Abstract: Apparatus for making a polyolefin tank within a metallic tank wherein fixtures are attached to the flanges of the fittings of the metallic tank to allow the polyolefin to flow through the tank fittings, while the metallic tank is mounted in a rotational molding apparatus, whereby the outer surfaces of the tank flanges are coated with polyolefin.
Type:
Grant
Filed:
July 23, 1986
Date of Patent:
October 13, 1987
Assignees:
Poly Processing Company, Inc., Industrial Equipment & Engineering, Inc.
Abstract: A polyolefin lined tank consisting of a rigid polyolefin tank within a metallic tank wherein there is no adherence or bonding between the walls of the inner polyolefin tank and the outer metallic tank, but wherein a maximum of 0.04 inch clearance is obtained between the said walls. The polyolefin tank is formed in the metallic tank by a rotational molding technique wherein a high temperature paint or other suitable release agent is first applied to the inner walls of the metallic tank; the tank is heated; and polyolefin powder is placed in the heated tank. The polyolefin powder melts during rotation of the heated tank to thereby coat the inner walls of the tank; the tank is cooled, resulting in shrinkage of the polyolefin away from the metallic walls; during the cooling cycle, the interior of the lined tank is pressurized to control the shrinkage, resulting in minimum clearance between the outer and inner tanks, and stress relief of the inner polyolefin tank.
Type:
Grant
Filed:
April 18, 1985
Date of Patent:
December 2, 1986
Assignees:
Poly Processing Company, Inc., Industrial Equipment & Engineering, Inc.
Abstract: A three flanged polyolefin tank fitting wherein two of the flanges are integrally connected to a pipe having a threaded portion one one end thereof, one flange being connected to the opposite end of the pipe and another flange being positioned between the threaded end portion and the first-mentioned flange. The third flange consists of a flange connector having axially extending bolts extending through the second flange. The inner faces of the second and third flanges are provided with compressible gaskets, and a siphon drain is connectable to the threaded end of the pipe.
Type:
Grant
Filed:
January 19, 1983
Date of Patent:
January 8, 1985
Assignee:
Poly Processing Company, Inc.
Inventors:
Arthur F. Woods, Harry Bush, Eugene J. Kana