Industrial AWWA Standard Flanges

The American Water Works Association was founded on March 29th 1881 by a group of men representing water utilities in Illinois, Indiana, Iowa, Kansas, Kentucky and Tennessee. They worked together to identify uniform requirements for waterworks systems. The original ANSI/AWWA C207 Steel pipe flange specification was officially adopted in 1955.

The AWWA C207 specification covers carbone steel ring type slip on Flanges and blind flanges.

General Information About AWWA Flanges

AWWA flanges are commonly used in waterworks, wastewater, slurry, plant piping or Other light duty applications generally requiring pressures of less than 300 psi. Pressure ratings for AWWA flanges range from the Class B flange rated at 86 psi to Class F flanges, both rated at 300 psi. Class D flanges are by far the most commonly specified among AWWA flange users, and carry a pressure rating of 175 psi for sizes below 12", and 150 psi for sizes 12" and larger.

The use of AWWA ring type steel flange has long been accepted for steel and concrete piping systems, and more recently with polyethylene piping, as a backup ring. When used with low pressure piping, AWWA flanges can frequently offer the user a cost savings over common forged flanges (typically ANSI B16.5 hub type flanges) which are generally designed for higher pressure applications such as oil, steam, chemical, etc.

Flange Material

The AWWA C207 specification does not require a specific grade of steel. Instead it establishes minimum physical and chemical properties as follows:

• Minimum Tensile : 50,000 psi
• Minimum Yield : 32,000 psi
• Elongation : 2" - 18%; 8" - 14"
• Maximum Carbon : .29%
• Maximum Phosphorus : .04 %
• Maximum Sulfur : .05 %

Frequently used materials might include: ASTM A-36 or ASTM A-283 plate steels or ASTM A181 or A105 forged steel meeting the requirements of AWWA C207.

Flange Facing

Flanges shall have a serrated finish of approximately 24 to 55 grooves per inch resulting in a 125-500 RMS surface finish. Serrations may be spiral or concentric. Other types of facings are also available upon request. AWWA flanges are normally supplied as flat faced, unless raised face is specified by customer.

Drilling Templates

Drilling templates are in multiples of four so that fittings may be made to face any quarter. Bolt holes straddle the center line. For flanges up to 84" holes are drilled 1/8 inch larger in diameter than the diameter of the bolt. For flanges larger than 84" holes are drilling 3/16" larger than the bolt diameter. Bolt holes may also be oversized by an additional 1/8" to accommodate insulators or to facilitate alignment.

Flange Marking

CAB flanges are customarily stamped with the trademark, nominal size, class, material designation and heat.

Flange Tolerances

• Inside Diameter : + 1/16" - 0
• Outside Diameter : +- 1/8"
• Thickness (18" and smaller) : + 1/8" -0
• Thickness (20" and larger) : +3/16" -0
• Bolt Circle Diameter : +- 1/16"
• Bolt Hole Spacing +- 1/32"

AWWA C207-13 Class D RING And BLIND FLANGESAWWA C207-13 Class D RING And BLIND FLANGES

