VENT SYSTEM FOR A FUEL STORAGE TANK
First Claim
1. A vent system for a fuel storage tank, the vent system defining a vent path from the fuel storage tank to atmosphere and comprising:
- an elongate vent pipe which extends vertically, from a lower end thereof, to a rain cap located at the upper end of the vent pipe, anda pressure vacuum valve located in a pressure vacuum valve module in the vent path upstream of the lower end of the vent pipe and downstream of the tank, the vent path passing through the pressure vacuum valve module via the pressure vacuum valve,wherein the pressure vacuum valve maintains the vent path in a closed condition unless the pressure in the tank is above or below a predetermined pressure, andwherein the pressure vacuum valve module includes a shut-off valve which closes the vent path when the pressure vacuum valve is removed from the pressure vacuum valve module.
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Accused Products
Abstract
A vent system for a fuel storage tank and a pressure vacuum valve (PVV) module for use with such a vent system are disclosed. The vent system defines a vent path from the fuel storage tank to atmosphere. An elongate vent pipe extends vertically to a rain cap located at the upper end of the vent pipe. A pressure vacuum valve (PVV) is located in the vent path between the lower end of the vent pipe and the tank. The pressure vacuum valve maintains the vent path in a closed condition unless the pressure in the tank is above or below a predetermined pressure. By separating the PVV from the rain cap and placing it between the lower end of the vent pipe and the tank, it is possible to site the PVV at an accessible level for maintenance.
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Citations
27 Claims
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1. A vent system for a fuel storage tank, the vent system defining a vent path from the fuel storage tank to atmosphere and comprising:
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an elongate vent pipe which extends vertically, from a lower end thereof, to a rain cap located at the upper end of the vent pipe, and a pressure vacuum valve located in a pressure vacuum valve module in the vent path upstream of the lower end of the vent pipe and downstream of the tank, the vent path passing through the pressure vacuum valve module via the pressure vacuum valve, wherein the pressure vacuum valve maintains the vent path in a closed condition unless the pressure in the tank is above or below a predetermined pressure, and wherein the pressure vacuum valve module includes a shut-off valve which closes the vent path when the pressure vacuum valve is removed from the pressure vacuum valve module. - View Dependent Claims (2, 6, 7, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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3-5. -5. (canceled)
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8. (canceled)
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11. (canceled)
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27. (canceled)
Specification