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Flexible Flowlines - Structural Performance

The Industry Challenge:

Flexible subsea flowlines are susceptible to mechanical damage due to combinations of torsion, bending, tension and external and internal pressure that can occur during installation and operation.  

Field tests, referred to as DIP tests, are where a section of flowline is suspended from a ship with the lower end anchored to the sea floor.  

Various loading conditions and bending geometries can be simulated by moving the ship relative to the anchor point.  The motion of the ship on the waves can also impose cyclic loading conditions. 

Achieving the desired loads during field testing can be challenging due to the motion of the ship and changing weather conditions.

How We Help:

C-FER has developed various testing systems that can subject flexible flowline specimens to a broad range of loading conditions which simulate DIP tests and other operating and installation conditions.  

Tests typically include combining multiple loading mechanisms such as external pressure and torsion or internal pressure and bending to evaluate how the flexible flowline performs and to understand the consequences of the different failure modes.

 Active control of the applied loading conditions and multi-channel monitoring of the specimen response provides detailed information to assist in specifying safe operating ranges and improving the equipment design.

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