Nominal size	Outside Diameter (OD)	Slip-on Bore (ID)	No. of Bolt Holes	Diameter Of Holes	Bolt Circle (BC)	Thickness (T)		Weight Each (lbs)
						Slip-on	Blind	Slip-on	Blind
4*	9.00	4.57	8	0.750	7.50	0.625	0.625	7.7	10.6
5*	10.00	5.66	8	0.875	8.50	0.625	0.650	8.6	13.6
6*	11.00	6.72	8	0.875	9.50	0.688	0.693	10.7	17.7
8*	13.50	8.72	8	0.875	11.75	0.688	0.812	15.3	31.8
10*	16.00	10.88	12	1.000	14.25	0.688	0.953	19.2	51.7
12*	19.00	12.88	12	1.000	17.00	0.812	1.117	33.1	86.7
14	21.00	14.19	12	1.125	18.75	0.938	1.133	46.8	107.4
16	23.50	16.19	16	1.125	21.25	1.000	1.265	60.1	149.8
18	25.00	18.19	16	1.250	22.75	1.062	1.331	63.7	177.7
20	27.50	20.19	20	1.250	25.00	1.125	1.448	79.5	233.6
22	29.50	22.19	20	1.375	27.25	1.188	1.568	89.9	290.5
24	32.00	24.19	20	1.375	29.50	1.250	1.661	111.6	364.5
26	34.25	26.25	24	1.375	31.75	1.312	1.786	128.1	448.2
28	36.50	28.25	28	1.375	34.00	1.312	1.906	140.6	542.6
30	38.75	30.25	28	1.375	36.00	1.375	2.008	163.3	647.3
32	41.75	32.25	28	1.625	38.50	1.500	2.150	210.0	798.6
34	43.75	34.25	32	1.625	40.50	1.500	2.252	219.1	916.9
36	46.00	36.25	32	1.625	42.75	1.625	2.370	259.4	1071.4
38	48.75	38.25	32	1.625	45.25	1.625	2.506	299.8	1278.2
40	50.75	40.25	36	1.625	47.25	1.625	2.609	311.1	1440.1
42	53.00	42.25	36	1.625	49.50	1.750	2.729	361.7	1648.1
44	55.25	44.25	40	1.625	51.75	1.750	2.849	385.1	1868.2
46	57.25	46.25	40	1.625	53.75	1.750	2.952	402.2	2083.7
48	59.50	48.25	44	1.625	56.00	1.875	3.072	457.3	2340.7
50	61.75	50.25	44	1.875	58.25	2.000	3.196	504.4	2601.9
52	64.00	52.25	44	1.875	60.50	2.000	3.315	539.1	2907.5
54	66.25	54.25	44	1.875	62.75	2.125	3.435	610.6	3236.7
60	73.00	60.25	52	1.875	69.25	2.250	3.779	759.1	4327.6
66	80.00	66.25	52	1.875	76.00	2.500	4.136	1017.0	5722.2
72	86.50	72.25	60	1.875	82.50	2.625	4.480	1198.2	7249.0
78	93.00	78.25	64	2.125	89.00	2.750	NA	1368.9	-
84	99.75	84.25	64	2.125	95.50	2.875	NA	1639.7	-
90	106.50	90.25	68	2.375	102.00	3.000	NA	1878.2	-
96	113.25	96.25	68	2.375	108.50	3.250	NA	2298.4	-
102	120.00	102.25	72	2.625	114.50	3.250	NA	2494.3	-
108	126.75	108.25	72	2.625	120.75	3.375	NA	2892.5	-
114	133.50	114.25	76	2.875	126.75	3.500	NA	3225.2	-
120	140.25	120.25	76	2.875	132.75	3.500	NA	3568.6	-
126	147.00	126.25	80	3.125	139.25	3.750	NA	4079.5	-
132	153.75	132.25	80	3.125	145.75	3.875	NA	4628.6	-
144	167.25	144.25	84	3.375	158.25	4.125	NA	5698.3	-

* 4" - 12" are rated 175 PSI; Larger sizes are rated 150 PSI. The purchaser shall specify the ID of the flange if other than standard as shown in table.

