Abstract: A self-contained integrated unit (10), including an engine (11) driving an electric generator (12), air compressor (21) and plasma cutter (30). The engine (11) drives the air compressor (21) for producing compressed air for the plasma cutter (30). A pair of compressed air tanks (20) provides for storage of the compressed air. The compressed air tanks (20) are situated at bottom opposite sides of the structure that houses the components of the unit (10) so that the tanks (20) also act as skids for ease of movement of the unit (10) to the next cutting site. The structure that houses the engine (11), electrical generator (12), air compressor (21), plasma cutter (30) and related auxiliary equipment includes suitable covers and access ports. The structure also includes attachment points (31) and devices for ease of lifting and moving the entire unit (10) as needed for cutting work and transport. Compressed air and electric power is supplied to the torch of the plasma cutter (30).

Abstract: The invention features methods and apparatuses for cutting a section of a pipe having a non-linear longitudinal axis. A mounting structure attaches to a first portion of the pipe. A track is connected to the mounting structure and defines a drive plane. A moveable structure is coupled to the track and configured to move circumferentially along the track. A tool holder is connected to the moveable structure and positions a cutting tool relative to a cutting plane in a second portion of the section of pipe, the cutting plane substantially perpendicular to the non-linear longitudinal axis at a cutting location on the pipe. The mounting structure adjusts to position the track such that the drive plane is parallel to the cutting plane, separated from the cutting plane, substantially non-perpendicular to the non-linear longitudinal axis at the first portion on the pipe.