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5 ) Dipstick number (X) = 82 " top of the Face Seal Adaptor in the spill container to the Tank diameter (Y) = 92 " bottom of the tank ( Dim . " B ") . (Y) (X) _ (Z) (9211 , 82 " = 1011) IMPORTANT: Inspect the riser pipe for any foreign ma - terial , Over spray from tank relining or any internal 6) (Z) - 2 = C ( 10 " 2 " = 811) burrs inside of pipe must be removed prior to installa - C = 8 " tion . Failure to have an unobstructed riser pipe may 7) Is 8 " less than 6- 1 /2 " ? prevent proper installation and operation of the valve . The 71 SO is designed for installation into schedule 40 NO Measure the distance from the top of the FSA - riser pipes . The 71 SO cannot be installed into schedule 400 Face Seal Adaptor installed on the riser pipe 80 riser pipes . to the inside, top lip of the storage tank and ob - STEP 29 MARK THE TUBE tain measurement (A) . Use the result from Step 1 and HOW TO LOCATE THE POSITION OF THE 71 SO AT 95% TANK CAPACITY to Upper tube length = C + (A) mark the upper tube . Measure the distance from the seam where the upper tube and valve body meet . Use For testable models only, ending in "T" s Upper Tube a tape measure to mark the calculated upper tube Length = C + (A ) - 1 - 1 /2 " length onto the upper tube . See Figure 2 . ASSEMBLY INSTRUCTIONS Tape measure IMPORTANT* Each of the numbered steps i p n the instal - lation instructions are designed as a CHECK LIST to en - sure proper installation and trouble free operation of the OPW 71 SO Overfill Prevention Valve. Read and follow these steps carefully, checking them Riser Pipe off as you proceed . with Face (A ) Seal Adaptor To Tank (B ) Top (LD . Figure numbers correspond to step numbers for easy ) To Tank reference . Bottom STEP I * MEASURE Install the OPW Face Seal Adaptor and the OPW Thread - on Spill Container on the Fill Riser ( Refer to the Installa - tion Instructions Supplied with the Spill Container) . In - Figure 1 sert a tape measure through the riser pipe and hook it under the inside of the tank in the lengthwise direction . Measure the distance from the top of the Face Seal Adaptor threads inside the base of the spill container bucket just below the drain valve outlet window to the 4" NPT inside, top lip of the storage tank (Dim . "A ") ( See Figure Nipple 1 & 1A) . The top flange on the 71 SO will rest on the Face Seal Adaptor just below the drain valve outlet, and be locked in place between the Face Seal Adaptor and the OPW Spill 4 " nipple that is installed in the spill container with the Container Jack Screw Kit ( See Figure 1 A) . ( For riser pipe configu - Jack Screw rations other than that shown , consult installation Measure to her Kit drawings or use other necessary means to measure Di - for Jack Screw mension "A") . installation O -Ring Seal (Top of Face Seal Adaptor) Face Seal Using a tape measure, measure the distance from the 71SO Adaptor Figure 1A 5