AWWA C207-13 Class E RING And BLIND FLANGES

Nominal size	Outside Diameter (OD)	Slip-on Bore (ID)	No. of Bolt Of Holes	Diameter of Holes	Bolt Circle (BC)	Thickness (T)		Weight Each (lbs)
						Slip-on	Blind	Slip-on	Blind
4	9.00	4.57	8	0.750	7.50	1.125	1.125	13.9	19.2
5	10.00	5.66	8	0.875	8.50	1.188	1.188	16.3	24.8
6	11.00	6.72	8	0.875	9.50	1.313	1.313	20.4	33.6
8	13.50	8.72	8	0.875	11.75	1.500	1.500	33.4	58.8
10	16.00	10.88	12	1.000	14.25	1.563	1.563	43.7	84.9
12	19.00	12.88	12	1.000	17.00	1.750	1.750	71.4	135.9
14	21.00	14.19	12	1.125	18.75	1.875	1.875	93.7	177.7
16	23.50	16.19	16	1.125	21.25	2.000	2.000	120.2	236.8
18	25.00	18.19	16	1.250	22.75	2.125	2.125	127.3	283.7
20	27.50	20.19	20	1.250	25.00	2.375	2.375	167.8	383.2
22	29.50	22.19	20	1.375	27.25	2.500	2.500	189.2	463.1
24	32.00	24.19	20	1.375	29.50	2.625	2.625	234.3	576.1
26	34.25	26.25	24	1.375	31.75	2.750	2.750	268.4	690.1
28	36.50	28.25	28	1.375	34.00	2.750	2.750	294.5	782.9
30	38.75	30.25	28	1.375	36.00	2.875	2.875	341.4	926.8
32	41.75	32.25	28	1.625	38.50	3.000	3.000	420.0	1114.3
34	43.75	34.25	32	1.625	40.50	3.000	3.050	438.3	1241.8
36	46.00	36.25	32	1.625	42.75	3.125	3.209	498.9	1450.7
38	48.75	38.25	32	1.625	45.25	3.125	3.394	576.5	1731.1
40	50.75	40.25	36	1.625	47.25	3.250	3.533	622.3	1950.2
42	53.00	42.25	36	1.625	49.50	3.375	3.695	697.6	2231.5
44	55.25	44.25	40	1.625	51.75	3.375	3.857	742.7	2529.4
46	57.25	46.25	40	1.625	53.75	3.438	3.997	790.2	2821.3
48	59.50	48.25	44	1.625	56.00	3.500	4.159	853.6	3169.0
50	61.75	50.25	44	1.875	58.25	3.500	4.327	882.7	3522.6
52	64.00	52.25	44	1.875	60.50	3.625	4.489	977.1	3937.1
54	66.25	54.25	44	1.875	62.75	3.750	4.651	1077.6	4382.5
60	73.00	60.25	52	1.875	69.25	3.875	5.116	1307.4	5858.7
66	80.00	66.25	52	1.875	76.00	4.250	5.601	1729.0	7749.0
72	86.50	72.25	60	1.875	82.50	4.375	6.066	1997.0	9815.3
78	93.00	78.25	64	2.125	89.00	4.750	NA	2364.5	-
84	99.75	84.25	64	2.125	95.50	4.750	NA	2709.1	-
90	106.50	90.25	68	2.375	102.00	5.125	NA	3208.8	-
96	113.25	96.25	68	2.375	108.50	5.125	NA	3624.3	-
102	120.00	102.25	72	2.625	114.50	5.500	NA	4221.1	-
108	126.75	108.25	72	2.625	120.75	5.500	NA	4713.8	-
114	133.50	114.25	76	2.875	126.75	5.875	NA	5413.8	-
120	140.25	120.25	76	2.875	132.75	5.875	NA	5990.1	-
126	147.00	126.25	80	3.125	139.25	6.250	NA	6799.2	-
132	153.75	132.25	80	3.125	145.75	6.250	NA	8062.8	-
144	167.25	144.25	84	3.375	158.25	6.750	NA	9324.4	-

AWWA C207-13 Class F RING And BLIND FLANGES

Nominal size	Outside Diameter (OD)	Slip-on Bore (ID)	No. of Bolt Holes	Diameter Of Holes	Bolt Circle (BC)	Thickness (T)		Weight Each (lbs)
						Slip-on	Blind	Slip-on	Blind
4	10.00	4.57	8	0.875	7.88	1.13	1.130	18.4	23.6
5	11.00	5.66	8	0.875	9.25	1.21	1.210	22.3	30.9
6	12.50	6.72	12	0.875	10.62	1.31	1.310	29.7	42.9
8	15.00	8.72	12	1.000	13.00	1.31	1.310	39.9	62.1
10	17.50	10.88	16	1.125	15.25	1.50	1.500	56.0	95.5
12	20.50	12.88	16	1.250	17.75	1.63	1.630	83.2	143.4
14	23.00	14.19	20	1.250	20.25	1.94	1.940	128.0	214.9
16	25.50	16.19	20	1.375	22.50	2.14	2.140	166.8	291.7
18	28.00	18.19	24	1.375	24.75	2.25	2.250	204.2	369.8
20	30.50	20.19	24	1.375	27.00	2.33	2.330	247.4	458.8
22	33.00	22.19	24	1.375	29.25	2.50	2.500	306.7	580.6
24	36.00	24.19	24	1.625	32.00	2.69	2.690	387.6	737.9
26	38.25	26.25	28	1.875	34.50	3.00	3.000	451.0	911.0
28	40.75	28.25	28	1.875	37.00	3.13	3.130	532.2	1088.0
30	43.00	30.25	28	1.875	39.25	3.15	3.166	585.7	1233.3
32	45.25	32.25	28	1.875	41.50	3.25	3.332	657.5	1445.2
34	47.50	34.25	28	1.875	43.50	3.38	3.475	740.7	1668.6
36	50.00	36.25	32	2.125	46.00	3.46	3.671	801.9	1924.2
38	52.25	38.25	32	2.125	48.00	3.50	3.815	874.3	2195.0
40	54.25	40.25	36	2.125	50.25	3.63	3.982	937.4	2463.8
42	57.00	42.25	36	2.125	52.75	3.81	4.171	1103.4	2864.7
44	59.25	44.25	36	2.125	55.00	4.00	4.338	1237.2	3231.9
46	61.50	46.25	40	2.125	57.25	4.13	4.505	1360.8	3628.7
48	65.00	48.25	40	2.125	60.75	4.50	4.781	1736.8	4322.1

