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Title: Evaporation Loss Measurement For Storage Tanks
Author: Warren A. Parr, Jr.
Source: 2008 International School of Hydrocarbon Measurement
Year Published: 2008
Abstract: In the 1950s hydrocarbon evaporation loss from storage tanks was studied to develop emission estimating equations. At that time, the primary driver for knowing the evaporation rate was system loss control. During the early 1990s, the US Environmental Protection Agency (EPA) began programs for stricter record keeping and reduction of storage tank emission. This forced industry to scrutinize the accuracy of existing evaporation loss estimating equations and to develop improvements to various tank appurtenances in an effort to lower hydrocarbons emissions. Much of the EPA activity was focused on floating roof tanks. This paper will review: Sources of emissions from floating roof tanks Research and development to improve emission loss equations Testing of existing fittings Testing of design improvements to lower emissions Development of EPA approved test protocol for improved equipment designs Future areas of emission research in floating roof tanks

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