PE Pipe Technical Catalogue (PDF) - Pipelife Norge AS

Pipelife Norge ASPE CATALOGUE-SUBMARINE APPLICATIONS, PIPELIFE NORGE AS, December 2002.• Detailed sinking procedure must be worked out including technical parameters, necessaryresources, communication systems and emergency procedures• Detailed calculations of the sinking curvatures must be carried out by computer programs• The pulling force in the end shall be approximately 40 tons• The sinking speed shall not exceed 0.3 m/s• The compressor shall work at a pressure up to 7 bar• Air pressure curve as a function of depth shall be calculated• The critical radius of curvature is approximately 50m• The sinking shall be carried out in an continuous process• Concrete weights must be fixed securely• The weather conditions must be satisfactory• The diffuser must be installed as a beam system by use of cranes• The static system during lowering of the diffuser must be calculated• The diffuser must be “mated” to the main pipeline at sea bottom• The sinking shall be carried out under assistance from a supervisor with experience in this fieldGenerally it is recommended to do as much as possible of the installation work from sea surfaceposition. Use of divers shall be minimized. It is also favourable to do all butt welding at themanufacturer’s plant if possible.We hope this introduction has given the reader an idea of how PE-pipes can be applied insubwater applications.In the following sequences we shall deal with the design problems.Side 14 av 84