450f to 76f 75f to 21f 20f to 100f 101f to 450f 451f

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Unformatted text preview: 0:16 MDT 16 API STANDARD 526 Table 14—Spring-loaded Pressure Relief Valves “R” Orifice (Effective Orifice Area = 16.00 square in.) Materials (2) Valve Size ANSI Flange Class Maximum Pressure (psig) Conventional and Balanced Bellows Valves Spring Materials (3) Outlet Pressure Low Carbon Carbon Carbon High High Limit (1) Temper- Steel or Steel or Steel or Temper- Temperature Chrome Chrome Chrome ature ature ConvenAlloy Alloy Alloy Alloy Alloy Alloy tional Bellows Steel Steel Steel Steel Steel Steel Valves Valves Body/Bonnet Inlet by OriÞce by Outlet Inlet Outlet Center to Face Dimensions (in.) Ð 450¡F to Ð 76¡F Ð 75¡F to Ð 21¡F Ð 20¡F to 100¡F 101¡F to 450¡F 451¡F to 800¡F 801¡F to 1000¡F 100¡F 100¡F Inlet Outlet 60 60 100 100 60 60 100 100 97/16 97/16 97/16 97/16 91/2 91/2 101/2 101/2 100 300 60 100 60 100 97/16 97/16 91/2 101/2 20 20 230 300 60 60 100 100 60 60 100 100 97/16 97/16 97/16 97/16 91/2 91/2 101/2 101/2 60 60 100 100 60 60 100 100 97/16 97/16 97/16 97/16 91/2 91/2 101/2 101/2 60 60 100 100 60 60 100 100 97/16 97/16 97/16 97/16 91/2 91/2 101/2 101/2 Temperature Range, Ð 20¡F to 800¡F Inclusive --``,,,`,``,,`````,,,,,`,,,``-`-`,,`,,`,`,,`--- Carbon Steel Chrome Molybdenum Steel 6R8 6R8 (4) 6R10 6R10 150 300 300 600 150 150 150 150 100 100 230 300 100 100 230 300 80 100 230 300 Temperature Range, 801¡F to 1000¡F Inclusive 6R8 6R10 300 600 150 150 100 300 Temperature Range, Ð 450¡F to 1000¡F Inclusive Austenitic Stainless Steel 6R8 6R8 (4) 6R10 6R10 150 300 300 600 150 150 150 150 55 55 150 200 100 100 230 300 100 100 230 300 100 100 230 300 80 80 230 300 Temperature Range, Ð 20¡F to 600¡F Inclusive Nickel/Copper Alloy (5) 6R8 6R8 (4) 6R10 6R10 150 300 300 600 150 150 150 150 100 100 230 300 100 100 230 300 100 100 230 300 Temperature Range, Ð 20¡F to 300¡F Inclusive Alloy 20 (6) 6R8 6R8 (4) 6R10 6R10 150 300 300 600 150 150 150 150 100 100 230 300 100 100 230 300 Notes: 1. Outlet pressure limit for temperatures above 100¡F shall not exceed the rating in ANSI/ASME B16.34. 2. Materials given are minimum requirements for the pressure and temperature ratings. Other suitable materials may be used, as required, for the service involved. 3. Chrome alloy springs may be used above 450¡F. 4. Set pressure limited for low pressure applicat...
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