Acetylene cylinder construction differs from that of other fuel gas cylinders, which are just shells. This video explains their construction and why it's critical to follow these three safety rules when using acetylene.
I did not know the inside of the tank is porous. that explains a lot. I once heard that you need acetone inside the cylinder to prevent it exploding when they pressurize/fill it. and I now see why it takes awhile for the acetone to settle after transporting a bottle on its side. I dont need any explosions in my shop.
