METHODS AND MECHANISMS TO SET A HOLLOW DEVICE INTO AND TO RETRIEVE SAID HOLLOW DEVICE FROM A FLOW PIPE

摘要

A method to set a hollow device (3) into an undersea flow pipe (1) isdisclosed. The hollow device (3) is driven by a flexible pig (4) into theundersea flow pipe (1) to a point where stop means (5) halt the displacementof the hollow device (3), setting it into position.