For sizes NPS 1/2 (DN 15) through NPS 2 1/2 (DN 65) use Class 1500 (PN 250) flanges.
1
bore
nps
DN 3 80 4 100 5 125 6 150 8 200 10 250 12 300 14 350 16 400 18 450 20 500 24 600
flange outside diameter O 9.50 241 11.50 292 13.75 349 15.00 381 18.50 470 21.50 545 24.00 610 25.25 640 27.75 705 31.00 785 33.75 855 41.00 1040
flange thickness min. t 1.50 38.5 1.75 44.5 2.0 51.0 2.19 56.0 2.5 63.5 2.75 70.0 3.12 79.5 3.38 86.0 3.5 89.0 4.0 102.0 4.25 108.0 5.5 140.0 2
raised welding face neck dia. b a 5.00 127.0 6.19 157.2 q 7.31 185.7 8.50 215.9 10.62 To be 269.9 12.75 specified 323.8 15.00 by 381.0 16.25 purchaser 412.8 18.50 469.9 21.00 533.4 23.00 584.2 27.25 692.2
slip-on, min. c 3.57 90.7 4.57 116.1 5.66 143.7 6.72 170.7 8.72 221.5 10.88 276.2 12.88 327.0 14.14 359.2 16.16 410.4 18.18 461.8 20.20 513.1 24.25 615.9
length tru hub threaded lap counterjoint bore min. min. d e 3.60 3.63 91.4 92 4.60 4.63 116.8 118 5.69 5.69 144.5 145 6.75 6.75 171.4 171 8.75 8.75 222.2 222 10.92 10.88 277.4 276 12.92 12.94 328.2 329 14.18 14.19 360.2 360 16.19 16.19 411.2 411 18.20 18.19 462.3 462 20.25 20.19 514.3 513 24.25 24.19 615.9 614
welding neck f 4.00 101.6 4.50 114.3 5.00 127.0 5.50 139.7 67.38 161.9 7.25 184.2 7.88 200.0 8.38 212.7 8.50 215.9 9.00 228.8 9.75 247.6 11.50 292.1
slip-on, threaded G 2.12 54 2.75 70 3.12 79 3.38 86 4.00 102 4.25 108 4.62 117 5.12 130 5.25 133 6.00 152 6.25 159 8.00 203
2
lap joint H 2.12 54 2.75 70 3.12 79 3.38 86 4.50 114 5.00 127 5.62 143 6.12 156 6.50 165 7.50 191 8.25 210 10.50 267
1
Including Socket Welding Flanges Does not include .25" (6.4 mm) raised face.
2
inches
• 14 •
millimetres