Storage tank with bypass conductor cable
AssigneeALLTEC Corporation
InventorsChristopher A. Bean, James Stuart Grasty, Jr.
Life of this patent
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Abstract
A lightning protection system for liquid storage tanks having floating roofs wherein lightning energy is not directed into the shell of the storage tank. The lightning protection system includes at least one low-resistance low-impedance bypass conductor cable configured for lightning related frequencies and for routing lightning energy and for bounding charges away from the shell of the storage tank.
Claims17
A lightning protection system for a liquid storage tank, the storage tank having a shell and a floating roof floating atop of liquid in the shell, the lightning protection system comprising:
- a plurality of bypass conductor cables having a rectilinear cross-sectional shape connected to a plurality of air terminals projecting above the shell of the storage tank, the plurality of bypass conductor cables comprising about 25 to 35 inner copper wires defining a first carrier and wherein about 40 to 45 of said first carriers are woven together to form a first braided structure, a plurality of woven stainless steel wires forming a sheath surrounding the copper wires, wherein the sheath comprising about 25 to 35 stainless steel wires defining a second carrier and wherein about 40 to 55 of said second carriers are woven together to form a second braided structure surrounding the first braided structure and being configured such that lightning does not dissipate through the shell of the storage tank, and wherein the shell of the storage tank is isolated from the plurality of bypass conductor cables and the plurality of air terminals are spaced apart from each other above the storage tank, the plurality of air terminals are insulated from the storage tank and electrically bonded to the plurality of bypass conductor cables, and wherein lightning striking any one of the plurality of air terminals does not energize the shell of the storage tank and is conducted to ground through at least one of the plurality of bypass conductor cables without passing through the shell of the storage tank.
An earthing system to protect a liquid storage tank from lightning, the storage tank having a shell and a floating roof floating atop of liquid in the shell, the earthing system comprising:
- a plurality of air terminals spaced apart from one another and projecting above the storage tank, the plurality of air terminals insulated from the storage tank, and each air terminal of the plurality of air terminals are electrically bonded with a bypass conductor cable directly to earth ground such that lightning striking any one of the plurality of air terminals does not energize the shell of the storage tank and is conducted to ground without passing through the shell of the storage tank, wherein the bypass conductor cable has a rectilinear cross-sectional shape and comprises about 25 to 35 inner copper wires defining a first carrier and wherein about 40 to 45 of said first carriers are woven together to form a first braided structure, and a sheath surrounding the copper wires comprising about 25 to 35 stainless steel wires defining a second carrier and wherein about 40 to 55 of said second carriers are woven together to form a second braided structure surrounding the first braided structure.
Dependencies are inferred from the claim text.