What Does Inversion Drum Mean?
An inversion drum is a type of equipment used in the trenchless rehabilitation of sewer or potable water piping. Its main purpose is to facilitate the installation of resin impregnated pipe lining for piping repair or rehabilitation.
Inversion drums are typically constructed of stainless steel and are mounted on a steel frame. Other components typically included with the inversion drum include:
- Blow off valve/pressure control
- Inspection window
- Carrying handles
- Lining chamber
Trenchlesspedia Explains Inversion Drum
Inversion drums are an essential tool in the installation of Cured-In-Place Pipe (CIPP) lining. The inside of the liner is first vacuum impregnated with a specified resin. The coiled liner is then inflated into the host pipe section under repair. During the process, the liner is inverted (turned inside out) so that the resin-saturated inside is now on the outside and pressed against the pipe’s inner walls.
After insertion of the pipe liner, a heating medium (water or steam) is run through the pipe and liner to cure the resin to form a permanent bond between the rehabilitated pipe and the liner. The inversion drum allows the operator to control the inversion process by regulating the air pressure and speed of the liner through the host pipe.