Group News: April 2014
Brace and Leg Void Leak Detection
Bespoke design with remote testing facility
Monitor Systems was asked by Dolphin Drilling to look at replacing their Brace & Void Space detection system on the Borgsten Dolphin Semi-submersible.
Monitor Systems currently have an Anchor Windlass & Bulk Tank Monitoring System onboard the Borgsten Dolphin with remote I/O stations around the rig. The new Brace & Void Space monitoring system was based around the existing hardware located in the rig’s control room.
Design: The installed I/O has a minimum of 20% spare capacity for future expansion; the I/O racks have also been designed and manufactured with enough space for the future installation of I/O cards.
Benefits: The sensors used were IP68 rated for the braces and IP66/67 rated for the void spaces. The advantage of using these sensors combined with interface module (SIL Approved) is that you can carry out a simple ‘remote test’ of the sensor without physically having to open the void spaces to go in and test the functionality of the sensor.
![Borgsten Dolphin Semi-sub](/images/news/Borgsten_rig01.jpg)
Another benefit is that the electronics module of the sensor continuously monitors via frequency evaluation for a number of issues including the strong corrosion or damage on the tuning fork, the loss of vibration and the line break to the piezo drive.
Capacity: The new brace leak and void monitoring system has I/O to monitor 64 sensors within 4 new remote I/O stations. The existing HMI’s previously installed by Monitor Systems for the Anchor Windlass / Bulk Monitoring System were utilised for visualisation.
The complete system scope of work included in-situ rig survey, project management, conceptual design, QA & HS&E management, engineering and manufacture, product supply, FAT, DNV approval, software interrogation and the supply of system documentation.
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