Patent ID: 8117911

Claim:
A tank gauge for bulk liquid above-ground storage tanks, comprising: an elongated outer gauge tube, wherein the outer gauge tube is steel and is C-shaped in cross-section forming an open channel, said outer gauge tube being attached in a vertical position proximate to the bulk liquid above-ground storage tank by a plurality of bolt and nut fasteners, said outer gauge tube having a plurality of indicia marked thereon and associated with the liquid level of said storage tank, said outer gauge tube being attached to the base of the storage tank by a frangible footer attachment, said footer attachment capable of being frangibly detached from the base of the storage tank when subjected to a force associated with the settling or moving of the storage tank, said frangible footer comprises a deformable steel footer plate and frangible steel bolt and nut-type fasteners, and wherein the outer gauge tube houses a weighted slidable inner gauge, said weighted slidable inner gauge capable of travelling vertically within the outer gauge tube by action of a cable, said slidable inner gauge having a plurality of indicia marked thereon and associated in combination with the indicia on the outer gauge tube with the liquid level of said storage tank, said cable connected to the slidable inner gauge and disposed within the outer gauge tube, said cable in operative association with a pulley system for connecting the slidable inner gauge to a weighted intra-tank float, said intra-tank float comprising at least one of either a water phase float or a oil phase float, said pulley system comprising at least one first pulley attached to the top edge of the storage tank and in operative alignment with the outer gauge tube, and at least one second pulley attached to the top of the storage tank for directing said cable into a through-hole in the top of the storage tank for connection to a second weighted intra-tank float, said second intra-tank float comprising at least one of either a water phase float or a oil phase float.