![]() ![]() The Portascanner ® WATERTIGHT has a “MODE” button which instantly converts linear readings into dB readings, which is designed so that the crew can really easily comply with regulations. The converted linear reading can then be used to comply with regulations, as per the above. Therefore, we suggest testing in the linear scale and then converting to dB as this is easier for the crew. It is easier to work out 10% in the liner scale because of this. To counteract this problem, the Portascanner ® WATERTIGHT can test for leak sites in both decibel (dB) and in the linear scale.Īs you can see, in the below graphs showing both the linear and dB scales, the linear scale increases at a constant rate, unlike the decibel scale. This reading must be reported in decibel (dB) to comply with regulations.Īs explained below, calculating 10% of the decibel scale can be complex. above 10% of the OHV shall mean that the hatch cover is considered not to be weather tight and that corrective action to gaskets and drains is required.”DNV GL states that anything under 10% of the open hatch cover reading is considered weathertight. ![]() ![]() The design and the condition of the hatch cover, the coaming and the drainage arrangements It is important to note that this conversion assumes a reference voltage or power level. By raising 10 to the power of (dBV/20), the formula converts the dB value to a linear voltage value. from 1 dB to 10% of OHV shall mean that the hatch cover is considered weathertight, subject to verifying The conversion formula utilizes the logarithmic nature of the decibel scale, where a change of 10 dB represents a tenfold increase or decrease in power or voltage. Tightness Testing of Hatches With Ultrasonic Equipment with the world-leading ABS Approved & RINA Accepted Portascanner® WATERTIGHT can check any critical watertight or airtight seal for leak sites, with results in decibel and mathematical linear.ĭNV GL – Service Suppliers Performing Tightness Testing of Hatches With UltrasonicĮquipment on Ships, High Speed and Light Craft and Mobile Offshore Units. ![]()
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