Laserfiche WebLink
71 SO Overfill Valve in Tank Shut off level Worksheet <br /> Important: This is meant to be supplemental worksheet and not a substitute to following the installation <br /> manual instructions. All length measurements are in inches. Please contact the Authority Having Jurisdic- <br /> tion(AHA and review local,state,and national codes to determine the regulatory requirements governing <br /> shut-off capacity in your region,as well as take Into account other considerations such as extreme tank tilt! <br /> Take the following measurements with the valve in- <br /> stalled In the tank: <br /> Distance from the 71 SO Inlet tube flange to the cast <br /> lug in the 71SO body(see figures),upper tube length. <br /> Note: the Upper Tube Length must be at least 16"to in- <br /> clude the protective bend In the tube. <br /> (D)= L 3 l Ll <br /> Distance from the 71 SO inlet tube flange to the top and <br /> bottom of lower tube,valve length. <br /> (W)= (D) <br /> (V) Upper <br /> Tube <br /> Distance from the 71 SO inlet tube flange to the bottom <br /> of the tank. Note:If a tank bottom protector is present it <br /> may be necessary to add this thickness to dimension <br /> (OPW 6 11 &b11TP models add 0.6") (W)Valve <br /> (B)= Length, <br /> bottom of <br /> From the tank calibration chart provided by tank manu- cut <br /> facturer find the dipstick number(Y)which corresponds <br /> to the 100%volume <br /> (Y)= V12 To Tank <br /> 1. To determine shut-off percentage: M <br /> Tank <br /> Subtract upper tube length(D)from distance to tank (U)Valve Chart <br /> bottom(8) Length, 100% <br /> (X)=(B)-(D)-2"= top of cut Volume <br /> Dipstick <br /> Using the tank calibration chart provided by the tank <br /> manufacturer determine the tank capacity at the cal- <br /> culated(X)dimension and the 100%volume(Y)tank <br /> capacity. ). <br /> (X)tank capacity in gallons= I z <br /> (Y)tank capacity in gallons= 1,'_1 <br /> SO%=(X)capacity/(Y)capacity x100 = �s.$6 <br /> Note: The overfill valve must be installed per AHJ require- <br /> ments and all applicable local,state,and national codes. If <br /> the overfill valve is set above the allowable shut-off percent- <br /> age the overfil: valve must be removed and replaced. For <br /> reference 40 CFR part 280 Subpart B Section 280.20 overfill <br /> valves should be set to a maximum of 95%. <br /> 2' <br />