AWWA C207 Class D Ring Flange

Technical Drawing

The AWWA C207 Class D steel ring flanges are available in sizes 4″ through 144″. These flanges have the same OD and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150 drilling for steel flanges. The maximum pressure (test or transient) allowed can be up to 262.5 psi for 4″~12″ Class D slip-on ring flanges, and 225 psi for sizes larger than 12″ slip-on ring flanges.

Dimensions & Masses

NPS	A	B	T
4"	9.00	4.57	0.625
5"	10.00	5.66	0.625
6"	11.00	6.72	0.688
8"	13.50	8.72	0.688
10"	16.00	10.88	0.688
12"	19.00	12.88	0.812
14"	21.00	14.19	0.938
16"	23.50	16.19	1.000
18"	25.00	18.19	1.062
20"	27.50	20.19	1.125
22"	29.50	22.19	1.188
24"	32.00	24.19	1.250
26"	34.25	26.19	1.312
28"	36.50	28.19	1.312
30"	38.75	30.19	1.375
32"	41.75	32.19	1.500
34"	43.75	34.19	1.500
36"	46.00	36.19	1.625
38"	48.75	38.19	1.625
40"	50.75	40.19	1.625
42"	53.00	42.19	1.750
44"	55.25	44.19	1.750
46"	57.25	46.19	1.750
48"	59.50	48.19	1.875
50"	61.75	50.19	2.000
52"	64.00	52.19	2.000
54"	66.25	54.19	2.125
60"	73.00	60.19	2.250
66"	80.00	66.19	2.500
72"	86.50	72.19	2.625
78"	93.00	78.19	2.750
84"	99.75	84.19	2.875
90"	106.50	90.19	3.000
96"	113.25	96.19	3.250
102"	120.00	102.19	3.250
108"	126.75	108.19	3.375
114"	133.50	114.19	3.500
120"	140.25	120.19	3.500
126"	147.00	126.19	3.750
132"	153.75	132.19	3.875
144"	167.25	144.19	4.125

*A: OD of flange; B: ID of flange; T: thickness of flange; All dimensions are in inch unit.
*The purchaser shall specify the ID of the flange, dimension B, for NPS 26″ and larger. The diameter of the flange bore shall not exceed the pipe OD by more than 0.25″.
*Dimensions of AWWA C207 Class D ring flange are the same as that of Class B ring flange except for the thickness of flange, T.

NPS	n	C	d
4"	8	7.50	0.625
5"	8	8.50	0.750
6"	8	9.50	0.750
8"	8	11.75	0.750
10"	12	14.25	0.875
12"	12	17.00	0.875
14"	12	18.75	1.000
16"	16	21.25	1.000
18"	16	22.75	1.125
20"	20	25.00	1.125
22"	20	27.25	1.250
24"	20	29.50	1.250
26"	24	31.75	1.250
28"	28	34.00	1.250
30"	28	36.00	1.250
32"	28	38.50	1.500
34"	32	40.50	1.500
36"	32	42.75	1.500
38"	32	45.25	1.500
40"	36	47.25	1.500
42"	36	49.50	1.500
44"	40	51.75	1.500
46"	40	53.75	1.500
48"	44	56.00	1.500
50"	44	58.25	1.750
52"	44	60.50	1.750
54"	44	62.75	1.750
60"	52	69.25	1.750
66"	52	76.00	1.750
72"	60	82.50	1.750
78"	64	89.00	2.000
84"	64	95.50	2.000
90"	68	102.00	2.250
96"	68	108.50	2.250
102"	72	114.50	2.500
108"	72	120.75	2.500
114"	76	126.75	2.750
120"	76	132.75	2.750
126"	80	139.25	3.000
132"	80	145.75	3.000
144"	84	158.25	3.250

*n: number of bolts; C: diameter of bolt circle; d: diameter of bolts; All dimensions are in inch unit.
*For flanges up to NPS 84″, bolt holes shall be drilled 1/8″ [3.2 mm] larger in diameter than the nominal diameter of the bolt. For flanges larger than 84″, bolt holes shall be drilled 3/16″ [4.8 mm] larger than the nominal bolt diameter.

NPS	Mass
4"	3.51
5"	3.90
6"	4.85
8"	6.96
10"	8.73
12"	15.02
14"	21.27
16"	27.27
18"	28.88
20"	36.07
22"	40.81
24"	50.65
26"	58.56
28"	64.24
30"	74.63
32"	95.92
34"	100.11
36"	118.50
38"	136.86
40"	142.06
42"	165.13
44"	175.78
46"	183.60
48"	208.72
50"	230.22
52"	246.02
54"	278.63
60"	346.29
66"	463.76
72"	546.31
78"	624.12
84"	747.41
90"	849.88
96"	1040.57
102"	1128.61
108"	1309.54
114"	1459.40
120"	1615.53
126"	1845.96
132"	2095.33
144"	2579.41

*The unit of mass: kg.

AWWA C207 Pipe Flange Dimensions & Masses
Ring Flange	Class B | Class D Class E | Class F
Blind Flange	Class B | Class D Class E | Class F
Hub Flange	Class D | Class E

*Click to view more information about AWWA C207 steel flanges.