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O P W 5 3 V B A F L O AT V E N T A LV E S <br /> Federal EPA Technical Standards <br /> Federal EPA technical standards for overfill prevention of petroleum UST's allow <br /> the use of ball float vent valves that restrict the delivery flow when the UST is over- <br /> filled.The EPA requirements state that this flow restriction must occur when the <br /> tank is no more than 90%full.The OPW 53VML series is designed to consistently <br /> and dramatically reduce delivery flow rate. (See OPW 30MV to comply with EPA <br /> standards for a 30 minute warning.) <br /> Important <br /> Installing the incorrect length OPW 53VML for your specific UST application <br /> may result in delivery flow restriction at liquid levels exceeding the 90%maximum <br /> established by EPA.Always consult the appropriate tank charts and determine the <br /> specifics of your UST installation to determine the appropriate length OPW <br /> 53VML.The illustration and instructions below are intended to serve as a guide in <br /> this determination. <br /> Existing Installation Grade Level <br /> (Tanks buried or backfilled) <br /> ♦ Measure distance"I"from a <br /> reference point near grade level to 0 <br /> p e <br /> the top of the extractor cage bar. o R soiao. , <br /> OPW 104A a°.• n'° <br /> ro ° Reference <br /> Point♦ Using the appropriate wrench, Poinf <br /> remove the extractor cage and Manhole or <br /> ON 1 Spill <br /> existing float vent valve. P b®� ,� <br /> Container o :� �5'.a° <br /> ♦Measure distance"II"from the same � o- ' man. a ti °o °'� °_ <br /> aP�rdo Q:a °c •a 0 o,�je$oe.��� Q <br /> referenceg near nt oirade level to OPW 1711T(a �;. ; b. • ° °� <br /> P p q..°.,• ° � °b. 6�'�. b°o.�fl.0 <br /> the inside diameter o-'• 0�;`3q,..o�po,. ' ' I ,O [o�� o .; <br /> of the UST Or, <br /> ?:o,OPW 1611 AV va ar Q' ©bva0 moo;° °�c <br /> usinga dipstick,determine the �° P a4"'-fl.•a •� ''°=oA; :• <br /> p ret nfitting °-0.'^: <br /> distance from the reference point to : b•_•>•..: a: • °' 'l�©g ?° �I°:° `T <br /> the bottom of the UST, and subtract OPW 733V or 233VM Vapor I° �°-- o °••e°•_° a ! a;,.°.'o,•° <br /> the tank inside diameter, recovery/extractor fitting <br /> ♦From the correct tank chart,determine <br /> the distance"IV"that corresponds to 4�; Tank Bun <br /> $ . <br /> ° <br /> 10%of the total UST capacity. o. ..� ;o.q .a e .:A�III�°_a'O:p�:o-. ea'.o:°• <br /> ♦ OPW 5 ° o <br /> 3VML length(VI) II+IV o <br /> I-III a.; p•;a;;o,00 a.° ,, . <br /> UST:4 10%of total <br /> New Installation `°;.a. vl `tonk capacity <br /> 6.O <br /> (Tanks not buried) '/a"vapor IV as determinedfrom appra- <br /> ♦Follow the same procedure above or orifice priate tank <br /> measure and calculate dimension chart <br /> "V"from the inside diameter of the <br /> UST to the end of a 2" npt.pipe <br /> threaded into the extractor cage.The <br /> nominal tight engagement of 2" pipe <br /> threads is J". <br /> ♦ OPW 53VML length(VI) =IV+V <br /> Technical Notes <br /> w For extended manway applications, <br /> the total length of coupling and pipe <br /> extension for the OPW 53VML <br /> should match the length of the <br /> manway extender. <br />