Types of CNG stations

TYPE OF CNG STATIONS:-Four types of CNG stations are as follow:
Mother Station: Mother stations are connected to the pipeline and have high compression capacity. These stations supply CNG to both vehicles and daughter stations (through mobile cascades). Typically they have the facility of filling all types of vehicles – buses/autos/cars. The Mother station requires heavy investment towards compressor, dispensers, cascades, pipelines, tubing etc.
Online Station: CNG vehicle storage cylinders need to be filled at a pressure of 200 bars. “On line Stations” are equipped with a compressor of relatively small capacity, which compresses low pressure pipeline gas to the pressure of 250 bar for dispensing CNG to the vehicle cylinder. The investment in an online station is midway between daughter station and mother station.
Daughter Station: The “Daughter Stations” dispenses CNG using mobile cascades. These mobile cascades at daughter stations are replaced when pressure falls and pressure depleted mobile cascade is refilled at the “Mother Station”. The investment in a daughter station is least among all types of CNG stations. There is reduction in storage pressure at daughter stations with each successive filling. As the storage pressure drops, the refueling time increases, while the quantity of CNG dispensed to vehicle also decreases.

Daughter-Booster Station: Installing a booster compressor can eliminate drawbacks of daughter stations. The mobile cascade can be connected to the dispensing system through a booster. Daughter booster (compressor) is designed to take variable suction pressure and discharge at constant pressure of 200 bars to the vehicle being filled with CNG. The investment in daughter booster station is slightly higher than that of daughter station.