In Subsea leak detection

ALD-Acoustic Leak Detector Inspection technique: VERTICAL

Specifications

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Acoustic Leak Detector (ALD) vertical inspection mode

In the ALD vertical mode, the sensor is lowered underneath the survey vessel by mean of a wire line kept vertical by a clump weight (CW). The CW keeps the wire line vertical and the sensor oriented downwards. The POD is also fixed to the clump and data reaches the surface trough a soft cable fixed to the wire line.

This technique allows an accurate inspection of pipelines, flanges or valves without the need of divers or ROV. It is recommended for conditions where depth and current make critical the navigation of the towed fish. Suitable for a depth range of 30-150m. The vessel shall be equipped with a dynamic positioning system and a USBL.

Features

The system is mainly composed by an underwater acoustic sensor, a POD (underwater electronic unit), a transmission line, a receiving unit and a PC based processing and display software. The sensor and the transmission line are different depending on the inspection techniques while the other components are common to all applications: while the sensor is driven along the pipeline or positioned close to a flange or connection, the receiver puts the operator in condition of identifying an eventual leak signal.

Effectiveness: not affected by current, turbidity, visibility, ambient noise.

Sensitivity: detected leaks as small as 0,04 lt/min.

Reliability: 100% OF SUCCESS AFTER 21 YEARS ON THE FIELD.

Experience: 21 years operations, over 90 offshore projects and over 50 subsea leaks.

Qualifications: DNV-GL qualified technology.

Rapidity: fast worldwide mobilization.

NO NEED TO STOP PRODUCTION

HAS DETECTED LEAKS ON BUIRED PIPELINES, FLANGES, RISERS, UMBILICAL, VALVES, GAS LEAK, OIL LEAK , WATER LEAK

 

Technical specifications

SENSOR

  • dimensions: 300 by 250 mm
  • weight in air: 5 kg
  • weight in sea water: 1 kg
  • frequency range: from 1 to150 kHz  
  • acoustic sensitivity: -165dB re 1V/uPa
  • max operating  depth: 3500 m

POD

  • dimensions: 220 by 100 mm
  • weight in air: 4 kg
  • weight in sea water: 1 kg
  • max operating depth 3500 m

Accessories and optional configurations

In this configuration the following optional sensor can be installed: bubble detector, methane detecor, dye detector, crude oil detector.

A front looking sonar can also be installed to monitor the sensor position during the inspection.

ALD® acoustic leak detector is a patented technology of CO.L.MAR., which has benefited from the development of submarine inspection techniques and from the constant updating of equipment, in order to always work with cutting-edge tools and instruments. The ALD® service, including equipment and operators is supplied to promptly detect existing subsea leaks or, during pressure test of subsea installations, to guarantee an immediate inspection in case of pressure loss. ALD is an essential tool for pipeline integrity inspection and generally for IRM (inspection repair maintenance) activities.

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