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Title: Evaporation Loss Measurem Ent From Storage Tanks
Author: Eric Stricklin
Source: 2014 International School of Hydrocarbon Measurement
Year Published: 2014
Abstract: Evaporation from fixed and floating roof storage tanks is a major source of product loss in the crude oil industry. Evaporation is a natural phenomenon describing when a liqui d turns into a gas. A liquid will tend to evaporate depending on its vapor pressure. A liquids vapor pr essure is dependent on the surface temperature and composition of the liquid. Evaporation losses should be minimized to help maximize company revenue, meet regulatory requirements, and reduce greenhouse gas emis sions. The United States Environmental Protection Agency (EPA), state, and local government s are implementing stricter regulati ons on volatile organic compounds (VOCs) and greenhouse gas (GHG) emissions which resu lt from storage tank evaporation. The accurate quantification of evaporative losses fr om storage tanks is imperative given the impact to the companys bottom line and the environment. The American Petroleum Instit ute Manual of Petroleum Measurement Standards (API MPMS) Chapter 19 details equations for estimating the average annual evaporation loss from storage tanks. These equations are based on test tank and field tank data and have been revised since initial publication for more accurate estimations.

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