Claims
- 1. A heavy walled polyolefin tank within a metallic tank comprising, a metallic tank having continuous side and end walls, a flanged manway fitting and a flanged outlet fitting connected to said metallic tank, each fitting including a neck portion integrally connected to said metallic tank wall and a flange integrally connected to the free end of said neck portion, said flange having a planar outer surface, the walls of said polyolefin tank being continuous and in proximity to and spaced from the walls of said metallic tank, whereby the polyolefin tank and metallic tank are free to expand and contract independently of each other to thereby preclude damage to the tank through thermal expansion and contraction, said polyolefin tank having polyolefin flanged fittings corresponding to the metallic tank flanged fittings, said polyolefin extending through the necks of the metallic tank fittings and engaging and covering the entire planar outer flanged surfaces thereof, the engagement between the tanks being only in the region of the flanges, the polyolefin on the flange of the manway fitting extending outwardly therefrom to form a cup-shaped projection to prevent spillage of liquids on the outer surface of the outer tank when filling the inner tank, and polyolefin coated closures for said fittings, said closures adapted to engage the polyolefin flanges, whereby the inner tank flanges may be sealed between the flanges of the metallic tank fittings, thereby assuring the integrity of product containment entirely within the polyolefin tank.
- 2. A rigid polyolefin tank within a metallic tank according to claim 1, wherein a maximum clearance of 0.04 inch is maintained between the walls of the inner and outer tanks.
REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 532,010, filed Sept. 14, 1983, entitled A POLYOLEFIN TANK WITHIN A METALLIC TANK, AND THE METHOD AND APPARATUS FOR MAKING SAME, now abandoned, and assigned to the same assignees as the instant invention.
US Referenced Citations (15)
Non-Patent Literature Citations (1)
Entry |
"Design of Molded Articles", section on Shrinkage, pp. 287-291 of Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 3rd Edition, Reinhold Publishing Corp., N.Y., 1960. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
532010 |
Sep 1983 |
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