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Views: 62 Author: Lily Guo Publish Time: 2016-01-08 Origin: Site
Special Flanges are basically identical to standard flanges, but have a number of special features. Orifice flange is one special flange.
Orifice Flanges are intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure "Tappings", mostly on 2 sides, directly opposite each other, are machined into the orifice flange. This makes separate orifice carriers or tappings in the pipe wall unnecessary.
On the image above a set Orifice Flanges is shown, where the tappings are sealed with a plug, and where a jack screw is machined. This jack screw is used to facilitate separating the flanges for inspection or replacement of the "Orifice Plate" and gaskets.
The range of orifice flanges covers all standard sizes and ranges, and all common flange materials.Flanges are available in Welding Neck, Slip On, and Threaded form, and are typically supplied with two ½" NPT tappings in each flange.
Notes:
ASME B16.36 covers Dimensions and dimensional tolerances from orifice flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. Coverage is limited to the following flanges:
Welding Neck Classes 300, 400, 600, 900, 1500, 2500
Threaded Class 300
Slip On Class 300
Drawings and dimensions:
ASME B16.36-2006 ORIFICE FLANGES | |||||||||||||
CLASS 300 | CLASS 600 | CLASS 900 | CLASS 1500 | CLASS 2500 | |||||||||
NOMINAL | THICKNESS | LENGTH | THICKNESS | LENGTH | THICKNESS | LENGTH | THICKNESS | LENGTH | THICKNESS | LENGTH | NOMINAL | ||
MM | INCH | T | LTB | T | LTB | T | LTB | T | LTB | T | LTB | MM | INCH |
25 | 1 | 36.6 | 83 | 36.6 | 83 | 38.1 | 90 | 38.1 | 90 | 38.1 | 99 | 25 | 1 |
40 | 1 1/2 | 36.6 | 86 | 36.6 | 86 | 38.1 | 96 | 38.1 | 96 | 44.5 | 118 | 40 | 1 1/2 |
50 | 2 | 36.6 | 86 | 36.6 | 86 | 38.1 | 109 | 38.1 | 109 | 50.8 | 134 | 50 | 2 |
65 | 2 1/2 | 36.6 | 89 | 36.6 | 89 | 41.3 | 112 | 41.3 | 112 | 57.2 | 150 | 65 | 2 1/2 |
80 | 3 | 36.6 | 89 | 36.6 | 89 | 38.1 | 109 | 47.7 | 124 | 66.7 | 175 | 80 | 3 |
100 | 4 | 36.6 | 92 | 38.1 | 109 | 44.5 | 121 | 54 | 131 | 76.2 | 197 | 100 | 4 |
150 | 6 | 36.6 | 100 | 47.8 | 124 | 55.6 | 147 | 82.6 | 178 | 108 | 280 | 150 | 6 |
200 | 8 | 39.7 | 112 | 55.6 | 140 | 63.5 | 169 | 92.1 | 220 | 127 | 325 | 200 | 8 |
250 | 10 | 46.1 | 118 | 63.5 | 159 | 69.9 | 191 | 108 | 261 | 165.1 | 426 | 250 | 10 |
300 | 12 | 49.3 | 131 | 66.5 | 163 | 79.2 | 207 | 123.9 | 290 | 184 | 171 | 300 | 12 |
350 | 14 | 52.4 | 143 | 69.9 | 172 | 85.9 | 220 | 133.4 | 305 | 350 | 14 | ||
400 | 16 | 55.6 | 146 | 76.2 | 185 | 88.9 | 223 | 146.1 | 318 | 400 | 16 | ||
450 | 18 | 58.8 | 159 | 82.6 | 191 | 101.6 | 236 | 162 | 334 | 450 | 18 | ||
500 | 20 | 62 | 162 | 88.9 | 197 | 108 | 255 | 177.8 | 363 | 500 | 20 | ||
600 | 24 | 68.3 | 169 | 101.6 | 210 | 139.7 | 299 | 203.2 | 413 | 600 | 24 | ||
