A wooden plug fitted tightly in the vent of a damaged tank may prevent which situation?
β’ Tank venting and downflooding on damaged tanks β’ How air trapped in a tank affects the flow of liquid into that tank β’ Relationship between free surface and a tank being only partially filled
β’ What happens to liquid flow if the vent is blocked and air cannot easily escape from (or enter) a tank? β’ Does a tank need to be partially full, or completely full, for free surface effects to occur? β’ If you stop a tank from completely filling, what type of stability problem might you still have?
β’ Clarify the difference between free surface and free surface moment β’ Think about whether a tightly plugged vent would more likely stop structural collapse, free surface, free surface moment, or full flooding β’ Remember that free surface effects occur in slack (partially filled) tanks, not in tanks that are completely full or completely empty
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