Rheem P-M407 Operating Instructions - Page 21
Cast Iron Header Asme Models
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FLOW RATES MODEL 206/207 266/267 336/337 406/407 PIPE SIZE 1-1/4"-1-1/2" - 2" 1-1/4"-1-1/2" - 2" 1-1/4"-1-1/2" - 2" 1-1/4"-1-1/2" - 2" MIN. GPM 20 25 35 40 MAX. GPM* 125 125 125 125 *When flow rates exceed maximum GPM an external auxiliary bypass valve is required. See external bypass valve section for details. POLYMER HEADERS CAST IRON HEADERS (ASME) HEAT EXCHANGER PRESSURE DROP TABLES POLYMER HEADER (STANDARD MODELS) FLOW GPM PLASTIC INTERNAL BAFFLE (Manufactured after 11/08) PRESSURE DROP (FT OF HEAD) 206/207 266/267 336/337 406/407 20 4.0 25 4.0 4.6 30 4.0 5.2 35 4.0 5.8 5.2 40 4.6 5.8 5.2 5.2 50 4.6 6.3 6.9 6.9 60 4.6 6.9 6.9 6.9 70 4.6 8.1 9.2 9.2 80 4.6 9.2 9.8 9.8 90 6.9 10.4 10.4 10.4 100 8.1 11.0 12.1 12.1 110 10.4 11.5 13.3 13.3 120 11.0 12.7 17.9 17.9 125 11.5 13.8 20.2 20.2 CAST IRON HEADER (ASME MODELS) FLOW GPM PRESSURE DROP (FT OF HEAD) 206/207 266/267 336/337 406/407 20 1.8 30 2.2 8.0 40 2.5 9.0 9.0 9.0 50 2.7 9.8 9.8 9.8 60 3.3 10.5 10.5 10.5 70 4.3 11.0 11.0 11.0 80 5.5 11.5 11.5 11.5 90 6.8 14.0 14.0 14.0 100 8.2 17.0 17.0 17.0 21