Security Class A systems come with a 30 year warranty, to include coal. Ventinox (316TI)has a lifetime warranty on their liners, except for coal, where the warranty drops to a ten year warranty. However, when they say coal, they mean all types of coal. Anthracite has such a low sulfur content to it that it will have minimal effect on the liner. Metalbestos Class A chimneys come with a standard ten year warranty, except for "certain types of coal". I wrote Metalbestos (selkirk) and asked if Anthracite was of that certain type, and they said that it was not, so the warranty is still good for ten years. Homesaver liners (316, 316TI) come with a lifetime warranty, even if you are burning coal. The NFPA and common sense dictate that every flue should be inspected on an annual basis to make sure that the liner is in good condition.
Another consideration is how the liner is installed, whether it is terra cotta or stainless. If there is a chimney cap installed, then the liner stays dry and the sulfur in the ash remains dormant. Let water in, and then it will start to attack the liner, clay or steel. I have seen hundreds of oil flues (clay) totally destroyed by the effects of the sulfur and water mixing together. All of the SS liner systems have to installed with a chimney cap to maintain their UL listing, because that was how they were tested.
I lost a friend to carbon monoxide poisoning (oil heat), it should have never happened, but it did. I try not to let Murphy sit at any table that I am seated at. For fun, I fly competition aerobatics, so I do not live in a bubble, but I wear a parachute when I fly and practice egress procedures (on the ground) with my eyes closed, so should something happen that never should happen, I am ready.