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2. is the Healy CAS Air Breather Assembly considered an tank vent In the context of NEC Article 514, Group D, Division 1 and 2 underground Hazardous Locations? As described in the the bladder onta ned with the CAS and by design,above,t o ovapors are emitted toatmosphere. (Seel t otnot In below) Foot note The Intent of this footnote is oreference not the intent of the State Fire Marshal to endorse any one specific product, n.devl eoor IS is methodology. Description of operation of the Healy Clean Air Separator'•: The Healy Systems, Inc.,Model 9961 Healy Clean Air Separator"' is a sand-alone, completely mechanical device that assists In controlling the gasoline vapor emissions from a gasoline dispensing facility. It consists of a 400-gallon storage vessel with Integral bladder and associated valving. It is connected to the ullaga space of the GDF storage tanks via the venting system of the under ground storage tanks. During normal operation of the GDF,with today's concentrationually operate te of ORVR vehicles approximating 20%,thestorage tarnessulage space will re range. During'closed periods of the G negative(up to 8'WC PN cracking pressure)P GDF,the ullage pressure will usually begin to Increase due to vapor growth inherent in the process of introducing air into the UST's. if the pressure goes slightly above atmospheric the vapor from the USrs will flow Into the Internal er. Conversely, when ORVR and the UST pressure falls below atmospheric,thhedevapor Internal to the bladder i I beling drawn begins back Into the UST until rh In two and oonelly psed half yearsng for the next(installed late September of 2002)of e. The Clean Air Separator to see if being in operation at our C.A.R.B. test site in Sacramento hes been evaluated repeatedly vessel and outer wall of the bladder.To date there has been space qu d found In either area.