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

Weld Neck Orifice flange - Ring Type Joint

NPS OUT
SIDE
DIA
MIN
THK
FLG
HT
FLG
GRV
NO
PITCH
DIA
GRV
DEPTH
GRV
WIDTH
R
BTM
HT
OVAL
RING
HUB
DIA
HUB
DIA
DIA OF
TAP
BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
L
O T H P E F R W X A Tg
1 160 38.1 92 R18 60.33 6.35 8.74 0.8 25.4 57 33.5 6.4 108.0 4 1 7/8 160
1.1/2 205 44.5 111 R23 82.55 7.92 11.91 0.8 27.0 79 48.3 6.4 146.0 4 1.1/4 1.1/8 190
2 235 50.8 127 R26 101.60 7.92 11.91 0.8 27.0 95 60.3 6.4 171.4 8 1.1/8 1 195
2.1/2 265 57.2 143 R28 111.13 9.53 13.49 1.5 30.2 114 73.0 6.4 196.8 8 1.1/4 1.1/8 215
3 305 66.7 168 R32 127.00 9.53 13.49 1.5 30.2 133 88.9 9.5 228.6 8 1.3/8 1.1/4 240
4 355 76.2 190 R38 157.18 11.13 16.66 1.5 33.3 165 114.3 12.7 273.0 8 1.5/8 1.1/2 275
6 485 108.0 273 R47 228.60 12.70 19.84 1.5 36.5 235 168.3 12.7 368.3 8 2.1/8 2 370
8 550 127.0 318 R51 279.40 14.27 23.01 1.5 39.7 305 219.1 12.7 438.2 12 2.1/8 2 405
10 675 165.1 419 R55 342.90 17.48 30.18 2.4 47.6 375 273.0 12.7 539.8 12 2 5/8 2.1/2 515
12 760 184.2 464 R60 406.40 17.48 33.32 2.4 50.8 441 323.8 12.7 619.1 12 2 7/8 2.3/4 570
NPS O T H GRV
NO
P E F R W X A Tg BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
L
OUT
SIDE
DIA
MIN
THK
FLG
HT
FLG
PITCH
DIA
GRV
DEPTH
GRV
WIDTH
R
BTM
HT
OVAL
RING
HUB
DIA
HUB
DIA
DIA OF
TAP

GENERAL NOTES:

  • Dimensions are in millimeters, except for bolts and bolt holes.
  • 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.