The purchaser shall specify the ID of the flange if other than standard as shown in table.

AWWA C207-13 Class B RING And BLIND FLANGES

Nominal size	Outside Diameter (OD)	Slip-on Bore (ID)	No. of Bolt Holes	Diameter Of Holes	Bolt Circle (BC)	Thickness (T)		Weight Each (lbs)
						Slip-on	Blind	Slip-on	Blind
4	9.00	4.57	8	0.750	7.50	0.625	0.625	7.7	10.6
5	10.00	5.66	8	0.875	8.50	0.625	0.625	8.6	13.1
6	11.00	6.72	8	0.875	9.50	0.688	0.688	10.7	17.6
8	13.50	8.72	8	0.875	11.75	0.688	0.688	15.3	27.0
10	16.00	10.88	12	1.000	14.25	0.688	0.688	19.2	37.4
12	19.00	12.88	12	1.000	17.00	0.688	0.719	28.1	55.8
14	21.00	14.19	12	1.125	18.75	0.688	0.791	34.4	75.0
16	23.50	16.19	16	1.125	21.25	0.688	0.892	41.3	105.6
18	25.00	18.19	16	1.250	22.75	0.688	0.950	41.2	126.8
20	27.50	20.19	20	1.250	25.00	0.688	1.040	48.6	167.8
22	29.50	22.19	20	1.375	27.25	0.750	1.132	56.8	209.7
24	32.00	24.19	20	1.375	29.50	0.750	1.216	67.0	266.9
26	34.25	26.25	24	1.375	31.75	0.812	1.307	79.3	328.0
28	36.50	28.25	28	1.375	34.00	0.875	1.398	93.7	398.0
30	38.75	30.25	28	1.375	36.00	0.875	1.477	103.9	476.1
32	41.75	32.25	28	1.625	38.50	0.938	1.581	131.3	587.2
34	43.75	34.25	32	1.625	40.50	0.938	1.661	137.0	676.2
36	46.00	36.25	32	1.625	42.75	1.000	1.751	159.7	791.6
38	48.75	38.25	32	1.625	45.25	1.000	1.853	184.5	945.1
40	50.75	40.25	36	1.625	47.25	1.000	1.933	191.5	1067.0
42	53.00	42.25	36	1.625	49.50	1.125	2.023	232.5	1221.8
44	55.25	44.25	40	1.625	51.75	1.125	2.114	247.6	1386.3
46	57.25	46.25	40	1.625	53.75	1.125	2.194	258.6	1548.6
48	59.50	48.25	44	1.625	56.00	1.250	2.285	304.9	1741.1
50	61.75	50.25	44	1.875	58.25	1.250	2.377	315.2	1935.1
52	64.00	52.25	44	1.875	60.50	1.250	2.468	336.9	2164.6
54	66.25	54.25	44	1.875	62.75	1.375	2.559	395.1	2411.3
60	73.00	60.25	52	1.875	69.25	1.500	2.820	506.1	3229.4
66	80.00	66.25	52	1.875	76.00	1.625	3.092	661.1	4277.8
72	86.50	72.25	60	1.875	82.50	1.750	3.353	798.8	5425.4
78	93.00	78.25	64	2.125	89.00	2.000	NA	995.6	-
84	99.75	84.25	64	2.125	95.50	2.000	NA	1140.7	-
90	106.50	90.25	68	2.375	102.00	2.250	NA	1408.8	-
96	113.25	96.25	68	2.375	108.50	2.250	NA	1591.2	-
102	120.00	102.25	72	2.625	114.50	2.500	NA	1918.7	-
108	126.75	108.25	72	2.625	120.75	2.500	NA	2142.6	-
114	133.50	114.25	76	2.875	126.75	2.750	NA	2534.1	-
120	140.25	120.25	76	2.875	132.75	2.750	NA	2803.9	-
126	147.00	126.25	80	3.125	139.25	3.000	NA	3263.6	-
132	153.75	132.25	80	3.125	145.75	3.000	NA	3583.5	-
144	167.25	144.25	84	3.375	158.25	3.250	NA	4489.5	-

The purchaser shall specify the ID of the flange if other than standard as shown in table.

