Liquefied petroleum gas (LPG) should be filled according to the specified filling quantity, and the gas phase and liquid phase should be stored in bottles at the saturated vapor pressure at the ambient temperature at that time (for example, the saturated vapor pressure of propane at 20℃ is about 800 kPa, and that of n-butane is about 200 kPa).
When in use, the gaseous liquefied petroleum gas is decompressed by the decompressor and sent to the gas appliance, and the liquid liquefied petroleum gas in the bottle absorbs environmental heat and continuously gasifies naturally. When the user's consumption is large and natural gasification cannot meet the use requirements, forced gasification can be used for gas supply. Forced gasification is the continuous gasification of liquefied petroleum gas by using external heat source in a special gasification device. General household users mostly use single bottle gas supply or double bottle switching gas supply, and public * * * buildings, businesses and small industrial users mostly use bottle group gas supply. Supply liquefied petroleum gas to users by tanker. This kind of tank car is called distribution tank car, and its structure is basically the same as that of transport tank car (see liquefied petroleum gas transportation), with a capacity of 2 ~ 5 tons and a filling pump installed on the car. The supply target of distribution tank car is mainly all kinds of users far away from other gas sources. Users bring their own small fixed gas storage tanks (capacity of half a ton to several tons) to receive liquefied petroleum gas. In residential areas far away from the gas supply center, the distribution tanker can also be used as a mobile bottle filling station to fill liquefied petroleum gas (LPG) into users' cylinders.