Laserfiche WebLink
Jul 08 02 03: 42p Eli* Iv Contractors Inc 209461 -n42 p. 6 <br /> ,WWI 11�w <br /> 2. Is the Healy CAS Air Breather Assembly considered an underground <br /> tank vent in the context of NEC Article 314, Group D, Division 1 and 2 <br /> Hazardous Locations? <br /> As described in the above, the UST is 'vented"to the bladder contained within <br /> the CAS and by design, no vapors are emitted to atmosphere. (See footnote <br /> below) <br /> Foot note:The intent of this footnote is for reference only and to provide clarification. It is <br /> not the intent of the State Fine Marshal to endorse any one specific product,device or <br /> methodology. <br /> Description of Operation of the Healy Clean Air Separator-: <br /> The Healy Systems, Inc.,Model 9951 Healy Clean Air Separator�°' is a stand alone, completely <br /> mechanical device that assists in controlling the gasoline vapor emissions from a gasoline <br /> dispensing facility_It consists of a 400-gallon storage vessel with integral bladder and associated <br /> valving, It is connected to the ullage space of the GDF storage tanks via the venting system of the <br /> under ground storage tanks-During normal operation of the GDF,with today's concentration of <br /> ORVR vehicles approximating 20%,the storage tank usage space w411 usually operate in the"0' <br /> to negative(up to 8"WC PN cracking pressure)pressure range.During'dosed"periods of the <br /> GDF,the uliage pressure will usually begin to increase due to vapor growth inherent in the <br /> process of introducing air into the USTs. If the pressure goes slightly above atmospheric the <br /> vapor from the UST's will now into the Internal bladder. Conversely,when ORVR refueling begins <br /> internal the UST pressure fags below atmospheric,the vapor inteal to the bladder will be drawn <br /> back into the UST until the bladder is fully collapsed waiting fortha next cycle. <br /> The Clean Air SeparatorT in over two and one half years(installed late September of 2602)of <br /> being in operation at our C.A.R.B,test site in Sacramento has been evaluated repeatedly to see if <br /> there is any liquid condensation in either the bladder or the space between the inner weu of the <br /> vessel and outerwall of the bladder.To date there has been no liquid found in either area. <br /> i <br />