Dimensions Orifice Weld Neck RTJ flanges ASME B16.36 – Class 600

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
1 125 36.6 81 R16 50.80 6.35 8.74 0.8 25.4 54 33.5 6.4 88.9 4 3/4 5/8 140
1.1/2 155 36.6 84 R20 68.27 6.35 8.74 0.8 25.4 70 48.3 6.4 114.3 4 7/8 3/4 140
2 165 36.6 84 R23 82.55 7.92 11.91 0.8 27.0 84 60.3 6.4 127.0 8 3/4 5/8 140
2.1/2 190 36.6 87 R26 101.60 7.92 11.91 0.8 27.0 100 73.0 6.4 149.2 8 7/8 3/4 145
3 210 36.6 87 R31 123.83 7.92 11.91 0.8 27.0 117 88.9 9.5 168.3 8 7/8 3/4 145
4 275 38.1 102 R37 149.23 7.92 11.91 0.8 27.0 152 114.3 12.7 215.9 8 1 7/8 165
6 355 47.7 117 R45 211.12 7.92 11.91 0.8 27.0 222 168.3 12.7 292.1 12 1.1/8 1 190
8 420 55.6 133 R49 269.88 7.92 11.91 0.8 27.0 273 219.1 12.7 349.2 12 1.1/4 1.1/8 210
10 510 63.5 152 R53 323.85 7.92 11.91 0.8 27.0 343 273.0 12.7 431.8 16 1.3/8 1.1/4 235
12 560 66.7 156 R57 381.00 7.92 11.91 0.8 27.0 400 323.8 12.7 489.0 20 1.3/8 1.1/4 240
14 605 69.9 165 R61 419.10 7.92 11.91 0.8 27.0 432 355.6 12.7 527.0 20 1.1/2 1.3/8 255
16 685 76.2 178 R65 469.90 7.92 11.91 0.8 30.2 495 406.4 12.7 603.2 20 1.5/8 1.1/2 275
18 745 82.6 184 R69 533.40 7.92 11.91 0.8 30.2 546 457.2 12.7 654.0 20 1.3/4 1.5/8 290
20 815 88.9 190 R73 584.20 9.53 13.49 1.5 31.8 610 508.0 12.7 723.9 24 1.3/4 1.5/8 320
24 940 101.6 203 R77 692.15 11.13 16.66 1.5 36.5 718 609.6 12.7 838.2 24 2 1.7/8 350
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.
  • Weld neck flanges NPS 3 and smaller are identical to Class 300 flanges except
    for bolting and may be used for such service.
  • All other dimensions are in accordance with ASME B16.5.
  • Ring joint flange in NPS 24 will require an angular meter tap.

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 10,
    19 mm (0.75 in.) for NPS 12 to NPS 18, and 22 mm (0.88 in.) for NPS 20.
  • 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.