Automatically coiling pipes in spool form with a constant internal pressure

A method for automatically coiling and cutting to size a pipe with a predefined internal pressure with a coiling machine for coiling pipes in spool form, the coiling machine comprising:

• a structure supporting a rotating reel, at least one cutting device for cutting the pipe, a measuring unit for measuring a length of the pipe, and a sealing gripper for hermetically sealing the pipe by crushing and welding an end of the pipe;
• wherein the coiling machine further comprises a feeder for feeding a pipe to the rotating reel in a longitudinal direction;
• wherein the measuring unit is arranged upstream of the at least one cutting device in the longitudinal direction, and the sealing gripper is situated upstream of the at least one cutting device in the same longitudinal direction of feeding;
• the method comprising:
• preparing a pipe section with a sealed head end and extruded with a predefined internal pressure;
• feeding the sealed head end of the extruded pipe section under pressure to the coiling machine with fastening of the head end onto the reel;
• starting coiling of the fastened pipe;
• stopping coiling when a desired length of pipe to be coiled is reached;
• hermetically sealing a tail end of the pipe being coiled, wherein hermetical sealing of the pipe includes a crushing step and a step for welding the crushed edges of the pipe with the sealing gripper;
• cutting the pipe downstream in the longitudinal direction of feeding of the hermetic sealing with formation of new sealed head end of a new pipe section extruded under pressure;
• completion of the spool being coiled, packaging and unloading thereof;
• automatic conveying of the new hermetically sealed head end to the rotating reel for fastening and starting coiling of a new spool;
• and
• restarting the coiling cycle.