How do I completely empty a Calor gas cylinder to cut it?

[spinks]

I am assuming, by heavy ends, Robbo must mean any build up of flammable residue that may be in the cylinder. Propane, Butane and other "anes" like methane, heptane etc etc are whats known as light ends in the refining industry and will contain a minute amount of heavy ends such as naptha or gas oil. thats why the cutting when its full of water is the best option.

Of course I could be barking up the wrong tree completely!!

 

[RogerBoyle]

Haven't seen any advice yet on how the OP should get rid of any heavy ends.

It was posted two above yours LOL

To be super safe fill it with water.

By doing so it purges the gas

 

[Heath Robinson]

You are indeed right. Heavy ends are indeed a black gunk left behind in gas systems. You see it in the evaporator units in LPG-fuelled cars, and all the associated gubbins. Solvents are your friends here.