"During the Tang dynasty, a gazetteer of Sichuan province stated that at one of these 182 m (600 ft) 'fire wells', men collected natural gas into portable bamboo tubes which could be carried around for dozens of km (mi) and still produce a flame.[287] These were essentially the first gas cylinders; Robert Temple assumes some sort of tap was used for this device.[287]"
Can also find evidence of them sticking a bamboo shoot into the well and lighting the gas that comes out on fire. But not anything concrete about them piping it long distances.
True, but see elsewhere in this thread: there's documentation of fairly extensive piping systems, though specific quantitative assessments are hard to find. I've been looking off-and-on for a few years.
thaumasiotes's comment above was worse than useless.
Can also find evidence of them sticking a bamboo shoot into the well and lighting the gas that comes out on fire. But not anything concrete about them piping it long distances.