Pipework pig for inspecting metal pipelines includes a first drive member with a centered, ring-shaped support fastened to a member to surround the first drive member with multiple primary drive elements extensively set apart.

摘要

A first drive member (26) has a centered, ring-shaped support (60) fastened to a member to surround the first drive member that has multiple primary drive elements (62) extensively set apart, each with its end fastened on a support and stretching away from the support. It also has a flexible support ring (68) behind the primary drive elements. The other free ends of the primary drive elements contact the inner wall of a corresponding pipeline.