Resource Abstract

Tank Vapor Management

Date Published: 4/30/2021

Resource Abstract

Hydrocarbon vapors, when mixed with air in storage tank headspace, pose a safety risk when compositions reach flammable levels. The presence of air also creates a marketing challenge due in part to the safety risk. In this study, the phase behavior of tank vapors was assessed to better understand and manage tank vapor emissions. Factors influencing the quantity, composition, and phase behavior of the tank vapors were analyzed, and the effect of pressure and air concentration on natural gas liquid (NGL) recovery potential was evaluated. The condensation of tank vapor NGLs was modeled over a range of conditions including pressures of 50 to 500 psia and the presence of air from 0% to 60% on a volume basis. This report provides data illustrating the inhibiting effect nitrogen and oxygen have on NGL recovery.

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