Corrosion protection system for transport pipe
View Patent ↗An apparatus and method for coating pipelines with a hot melt adhesive coating and a tape. The coating may comprise a copolymer of an alkyl substituted hydrocarbon polymer in combination with a diene polymer and the tape to overly the coating may comprise a polymeric backing. Furthermore, the tape may also include a pressure sensitive adhesive.
1. A method of applying corrosion and mechanical protection to a pipeline, the method comprising:
providing a substrate having a surface, said substrate comprising at least a portion of said pipeline;
applying a hot melt adhesive onto said substrate surface by heating said hot melt adhesive between 300° F. to 450° F. and spraying said hot melt adhesive through an orifice onto said substrate surface, said hot melt adhesive having a viscosity of equal to or less than about 40,000 cps. at 425° F.; and
applying a tape to said hot melt adhesive, said tape having a polymeric backing.
2. The method of claim 1 wherein said step of spraying comprises supplying a spraying device including a die wherein said die comprises one or a plurality of openings having a length of about 0.005 to 0.50 inches and a width of about 0.005 to 0.50 inches.
3. The method of claim 1 further comprising preconditioning said substrate wherein preconditioning said substrate surface includes the step of blasting said substrate.
4. The method of claim 1 wherein said substrate comprises a steel pipe.
5. The method of claim 1 wherein said substrate further comprises an outer surface, and a layer disposed on said outer surface wherein said layer is selected from the group consisting of polyethylene, polypropylene, polyurethane and epoxy.
6. The method of claim 1 wherein said polymeric backing comprises a polyethylene selected from the group consisting of low density polyethylene, high density polyethylene and blends thereof.
7. The method of claim 1 wherein said tape includes a pressure sensitive adhesive, wherein said pressure sensitive adhesive contacts said hot melt adhesive.
8. The method of claim 7 wherein said pressure sensitive adhesive comprises a butyl rubber.
9. A method of applying corrosion and mechanical protection to a pipeline, the method comprising:
providing a substrate having a surface, said substrate comprising at least a portion of said pipeline;
applying a hot melt adhesive comprising an alkyl substituted hydrocarbon polymer in combination with a diene polymer onto said substrate surface by heating said hot melt adhesive between 300° F. to 450° F. and spraying said hot melt adhesive through an orifice onto said substrate surface, said hot melt adhesive having a viscosity of equal to or less than about 40,000 cps. at 425° F. and
applying a tape to said hot melt adhesive, said tape having a polymeric backing.
10. The method of claim 9 wherein said alkyl substituted hydrocarbon polymer comprises polyisobutylene.
11. The method of claim 9 wherein said diene polymer comprises polyisoprene.
12. The method of claim 9 wherein said alkyl substituted hydrocarbon polymer is present at levels of 90% by weight or greater, and said diene polymer is present at levels of about 10% by weight or less.
13. The method of claim 9 wherein said step of spraying comprises supplying a spraying device including a die wherein said die comprises one or a plurality of openings having a length of about 0.005 to 0.50 inches and a width of about 0.005 to 0.50inches.
14. The method of claim 9 further comprising preconditioning said substrate wherein preconditioning said substrate surface includes the step of blasting said substrate.
15. The method of claim 9 wherein said substrate comprises a steel pipe.
16. The method of claim 9 wherein said substrate further comprises an outer surface, and a layer disposed on said outer surface wherein said layer is selected from the group consisting of polyethylene, polypropylene, polyurethane and epoxy.
17. The method of claim 9 wherein said polymeric backing comprises a polyethylene selected from the group consisting of low density polyethylene, high density polyethylene and blends thereof.
18. The method of claim 9 wherein said tape includes a pressure sensitive adhesive, wherein said pressure sensitive adhesive contacts said hot melt adhesive.
19. The method of claim 18 wherein said pressure sensitive adhesive comprises a butyl rubber.