SHEAR INCREASING SYSTEM

摘要

A piping system employs a friction layer of windings, beads or pellets placed between insulation layers and/or on the outermost layer, that being the insulation layer if no jacket is employed or the jacket if it is employed. The windings, beads or pellets are wrapped or applied while the layer is uncured or warm so as to embed themselves into the surface and create a uneven, bumpy or undulating surface. The resulting product increases friction both internally and externally to better restrain or inhibit pipe movement in underground, marine, or subsea applications or provide restraint to the surrounding environment (earth, concrete, etc.).

主权项

1. A steel pipe having an outer surface and a fluid conduit comprising:
an insulation layer enveloping the outer surface and of a material selected from the group consisting of: polyurethane, foamed polyurethane, polypropylene, glass syntactic polyurethane, and glass syntactic polypropylene; a jacket enveloping the insulation layer of a high density polyethylene; an outer layer on the jacket and having an undulating surface of at least one of a plastic wire, a plastic mesh, a metal mesh, beads, and pellets.