Minimize evaporation losses by calculating boiloff gas in LPG storage tanks

S. Shiva Shamekhi and N. Ashouri, Faradast Energy Falat Co., Tehran, Iran Liquefied petroleum gas (LPG) is stored and transported in tanks as a cryogenic liquid, at a temperature below its boiling point near atmospheric pressure. Due to heat entering the cryogenic tank during storage and transportation, a portion of the LPG continuously evaporates, creating a gas called boiloff gas (BOG). BOG causes evaporation losses in the LPG supply chain over time. It is imperative to minimize vaporization and displacement losses due to the economic and safety problems that can result from such losses. The amount of BOG depends on the design and operating conditions of LPG plants. In the LPG supply cha