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Description of Operation - Healy Systems, Inc Clean Air Separator, Model 9931 The Healy Systems, Inc., Model 9939, clean Air Separator is a stand-alone, completely mechanical device that assists in controlling the gasoline vapor emissions form a gasoline dispensing facility. It consists of a 400 gallon storage tank with integral bladder and associated valving. It is connected to the ullage space of the GDF storage tanks via the venting system or any other access to the headspace of the tanks. During normal operation of the GDF, with today's population of ORVR vehicles approximating 20%, the storage tank ullage space will usually operate in the "0" to negative (up to - 8" w.c. PV cracking pressure) pressure range. During `closed' periods of the GDF, the ullage pressure will usually begin to increase due to vapor growth inherent in the process of ingested air changing to gasoline vapor. Should this growth exceed +Y w.c., those excess vapors will escape to atmosphere. The valving on the Model 9839 bladder is set at +1.5" w.c. so that the excess vapors may enter the collapsed bladder and be contained. The tank is equipped with an external relief valve set at 3/" w.c. to allow the bladder to expand and contract within the confined space. Should the vapors accumulate to more than the capacity of the tank, they would be expelled via the +3" w.c. to —8" w.c. PV valve already installed at the GDF. In states having ISD systems, that release would be recorded by the vent sensor and reported in the daily printout. In states not having ISD, an optional hydrocarbon sensor alarm system is available. Both the tank and bladder have capabilities for draining their respective spaces should condensation develop.