AWWA C207-13 Class D & E STEEL HUB FLANGES

Note: AWWA dropped hub flanges from the C207 sttandard in 2013. These dimensions are being provided for industry reference.

Nominal size	Outside Diameter (OD)	Slip-on Bore (ID)	No. of Bolt Holes	Diameter Of Holes	Bolt Circle (BC)	Flange Dimensions Class D			Flange Dimensions Class E
						T	L	E	T	L	E
4	9.00	4.57	8	0.750	7.50	0.500	0.875	5.312	0.938	1.312	5.312
5	10.00	5.66	8	0.875	8.50	0.562	1.250	6.312	0.938	1.438	6.438
6	11.00	6.72	8	0.875	9.50	0.562	1.250	7.562	1.000	1.562	7.562
8	13.50	8.72	8	0.875	11.75	0.562	1.250	9.688	1.125	1.750	9.688
10	16.00	10.88	12	1.000	14.25	0.688	1.250	12.000	1.188	1.938	12.000
12	19.00	12.88	12	1.000	17.00	0.688	1.250	14.375	1.250	2.188	14.375
14	21.00	14.19	12	1.125	18.75	0.750	1.250	15.750	1.375	2.250	15.750
16	23.50	16.19	16	1.125	21.25	0.750	1.250	18.000	1.438	2.500	18.000
18	25.00	18.19	16	1.250	22.75	0.750	1.250	19.875	1.562	2.688	19.875
20	27.50	20.19	20	1.250	25.00	0.750	1.250	22.000	1.688	2.875	22.000
22	29.50	22.19	20	1.375	27.25	1.000	1.750	24.250	1.812	3.125	24.000
24	32.00	24.19	20	1.375	29.50	1.000	1.750	26.125	1.875	3.250	26.125
26	34.25	26.25	24	1.375	31.75	1.000	1.750	28.500	2.000	3.375	28.500
28	36.50	28.25	28	1.375	34.00	1.000	1.750	30.500	2.062	3.438	30.750
30	38.75	30.25	28	1.375	36.00	1.000	1.750	32.500	2.125	3.500	32.750
32	41.75	32.25	28	1.625	38.50	1.125	1.750	34.750	2.250	3.625	35.000
34	43.75	34.25	32	1.625	40.50	1.125	1.750	36.750	2.312	3.688	37.000
36	46.00	36.25	32	1.625	42.75	1.125	1.750	38.750	2.375	3.750	39.250
38	48.75	38.25	32	1.625	45.25	1.125	1.750	40.750	2.375	3.750	41.750
40	50.75	40.25	36	1.625	47.25	1.125	1.750	43.000	2.500	3.875	43.750
42	53.00	42.25	36	1.625	49.50	1.250	1.750	45.000	2.625	4.000	46.000
44	55.25	44.25	40	1.625	51.75	1.250	2.250	47.000	2.625	4.000	48.000
46	57.25	46.25	40	1.625	53.75	1.250	2.250	49.000	2.688	4.062	50.000
48	59.50	48.25	44	1.625	56.00	1.375	2.500	51.000	2.750	4.125	52.250
50	61.75	50.25	44	1.875	58.25	1.375	2.500	53.000	2.750	4.125	54.250
52	64.00	52.25	44	1.875	60.50	1.375	2.500	55.000	2.875	4.250	56.500
54	66.25	54.25	44	1.875	62.75	1.375	2.500	57.000	3.000	4.375	58.750
60	73.00	60.25	52	1.875	69.25	1.500	2.750	63.000	3.125	4.500	65.250
66	80.00	66.25	52	1.875	76.00	1.500	2.750	69.000	3.375	4.875	71.500
72	86.50	72.25	60	1.875	82.50	1.500	2.750	75.000	3.500	5.000	78.500
78	93.00	78.25	64	2.125	89.00	1.750	3.000	81.250	3.875	5.375	84.500
84	99.75	84.25	64	2.125	95.50	1.750	3.000	87.500	3.875	5.375	90.500
90	106.50	90.25	68	2.375	102.00	2.000	3.250	93.750	4.250	5.750	96.750
96	113.25	96.25	68	2.375	108.50	2.000	3.250	100.000	4.250	5.750	102.750

