SCRASSURE - Steel catenary riser monitoring

The SCRASSURE riser monitoring system measures key performance parameters of steel catenary risers (SCR) in support of integrity management, maintenance practices, design validation and improvement of SCR design tools.

The parameters measured by the system include:

  • Flex joint rotation by measuring angles above and below the joint
  • Flex joint bending strain and stiffness by measuring bending strain below the joint
  • Riser touchdown zone response by measuring acceleration.

 

System Description
In the hang-off region, a hardwired INTEGRIpod inclinometer sensor is installed above and below the flex joint. A hardwired INTEGRIstick dynamic curvature sensor is installed below the flex joint. The installation of these packages will be carried out prior to SCR installation. 

In the touchdown zone, five INTEGRIpod motion data loggers (measuring inclination and 3D acceleration) are installed on the riser by ROVs using ROV deployment interfaces.

A topside data acquisition system gathers data from these sensor packages.Various measured parameters are displayed on a screen and compared with preset thresholds. Where these thresholds are exceeded, alarms are raised by the software.


Options

  • ROV deployable INTEGRIpods and INTEGRIsticks for hang-off region
  • Acoustic link for the touchdown zone sensor stations
  • Strain sensors such as ROV deployable INTEGRIstick may be used at the touchdown zone