Method of making multi-walled pipes and storage tanks for toxic and corrosive fluids
AssigneesTheresa M. Kauffman, Martha A. Burdick, George L. Williamson
InventorDonn Kauffman
Life of this patent
Estimating the term…
Abstract
Improved multi-wall containers and pipes for transporting fluids which have to be protected against leakage and mechanical forces, have an inner and outer wall separated by a continuous foam layer integrated into the containers. Improved strength and resistance to axial inertial pressure is provided by the method of manufacture using chopped glass fibers, continuous windings of glass fibers and suitable polyester resins and circumferential ribs spaced at stress points and integrally incorporated into the containment walls. Vessels produced according to the methods of the invention have a moment of inertia strength of about 4.67 in.sup.4 substantially eliminating torquing, buckling and rupture.
Claims18
A process for making multi-walled vessels of improved circumferential and axial strength for transporting and storing fluids, comprising the steps of:
- (a) Assembling on a cylindrical form or mold an overlay comprising first sheet to receive a first layer of glass fiber reinforced resinous material;
- (b) Applying a resinous material with chopped glass fibers over said first sheet to form a highly chemically resistant barrier;
- (c) Applying over said highly chemically resistant barrier, a resinous material with chopped glass fibers and continuous strands of glass fibers;
- (d) Curing said resinous material containing said chopped glass fibers and continuous strands of glass fibers to form a first containment wall;
- (e) Applying at predetermined points on said first containment wall substantially circumferential preformed continuous rib shaped foam, and securing said foam to said first containment wall;
- (f) Applying over said rib shaped foam chopped and continuous glass fibers with a resinous material form a plurality of substantially circumferential ribs integrally bonded to said first containment wall;
- (g) Applying and securing bridging foam to said first containment wall between said ribs up to the level of the top of said ribs;
- (h) Applying over said bridging foam and said ribs, a resinous material with chopped glass fibers and continuous strands of glass fibers;
- (i) Curing said resinous material containing said chopped glass fibers and continuous strands of glass fibers to form a second containment wall integrally bonded to said ribs;
- (j) Attaching to said first containment wall a leak alarm safety monitor to detect liquid seepage;
- (k) Applying an impervious layer of film between said first containment wall and said bridging foam;
- (l) Applying said layer of film between the outer surfaces of said ribs;
- (m) Applying said layer of film over said leak alarm safety monitor;
- and
- (n) Having said layer of film extend entirely around the vessel.
Dependencies are inferred from the claim text.