Capacities | Metering Orifice
ORIFICE BORE DIAMETER OF 8694A METERING ORIFICES
T ABLE B2. Orifice ID, inches (mm)
Gas Pipe Size Code, 8694A-
Plate No.*
-01
-0
-1
-2
-3
-4
-5
-6
( 1/2 ")
( 3/4 ")
(1 1/4 ")
(1 1/2 ")
(2 1/2 ")
(1")
(2")
(3")
90 108 130 156 186 225 270 324 387 468 558 675
0.383 (9.73) 0.419 (10.64) 0.455 (11.56) 0.496 (12.60) 0.539 (13.69) 0.586 (14.88)
0.503(12.78) 0.547 (13.89)
0.6 (15.24)
0.604(15.34)
810
0.634 (16.10 0.658 (16.71)‡
0.651 (16.54)
0.66(16.76)
915‡ 972 1160
0.707 (17.96) 0.769 (19.53)
0.718(18.24) 0.781(1984)
0.722(18.34) 0.790(20.07)
1400 1670 1890 ‡ 2000 2400 2880 2970‡ 3450 4150 4810‡ 4970 6000 7200 7286‡ 8640 10350 11950‡ 12450 15700‡
0.833 (21.16)
0.85(21.59) 0.918(23.32)
0.862(21.90) 0.940(23.88)
0.937 (23.80)‡
0.989 25.12)
1.02(25.91)
1.110(28.19) 1.204(30.58)
1.156(29.36)‡
1.475 (37.47)‡
Note: See Bulletin 8697 for unavailable sizes
‡ High Beta ratio; normally used for air to prove flow only .*00 is a blank plate without orifice
Bulletin 8694A Page 4
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