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Within Existing Pipe

In this form of replacement application a new pipe of smaller outside diameter than the inside diameter of the existing pipe is inserted (pushed or pulled) within the existing pipe and provides a complete replacement of the structural and flow functions of the existing pipe. This is usually referred to as slip lining and is described in more detail in a separate box.

In order to facilitate the insertion of the replacement pipe, the reduction of the inside diameter of the new pipe with respect to the existing pipe is often substantial. The potential reduction in flow capacity may be offset by a lower roughness coefficient for the replacement pipe or the ability to operate the new pipeline at a higher pressure. 

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