Definition - What does Unibody Pig mean?
A unibody pig is a type of pig used for trenchless inspection and rehabilitation of sewer pipes. They are single body polyurethane pigs mainly used to remove liquid from wet gas systems, for separation of refined products and control the buildup of paraffin. Pigs were primarily used for cleaning out a pipeline, but now pigs can be equipped with a computerized inspection probe to make it an intelligent pig which can also carry testing devices.
Trenchlesspedia explains Unibody Pig
A unibody pigs are popular and more sturdy than the polly foam pigs and less abrasive than the steel body mandrel. These pigs have a multi-disc configuration and can be used for different purposes such as removing liquids, controlling build up, and in pipeline commissioning. Unibody pigs are designed to maneuver in less than 1.5 diameter radius ells and bends. It can also be attached with wire brushes attached along with the different configurations.
Pigging and robotic inspection have become an important part of trenchless operations. These methods have made it easier to inspect new pipelines for commissioning, and for inspecting old pipelines for damage before selecting a trenchless rehabilitation method.