E-viri
-
Apeland, Kjell Edvard; Berge, Jan Olav; Verley, Richard; Armstrong, Michael; Woodward, Neil
Offshore (Conroe, Tex.), 11/2006, Letnik: 66, Številka: 11Magazine Article
The basic principle of hot-tapping is to establish a new branch pipeline connection to an existing (mother) pipeline while under full pressure. This involves connecting the branch pipe, including a valve, to the mother pipeline, usually by means of welding or mechanical clamp connections, cutting a hole in the pipe wall by a machine attached to the valve, retracting the cutting head, closing the valve, and disconnecting and recovering the cutting machine.
