Leak Detection System

Channel ‘Long Ranger’ Subsea – MKII

Dive Works operates the new ‘Long Ranger’ leak detection system which can detect fluorescent dyes, crude oils, lubricating oils and hydrocarbon based control fluids at depths down to 3000m.

The ROV is mounted or diver held, with remote leak detection from distances up to 10m away. The system easily finds leaks in confined spaces where ROV access is not possible.

The system used by Dive Works has ‘long range’ fluorescent sensors. These sensors can be used for detecting Fluorescein, Roemex red dye, Rhodamine, UV dyes, crude oil, lubricating oil, and hydrocarbon based control fluids at distances of up to 10 meters or more. The sensors do not have to pass through the leaked fluid plume to detect; that is, the sensors detect remotely and thus tidal flow direction in relation to the sensor is no longer relevant. Other advantages include riser inspection at a safe working distance and the ability to detect leaks within structures and manifolds where ROV access is not possible.


Features and Benefits

The system comprises a two channel unit that can be used with two fluorometers or one fluorometer plus an acoustic sensor operating simultaneously. One or more sensors are connected to a two channel pressure housed processor board that is mounted on the ROV and wired through the MUX to the umbilical for data transmission to the surface. The processor produces data in operator selected RS232 or RS485 format for transmission to the surface via the ROV umbilical. Power is supplied by the ROV at 24vdc.

The on­board PC displays data as colour time series plots in real time, allowing the operator to easily see changes in signal that indicate the presence of a leak. The software also allows the user to set alarm levels that will provide an immediate response when a leak has been detected and to record data.

Pipeline leak detection systems have been proven worldwide through many successful operations over a number of years. One of the features of the system Dive Works uses is the ease of integration with the ROV and simple operation.


The sensors have a single forward facing light source (like a torch) producing a ‘tuned’ high intensity beam of excitation light that spreads to about 40cm diameter at 3m from the source (and continues spreading as the distance increases). Fluoresced light generated in the leaked fluid is detected by a sensor mounted concentrically around the light source.

By mounting the sensor on the ROV manip or at the forward end of the ROV, quick and easy scanning for leaks is achieved without the need to consider tidal flow direction to ‘capture’ dye. The long range sensor can be mounted alongside a short range sensor with data from both displayed and recorded simultaneously on the ship borne PC. By this method leak location down to component level (e.g. bolt on a flange or a seal) is easily achieved.

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Dive Works Subsea Solutions utilise a fleet of world class Remote Operated Vehicle’s (ROVs), commercial divers and project management expertise to deliver a suite of innovative technology-based subsea solutions to clients in Australia and South East Asia. Contact us today to discuss your next subsea project.