication with said first electrode layer, said second lead being in communication with said second electrode layer; and

a source of electricity;

said source of electricity supplying electrical charge to each of said leads insufficient to form an electrical current between said electrode layers solely in the presence of said dielectric layer but sufficient to form an electrical charge between said electrode layers in the presence of water;

wherein

said nonhydrocarbon sensing means communicates the presence of circuit between said electrode layers to said signalling means.

4. The device of claim 1 further comprising a shock sensor for detecting a predetermined physical force exerted upon said equipment, said disabling means further actuated by a nonmechanical communication from said shock sensor.

5. The device of claim 1 wherein said disabling means is further responsive to a remote command.