V-SLIM Subsea Deployed Line Integrity Monitors.

A Precise and Accurate Electrical Cable Integrity Monitor For Distributed Ungrounded/Floating Electrical Systems.

Subsea intervention solution designed for installation underwater, ensuring subsea distributed networks are ready from day one. Two V-SLIM product variants are available;

  • V-SLIM Eurocard PCBA Designed for installation in OEM subsea distribution and control hardware.
  • V-SLIM Canister A cable integrity monitoring harness, intended for integration in subsea distribution systems.


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Water ingress into subsea electrical cables is the dominant cause of electrical faults in subsea electrical systems. This results in an increase in leakage current, which triggers a low insulation resistance alarm. Continual insulation degradation eventually leads to failure of the circuit. Existing topside-located line insulation monitors only display a single insulation resistance result for the complete subsea system. When the insulation resistance drops, the topside monitor provides no information on the number of faults or their location. Identifying faults often requires a costly subsea fault-finding campaign, which may disrupt production and risks introducing new faults into previously functional connections. Even if the fault can be found and fixed, the entire process must be repeated each time a new fault occurs, providing no long-term added value.

Distribution systems that include subsea-deployed isolation transformer modules pose an additional integrity management challenge. In these systems, a topside-located line insulation monitor can only monitor up to the primary winding of the transformer, effectively covering the main umbilical only. Integrity monitoring of the electrical distribution equipment attached to the secondary side of the transformer, as is now commonly required by field operators, must be addressed by other means. A topside-located device cannot monitor the integrity of the secondary side of a transformer or utilise V-LIFE to recover low insulation resistance faults in that section.

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The V-SLIM was initially developed to provide a solution for subsea located oil & gas production control systems but can also be applied to monitor other types of unearthed electrical systems.

The V-SLIM’s unique ability to measure both total system insulation resistance and downstream insulation resistance provides operators with a comprehensive view of the electrical integrity of the distribution system. Installation of the V-SLIM at strategic locations, either as a retrofit or embedded within OEM equipment (Canister Variant), allows for monitoring of degradation of the remote electrical distribution network as well as fault location using analytics.

When deployed as a standalone integrity monitor on the secondary side of an isolation transformer, V-SLIM fills the gap in critical integrity monitoring of the complete electrical system to provide information which cannot be obtained by a topside-located line insulation monitor. For subsea located systems, the V-SLIM can also be V-LIFE enabled allowing low insulation to be recovered even on systems with remote isolation transformers. This is particularly advantageous as infield umbilicals, electrical flying leads and other distribution equipment on the secondary side is difficult to fault find and costly to replace.

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V-SLIM Products.

Subsea insulation resistance monitoring and healing downstream of transformers, ensuring complete infrastructure oversight.

Two variants are available;

V-SLIM Eurocard PCBA: Designed for installation in OEM subsea distribution and control hardware.

V-SLIM Canister: A cable integrity monitoring harness, intended for integration in subsea distribution systems.

Be V-LIFE Ready

Prevent Cable Failures, Protect Operations  

In subsea energy operations, unplanned downtime is costly and disruptive. Cable faults, such as water ingress or declining insulation resistance (IR), jeopardise reliability, safety, and profitability. Why wait for failures when they can be prevented?

With our advanced line insulation monitor, V-LIM, or our next gen product V-LIM2, or our subsea V-SLIM monitors already installed, V-LIFE, a preventative and protective ‘healing’ solution for low IR in umbilical cables can be activated quickly; restoring system health before system failure. This is the essence of being V-LIFE ready: always prepared, with a solution ready to protect your operations.

To discover more about how to make your system V-LIFE Ready or view our Subsea Solutions Brochure.

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Intelligence Installed: Viper Innovations' Subsea Solutions deliver a state-of-the-art technology ecosystem designed to safeguard subsea cable integrity

Product Features.

  • Measurement of total system insulation resistance and insulation resistance downstream of the unit
  • V-LIFE® – award-winning cable rejuvenation technology
  • Built-in measurement of additional parameters including line voltage, current, frequency, and insulation capacitance
  • Patented measurement technology allowing wires to be routed directly through the V-SLIM with no need for in-line switches or electronics
  • Compatibility with AC or DC systems
  • Compatibility with external IR verification testing activities
  • Timestamped measurement data is logged to internal memory
  • Provides information to enable electrical fault location
  • Minimises subsea intervention costs
  • Mitigation of unplanned production loss
  • V-SLIM Canister: Industry-standard interface compatible with pressure balanced oil-filled (PBOF) hoses enabling PBFO electrical harness integration
  • V-SLIM Eurocard: Standardised single-height (3U) Eurocard format
  • V-SLIM Eurocard: Easy PCBA securing via 5x fixing holes or by slotting the long edges into card guides
  • Electro-Hydraulic Subsea Production Control Systems
  • Monitoring IR downstream of subsea transformers
  • Monitoring and IR recovery of wet-parked umbilicals during FPSO refurbishment