API MPMS 19.1 pdf download Manual of Petroleum Measurement Standards Chapter 19.1 Evaporative Loss from Fixed-roof Tanks 1 Scope This standard contains methodologies for estimating the total evaporative losses of hydrocarbons fromfixed-roof tanks. The methodologies provide loss estimates for general equipment types based on laboratory,test-tank, and field-tank data. Types of fixed-roof tanks and roof fittings described are for information only....