American Flange Standards
ASME Ring Grooves B16 specifications cover ring joint dimensions for Series A Class 300, 600, and 900 flanges, primarily for large diameter pipes from 650mm (26") to 900mm (36").
| Ring Joint Dimensions Series.A CLASS 300,600,900 | ||||||||
|---|---|---|---|---|---|---|---|---|
| NOMINAL PIPE SIZE CLASS 300 600 900 | GROOVE NUMBER | PITCH DIAMETER | DEPTH | WIDTH | RADIUS AT BASE | DIAMETER RF SECTION | ||
| 650 (26") | 650 (26") | R93 | 749.3 | 13 | 20 | 1.5 | 810 | |
| 700 (28") | 700 (28") | R94 | 800.1 | 13 | 20 | 1.5 | 861 | |
| 750 (30") | 750 (30") | R95 | 857.25 | 13 | 20 | 1.5 | 917 | |
| 800 (32") | 800 (32") | R96 | 914.4 | 14 | 23 | 1.5 | 984 | |
| 850 (34") | 850 (34") | R97 | 965.2 | 14 | 23 | 1.5 | 1035 | |
| 900 (36") | 900 (36") | R98 | 1022.35 | 14 | 23 | 1.5 | 1092 | |
| 650 (26") | R100 | 749.3 | 17 | 30 | 2.3 | 832 | ||
| 700 (28") | R101 | 800.1 | 17 | 33 | 2.3 | 889 | ||
| 750 (30") | R102 | 857.25 | 17 | 33 | 2.3 | 946 | ||
| 800 (32") | R103 | 914.4 | 17 | 33 | 2.3 | 1003 | ||
| 850 (34") | R104 | 965.2 | 21 | 37 | 2.3 | 1067 | ||
| 900 (36") | R105 | 1022.35 | 21 | 37 | 2.3 | 1124 |
NOTES:
(1) Ring-joint gaskets are not contemplated for sizes 950 (38") and larger flanges.
(2) Height of raised portion is equal to the depth of groove B, but is not subject to the tolerance for B full face contour.
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