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22. <br />= <br />2 <br />fll 2131SV1d3Nd oie/DV <br />S. Filter Requirements (2-9036 through 9039) <br />Pressure and vacuum D.E. - max. 2 GPM/sq.ft., max. 2 1/2 GPM with <br />continuous feeding of filter aid for pools 2000 sq.ft. or more. <br />Rapid sand and gravel: max.3 GPM/sq.ft.; backwash min. 12 GPM/sq.ft. <br />High rate sand - sugoested,max.,and backwash min.: 15 GPM/sq.ft. <br />For filter Model it 4,1&4 7-0-4N- g?-7L1 <br />filter area sq.ft. times number of filters / times max. <br />flow rate per sq.ft. (from above) GPM equals total max. flow <br />rate through filters during operation of pool 72- GPM. <br />This a9unt must be larger than Total) Pump Rate(TPR) 1.5 GPM. <br />OK Not OK . Backwash: OK V- Not OK . <br />T. Recirculation (2-9031 and 9033) <br />1. Max. flow velocities on inlet piping: PVC - 10 ft./sec. and copper - <br />8 ft./sec. Use Williams and Hazen Formula Chart for 1. and 2. <br /> <br />TPR Pipe Size Velocity Friction <br />-Material <br /> <br />ft./sec. Loss-ft. <br /> <br />15 fif <br />-56 <br />copper <br />External bypass required if TPR exceeds <br />bypass ,1.7)- in. Bypass valve (TO Glr <br />2. Max. flow velocities on suction piping: PVC and copper - <br />it Inlets <br />"fr <br />/8/ <br />2 <br />1 <br />Heater <br />It Skimmers <br />/4' <br />/3 <br />/r. <br />1 <br />Main drain <br />75% TPR <br />56 <br />100% TPR <br />7 5 <br />Pipe Size Velocity <br />-Material <br /> <br />ft./sec. <br />rlic <br />t <br />Friction <br />Loss ft. <br />-71 <br />U. <br /> <br /> <br />Pressure gauge on influent and effluent lines. <br />Flowmeter properly located with 10 pipe diameters of straight pipe <br />in front of and 4 pipe diameters behind the flow meter and be <br />capable of easy inspection. <br />Vacuum gauge on suction type filters. <br />Hair and lint strainer on suction side of pump. <br />Perimeter Overflow (2-9042)(pool area over 5000 sq.ft.) <br />Min. 75% of required flow. <br />Channel min. 3 in. deep; bottom width of channel min. 3 in.; opening <br />beneath coping into channel min. 4 in. <br />Channel lip max. 12 in. below top of deck; rounded lip edge 1 to <br />2 1/2 in. thick at top 2 in. <br />Channel outlet min. 2 1/2 in. diameter, max. 15 ft. apart and <br />channel sloped min. 1/4 in./ft. to outlets. <br />Channel drain grates 1 1/2 times area of outlet pipe. <br />Surge tank storage min. 1 gal./sq.ft. of pool surface. <br />Automatic make-up water with manual override for maintaining pool <br />water level.