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Seafaring A – Z Alphabet – “U” is for…
Let’s get this rolling with: Ullage – The “Ullage” or “headspace” of a tank or vessel is the unfilled space left to be filled, and describes the empty space in large tanks or holds used to store or carry liquids –usually oil, but can be applied to bulk solids such as grain. Taking an ullage reading is the companion process to taking a “sounding”. However, where a sounding measures the depth of fluid from the surface to the bottom of the tank, an ullage value is the distance yet to be filled.
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