ASME B16.47: Large Diameter Steel Flanges

ASME B16.47 Standard covers pressure–temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60.

For smaller sizes flange dimensioins, please refer to ASME B16.5

ASME B16.47 Flange Dimensions

Series A

RF Flanged Ends

ASME B16.47 Series A RF flanged dimensions

Class 150

NPS	D	D1	D2	C	f	n-Φ
26	870	806.4	749	66.7	2	24-35
28	925	863.6	800	69.9	2	28-35
30	985	914.4	857	73.1	2	28-35
32	1060	977.9	914	79.4	2	28-41
34	1110	1028.7	965	81.0	2	32-41
36	1170	1085.8	1022	88.9	2	32-41
38	1240	1149.4	1073	85.8	2	32-41
40	1290	1200.2	1124	88.9	2	36-41
42	1345	1257.3	1194	95.3	2	34-41
44	1405	1314.4	1245	100.1	2	40-41
46	1455	1365.2	1295	101.6	2	40-41
48	1510	1422.4	1359	106.4	2	44-41
50	1570	1479.6	1410	109.6	2	44-48
52	1625	1536.7	1461	114.3	2	44-48
54	1685	1593.8	1511	119.1	2	44-48
56	1745	1651	1575	122.3	2	48-48
58	1805	1708.2	1626	127.0	2	48-48
60	1855	1759	1676	130.2	2	52-48

Class 300

NPS	D	D1	D2	C	f	n-Φ
26	970	876.3	749	77.8	2	28-44.5
28	1035	939.8	800	84.2	2	28-44.5
30	1090	997	857	90.5	2	28-48
32	1150	1054.1	914	96.9	2	28-51
34	1205	1104.9	965	100.1	2	28-51
36	1270	1168.4	1022	103.2	2	32-54
38	1170	1092.2	1029	106.4	2	32-41
40	1240	1155.7	1086	112.8	2	32-44.5
42	1290	1206.5	1137	117.5	2	32-44.5
44	1355	1263.6	1194	122.3	2	32-48
46	1415	1320.8	1245	127	2	28-51
48	1465	1371.6	1302	131.8	2	32-51
50	1530	1428.8	1359	138.2	2	32-54
52	1580	1479.6	1410	142.9	2	32-54
54	1660	1549.4	1467	150.9	2	28-60
56	1710	1600.2	1518	152.4	2	28-60
58	1760	1651	1575	157.2	2	32-60
60	1810	1701.8	1626	162	2	32-60

Class 600

NPS	D	D1	D2	C	f	n-Φ
26	1015	914.4	749	108	7	28-51
28	1075	965.2	800	111.2	7	28-54
30	1130	1022.4	857	114.3	7	28-54
32	1195	1079.5	914	117.5	7	28-60
34	1245	1130.3	965	120.7	7	28-60
36	1315	1193.8	1022	123.9	7	28-67
38	1270	1162	1054	152.4	7	28-60
40	1320	1212.8	1111	158.8	7	32-60
42	1405	1282.7	1168	168.3	7	28-67
44	1455	133.5	1226	173.1	7	32-67
46	1510	1390.6	1276	179.4	7	32-67
48	1595	1460.5	1334	189	7	32-73
50	1670	1524	1384	196.9	7	28-79
52	1720	1574.8	1435	203.2	7	32-79
54	1780	1632	1492	209.6	7	32-79
56	1855	1695.4	1543	217.5	7	32-86
58	1905	1746.2	1600	222.3	7	32-86
60	1995	1822.4	1657	233.4	7	28-92

Class 900

NPS	D	D1	D2	C	f	n-Φ
26	1085	952.5	749	139.7	7	20-73
28	1170	1022.4	800	142.9	7	20-79
30	1230	1085.8	857	149.3	7	20-79
32	1315	1155.7	914	158.8	7	20-86
34	1395	1225.	965	165.1	7	20-92
36	1460	1289	1022	171.5	7	20-92
38	1460	1289	1099	190.5	7	20-92
40	1510	1339.8	1162	196.9	7	24-92
42	1560	1390.6	1213	206.4	7	24-92
44	1650	1463.7	1270	214.4	7	24-98.5
46	1735	1536.7	1334	225.5	7	24-105
48	1785	1587.5	1384	233.4	7	24-105

RTJ Flanged Ends

ASME B16.47 Series A RTJ flanged dimensions

Class 300

NPS	D	D1	D2	D3	C	f	E	n-Φ	R
26	970	876.3	810	749.3	77.8	19.84	12.7	28-44.5	1.5
28	1035	939.8	861	800.1	84.2	19.84	12.7	28-44.5	1.5
30	1090	997	917	857.25	90.5	19.84	12.7	28-48	1.5
32	1150	1054.1	984	914.4	96.9	23.01	14.27	28-51	1.5
34	1205	1104.9	1035	965.2	100.1	23.01	14.27	28-51	1.5
36	1270	1168.4	1092	1022.35	103.2	23.01	14.27	32-54	1.5

