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1 l - .___----- . �e_-_........_.. ._...__.._.W_....- ..�......1 aPW 5 3 V B L FL01� T VENTI-A—LVES Federal EPA technical standards for overfill prevention of petr-oleunr UST's allow the use ol`ball float vent valves that restrict the delivery flow when the UST is over- filled.The EPA requirements state that this flow restriction must occur when the tank is no more than 90% 1`ull.The OPW 53VML series is designed to wn.,isteritly and dramatically reduce delivery flow rate. (Sec OPW 30MV w comply with 1 I'r1 standards for a 30 minute;warning.) Alrel,vr't:ar�l Installing the incorrect length OPW 53VML for your specific UST application may result in delivery flow restriction at liquid levels exceeding the W/o maxulwin established by EPA.Always consult the appropriate tank charts and determine the specifics of your UST installation to determine the appropriate length OPW 53VML.The illustration and instructions below are intended to scar ve as a guide in this determination. Grade Level il:,jil., I•,rri.•,I ear 1,... ,., I ., � j� �- , .. Measure distance"I" from a referencenealr oint rade level to P g (� I„ the top of the extractor Cage bar. OPW 104A s Manhole or t, Reference �._.` ,. Using the appropriate wrench, OPW 1 spill Point` r � e N r' }.. " ° , . y., remove the extractor cage and Container ' existing float vent valve. v Measure distance"II"from the s u cane OPW]111T Cap ", �—, '• reference point near grade level to the inside diameter of the UST. Or, OPW 1611AV vapors using a dipstick,determine the return titling distance from the reference point to '"•r \t �4 is t: �" the bottom of the UST,and subtract OPW 233V or 233V61 Vapor the tank inside diameter. recovery/exlraclor fitting ,•: 9i• 5l� f From the correct tank char,determine the distance"IV"that corresponds to 4"Tank "Bung" l0% ofthe total USTcapaeitY Fitting W OPW 53VML length(VI)=11+IV- law c'ti, ... .._.r�:... UST ;�~ : 10%of total vapor VI Baa asdeterminedle orifice IV from appro- Follow the same procedure above or priale tank measure and calculate dimension chart "V"from the inside diameter ol'thc .� UST to the end of a 2" opt. pips - -' threaded into the extractor cage.The nominal tight engagement of 2" pipe threads is '," Y OPW 53VML length(VI)=1V+V . For extended manway applications, the total length of'coupling and pipe lam, extension for the DPW 53VML should match the length of the; matnway extender.