Subsea Electrical Tester (Subsea Megger)

 

When a subsea electrical fault such as Low Insulation Resistance (Low IR) occurs, finding it from the surface is difficult. When this occurs in deepwater, pinpointing the exact location with the surface mounted instrumentation is even more complex.

Water Weights in partnership with Davy Systems has developed test instrumentation that identifies electrical faults in power and control umbilicals at the source. Most importantly, it is quick and accurate in an environment where time is expensive.

• The equipment allows for each element of the subsea architecture to be isolated and tested individually and the fault(s) located; this enables repairs to be effected rapidly

• The system is highly portable

• It can operate in any type of work class ROV and is also capable of remote, high voltage testing that is user selectable

At the surface is the Surface Control Unit (SCU) which allows full control of switching of cores, cores to screen, power /comms, selection of the test type to be run, test voltage and other test criteria. Interlocking ensures that incorrect voltages and tests can not be applied to inappropriate cores. A ruggedised laptop provides live feedback of the test results with data trend and logging.

Applications include:

• Integtrity assessment during lay operations
• Post lay electrical testing
• Fault-finding diagnostics
• Schedule maintenance program

Upgrade options available for multi-meter, digital storage oscilloscope, FFT spectrum analyzer, time domain relectometry (TDR)

Water Weights Fact

Benefits of the test locally mean that individual sections can be tested rather than groups - group test you would only get a result for the lowest (worst case) reading. Benefits include: Full identification of sub-sea faults Measurement of degradation over time Change in operator approach to risk supportive of proactive repair strategy

Quick Links

Load Pins
Load & Force Measurement
Mooring System Load Cells
A-Frame Load Monitoring
Underwater Load Cells