In terms of the plastic inner tube, the design is classified as a compressed liner concept since the plastic-steel connection is not achieved through the deformation of the polymer component. Rather, the design inserts an incompressible material under pressure at the interface thereby totally limiting the radial strain of the inner polymer tube. The cement layer serves to transfer the majority of the stress to the outer metal component
as well as acting as a continuous enclosing shield to perfectly anchor the plastic line.
Because of the extremely low stress in the tensile mode, initiations of micro-fissures in the plastic liner are entirely avoided. This allows numerous polymeric materials to be successfully implemented without endangering their structural integrity.
Very few problems have been experienced with this concept, which can be partly attributed to the large safety factor that characterizes the compressed liner concept. Another contributing factor is that the concept has built into it a secondary corrosion defense system, the intermediate structure essentially forming a cement-lined pipe system so that the basic pH of the lime also serves to inhibit the steel.
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