Tankers Class Marker Practice Test 2025 – The Comprehensive All-in-One Guide for Exam Success!

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What type of deck seal is commonly found aboard tank vessels?

Dry type deck water seal

Wet type deck water seal

The commonly found type of deck seal aboard tank vessels is the wet type deck water seal. This type of seal involves water being maintained in a chamber to provide a barrier against the escape of vapors from the cargo tanks.

In tank vessels, the primary purpose of the wet type deck seal is to prevent the release of any potentially hazardous vapors or gases associated with the cargo, which is crucial for safety and environmental protection. The water acts as a barrier, minimizing the risk of flammable vapors igniting, thus enhancing overall safety onboard.

Additionally, the wet seal helps to mitigate the effects of pressure and vacuum that can occur during loading and unloading operations, providing a reliable and effective method for sealing against cargo vapors. This makes it particularly suitable for the specific operational conditions present on tankers, where the integrity of the cargo containment system is essential for safe operation.

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Vapor tight seal

Pressure seal

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