Where the cost of laying down a natural gas pipeline, because of the long distance connection of the CNG refuelling station to the natural gas pipeline becomes unaffordable, the refuelling stations which are too far from the existing pipeline, may be served by means of cylinder truck, filled at a normal refuelling station (mother station), which in turn serve daughter stations, and operate also for industrial and residential application natural gas supply in case of emergency, such as pipeline
service break-down.