Dimensions Orifice Weld Neck RTJ flanges ASME B16.36 – Class 1500

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
1 150 38.1 83 R16 50.80 6.35 8.74 0.8 25.4 52 33.5 6.4 101.6 4 1 7/8 160
1.1/2 180 38.1 89 R20 68.27 6.35 8.74 0.8 25.4 70 48.3 6.4 123.8 4 1.1/8 1 165
2 215 38.1 102 R24 95.25 7.92 11.91 0.8 27.0 105 60.3 6.4 165.1 8 1 7/8 165
2.1/2 245 41.3 105 R27 107.95 7.92 11.91 0.8 27.0 124 73.0 6.4 190.5 8 1.1/8 1 180
3 265 47.7 117 R35 136.53 7.92 11.91 0.8 27.0 133 88.9 9.5 203.2 8 1.1/4 1.1/8 185
4 310 54.0 124 R39 161.93 7.92 11.91 0.8 27.0 162 114.3 12.7 241.3 8 1.3/8 1.1/4 215
6 395 82.6 171 R46 211.14 9.52 13.49 1.5 28.6 229 168.3 12.7 317.5 12 1.1/2 1.3/8 280
8 485 92.1 213 R50 269.88 11.13 16.66 1.5 33.3 292 219.1 12.7 393.7 12 1.3/4 1.5/8 310
10 585 108.0 254 R54 323.85 11.13 16.66 1.5 33.3 368 273.0 12.7 482.6 12 2 1.7/8 355
12 675 123.9 283 R58 381.00 14.27 23.01 1.5 39.7 451 323.8 12.7 571.6 16 2.1/8 2 400
14 750 133.4 298 R63 419.10 15.88 26.97 2.4 44.4 495 355.6 12.7 635.0 16 2 3/8 2.1/4 445
16 825 146.1 311 R67 469.90 17.48 30.18 2.4 50.8 552 406.4 12.7 704.8 16 2 5/8 2.1/2 485
18 915 162.0 327 R71 533.40 17.48 30.18 2.4 50.8 597 457.2 12.7 774.7 16 2 7/8 2.3/4 535
20 985 177.8 356 R75 584.20 17.48 33.32 2.4 54.0 641 508.0 12.7 831.8 16 3.1/8 3 570
24 1170 203.2 406 R79 692.15 20.62 36.53 2.4 58.7 762 609.6 12.7 990.6 16 3.5/8 3.1/2 660
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 6 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 and 10 mm (0.38 in.) for NPS 14 to NPS 24.
    Bolt lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 6.
  • 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.