Overboring of Flanges: Hub flanges are intended to be used on pipes having an OD equal to the nominal pipe size as shown in the first column of this table. Ring flanges (Class B, D, E, and F) may be overbored or counterbored to accommodate pipes having larger OD's.

AWWA C228-14 Stainless Steel Ring Flanges - Class SF

Nom Pipe Size	OD of Flange (A)	ID of Flange (B)		# of Bolts	Bolt Circle Dia (C)	Dia of Bolts	Thickness of Flange (T)
		Pipe	Tube
4	10.00	4.57	4.03	8.00	7.88	0.875	1.13
5	11.00	5.66	5.03	8.00	9.25	0.875	1.21
6	12.50	6.72	6.03	12.00	10.62	0.875	1.31
8	15.00	8.72	8.03	12.00	13.00	1.00	1.31
10	17.50	10.88	10.03	16.00	15.25	1.125	1.50
12	20.50	12.88	12.06	16.00	17.75	1.25	1.63
14	23.00	14.19	-	20.00	20.25	1.25	1.94
16	25.50	16.19	-	20.00	22.50	1.375	2.14
18	28.00	18.19	-	24.00	24.75	1.375	2.25
20	30.50	20.19	-	24.00	27.00	1.375	2.33
22	33.00	22.19	-	24.00	29.25	1.375	2.50
24	36.00	24.19	-	24.00	32.00	1.625	2.69
26	38.25	26.25	-	28.00	34.50	1.875	3.00
28	40.75	28.25	-	28.00	37.00	1.875	3.13
30	43.00	30.25	-	28.00	39.25	1.875	3.15
32	45.25	32.25	-	28.00	41.50	1.875	3.25
34	47.50	34.25	-	28.00	43.50	1.875	3.38
36	50.00	36.25	-	32.00	46.00	2.125	3.46
38	52.25	38.25	-	32.00	48.00	2.125	3.50
40	54.25	40.25	-	36.00	50.25	2.125	3.63
42	57.00	42.25	-	36.00	52.75	2.125	3.81
44	59.25	44.25	-	36.00	55.00	2.125	4.00
46	61.50	46.25	-	40.00	57.25	2.125	4.13
48	65.00	48.25	-	40.00	60.75	2.125	4.50

DIMENSIONS ARE IN INCHES
The purchaser shall specify the ID of the flange if other than standard as shown in table.

