How does it work ?

A transmitter emitting ultrasonic waves is placed inside a cargo hold for instance. An open hatch value is obtained in order to be used as a reference point in the inspection. Ultrasounds passing through sealing arrangement or other areas (crack, holes etc) can be easily detected by a hand-held ultrasonic receiver. Each value exceeding the threshold is compiled in a survey report.

As a complement to the ultrasound test, a visual inspection is usually proposed to determine the good condition of the latter.

What advantages ?

This test can be crucial in order to determine any problems of packing rubber compression or eventual leakages that can affect the hatch covers and cause a risk, not only for the cargo, but also for the crewmembers.

Among all available inspection methods, the ultrasonic test has significant advantages:

• Allows the detection of a lack of compression or contact on the seals
• Localizes precisely the defective areas or leakages (useful to undertake repairs)
• Gives an indication about the compression levels
• Can be performed during bad weather conditions
• Non destructive testing method