Propane, a by-product of natural gas processing and petroleum refining, is used in the construction industry for flame cutting and for space heating. It is also commercially used in the sporting goods industry as a fuel source for forklifts and as a fuel for camping stoves and barbecues.
Cylinders are the most common form of delivery for gases. For small quantities or for areas where it is not practical to run piping, cylinders are the mode of choice.
I like that I rarely get calls anymore with complaints about our gas supplier.