In the 21st century, the people face to the face that the energy is of lack and the environment is getting worse day by day, the gas fired automobiles featuring the environment protection and energy saving provide wide application range and good chance for natural gas industry. Especially in the last 20 years, the gas-fired automobiles have been developed greatly and formed certain industrialized scale in some developed countries. Up to now 30 million LPG (liquefied petroleum gas) and LNG (liquefied natural gas) station have been built up all over the world. With the full implementation of the large scales “West to East Natural Gas Transportation Project” in china, the gas-fired industry will be given greater development and the construction of the gas filling station will be paid great attention to.
The main equipment of the gas filling station are composed of compressor units, metering equipment, gas purifying and dying device, gas reserving device, priority panel, gas filling pole, and dispenser etc. The gas filling station can be divided into three kinds according to deferent function, i.e. conventional station, gas filling mother station, gas filling daughter station.