AWWA C228-14 Stainless steel Ring Flanges

Nom. Pipe Size	OD of Flange (A)	ID of Flange (B)		# of Bolts	Bolt Circle Dia	Dia of Bolts	Thickness of Flange
		Pipe	Tube				Class SA 50 psi	Class SB 86 psi	Class SD 150 psi	Class SE 275 psi
2	6.00	2.44	2.03	4	4.75	0.75	0.5	0.625	0.625	1.125
2.5	7.00	2.94	2.53	4	5.50	0.75	0.5	0.625	0.625	1.125
3	7.50	3.57	3.03	4	6.00	0.75	0.5	0.625	0.625	1.125
4	9.00	4.57	4.03	8	7.50	0.75	0.5	0.625	0.625	1.125
5	10.00	5.66	5.03	8	8.50	0.875	0.5	0.625	0.625	1.188
6	11.00	6.72	6.03	8	9.50	0.875	0.5	0.688	0.688	1.313
8	13.50	8.72	8.03	8	11.75	0.875	0.5	0.688	0.688	1.5
10	16.00	10.88	10.03	12	14.25	1	0.625	0.688	0.688	1.563
12	19.00	12.88	12.06	12	17.00	1	0.625	0.688	0.812	1.75
14	21.00	14.19	-	12	18.75	1.125	0.625	0.688	0.938	1.875
16	23.50	16.19	-	16	21.25	1.125	Use class SB	0.688	1	2
18	25.00	18.19	-	16	22.75	1.25	Use class SB	0.688	1.062	2.125
20	27.50	20.19	-	20	25.00	1.25	Use class SB	0.688	1.125	2.375
22	29.50	22.19	-	20	27.25	1.375	Use class SB	0.75	1.188	2.5
24	32.00	24.19	-	20	29.50	1.375	Use class SB	0.75	1.25	2.625
26	34.25	26.25	-	24	31.75	1.375	Use class SB	0.812	1.312	2.75
28	36.50	28.25	-	28	34.00	1.375	Use class SB	0.875	1.312	2.75
30	38.75	30.25	-	28	36.00	1.375	Use class SB	0.875	1.375	2.875
32	41.75	32.25	-	28	38.50	1.625	Use class SB	0.938	1.5	3
34	43.75	34.25	-	32	40.50	1.625	Use class SB	0.938	1.5	3
36	46.00	36.25	-	32	42.75	1.625	Use class SB	1	1.625	3.125
38	48.75	38.25	-	32	45.25	1.625	Use class SB	1	1.625	3.125
40	50.75	40.25	-	36	47.25	1.625	Use class SB	1	1.625	3.25
42	53.00	42.25	-	36	49.50	1.625	Use class SB	1.125	1.75	3.375
44	55.25	44.25	-	40	51.75	1.625	Use class SB	1.125	1.75	3.375
46	57.25	46.25	-	40	53.75	1.625	Use class SB	1.125	1.75	3.438
48	59.50	48.25	-	44	56.00	1.625	Use class SB	1.25	1.875	3.5
50	61.75	50.25	-	44	58.25	1.875	Use class SB	1.25	2	3.5
52	64.00	52.25	-	44	60.50	1.875	Use class SB	1.25	2	3.625
54	66.25	54.25	-	44	62.75	1.875	Use class SB	1.375	2.125	3.75
60	73.00	60.25	-	52	69.25	1.875	Use class SB	1.5	2.25	3.875
66	80.00	66.25	-	52	76.00	1.875	Use class SB	1.625	2.5	4.25
72	86.50	72.25	-	60	82.50	1.875	Use class SB	1.75	2.625	4.375

DIMENSIONS ARE IN INCHES
The purchser shall specify the ID of the flange if other than standard as shown in table.

AWWA C228-14 Stainless Steel Blind Flanges

CLASSES SA, SB, SD, SE, SF

Nom Pipe Size	Class SA 50 psi	Class SB 86 psi	Class SD 150 psi	Class SE 275 psi	Class SF 300 psi
2	0.50	NA	NA	NA	NA
2.5	0.50	NA	NA	NA	NA
3	0.50	NA	NA	NA	NA
4	0.50	0.625	0.625	1.125	1.13
5	0.50	0.625	0.65	1.188	1.21
6	0.50	0.688	0.693	1.313	1.31
8	0.50	0.688	0.8125	1.5	1.31
10	Use class SB	0.688	0.953	1.563	1.5
12	Use class SB	0.719	1.117	1.75	1.63
14	Use class SB	0.791	1.133	1.875	1.94
16	Use class SB	0.892	1.265	2	2.14
18	Use class SB	0.95	1.331	2.125	2.25
20	Use class SB	1.04	1.148	2.375	2.33
22	Use class SB	1.132	1.568	2.5	2.5
24	Use class SB	1.216	1.661	2.625	2.69
26	Use class SB	1.307	1.786	2.75	3
28	Use class SB	1.398	1.906	2.75	3.13
30	Use class SB	1.477	2.008	2.875	3.166
32	Use class SB	1.581	2.15	3	3.332
34	Use class SB	1.661	2.252	3.05	3.475
36	Use class SB	1.751	2.37	3.209	3.671
38	Use class SB	1.853	2.506	3.394	3.815
40	Use class SB	1.933	2.609	3.533	3.982
42	Use class SB	2.023	2.729	3.695	4.171
44	Use class SB	2.114	2.849	3.857	4.338
46	Use class SB	2.194	2.952	3.997	4.505
48	Use class SB	2.285	3.072	4.159	4.781
50	Use class SB	2.377	3.196	4.327	-
52	Use class SB	2.468	3.315	4.489	-
54	Use class SB	2.559	3.435	4.651	-
60	Use class SB	2.82	1.779	5.116	-
66	Use class SB	3.092	4.136	5.601	-

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