ALD® Inspection Techniques

ROV inspection. The sensor is installed on the vehicle which follows the line at a speed of about 0.5/1 knots. This technique allows perfect position control even at great depth. Suitable for flange and line inspections. Optionally a DYE DETECTOR or a HYDROCARBON sensor can be added and used simultaneously to ALD® without any change in the ROV requirements. Full documentation available on request.

TOWED FISH. The sensor, in a “fish” configuration, is towed by a vessel along the pipeline track. This technique allows a higher speed (up to 6 knots) and can be operated from a small vessel. Suitable for line inspections, positioning can be very accurate thanks to an USBL system (optionally provided). Full documentation available on request.

VERTICAL DEPLOYMENT: The sensor is lowered from the vessel side and kept vertical by clump weight. The sensor position is monitored by an underwater positioning system. Suitable for line and flange inspections. Full documentation available on request.

DIVER: the ALD®-DIVER: The diver handles the sensor and drives it around the flange to be inspected, data are sent by a soft-cable to the surface receiver. The ALD® operator is in continuous communication with the diver and monitors the result of data processing. The sensor is neutral in water and very easy to handle, an underwater POD is fixed to the diver safety bottle. Very accurate inspections of limited areas: flanges, valves, short pipeline segments. Full documentation available on request

DIVER: the ALD®-DIVER STAND ALONE The ALD® technology has been made available in a diver - hand held instrument, without any need of connections to the surface the diver operates autonomously. Suitable for inspections of limited areas: flanges, valves, short pipeline segments. Full documentation available on request

DIFFERENTIAL TEMPERATURE SENSOR: This system has been designed and built by CO.L.MAR. for the acquisition, displaying and recording of the temperature of an underwater pipe in respect to sea water temperature. Easy ROV installation. Suitable for pipe in pipe inspections.