Station form of CNG filling station

Generally, according to whether there is pipeline natural gas at or near the station site, it can be divided into conventional stations, mother stations and sub-stations.
Conventional station form
Conventional stations are built in places where natural gas pipelines can pass, and directly take gas from the natural gas pipeline. The inlet pressure is 0.4Mpa. The natural gas undergoes processes such as desulfurization and dehydration, enters the compressor for compression, and the pressure after compression is 25Mpa. Then it enters the gas vending machine to refuel the vehicle. Usually the conventional gas filling volume is between 600-1000Nm3/h (standard cubic meters per hour).
Mother station form
The mother station directly takes gas from the natural gas pipeline, with an inlet pressure of 1-1.5Mpa. After desulfurization, dehydration and other processes, it enters the compressor for compression, and then is transported to the sub-station by a tank truck with a gas storage cylinder (25Mpa) to refuel the car. It also has the function of a conventional station. Mother stations are mostly built near city gate stations, and the gas filling volume of mother stations is between 2500-4000Nm3/h.
Substation form
Substations are built in places where there are no natural gas pipelines around gas stations. They are generally built in cities to facilitate vehicle refueling, or built in industrial areas of towns where there are no gas pipelines to supply natural gas as energy. The mother station uses a compressor to pressurize and store natural gas, and then a special transport vehicle transports the 25Mpa compressed natural gas to the substation, which then refuels CNG vehicles. For substations in industrial areas, the process flow is briefly described as follows: low-pressure or medium-pressure natural gas is pressurized to 20-25Mpa through a compressor, compressed into a special steel cylinder or pipe bundle, placed on a skid with a traction mechanism, transported to the substation, connected to the gas unloading column, and enters the CNG pressure regulating equipment through the gas unloading system. The high-pressure natural gas is reduced to the pressure required by the user, 0.2-0.4Mpa, and then enters the transmission pipeline network to supply users with natural gas.