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0 P W 5 3 V B A L L <br />Federal EPA Technical Standards <br />0 <br />F L 0 A T V E N T V A L V <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 <br />(yanks buried or backfilled) <br />♦ Measure distance "I" from a <br />reference point near grade level to <br />the top of the extractor cage bar. <br />+ Using the appropriate wrench, <br />remove the extractor cage and <br />existing float vent valve. <br />s Measure distance "if" from the same <br />reference point near grade level to <br />the inside diameter of the UST. Or, <br />using a dipstick, determine the <br />distance from the reference point to <br />the bottom of the UST, and subtract <br />the tank inside diameter. <br />s From (lie correct lank chat, determine <br />the distance "IV" that corresponds to <br />l0% of the total UST capacity. <br />o OPW 53VML length (VI) = If + IV - <br />I - III <br />New Installation <br />ClGmks not buried) <br />♦ Follow the same procedure above or <br />measure and calculate dimension <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 light engagement of 2" pipe <br />threads is X". <br />♦ OPW 53VML length (VI) =1V + V <br />Technical Notes <br />Q 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 />nnanway extender. <br />= <br />Grade Level <br />OPW 1711T(up <br />OPW 161 ]AV vapor <br />return titling <br />OPW 233V or 233VM Vapor <br />recovery/extractor fining <br />ES <br />