In Subsea leak detection

ALD® – Acoustic Leak Detector Inspection technique: Diver



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ALD® Diver inspection mode

ALD® DIVER has been designed to detect leak on flanges, valves and other critical components or short pipeline segments. The ALD acoustic sensor is hand held by a diver while, on the support vessel, a specialised operator monitors the acquired data. The equipment design and the inspection procedures have been optimised in order to facilitate the diver job.


An hand held sensor acquires the acoustic data, a short cable connects the sensor to the POD for processing and digital conversion.

The POD is normally fixed to the safety bottle on the diver back. From here a cable takes the data on board the vessel where the ALD receiving station analyses them and displays the results.

The sensor is directive and highly sensitive, includes two handles and floating rings to make it neutral and balanced in salt water.

Technical specifications

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.


• dimensions: 300 by 290 mm

• weight in air: 6 kg

• weight in sea water: 0,5 kg

• frequency range: from 1 to 150 kHz

• acoustic sensitivity: -165dB re 1V/uPa

• max operating depth: 300 m


• 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 sensors can be installed: methane detector, dye detector, crude oil detector.

ALD® – Diver Download

Product sheet – ALD®

ALD® track record