Graphite Rupture Disks Inverted Type Features • The best choice for higher burst ratings • Available in nominal sizes 1/2” (13mm) thru 24” (610mm) diameters • Fail-Safe Design: If the disk is damaged or incorrectly installed, it will always burst at or below the marked burst rating • Designed to fit industry standard flanges ASME B16.5, ISO and JIS • Burst ratings 0.25 psig (0.02 barg) to 1,000 psig (68.95 barg) or higher • 0% manufacturing range • Flat surface of the disk contacts the process media • Operating pressures to 90% of the disk’s marked burst pressure. Contact ZOOK for operating ratio for burst pressures below 40 psig (2.76 barg) • Temperature ratings –290°F to +700°F (–179°C to +371°C) Maximum temperature rating without insulation is 430°F • All flange group 2 disks are armored (221°C) or 700°F (371°C) with insulation. Contact ZOOK for higher temperature ratings. The specified temperature shall be at the disk location at the time when the disk is expected to rupture • Many common sizes and pressure ratings are available for RAPID Delivery. Contact ZOOK for more information Sizes in (mm) : 3”(76), 4”(102), 6”(152), 8”(203) to fit ASME B16.5 Class 150 flanges Burst Pressures psig (barg): 125 (8.62) and 150 (10.34) Note: RAPID Delivery Inverted disks are supplied with adhesive tags and are not PED or ASME compliant • ASME (UD) and PED (CE) compliance available Specifications Disk Size MNFA NPS DN Actual ID Full Bore in mm mm in mm in2 ½ 13 ¾ 19 1 25 1-½ 38 2 50 2-½ 64 76 4 5 6 8 Safety Relief Valve Protection 3 15 20 25 40 50 65 80 102 127 152 203 Options 14 356 10 254 12 305 16 406 18 457 20 508 24 610 100 125 150 200 250 300 1.50 2 2.50 3 4 5 6 8 15.7 20.8 25.4 38.1 50.8 63.5 76.2 0.30 0.53 0.78 1.76 3.14 4.78 7.06 101.6 12.56 127.0 19.63 152.4 28.27 203.2 50.02 10 254.0 78.53 12 304.8 113.09 350 13.25 336.5 137.88 1,135 2,025 3,083 4,554 8,103 12,664 18,238 32,270 50,664 72,961 88,954 400 15.25 387.3 182.65 117,838 450 17.25 438.1 233.70 150,773 500 19.25 488.9 291.03 187,760 600 23.25 590.5 424.55 273,902 0.34 0.76 1.36 2.58 3.87 5.77 8.39 14.78 1,664 2,496 3,722 5,412 9,535 25.81 16,651 32.70 21,096 47.24 30,477 - - - - - - - - - - 0.62 0.82 1 mm2 193 341 503 w/ External Vacuum Support in2 - - mm2 - - 219 490 877 Thickness* (Flange Group 1) ASME Cl 150 PN6 / 10 / 16 / 20 JIS 5K / 10K / 16K Standard Disk 0.63 0.63 0.88 0.88 0.88 0.88 0.88 0.88 0.88 0.88 1.13 1.50 2.00 2.25 2.50 2.75 3.00 3.00 Insulated Unit 1.75 1.75 2.25 2.25 2.25 2.25 2.25 2.25 2.25 2.25 2.75 3.38 4.38 4.88 5.38 5.88 6.38 6.38 44.4 44.4 57.1 57.1 57.1 57.1 57.1 57.1 (Flange Group 2) ASME Cl 300 / 600 PN25 / 40 / 50 JIS 20K / 30K Standard Disk 0.625 0.625 1.000 1.000 1.000 1.000 1.250 1.250 111.2 123.9 136.6 149.3 162.0 162.0 1.750 2.250 - - - - - - - 15.8 15.8 25.4 25.4 25.4 25.4 31.7 31.7 44.4 57.1 - - - - - - - Insulated Unit 1.75 1.75 2.50 2.50 2.50 2.50 3.00 3.00 57.1 g g - 57.1 69.8 85.8 44.4 44.4 63.5 63.5 63.5 63.5 76.2 76.2 - 150 1.75 2.13 2.50 3.25 44.4 54.1 63.5 82.5 ASME B16.5 Class 300 2.00 2.50 2.75 3.63 50.8 63.5 69.8 92.2 600 2.00 2.50 2.75 3.63 50.8 63.5 69.8 92.2 1.73 2.13 2.52 3.39 PN6 in mm in mm in mm in mm in mm in mm in mm in mm 16.0 16.0 22.3 22.3 22.3 22.3 22.3 22.3 22.3 22.3 28.7 38.1 50.8 57.1 63.5 69.8 76.2 76.2 4.00 101.6 4.25 107.9 4.25 107.9 3.78 4.75 120.6 5.00 127.0 5.00 127.0 4.59 5.25 133.3 5.75 146.0 5.75 146.0 5.20 6.75 171.4 7.00 177.8 7.75 196.8 8.28 210.3 4.00 101.6 8.63 219.2 9.75 247.6 5.00 127.0 10.88 276.3 12.00 304.8 - - - - - - - - - - - - - - Notes: *Standard disk thickness does not include gaskets. Insulated unit thickness includes all gaskets p Max pressure based on max design Pressure/Temperature of companion flanging selected g Contact ZOOK 13.25 336.5 16.00 406.4 17.63 447.8 20.13 511.3 21.50 546.1 23.75 603.2 28.13 714.5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5.98 7.16 8.15 10.31 12.48 14.69 16.65 18.62 20.79 22.76 26.73 43.9 54.1 64.0 86.1 96.0 116.5 132.0 151.8 181.8 207.0 261.8 316.9 373.1 422.9 472.9 528.0 578.1 678.9 • Disks w/pressure ratings of 25 psig (1.72 barg) and above will support full vacuum w/o additional support • Contact ZOOK Engineering for applications with less than full vacuum or Bak-Pressure • Maximum pressure rating of ASME B16.5 Class 150 flanges is 290 psig (19.99 barg) @ 100°F (38°C). ASME B16.5 Class 300 flanges is 750 psig (51.71 barg) @ 100°F (38°C). The maximum pressure rating is lower at higher temperatures. Reference ASME/ANSI B16.5 • All pressures shown are based on an ambient temperature of 72°F (22°C) • Not all minimum/maximum pressure and temperature combinations are available. Please contact ZOOK for more information • Unless otherwise noted, stated MNFA and Kr values apply to the rupture disk only and does not include the addition of external vacuum supports or insulated units 70 Graphite Rupture Disks
