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PREVENTATIVE MAINTENANCE Annually, inspect the flapper in the 71 SO to see that it is open by looking down the drop tube opening. Test the 71 SO drop tube seals with CARB procedure TP -201.1 D. If the drop tube seal passes testing, no further mainte- nance is required. If the drop tube fails testing, replace the drop tube seal with OPW P/N: Hl 193lM for 4" Tubes. Re -test the 71 SO drop tube with CARB proce- dure TP -201.1 D. The lower tube o -ring seal DPW P/N: H14840M can also be replaced. If this does not correct the leak the 71 SO needs to be replaced. FOR TESTABLE MODELS ONLY: The socket adaptor can be removed and poppet and float movement and function inspected without removing the valve. See Page 17 for full testing details. If replacement parts are needed for testable models the following items are available: DPW P/N 206741 Testable Inlet Tube 5/A, 206740 Socket Adaptor and Cable Assembly, and 61 SO CAUTION: Do not insert any foreign object into drop tube if flapper is in the closed position. For exam- ple, a tank level measuring stick. This will damage the valve and void the Warranty. ALWAYS check flapper location before "sticking" the tank. If flap- per is in the closed position, the tank is either over- filled and you need to wait until the liquid level goes down or the 71 SO is damaged and needs to be re - 71 SO Performance Specifications This Overfill Prevention Valve has been manufactured and tested to, and met, the following California specifi- cations. Performance Requirement: Leak rate to be less Appendix A than or equal to 0.17 CFH@2.0" W.C. 71 SO Overfill Valve Upper Tube Calculation Worksheet Torque Specification Important: This is meant to be supplemental worksheet and nota substitute to following the installation Taptite Screws, #10-24 thread cutting, 20 in -lbs mini- manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- mum to 35 in -lbs maximum. Testable Models Only: tion (AHJ) and review local, state, and national codes to determine the regulatory requirements governing Socket Adaptor, 1/4' NPT, 3.5 ft -lbs (42 in -lbs) minimum shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. to 5.0 ft -lbs (60 in -lbs) maximum. G� IMPORTANT: Leave these installation instructions Desired tank capacity for shut-off: SO%= / and maintenance procedures with the station opera- Dipstick Number on Tank Chart that corresponds to 100% volume = D_ VZZ(Y) tor. Dipstick Number on Tank Chart that corresponds to SD% (X) _ �' � -(X) Upper Tube Reference NumberZ=Y-X� Upper Tube Depth Inside Tank C = Z-2" 2 Distance from top sealing surface for 71 SO Lip' to inside the �S top of Storage Tank' A= For Non -Testable 71 SO models only In all cases for non -testable 7150 models, the top of the valve body must protrude at least 61/2" into the tank to provide a minimal clearance for proper operation? Additionally the total Upper Tube Length must beat least 16" of length to include the protective bend in the tube. Is C less than 61/2" Yes / No If NO, Upper Tube Length (D)= C + A - If YES, Upper Tube Length (D)= 61/2 "+ A _ Upper Tube Leng h =� Z�� For Testable 71 SO models only In all cases for Testable 71 SO models, the top of the valve body must protrude at least 6 Yz" into the tank to provide a minimal clearance for proper operation' Additionally the total Upper Tube Length must beat least 141/2" of length to include the protective bend in the tube. Is C less than 5" Yes / No If NO, Upper Tube Length (D)= C + A - 1 Y2 " If YES, Upper Tube Length (D)=61/2"+ A -1 Yz " Upper Tube Length = I Sealing surface maybe the top ofthe Face SealAdoptor, the built in sealing ledge inside some spill containers, or on non -vapor tight applications the top of the pipe nipple ' Some Underground Storage tanks utilize a monway system at the top. Make sure to use the top of the storage tank for measure- mentandnottotopofthemanway. Consultyour underground tank manufacturer for height ofthe monway a .. 3 This measurement is taken from the seam where the upper tube is attached to the valve body to the inside of the tank top. 18 19