Patent ID: 7922855
Filing Date: 2011-04-12
Classification: F16L

Abstract:
1. A method for guiding an everting form employed to carry repair material into a pipe or conduit, comprising: releasably attaching a tubular web of filamentary material within an interior surface of an everting form, wherein a repair material is releasably disposed on the interior surface of the everting form, and wherein the tubular web is releasably attached to a portion of the interior surface of the everting form and a portion of the repair material along the full length of the everting form when the everting form is un-everted; fixing a first end of the tubular web to a substantially closed end of the everting form; applying force to the tubular web during eversion of the everting foam to guide a zone of eversion of the everting form and the repair material through directional changes and discontinuities in the pipe or conduit, wherein the tubular web releases from the everting form and the repair material at the zone of eversion, wherein releasably attaching the tubular web to the everting form and the repair material prevents localized longitudinal differential movement between the tubular web, the everting form, and the repair material in the region of the zone of eversion, and wherein the tubular web opens at the zone of eversion and then closes after the zone of eversion; curing the repair material; and removing the everting form from the cured repair material.