Class 600

NPS	D	D1	D2	D3	C	f	E	n-Φ	R
26	1015	914.4	810	749.3	108	19.84	12.7	28-51	1.5
28	1075	965.2	861	800.1	111.2	19.84	12.7	28-54	1.5
30	1130	1022.4	917	857.25	114.3	19.84	12.7	28-54	1.5
32	1195	1079.5	984	914.4	117.5	23.01	14.27	28-60	1.5
34	1245	1130.3	1035	965.2	120.7	23.01	14.27	28-60	1.5
36	1315	1193.8	1092	1022.35	123.9	23.01	14.27	28-67	1.5

Class 900

NPS	D	D1	D2	D3	C	f	E	n-Φ	R
26	1085	952.5	832	749.3	139.7	30.18	17.48	20-73	2.3
28	1170	1022.4	889	800.1	142.9	33.32	17.48	20-79	2.3
30	1230	1085.8	946	857.25	149.3	33.32	17.48	20-79	2.3
32	1315	1155.7	1003	914.4	158.8	33.32	17.48	20-86	2.3
34	1395	1225.6	1067	965.2	165.1	36.53	20.62	20-92	2.3
36	1460	1289	1124	1022.35	171.5	36.53	20.62	20-92	2.3

SERIES B

ASME B16.47 Series B flange dimensions

Class 150

NPS	D	D1	D2	C	f	n-Φ
26	785	744.5	711	39.8	2	36-22
28	835	795.3	762	43	2	40-22
30	885	846.1	813	43	2	44-22
32	940	900.1	864	44.6	2	48-22
34	1005	957.3	921	47.7	2	40-25.5
36	1055	1009.6	972	50.9	2	44-25.5
38	1125	1070	1022	52.5	2	40-29
40	1175	1120.8	1080	54.1	2	44-29
42	1225	1171.6	1130	57.3	2	48-29
44	1275	122.4	1181	58.9	2	52-29
46	1340	1284.3	1235	60.4	2	40-32
48	1390	1335.1	1289	63.6	2	44-32
50	1445	1385.9	1340	66.8	2	48-32
52	1495	1436.7	1391	68.4	2	52-32
54	1550	1492.2	1441	70	2	56-32
56	1600	1543	1492	71.6	2	60-32
58	1675	1611.3	1543	73.1	2	48-35
60	1725	1662.1	1600	74.7	2	52-35

Class 300

NPS	D	D1	D2	C	f	n-Φ
26	865	803.3	737	87.4	2	32-35
28	920	857.2	787	87.4	2	36-35
30	990	920.8	845	92.1	2	36-38
32	1055	977.9	902	101.6	2	32-41
34	1110	1031.9	953	101.6	2	36-41
36	1170	1089	1010	101.6	2	32-44.5
38	1220	1139.8	1060	109.6	2	36-44.5
40	1275	1190.6	1114	114.3	2	40-44.5
42	1335	1244.6	1168	117.5	2	36-48
44	1385	1295.4	1219	125.5	2	40-48
46	1460	1365.2	1270	127	2	36-51
48	1510	1416	1327	127	2	40-51
50	1560	1466.8	1378	136.6	2	44-51
52	1615	1517.6	1429	141.3	2	48-51
54	1675	1578	1480	135	2	48-51
56	1765	1651	1537	152.4	2	36-60
58	1825	1912.9	1594	152.4	2	40-60
60	1880	1763.7	1651	149.3	2	40-60

Class 600

NPS	D	D1	D2	C	f	n-Φ
26	890	806.4	727	111.2	7	28-44.5
28	950	863.6	784	115.9	7	28-48
30	1020	927.1	841	125.5	7	28-51
32	1085	984.2	895	130.2	7	28-54
34	1160	1054.1	953	141.3	7	24-60
36	1215	1104.9	1010	146.1	7	28-60

Class 900

NPS	D	D1	D2	C	f	n-Φ
26	1020	901.7	762	135	7	20-67
28	1105	971.6	819	147.7	7	20-73
30	1180	1035	876	155.6	7	20-79
32	1240	1092.2	927	160.4	7	20-79
34	1315	1155.7	991	171.5	7	20-86
36	1345	1200.2	1029	173.1	7	24-79

ASME B16.47 Standard covers pressure–temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U.S. Customary units, with diameter of bolts and flange bolt holes expressed in inch units.

This Standard is limited to

(a) flanges made from cast or forged materials

(b) blind flanges made from cast, forged, or plate mate- rials (see Tables 1 and 2)

Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.

1.2 Flange Series

ASME B16.47 Standard provides two series of flange dimensions.

Series A specifies flange dimensions for general use flanges.

Series B specifies flange dimensions for compact flanges that, in most cases, have smaller bolt circle diameters than Series A flanges. These two series of flanges are, in general, not interchangeable.

The user should recognize that some flanged valves, equipment bolted between flanges, and flanged equip-ment may be compatible with only one series of these flanges.