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FEB -32009 02:59P FROM:BEST POOL SUPPLY (916)379-0913 TO:4442327 P.15 <br />DUAL -DRAIN SYSTEM <br />Vacuum Breaker Backup. As with any dual -drain system, one drain is intended to be a vacuum breaker for the <br />other in the unlikely event a swimmer completely blocks one of the SDX RETRO drains. If this were to happen, the <br />pump is able to safely draw water from the second drain. <br />Dual -Drain Spacing. Most suction safety codes require dual -drains to be installed three feet apart, pipe to pipe, <br />however some codes require three feet between drain covers. For this reason, Dual SDX RETRO piping is spaced <br />three (3) feet, ten (10) inches apart. <br />Vertical Dual -Drain installation. The purpose of the vertical dual -drain installation is to make it less likely two <br />people can approach two drains at once. Effectively, the second drain would be at an individual's feet. <br />SDX RETRO is a circulation drain, not intended to remove debris SDX Retro is a universal replacement drain ewer submerged <br />suction outlet suitable for Single or Multiple Drain use on the wall and floor. This is to keep debris and'$and from collecting on and <br />around the low velocity SDX RETRO cover Do not locate suction outlets on seating areas or on the backrest of such seating areas. <br />The maximum flow rate for each pair of SDX RETRO drains is 200 qpm on the floor --192 gpm on the wait This flow rating allows <br />for pumps up to 3 hp to operate efficiently. For pumps with higher flow rates or systems with multiple pumps on a common manifold, <br />additional SDX RETRO drains may be added. Do note exceed the maximum allowable flow rate stated on the suction fitting <br />DESCRIPTION MAXIMUM SYSTEM FLOW FLOOR MAXIMUM SYSTEM FLOW WALL <br />Two SDX Retro High Flow Safety Drains 200 gpnt (756 Ipm) 192 gpm (726 Ipm) <br />Three SDX Retro High Flow Safety Drains 300 gpm (I 136 Ipm) 288 gpm (1090 Ipm) <br />Four SDX Retro High Flow Safety Drains 400 gpm (1514 fpm) 384 gpm (1456 Ipm) <br />Pipe size. To design an <br />SUCTION PIPE SIZE <br />MAX RESIDENTIAL GPM <br />MAX PUBLIC GPM <br />effirient suction system in <br />11/2 <br />— .. <br />50 <br />37 <br />accordance with national <br />...... <br />-- <br />62 <br />Swimming pool standards, <br />2" <br />82 <br />the following pipe sizing <br />2 1/2" <br />117 <br />88 <br />guideline should be <br />3" <br />181 <br />136 <br />followed. <br />4i <br />813 (200 Max GPM) <br />234 (200 Max GPM) <br />1 <br />am <br />I <br />HEAD LOSS CURVE <br />fuf <br />i <br />Im <br />I I I <br />i l <br />I <br />WNW ]D 0 b Im Ni <br />IJO • Im tli IOo fa0 ir0 un Im NO JIO Jii <br />ib 140 ldD <br />IMw OM <br />