As the main cause of vessel loss is sinking, the maintenance, testing and monitoring of watertight hatches, doors and multiple cable transits on vessels is essential. A watertight hatch cover is designed to prevent the passage of water in either direction under a head of water for which the surrounding structure is designed. Many mariners may think hatches are robust, monolithic structures, thereby failing to appreciate the small tolerances on panel alignment and gasket compression. It is better to think of hatches as complex, finely-made structures, to be handled with care.
SOLAS Reg II-1/11.1 it states that hatches and watertight seals must be regularly tested: “Where a hose test is not practicable [sic] it may be replaced by [sic] an ultrasonic leak test or an equivalent test. In any case a thorough inspection of the watertight bulkheads shall be carried out.” The tragedy of the El Faro has exemplified why it is crucial for the watertight integrity test of vessels to be regularly and easily tested by the crew. The importance of continually maintaining seal integrity must take a more prominent position in ship maintenance scheduling.
Ultrasonics is proven to be the quickest, easiest and most efficient method of testing watertight & weather-tight seals of hatch-covers, doors, multiple cable transits. The Portascanner® WATERTIGHT is the most accurate model of its kind – proven to 0.06mm (+/-0.02mm). This is designed primarily to enhance the ease and accuracy with which critical watertight, airtight or weather tight seals can be inspected for leak sites or areas of reduced compression in the seal. The ultrasound generator emits a modulated signal of a specific frequency of ultrasound (in most cases 40,000Hz). The receiver then picks up the signal and converts it into a result indicating watertight integrity testing. The easy to use Portascanner® WATERTIGHT allows crew member to check for failing seals whilst at sea which allows for prompt maintenance.