Gasoline Vapor Recovery System

The ARID Membrane CRU (Carbon Retrofit Unit)

Gasoline Vapor Recovery System is installed at high capacity, bulk terminals for reducing hydrocarbon emissions while at the same time increasing loading rack rates. Vapors displaced from cargo tanks at the loading rack are directed to the ARID CRU which uses selectively permeable membranes to separate this stream into a hydrocarbon-rich stream and a hydrocarbon-lean stream. The enriched vapor stream is routed to the existing absorber (or “scrubber”), already present in conjunction with bulk terminals using a dual bed carbon adsorption system. 

These enriched vapors are then converted to liquid phase product and returned back to the bulk storage tanks. The hydrocarbon-lean stream is directed to the carbon adsorption bed, where the bed acts as a “polishing unit”. ARID CRU units have yielded a decrease in measured emission levels far below allowable limits while also increasing the permitted throughput and loading capacity at bulk terminals. One bulk terminal increased their loading rate from 4 arm to 9 arm simultaneous operation after installation of the CRU while maintaining emission levels at 1/60th below the allowable level.