CTM SYRVEY provides hatch cover weather-tightness tests for different types of vessels (bulk carriers, container-ships etc).
Those tests are performed with a visual inspection in order to determine the proper condition of a vessel prior loading.
We use a class type approved ultrasonic equipment (SDT270, approved by Lloyd’s register).
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