Subsea Construction2023-02-17T13:56:23+00:00

Subsea Construction

Streamline Construction

C-Kore subsea measurement tools eliminate slow and cumbersome manual measurement and downline deployment during construction campaigns. They are used to prove the health of equipment during transit, installation, post-install verification and wet-storage. Faults are found immediately giving time for remediation with time-stamped datalogged results.

C-Kore tools can be used to prove electrical, fibre optic and fluid lines during the installation of umbilicals, jumpers, control modules, down-hole sensors (or anything else). The units save vessel time and are deployed subsea with assets to verify asset integrity all the way until the point to hook-up.

Mobilisation and deployment is simple. The measurement program is automated, dramatically speeding up the testing process and reducing the risk of human error. The tools are not much larger than standard dummy plugs, allowing simple hand-carried mobilisation and easy handling for divers and ROV.

  • Save vessel time and cost, no manual testing required

  • Quickly verify asset health post-install without downlines

  • Simple to use, automated testing and data-logging

The testing tools can be fitted at any stage of the journey from the point of manufacture to final installation on the seabed. They are straightforward to fit, simply replacing the dummy or blanking connectors that are normally fitted during transit. Only official parts from the original connector manufacturers are used.


What our customers say

“The C-Kore unit proved to be a simple and effective way of monitoring the status of the cable during all stages of the operation. The ease of use, the simple way of connection to a [laptop] to download the measurements and the fact that the unit could be left installed on the termination box during deployment of the last cable end makes it easy to recommend this solution for future projects.”
Arnstein Austrheim Lid, Statoil

C-Kore Experience

C-Kore Applications

Electrical Installation

Monitoring electrical assets is essential during construction to identify faults early and permit rectification. The C-Kore Cable Monitor is used to test insulation resistance, continuity and capacitance automatically during transit, install and wet-storage of electrical components. The C-Kore Subsea TDR can be used to characterise electrical cables once installed on the seabed and locate any discontinuities caused by faults.

  • Transport

  • Installation

  • Wet Storage

  • C-Kore Cable Monitor

  • Monitor assets and detects faults

  • C-Kore Subsea TDR

  • Characterise and locate discontinuities

  • Umbilicals

  • Electrical jumpers and flying leads (EFL)

  • Subsea Distribution Units (SDU)

  • Subsea Control Modules (SCM)

Fibre Optic Installation

Testing fibre optics during and after installation is essential to identify faults early and permit rectification. The C-Kore Subsea Optical TDR is used to test fibre health automatically during transit, lay and after installation on the seabed. It can characterise fibres and locate any discontinuities caused by faults.

  • Transport

  • Installation

  • Wet Storage

  • C-Kore Optical TDR

  • Characterise and locate discontinuities

  • Umbilicals

  • Optical jumpers and flying leads

  • Downhole Fibre Optics

Fluid-Line Installation

Fluid lines need to be pressurised during installation to prevent collapse. The C-Kore Pressure Monitor measures and logs pressure readings from hydraulic and fluid lines to ensure pressure is maintained. It connects to the Cable Monitor to display results and multiple Pressure Monitors can be connected for different lines.

  • Transport

  • Installation

  • Wet Storage

  • C-Kore Pressure Monitor

  • Measures and logs pressure readings

  • Umbilicals

  • Hydraulic jumpers and flying leads (HFL)

  • Subsea Manifolds

Well-Head Installation (and Decommissioning)

Before the SCM and data-link are available (or after they have been removed) the state of a subsea well is unknown. This creates risks for divers and the environment if there is an accidental release of pressure. The C-Kore Sensor Monitor can read wellhead sensors to report pressure readings and get data from other types of subsea instrumentation. This improves safety for divers and reduces hydrocarbon release risks.

  • Installation

  • Wet Storage

  • Decommissioning

  • C-Kore Sensor Monitor

  • Measures sensor outputs

  • Well-head sensors

  • Subsea instrumentation

Tools for Construction

CKore Siemens Tronic DigiTRON ROV
C-Kore Pressure Monitor
C-Kore Teledyne ODI Nautilus ROV

C-Kore vs. Traditional Methods

C-Kore tools overcome the issues of traditional testing. They eliminate the need for manual measurement of insulation resistance and lashed together automated continuity measurement systems. Further, these measurement techniques are not possible when components are deployed subsea and in the case of umbilicals the second end must be deployed blind. Without C-Kore the only way to verify installation is with downlines and all the problems they entail, from the slow deployment and dubious reliability of the downlines themselves to the effects of inclement weather on deck-based reading accuracy. Both approaches can easily add many hours to testing, adding up to substantial vessel time.

