In crude and condensate truck loading operations, when vapor balance loading is required to reduce emissions, oxygen contamination of the tank vapor space can be a major concern. With the introduction of oxygen into the vapor space, an explosive environment may exist creating a safety concern. If VRUs are used to recover the tank vapors, the oxygen contamination of the vapor may cause O2 levels to exceed allowable limits for pipeline feeds, and producers will not be able to put their gas into the gas pipelines. In recognition of this industry problem, AEREON developed the patent-pending Air Defender unit to treat the vapor produced during truck loading operations, remove the O2 and put virtually O2-free hydrocarbon vapors back into the storage tanks. Using proven carbon-bed based technology that AEREON routinely uses in other applications, both a safety and a production issue is solved.