Dimensions Orifice Weld Neck RF flanges ASME B16.36 Class 900


Weld Neck Orifice flange Raised Face type

OTHER PRESSURE CLASSES

300
600
900
NPS DIA
RF
OUT
SIDE
DIA
MIN
THK
FLG
HGT
FLG
HUB
DIA
HUB
DIA
DIA OF
TAB
R O T H X A Tg
1 50.8 125 36.6 81 54 33.5 6.4
1.1/2 73.0 155 36.6 84 70 48.3 6.4
2 92.1 165 36.6 84 84 60.3 6.4
2.1/2 104.8 190 36.6 87 100 73.0 6.4
3 127.0 240 38.1 102 127 88.9 9.5
4 157.2 290 44.5 114 159 114.3 12.7
6 215.9 380 55.6 140 235 168.3 12.7
8 269.9 470 63.5 162 298 219.1 12.7
10 323.8 545 69.9 184 368 273.0 12.7
12 381.0 610 79.4 200 419 323.8 12.7
14 412.8 640 85.8 213 451 355.6 12.7
16 469.9 705 88.9 216 508 406.4 12.7
18 533.4 785 101.6 229 565 457.2 12.7
20 584.2 855 108.0 248 622 508.0 12.7
24 692.2 1040 139.7 292 749 609.6 12.7

Weld Neck Orifice flange
NPS BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
LENGTH
1 88.9 4 11/16 5/8 125
1.1/2 114.3 4 13/16 3/4 135
2 127.0 8 11/16 5/8 125
2.1/2 149.2 8 13/16 3/4 135
3 190.5 8 1 7/8 150
4 235.0 8 1.1/4 1.1/8 180
6 317.5 12 1.1/4 1.1/8 195
8 393.7 12 1.1/2 1.3/8 230
10 469.9 16 1.1/2 1.3/8 240
12 533.4 20 1.1/2 1.3/8 260
14 558.8 20 1.5/8 1.1/2 280
16 616.0 20 1.3/4 1.5/8 290
18 685.8 20 2 1.7/8 330
20 749.3 20 2.1/8 2 355
24 901.7 20 2 5/8 2.1/2 445

General Notes..

  • Dimensions are in millimeters, except for bolts and bolt holes.
  • Height of Raised Face (RF) in CLASS 900 is 7 mm.
  • All other dimensions are in accordance with ASME B16.5.
  • Ring joint flanges larger than NPS 12 will require angular meter taps.

Notes..

  • Other NPT sizes may be furnished if required.
  • Bolt lengths for raised face flanges include allowance for orifice and gasket thickness
    of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include
    allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
  • Bore (B) is to be specified by the purchaser.
  • The length of the Stud Bolt does not include the height of the chamfers (points).

Tolerances
Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.

Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face shall be..

  • ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4
  • ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger

Bore Diameter

  • Bore diameter tolerance (Welding Neck flanges only) is ±0.5% of nominal value.


Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

Measuring lengths of Stud Bolts


Hex bolts are measured from under the head to the top of de bolt


Measuring lengths of Hex bolts




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