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Unformatted text preview: IHS Licensee=TECNA/5935100001 Not for Resale, 05/05/2005 09:50:16 MDT 22 API STANDARD 526 Table 20—Pilot-operated Pressure Relief Valves “H” Orifice (Effective Orifice Area = 0.785 square in.) Material (2) Valve Size ANSI Flange Class Maximum Pressure (psig) Set Pressure Limit Body Inlet by OriÞce by Outlet Inlet Outlet Ð 450¡F to Ð 21¡F Ð 20¡F to 100¡F Outlet Pressure Limit (1) Center to Face Dimensions (in.) 500¡F 100¡F Inlet Outlet 170 600 1200 1795 2995 4990 170 600 1200 1795 2995 4990 285 285 285 740 740 740 285 285 285 740 740 740 51/8 51/8 51/8 63/8 63/8 63/8 53/8 53/8 53/8 69/16 69/16 7 47/8 47/8 47/8 63/4 63/4 63/4 47/8 47/8 47/8 63/4 63/4 63/4 170 480 955 1435 2390 3980 170 480 955 1435 2390 3980 275 275 275 720 720 720 275 275 275 720 720 720 51/8 51/8 51/8 63/8 63/8 63/8 53/8 53/8 53/8 69/16 69/16 7 47/8 47/8 47/8 63/4 63/4 63/4 47/8 47/8 47/8 63/4 63/4 63/4 140 360 720 1080 1800 3000 140 360 720 1080 1800 3000 275 275 275 720 720 720 275 275 275 720 720 720 41/8 43/8 43/8 415/16 415/16 415/16 47/8 47/8 47/8 57/8 57/8 57/8 41/2 41/2 41/2 43/4 43/4 43/4 43/4 43/4 43/4 51/2 51/2 51/2 180 465 930 1395 2330 3880 180 465 930 1395 2330 3880 275 275 275 720 720 720 275 275 275 720 720 720 41/8 43/8 43/8 415/16 415/16 415/16 47/8 47/8 47/8 57/8 57/8 57/8 41/2 41/2 41/2 43/4 43/4 43/4 43/4 43/4 43/4 51/2 51/2 51/2 Temperature Range, Ð 20¡F to 500¡F Carbon Steel 11/2H3 11/2H3 11/2H3 11/2H3 11/2H3 11/2H3 2H3 2H3 2H3 2H3 2H3 2H3 Austenitic Stainless Steel 11/2H3 11/2H3 11/2H3 11/2H3 11/2H3 11/2H3 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 150 150 300 300 300 150 150 150 300 300 300 285 740 1480 2220 3705 6170 285 740 1480 2220 3705 6170 Temperature Range, Ð 450¡F to 500¡F 2H3 2H3 2H3 2H3 2H3 2H3 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 150 150 300 300 300 150 150 150 300 300 300 275 720 1440 2160 3600 6000 275 720 1440 2160 3600 6000 275 720 1440 2160 3600 6000 275 720 1440 2160 3600 6000 Nickel/Copper Alloy 1H2 1H2 1H2 1H2 1H2 1H2 11/2H2 11/2H2 11/2H2 11/2H2 11/2H2 11/2H2 150 300 60...
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