Watertight hatch cover and watertight doors tightness can be check by chalk method or hose methods.
Chalk test watertight doors.
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If there are irregularities in the chalk markings then it is assumed that these areas are not weather tight.
Apply chalk to watertight flat sealing continuously.
Chalk is applied evenly around the knife edge coaming compression bars or panel cross seams of doorways.
The chalk test is a simple means of determining if the gasket is in continuous contact with the knife edge when a closure is dogged.
What is chalk method.
Chalk testing is used for visual inspection of the compression integrity of doors and hatches on vessels that hold the potential for flooding.
The rubber joints are carefully examined.
This method was the traditional way for testing hold cover compression but does not test the watertight integrity of the hold.
Title 46 title 46 part 163 001 doors watertight sliding and door controls for merchant vessels through the 1991 edition abs standard.
Iacs states that this test should be followed by a hose test.
A successful chalk test does not guarantee that a closure is watertight but if the gasket is in good condition and the dogs are properly adjusted it does provide a reasonable assurance of watertight integrity.
Check the watertight door sealing.
Periodically perform either a chalk or light test on all watertight doors to ensure that the knife edge makes contact with the entire door gasket.
Chalk testing is one of the key elements in quality testing at the manufacturing plant.
Close the door tightly then open.
All doors and hatches are chalk tested to make sure the dogs are adjusted properly and the frame was not warped in the manufacturing process.
Shipboard machinery equipment and systems requirements for.
A chalk test is a way of verifying that the gasket in a watertight door is evenly contacting the frame which ensures a watertight seal.
The chalk must have continuously around the watertight sealing it has water tightness.
Ensure that all dogs or closing assemblies move freely and close securely.
Rules for building and classing steel vessels.
