I wonder is whether it's feasible to track these portable bottles by part and serial number. The only way to track life limited parts is by Part number and serial number
Robbery is a fact of life in this industry Robbery is a stringently controlled process carried out and certified by Licensed and approved engineers only. Anyone else removing serialised equipment is invalidating the C of A and rendering the maintenance schedule useless.
from what I hear tracking those items is like a wild goose chase and is it really worth it? Not only is it worth having oxygen, fire extinguishers and megaphones that work when you need them I think you will find compliance with the approved maintenance schedule is a legal requirement.