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水密艙壁
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水密艙壁(英語:Watertight Bulkhead),或稱隔艙板[1],是一種提升船舶安全性的造船設計和技術,指的是能將船體區分成許多個船艙(英語:Cabin (ship)),使各艙室(英語:Compartment (ship))互不相通的「防水壁」。
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水密艙壁在規範的水壓條件下不滲透水,其將船體內部空間區隔劃分成若干個水密隔艙,一旦某幾個隔艙發生破損進水,水流不會在其間相互流動,如此一來船舶在受損時,依然能具有足夠的浮力和穩定性,進而減低立即沉船的危險。