Class 150 Flange Dimensions Normal pipe size Outside dia of flange Minimum thickness of flange 1/2 3/4 1.1/4 1.1/2 2.1/2 3.1/2 10 12 14 16 18 20 24 O 89 117 108 117 127 152 178 190 216 229 254 279 343 406 483 533 597 635 698 813 Q 11.2 15.9 14.3 15.9 17.5 19.1 22.3 23.9 23.9 23.9 23.9 25.4 28.6 30.2 31.8 35.0 36.6 39.7 42.9 47.7 Overall Welding neck 47.6 57.2 55.6 57.2 61.9 63.5 69.8 69.8 71.4 86.2 88.9 88.9 101.6 101.6 114.3 127.0 127.0 139.7 144.5 152.4 Length Slip-on & socket welding Y 15.9 25.4 17.5 20.6 22.2 25.4 28.6 30.2 31.8 33.3 36.5 39.7 44.4 49.2 55.6 57.2 63.5 68.3 73.0 82.6 Bolt Circle No and Size of Holes O.D of raised face Lap Joint 15.9 25.4 17.5 20.6 22.2 25.4 28.6 30.2 31.8 33.3 36.5 39.7 44.4 49.2 55.6 79.4 87.3 96.8 103.2 111.1 Diam 60.5 82.5 79.5 89.0 98.5 120.5 139.5 152.5 178.0 190.5 216.0 241.5 298.5 362.0 432.0 476.0 539.5 578.0 635.0 749.5 No 4 4 4 4 8 8 12 12 12 16 16 20 20 dia 15 15 15 15 15 19 19 19 19 19 22 22 22 25 25 29 29 32 32 35 R 35 43 51 64 73 92 105 127 140 157 186 216 270 324 381 413 470 533 584 692 Dimensions of Restriction Orifice Plates for ASME B16.5 Raised Face Flanges NPS DIA D3 L N P T 1/2 13 0.24 1.5 30 1.5 3/4 19 0.34 1.5 30 1.5 25 0.42 30 1½ 40 0.64 30 51 30 3 76 1.5 40 102 1.5 10 40 152 1.5 15 40 202 3.5 15 40 10 253 3.5 19 45 12 302 3.5 20 45 10 14 341 20 45 10 16 392 21 50 11 18 443 23 50 13 20 494 25 50 16 24 595 10 29 60 18 900 1500 2500 115 115 120 ASME B16.5 Flange Class NPS 150 300 600 S 1/2 110 110 110 3/4 110 110 110 115 115 120 110 115 115 120 120 125 1½ 110 120 120 125 125 130 110 115 115 125 125 130 115 120 120 125 135 140 115 125 125 130 140 150 115 120 130 135 145 170 120 125 135 145 155 170 10 120 130 145 145 165 190 12 125 135 140 145 165 195 14 130 140 145 150 175 16 130 145 150 155 180 18 130 145 155 160 195 20 135 150 155 165 205 24 135 160 165 190 2205 ASME B16.5 Flange Class NPS 150 300 600 900 1500 2500 DIA D4 1/2 48 54 54 64 64 70 3/4 57 67 67 70 70 77 67 73 73 80 80 86 1½ 86 96 96 99 99 118 105 111 111 143 143 146 137 149 149 168 175 197 175 181 194 206 209 235 222 250 266 289 282 317 279 307 320 358 352 387 10 339 361 399 434 434 475 12 409 422 456 497 520 549 14 450 485 491 519 577 16 513 539 564 573 640 18 548 596 611 637 703 20 605 653 681 697 754 24 716 773 789 836 899 D3 = ± mm TOLERANCES D1 & D2 = ± 1% L = ± 0.1 mm P = ± 0.1 mm D4 = 0/-0.4 mm N = see note S = ± 0.1 mm T = see note Notes: MARKING The Upstream side of the orifice tab shall be stamped at the indicated locations with: - the word UPSTREAM - the Tag Number - the ASME flange class, followed by RF - the nominal pipe size (NPS) - the measured orifice D1 (in mm) - the material of the orifice plate - the type of orifice plate (Square, Restriction etc.) Letter height approx mm WELDING OF TAB Tab may be integral with orifice plate up to and including mm plate thickness In other cases full penetration joint to be applied FINISH OF PLATE The upstream and downstream faces of the orifice plate to a diameter equal to D3 shall have a surface roughness Ra ≤ 0.8 µm ASME B46.1 The remaining annular part (between D4 & D3) of upstream and downstream faces shall have a surface roughness Ra between 3.2 and 3.6 µm ASME B46.1 This finish shall be obtained by machining with a round nosed cutting tool having a 0.8 mm radius at a feed rate between 0.35 and 0.45 mm per revolution CONCENTRICITY The centre of the orifice shall not differ from the centre of the plate by more than 0.1 mm for ≤ NPS and 0.2 mm for > NPS FINISH OF THROAT The throat and outlet cone shall have a surface roughness Ra ≤ 0.4 µm ASME B46.1 All edges shall be sharp and free from burrs, so that when viewed with the naked eye no light is reflected by the corners PLATE THICKNESS The difference between any two measurements of plate thickness, for annular part D1D3, shall not differ by more than 0.001 DN in mm The plate shall not depart from flatness along any diameter by more than 0.01 D3 Tolerance for N shall be: N ≤ mm +0.1/-0.25 mm N > mm +0/-1.5 mm Thickness for annular part D3-D4, may be slightly less, max 0.05 mm, due to surface finishing difference between D1-D3 & D3-D4 (see note 3) General notes: • Dimensions are in millimeters unless otherwise indicated • Allowable pressure difference 20 bar for temperatures up to 400 °C and D1/D3 ≥ 0.1 The thickness of the plate needs to be verified for strength in case the pressure difference is higher than 20 bar and/or the temperature is beyond 400 °C Based on the outcome of the calculation the thickness of the plate needs to be adjusted • DIA D1 & DIA D2 - to be specified by purchaser • Material to be specified by purchaser ... 16 392 21 50 11 18 443 23 50 13 20 494 25 50 16 24 595 10 29 60 18 900 1500 2500 115 115 120 ASME B16.5 Flange Class NPS 150 300 600 S 1/2 110 110 110 3/4 110 110 110 115 115 120 110 115 115 120... 140 150 115 120 130 135 145 170 120 125 135 145 155 170 10 120 130 145 145 165 190 12 125 135 140 145 165 195 14 130 140 145 150 175 16 130 145 150 155 180 18 130 145 155 160 195 20 135 150 155... 18 130 145 155 160 195 20 135 150 155 165 205 24 135 160 165 190 2205 ASME B16.5 Flange Class NPS 150 300 600 900 1500 2500 DIA D4 1/2 48 54 54 64 64 70 3/4 57 67 67 70 70 77 67 73 73 80 80 86