Steel Catenary Riser Monitoring

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SCRs at vessel hangoff

Features & Benefits

Displays on-line flex joint rotation and flex joint stiffness
Detects progressive failure in flex joints
Raises alarms if discrepancies occur
Retrofitable by divers and ROVs

More Information

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The SCRASSURE riser monitoring system measures key performance parameters of SCRs in support of integrity management, maintenance practices, design validation and improvement of SCR design tools. The measured parameters 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