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ALD-Acoustic Leak Detector Inspection technique: VERTICAL

Specifications

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ALD-Acoustic Leak Detector Inspection technique: VERTICAL

The ALD sensor is lower 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 a sensor to acquire and pre-process the acoustic data, a POD for pre-processing and digital conversion, a transmission line to take them on the vessel, a receiver for hardware processing and an PC based software to analyze and display the results.

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 sesnor 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.

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ALD track record