Reproduction process of the existing pipeline

Claim 1

A process for the reproduction of the pipe of an existing pipeline, said existing pipeline including an opened end, comprising the steps of: (a) inserting into said pipeline from said opened end and axially of said pipeline, a first section of rigid pipe having an outer diameter slightly smaller than the inner diameter of said pipe of said existing pipeline, said first section having its interior front leading end temporarily blocked; (b) advancing said front leading end of said first section of rigid pipe into said existing pipeline by applying fluid pressure into the interior of said inner pipe against said temporarily blocked front leading end until said first section of rigid pipe, except for its rear, trailing end and a portion of said first section immediately adjacent said trailing end and sufficient in length for connection to a section of rigid pipe remains exposed at said opened end; (c) securing a second section of rigid pipe having an outer diameter and an inner diameter substantially equal to the outer and inner diameter of said first section to said rear, trailing end of said first section and advancing said first and second section of rigid pipe into said existing pipeline; and (d) repeating said steps of advancing sections of rigid pipe and securing an additional section of rigid pipe to the rear, trailing end of the previously inserted sections of rigid pipe, until said reproduction is completed.