API MPMS CH 19.2

Description

Contains methodologies for estimating the total evaporative losses of hydrocarbons from external floating-roof tanks (EFRTs), freely vented internal floating-roof tanks (IFRTs), and domed external floating-roof tanks (domed EFRTs). The methodologies provide loss estimates for general equipment types based on laboratory, test-tank, and field-tank data. Types of floating roofs, rim-seal systems, and deck fittings are described for information only. The equations estimate average annual losses from floating-roof tanks for various types of tank construction, floating-roof construction, rim-seal systems, and deck fittings, as well as for various liquid stocks, stock vapor pressures, tank sizes, and wind speeds (EFRTs). The equations were developed for: a. stocks with a true vapor pressure greater than approximately 0.1 psia, b. average wind speeds ranging from 0 miles per hour (mph) to 15 mph (EFRTs), and c. tank diameters greater than 20 ft. When this standard is used to estimate losses f