How can I estimate emissions from tank roof landing losses?
Landing losses occur from floating-roof tanks whenever the tank is drained to a level where its roof rests on its deck legs (or other supports). Vapors that occupy the space below the roof are emitted upon refilling the tank (filling losses). Emissions also occur while the roof rests on the supports (standing idle losses). Total landing loss emissions are therefore the sum of the daily standing idle losses and the filling losses over the entire period that the roof remained landed. Landing losses must be determined each time a tank’s floating roof is landed. The emissions determination method detailed in API TR 2567, Evaporative Loss from Storage Tank Floating Roof Landings, or its equivalent, is the preferred method for determining landing loss emissions. This publication is available from API.
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