Multi-walled pipes and storage tanks for toxic and corrosive fluids
AssigneesTheresa M. Kauffman, Joseph J. Boswell, George L. Williamson
InventorDonn K. 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.
Claims14
A multi-walled vessel having improved circumferential and axial strength for transporting and storing fluids, comprising;
- (a) a first containment wall comprised of chopped fiberglass and continuous fiberglass strands secured to each other by polyester resin, said first wall having a thickness of from about 0.300" to about 0.330";
- (b) a highly chemically resistant barrier on the inner surface of said first containment wall;
- (c) a plurality of substantially circumferential support ribs integrally bonded to said first containment wall;
- (d) said support ribs having feet of about 2.0" each in length by means of which said support ribs become integrally bonded to said first containment wall;
- (e) a first layer of closed cell foam located between said first containment wall and the inside surfaces of said support ribs;
- (f) a second containment wall comprised of chopped fiberglass and continuous fiberglass strands secured to each other by polyester resin, said second wall having a thickness of from about 0.250" to about 0.300";
- (g) said second containment wall having no undulations;
- (h) said second containment wall being integrally bonded to the top of said support ribs;
- (i) a second layer of closed cell foam located in the interstitial space between said first containment wall, said second containment wall and the outside surfaces of said support ribs;
- and
- (j) said second layer of closed cell foam being level with the top of said support ribs.
Dependencies are inferred from the claim text.