Methods tested for estimating VOC losses from floating roof turnovers

A study of methods to determine the saturation level and saturation rate of organic vapors in the vapor space of floating roof tanks during tank turnover examined oxygen-combustible (O2/LEL) analyzers and canister sampling.Field tests conducted at various US pipeline breakout stations determined the percentage concentration of petroleum vapors in the space under the floating roof with respect to time (vapor saturation rate).O2/LEL analyzers were used for all four tanks to monitor oxygen and lower explosive limit (LEL) levels continuously and to calculate vapor concentrations in the tank's headspace using the measured oxygen levels.With the exception of the Tank 1 test, canister sample...

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