Dimensions Orifice Weld Neck RF flanges ASME B16.36 – Class 2500

Weld Neck Orifice flange Raised Face type


NPS DIA
RAISED
FACE
OUT
SIDE
DIA
MIN
THK
FLG
HEIGHT
FLG
HUB
DIA
HUB
DIA
DIA OF
TAPPING
BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
LENGTH
R O T H X A Tg
1 50.8 160 38.1 92 57 33.5 6.4 108.0 4 1 7/8 150
1.1/2 73.0 205 44.5 111 79 48.3 6.4 146.0 4 1.1/4 1.1/8 180
2 92.1 235 50.8 127 95 60.3 6.4 171.4 8 1.1/8 1 185
2.1/2 104.8 265 57.2 143 114 73.0 6.4 196.8 8 1.1/4 1.1/8 205
3 127.0 305 66.7 168 133 88.9 9.5 228.6 8 1.3/8 1.1/4 230
4 157.2 355 76.2 190 165 114.3 12.7 273.0 8 1.5/8 1.1/2 260
6 215.9 485 108.0 273 235 168.3 12.7 368.3 8 2.1/8 2 350
8 269.9 550 127.0 318 305 219.1 12.7 438.2 12 2.1/8 2 385
10 323.8 675 165.1 419 375 273.0 12.7 539.8 12 2 5/8 2.1/2 490
12 381.0 760 184.2 464 441 323.8 12.7 619.1 12 2 7/8 2.3/4 540
NPS R O T H X A Tg BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
LENGTH
DIA
RAISED
FACE
OUT
SIDE
DIA
MIN
THK
FLG
HEIGHT
FLG
HUB
DIA
HUB
DIA
DIA OF
TAPPING

GENERAL NOTES:

  • Dimensions are in millimeters, except for bolts and bolt holes.
  • Height of Raised Face (RF) in CLASS 2500 is 7 mm.
  • All other dimensions are in accordance with ASME B16.5.
  • Ring joint flanges larger than NPS 3 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).
Measuring lengths of Stud Bolts and Hex bolts

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.