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Co.L.Mar – Subsea Leak Detection Equipment

Noise Assessment and Subsea Leak Detection Systems

Co.L.Mar is a specialist provider of acoustic subsea leak detection equipment and noise assessment services for underwater applications.

via delle Pianazze 74,
La Spezia,

Co.L.Mar is a specialist provider of acoustic subsea leak detection equipment and noise assessment services for underwater applications.

The company has been operating in the marine industry since 1982 and is experienced in acoustic engineering, and geophysical investigations. Co.L.Mar is certified ISO 9000 – 2008.

Subsea leak detection systems for pipelines and installations

Co.L.Mar. has released an acoustic subsea leak detection system ALD® (acoustic leak detector) which is able to locate very small leaks on the sea line even in extremely hard environmental conditions. The system and the relative service have been developed for many years and an international patent has been obtained.

It is currently one of the fastest, most accurate and reliable method for sea line leak inspection, especially when an emergency occurs. We are an international leader in this specialist area thanks to our decades of experience and history of delivering proven leak detection solutions.

Subsea leak detection by diver on a flange.
Subsea inspection of an underwater structure.
Co.L.Mar provides acoustic subsea leak detection equipment and noise assessment services for offshore pipeline applications.
AUV is a perfect platform for ALD inspections, due to smaller cost and high-sensitivity.
ALD equipment: surface unit and subsea bottle.
Layout of the ALM system: subsea sensor and surface receiver.
The Acoustic Leak Detection (ALD) captures acoustic data as it scans the pipeline. The acoustic data is transferred to an onboard PC, where it can be processed in real time, then displayed and digitally recorded.
Other subsea leak detection methods are less effective than the ALD at locating leaks in demanding conditions, such as minimal visibility and strong currents.
Our subsea leak detection equipment can be rapidly deployed on small support vessels by our acoustic engineers.
The company delivers underwater noise assessment services that use our proprietary acoustic leak detection equipment.

In the many offshore inspection projects we have worked on worldwide, we have been able to detect leaks as small as 0.2lt/minute.

Underwater pipeline leak inspection

The ALD® underwater pipeline leak detection system features an underwater sensor that collects acoustic data as it scans the pipeline. The acoustic data is transferred online to an onboard receiver, then to a PC where is analysed, displayed and recorded by a proprietary software.

Compared with other leak detection techniques, ALD has the following advantages:

  • Not affected by current, turbidity or pipeline burial
  • No need to stop production
  • High-sensitivity for small leak detection
  • Reliability: as of May 2015, 100% rate of success
  • Rapidity: fast mobilisation worldwide
  • Zero environmental impact
  • ROV, TOWED, DIVER, AUV inspection modes available
  • We served SAIPEM, ExxonMobil, McDermott, SHELL, BP, PETRONAS, TOTAL, TECHNIP, BJ Services, FUGRO and HORIZON

Underwater leak detection and inspection techniques

During years of development, different underwater leak detection and inspection techniques have been defined:

  • ROV inspection – the sensor is installed on the vehicle which follows the line at a speed of about 0.7kts
  • TOWED FISH – the sensor, in a ‘fish’ configuration, is towed by a vessel along the pipeline track
  • DIVER – the handheld sensor configuration is driven by a diver (suitable for flange inspections)
  • AUV – a special version of ALD® can be easily fitted into any AUV payload
  • VERTICAL DEPLOYMENT – the sensor is lowered from the boat in a line kept vertical by ballasts

ALD® as leak contingency plan during hydrotest

During hydrotest of subsea installation a leak contingency plan has to be put in place. This traditionally consists in injecting fluorescine or other kind of dye then proceeding with a visual inspection if required.

But in this case, very often the visual inspection fails because leaks on new installations are typically very small (FJ solder crack or leaking flange) and spotting any sign of dye became impossible. Not to mention if visibility is poor or some current or burial is present. As a consequence, we are often called out on a very urgent base after the failure of the hydrotest of the traditional visual inspection.

For this reason, many clients contract us to standby on-site during any hydrotest so that, with a small cost they can have the best leak detection service guaranteed in case of need.

Also dyes are pollutant and in many area of the world are interdicted, while ALD has zero environmental impact.

So we can provide a more effective and environmental-friendly leak contingency plan during pre-commissioning.

ALM acoustic leak monitoring of subsea installation

On the base of the experience gained in subsea leak inspection we have recently developed a system for permanent monitoring of the most critical areas of subsea installation: manifolds, wellhead, valves, etc.

The system is composed by one of more intelligent sensors to be installed subsea and of a surface station for settings and alarms generation. The subsea units are designed for 25-years life expectance with no maintenance and an operating depth of 2,500m.

Underwater noise measurement services

Co.L.Mar offers underwater noise assessment services that are backed up by our proprietary acoustic equipment and software. We design and build in-house our own acquisition equipment, and have the ability to customise and enhance existing technology for specialised operations.

We are experienced in assessing the acoustic impact of a wide range of man-made structures, including:

  • Research vessels
  • Submarines
  • Platforms
  • Barges
  • Piling operations
  • Racing boats

Our equipment can be rapidly deployed on small support vessels by our acoustic engineers. Once at the assessment site, we take water column temperature and salinity measurements. This data helps us to position the hydrophones at the correct depth for assessment.

