A comprehensive guide to understanding insulation resistance (IR) & its importance on subsea electrical systems.

After years working alongside the subsea oil and gas industry to manage and remediate failing subsea electrical distribution networks, suffering from low Insulation Resistance (IR), it has been recognised that knowledge gaps can exist when it comes to key decision points. These knowledge gaps warrant prior consideration, to broadening an understanding about what to do with dropping IR. Less clear is when to make the decisions and what the impacts of those decisions are.

The Low IR guide specifically addresses these issues and helps by shining a light on some of the unknowns  

Based on our experience and established chemistry theory, a hypothesis was developed about the effects of seawater on the copper conductors of subsea systems experiencing failing IR. Our PhD student put to this hypothesis to the test over the summer of 2018, through a series of controlled tests on both the V-LIM and on an alternative LIM monitoring device. The findings are quite enlightening.

This Electrical Insulation Resistance (IR) Guide provides valuable insight into failing IR and discusses what the decisions are, their impacts and when to make them


Key facts

  • The importance of IR Integrity
  • Experiencing Low IR & resulting in Copper Loss
  • Decision time
  • Commission V-LIFE
  • Replace hardware
  • Ignore the damage & mitigate the risk
  • How Low can you go?
  • Life with V-LIFE