How a worn naval-gun liner was replaced

Was a naval gun's barrel liner removable, and how was it replaced?

Yes. The barrel was heated and the liner cooled for removal, then contraction fixed the replacement liner in place.

A worn naval gun could be renewed without discarding its entire barrel. Heating the outer barrel made it expand while cooling the liner helped the insert contract and loosen. Once the old liner came out, a replacement was inserted while the barrel remained hot. As the assembly returned to temperature, the barrel contracted around the new liner and held it firmly in place.