Savings on personnel can be made by using C-Kore tools, as they are trivial to install and then perform automated measurement and data-logging. There are no delays to departure, as the tools only take a moment to install and a few minutes to obtain the first set of test results. Ideally they are installed on the quayside before assets are even loaded to provide continuous monitoring.

The tools do not require high-voltage permits, simplifying operations. C-Kore units are depth rated and are left in place for subsea deployment and wet-storage, this means the second end of umbilicals and other components need not be installed blind. When removed by ROV, C-Kore will fit in the tooling tray for extremely fast recovery. For divers, C-Kore is lightweight and easy to handle. C-Kore uses an innovative low-voltage testing technique, so divers do not have to retreat during testing and SCMs are safe from damage.

CKore Vs Traditional Testing

CKore unit next to traditional arrangement


  • No specialist personnel required, pre-programmed and automated

  • Start monitoring immediately after supplier FAT on the quayside

  • Suitable for monitoring load-out, long transits, lays and wet-storage

  • All results data-logged for analysis and reporting with built-in tools

Manual Measurement

  • Requires specialist personnel and separate IR and CR arrangements

  • Susceptible to human error and variation, hand-written records

  • Permits and barriers required to conduct testing

  • Humidity and weather affect readings from hand-held equipment



  • Deployed with cable/component for continuous monitoring

  • Measure during deployment and leave in place to monitor wet-storage

  • Recover in ROV tooling tray, diver cage or basket

  • Not effected by adverse weather or environmental factors


  • Haulage, deck-space and sea fastening required for mobilisation

  • Extra time required for deployment and recovery, including vessel step-off

  • Specialist operator required to run test equipment on back-deck

  • Humidity and weather affect readings, downlines susceptible to damage

The C-Kore Rental Service


The first step is to talk to us. We have helped many customers configure C-Kore units for their applications and have a wealth of experience to draw on.

Commonly, after discussing the equipment construction and deployment schedule we pre-configure C-Kore units before they leave the factory so all the end user has to do is remove them from the box and plug them in. Configuration can still be changed later in the field if needed.

We can help you decide:

  • When should a test routine start
    This is typically a scheduled for repeated measurement, with different testing frequency for transit, lay and wet-storage phases. The light or proximity sensors can be used for additional spot measurements.

  • Which lines should be tested
    Multiple combinations of inputs and seawater can be tested with any kind of measurement (IR, CR, TDR, etc)

  • What should be displayed
    All results, a summary, or the worst readings seen can be shown on the built-in display after each test

Every unit is electrically and hyperbaric tested before dispatch and pre-loaded with configuration data if required.


The C-Kore units arrive in small pelican cases, which can be easily hand carried to site and take very little storage space.

It is simple to deploy and use C-Kore tools:

  • Connect
    Plug a C-Kore unit into the equipment to be tested, typically it just replaces the standard dummy plug

  • Start Measurement
    Fit the activation plug to take the units out of transport mode and enable scheduled testing

  • Take Spot Measurments
    At key points an additional reading may be required, use the light or proximity sensor to start a test

  • Results displayed
    Instant feedback on built-in OLED display to see measurement results on deck or subsea

  • Deploy units subsea
    Units remain fitted to equipment when deployed subsea and during wet-storage for continuous monitoring

Every result is datalogged and the units do not need to be recovered until the point when the new component is hooked-up.

C-Kore Umbilical Deployment


When measurement is complete it is easy to recover and return the units:

  • Recover to deck
    Bring the units back quickly and simply in ROV tooling tray (scoop), diver basket or work basket

  • Download Data
    Connect via USB and use a built-in wizard to download full test reports and spreadsheets

It’s simple to demob the units, just place them back in their cases and dispatch via a normal parcel courier, no cranes or haulage required.

C-Kore Transit

Where next?