Detecting parameter in flexible pipe system comprising a turret

A method of detecting at least one parameter in an unbonded flexible pipe having at least one armouring layer in a flexible pipe system further comprising:

• a turret for rotationally connecting the unbonded flexible pipe to a floating vessel, said turret being supported by a substantially vertical shaft in the floating vessel and comprising an end-fitting for terminating and securing said unbonded flexible pipe to the turret;
• a swivel device for rotationally connecting the turret to the shaft of the floating vessel and providing a fluid transfer passage between the turret and the floating vessel;
• and
• a sensor system comprising at least one optical fibre integrated in the at least one armouring layer of the unbonded flexible pipe,
• the method comprising the steps of:
• transmitting optical signals into said at least one optical fibre from an optical transmitter of interrogating equipment arranged on said turret;
• receiving optical signals reflected from said at least one optical fibre and detecting therefrom at least one parameter in said unbonded flexible pipe in an optical detector of said interrogating equipment arranged on said turret;
• and
• transferring signals indicative of said at least one detected parameter to receiving equipment on said floating vessel from said interrogating equipment arranged on said turret.