Acoustic Leak Monitor

Co.L.Mar’s patent-pending Acoustic Leak Monitor (ALM) leverages the company’s cutting-edge Acoustic Leak Detector® (ALD) technology to identify fluid leaks within marine structures in precise and reliable manner.

ALD® Acoustic Leak Detector

Co.L.Mar’s DNV GL–certified Acoustic Leak Detector® (ALD) is an innovative solution designed to accurately and efficiently detect leaks in a wide variety of marine environments.

Subsea Leak Detection

Co.L.Mar has been a leading provider of subsea leak inspection services for almost two decades, using an innovative acoustic leak detection (ALD) system that is continuously being upgraded to incorporate the latest research and technologies.

Indoor Test Pool

Co.L.Mar's La Spezia site features with a cutting-edge, 8m-deep indoor testing pool equipped with a 4t crane and acoustic calibration facilities.

ALD Leak Inspection from an AUV

In July, CO.L.MAR. took part to an important project, by carrying out inspections of subsea pipes in the Mediterranean Sea.

A Multi-KM3 Sized Neutrino Telescope

KM3NeT, a future European deep-sea research infrastructure, will host a neutrino telescope with a volume of several cubic kilometres at the bottom of the Mediterranean Sea that will open a new window on the universe.

Zohr Gas Field

Zohr Gas field is located within the 3,752km² Shorouk Block, within the Egyptian Exclusive Economic Zone (EEZ), in the Mediterranean Sea.

Mafumeira Sul Project

Mafumeira Sul Project is the second-phase development of the Mafumeira Field located in Block 0, approximately 24km (15 miles) offshore Cabinda province, Angola, at a water depth of 60m.

Kashagan Offshore Oil Field

Discovered in July 2000, Kashagan was described as the largest field found in the past 30 years, the largest outside of the Middle East, with a projected output close to that of the Ghawar field in Saudi Arabia.

Al Wasit Gas Program

The Al Wasit Gas Program includes the development of Arabiyah and Hasbah gas fields located offshore Saudi Arabia in the Arabian Gulf. The project is being developed by Saudi Aramco and is scheduled to be commissioned in 2014.

Another Record for Co.L.Mar

One of our ALD® teams was recently called out in the Middle East for a leak inspection on new subsea installation, including a 16in line and a number of flanges protected by shorouds.

27 June 2016

Co.L.Mar Awarded Saipem Subsea Leak Inspection Contract

After winning an international bid, acoustic subsea leak detection equipment provider Co.L.Mar has been awarded a two-year frame agreement contract with Saipem Spa for the provision of subsea leak inspection services.

17 April 2014

How to Fix a Leaking Flange

Co.L.Mar, a provider of acoustic subsea leak detection equipment, has released a free white paper on Offshore Technology.

31 July 2013

Preventive Leak Detection Provides Standby for Prompt Intervention

Having ALD® equipment and personnel on site during a hydrotest allows for leak inspection to start immediately if needed. The request for preventive leak detection is growing rapidly. In the first months of 2011 we have completed two projects: Co.L.Mar. has been contracted by BJ Servic

10 July 2011

Co.L.Mar Integrates Hydrocarbon Detector in the Ald Sensor

The ALD system in ROV and diver version is equipped with an additional channel which can now host a hydrocarbon detector: the Turner Design – Cyclope 7. The sensor detects crude oil with a minimum detection limit of 0.1ppm. It is now possible to run an acoustic and optical inspection of the pipel

31 December 2010

ALD® Optimised for Use with Drivers

ALD® has been recently optimised for use with divers. This technique is suitable when inspecting flanges, valves or short segments of pipelines. Two solutions are available: ALD DIVER: the diver handles the sensor and drives it around the flange to be inspected, data are sent by a soft

30 November 2010

Co.L.Mar Wins Leak Detection Project in Malaysia

Co.L.Mar has won a new project for ALD: a new success for us and excellent business for our customer. A new, 20km pipeline was found to be leaking during the final hydrotest. After adding dye, the ROV visual survey gave no result. ALD was then mobilised ALD which detected the leak during the ver

30 September 2009

Fast Leak Detection in Egypt

A new project for ALD: a new success for us and an excellent business for our customer. A 60km pipeline from shore to 60mt was leaking. ALD in the towed fish configuration was mobilised and once the inspection started, the leak was detected within 12 hours. The position of th

31 October 2008

Co.L.Mar’s ALD Provides Leak Detection on Well Head

On 9 October 2008 ALD was installed on a Seaeye Coguar ROV for inspecting a well head in the Adriatic Sea. The well head had already been inspected visually without results. In less then one hour ALD detected a leak signal and pinpointed the leak at the back of the control POD. The leak could the

30 September 2008

Co.L.Mar - Subsea Leak Detection Equipment

via delle Pianazze 74
La Spezia

APAC (Malaysia, Singapore, China, Australia, Indonesia, Vietnam, Myanmar, Thailand, Brunei)

Resolve Subsea

Carbone&Vincenzi Consulting

Rua Presidente Antônio Carlos
40 - 20.020-010
Rio de Janeiro, RJ


Dovaheights Energy LLC – Ugo Ekpemu


Diversity Commercial Agencies
United Arab Emirates


Dovaheights Energy LLC – Ugo Ekpemu
United States of America



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