Sounds very odd. The ammonia cracker is presumably a small process unit that runs at high temperature and some pressure, producing hydrogen that is then bured to heat the furnace? Normally you wouldn't connect a glass container to anything pressurised. If you do, you need to have a suitable pressure reducer and relief/vent system as well as a pressure test and inspection regime for the container.

I'd expect evidence the whole system has been design to a recognised engineering standard, that instruments and controls have the right testing regime, etc. It's presumably pretty small, for jewlelry, but I know of a couple of serious accidents when smallish glass items were overpressured when connected to inmperfectly designed pressure systems.

I suggest you get the system design checked by a competent mechanical or process engineer, who then also ensures that suitable maintenance and operations docuemtns are available and used by peope who understand what could go wrong if they are not fully implemented.