Most important is that hatch covers of a ship are in soundness and safety condition to avoid leakage of water during transit. Arguably, the most important maintenance item is chalk test, a great simple test for hatch cover condition and seal inspection. It is a most remarkable feature in avoiding loss of cargo as well as ship and crew safety during transit.
The chalk test is an instantaneous warning system that will identify a hatch cover fault within minutes. It is especially necessitated by ships operating in turbulent seas or by ships handling delicate commodities to be preserved from moisture during voyage. Inspection of the hatch cover at regular intervals avoids maritime safety offences and costly damage.
How the Chalk Test Works
Chalk test is performed by rubbing chalk or an object of similar density against hatch covers’ rubber seals or gasketing. The test is extremely easy to perform and can be done by the crew as part of a routine inspection. The secret to the test is pressure that has been applied on hatch covers, and upon closing, they should not allow any air to pass through.
In this chalk test, a small amount of chalk powder is rubbed on the rubber seal or gasket of the hatch cover. The hatch cover is closed and the crew notices where the chalk has been rubbed off. If the chalk smudges or gets rubbed off in some places, then the seal is loose and water leakage happens in bad weather. In this instance, the hatch cover should be moored or moved in a way that will cause it to close properly.
The chalk test is effective because it reveals any gap or deficiency in the sealing system that would otherwise have gone undetected. Small gaps create random water leakage, which is impossible to detect, and this deteriorates the cargo or other safety risks. Rapid and simple chalk testing ensures that any problem is detected before other problems are created in the future.
Advantages of Regular Chalk Testing
Routine daily chalk test is routine shipowner and operator practice, specifically for shipowners and operators having valuable or perishable cargoes as owners or operators. Maintenance test helps business to maintain watertight hatch covers shut tight and, at the same time, keep cargo away from contact with seawater contamination.
Likely the most obvious advantage of application of the chalk test is that it is quite easily done. In relation to higher level diagnostic testing, little apparatus or technical expertise is required for the chalk test and is therefore a low cost hatch cover condition monitoring measure. It is also effective relative to how easily it can be done without withdrawal of the ship from operation for high level inspection.
Besides that, the successful chalk test will prevent costly repair which is brought about by overlooked water infiltration. A hatch cover is not inspected and leaks, there will be great ship and cargo loss. In poor conditions, a misfit hatch cover leakage will result in structural ship damage and reduce the ship strength and integrity. By means of detecting seal failure in the initial stage, the chalk test prevents such a costly mistake.
Moreover, adequate sealing of hatch covers averts ship’s and human safety. Seawater intrusion into a ship may cause unsafe onboard conditions like slippery deck levels, electrical hazard, or disturbing the ship. Free sealing of hatch covers averts hazards by offering a healthier onboard working environment.
Chalk hatch cover testing is simple but extremely convenient to check the hatch covers of a ship and avoid water infiltration. Hatch seal testing every now and then will be saving time and money by identifying faults that will be problematic in the future, keeping cargo dry and secure to carry. It is a definite necessity maintenance practice for any ship, but most especially a ship with sensitive or precious cargoes.
To ship owners and shipping operators, the chalk test is equitable in the standard of the maintenance package. Low cost, ready use, and avoidance of expensive damage make it significant as a preservation influence on the safety and reliability of shipping operations.