METHOD AND APPARATUS FOR FORMING A MODIFIED CONDUIT

摘要

A conduit modifier (54) may be used to corrugate at least a portion of a conduit (34). The conduit modifier may include at least a first plurality of rollers (58) arranged in a first pattern around a passageway. The first plurality of rollers may form ridges (36) and grooves (38) lengthwise along a conduit passing through the passageway. A second plurality of rollers (58~) arranged in a second pattern around the passageway may compress ridges forme d by the first set of rollers. The ridges may be formed such that a distance from a central axis of the conduit to a highest portion of an outer surface of a ridge is substantially equal to a distance from the central axis of the conduit to an outer surface of the un-corrugated portion (32) of the conduit . The corrugated portion of the modified conduit may be expandable.