ASME B16.47 Series B Flanges Archives | Quality Manufacturer of Industrial Pipe Fittings

ASME B16.47 Series B Flanges

zhao77jie — Thu, 11 Sep 2025 02:00:00 +0000

In August 2025, one of our long-standing domestic clients placed another order for a batch of ASME B16.47 Series B Flanges. The specific product and material were 316L weld weld flanges.This marks not just another purchase but a continued chapter in our enduring partnership.

Upon order confirmation, we immediately initiated raw material inspections, dimensional checks, and pressure testing. We also processed the flanges according to the client’s specific packaging requirements to ensure safe and undamaged transport. Simultaneously, we provided the customer with a Material Test Certificate (MTC), ensuring every product detail is fully documented and traceable.

For us, each order represents more than just a transaction—it embodies the trust and recognition our customers place in us. We remain committed to delivering reliable pipe fittings and flange solutions to global clients with professionalism and responsibility.

For more information about ASME B16.47 Series B flanges, please click

To learn more about ASME B16.47 Series A flanges, please click

Weld Neck Flange Inspection

Outside Diameter Inspection

Use a caliper or specialized measuring tool to measure the flange’s outside diameter to ensure it complies with standards (such as ASME, EN, and DIN). The accuracy of the outside diameter directly impacts the fit of the flange with the pipe and fittings.

Thickness Measurement

The flange’s wall thickness determines its pressure-bearing capacity. Typically, an ultrasonic thickness gauge or vernier caliper is used to ensure the thickness meets the design pressure rating.

Bolt Hole Inspection

Check that the bolt hole diameters meet standards to avoid deviations during assembly.

Measure the center circle diameter (PCD) of the bolt holes to ensure they match the corresponding flange or equipment flange.

Verify the number and even distribution of bolt holes to avoid installation difficulties or seal failure due to asymmetry.

Surface Inspection

Check that the sealing surface is flat and smooth, free of cracks, scratches, or rust, to ensure proper sealing performance.

Material & Marking Inspection

Spectroscopic analysis or MTC (Material Certificate) verification confirms that the flange material meets customer and standard requirements. We also verify the integrity of flange surface markings, including specifications, pressure rating, material, and standard number.

ASTM A182 F316L Weld Neck Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F316	MIN						10.0	16.0	2.00
ASTM A182 F316	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00	0.10
ASTM A182 F316L	MIN						10.00	16.0	2.00
ASTM A182 F316L	MAX	0.03	2.00	0.045	0.030	1.00	15.00	18.0	3.00	0.10

ASTM A182 F316L Weld Neck Flange Mechanical Property

MATERIAL	ASTM A182 F316	ASTM A182 F316L
T.S (MPA)	515 min	485 min
Y.S (MPA)	205 min	170 min
EL %	30 min	30 min
R/A %	50 min	50 min

ASME B16.47 Series B Class 150 Flange Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	785.88	41.15	44.45	88.90	661.92	684.28	711.20	36	22.35	744.47	9.65
28	836.68	44.45	47.75	95.25	712.72	735.08	762.00	40	22.35	795.27	9.65
30	887.48	44.45	50.80	100.08	763.52	787.40	812.80	44	22.35	846.07	9.65
32	941.32	45.97	53.85	107.95	814.32	839.72	863.60	48	22.35	900.18	9.65
34	39.56 1004.8	49.28	57.15	110.24	865.12	892.05	920.75	40	25.40	957.33	9.65
36	1057.1	52.32	58.67	117.35	915.92	944.63	971.55	44	25.40	1009.7	9.65
38	1124.0	53.85	63.50	123.95	968.25	996.95	1022.4	40	28.45	1069.8	9.65
40	1174.8	55.63	66.55	128.52	1019.0	1049.3	1079.5	44	28.45	1120.6	9.65
42	1225.6	58.67	68.33	133.35	1069.8	1101.9	1130.3	48	28.45	1171.4	11.18
44	1276.4	60.45	71.37	136.65	1120.6	1152.7	1181.1	52	28.45	1222.2	11.18
46	1341.4	61.98	74.68	144.53	1171.4	1205.0	1234.9	40	31.75	1284.2	11.18
48	1392.2	65.02	77.72	149.35	1222.2	1257.3	1289.1	44	31.75	1335.0	11.18

ASME B16.47 Standard

This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included here 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 materials, Also, included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.

Material & Grades of ASME B16.47 Flanges

Carbon Steel Threaded Flanges :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel Threaded / Screwed Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Threaded Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Threaded Flanges :
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61

Copper Alloy Steel Threaded Flanges :

ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Threaded Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

Applications

Oil & Gas pipelines

Petrochemical plants

Water treatment and desalination projects

Power generation systems

Structural and general industrial piping

Advantages of Using Series B Flanges

Cost-effective for large diameter pipelines

Easy availability in multiple materials and sizes

Reliable sealing with fewer bolts

Reduced overall piping system weight

Why Choose ZIZI for ASME B16.47 Series B Flanges?

At ZIZI Engineering, we manufacture and supply a wide range of ASME B16.47 Series B weld neck and blind flanges. Our products are produced according to ASME, ASTM, and ANSI standards, ensuring durability and performance.

Quality Assurance: 100% inspection before delivery
Wide Material Range: Carbon steel, stainless steel, alloy steel, duplex
Global Supply: Fast delivery with strong export packaging
Customization: Available upon client request

The post ASME B16.47 Series B Flanges appeared first on Quality Manufacturer of Industrial Pipe Fittings.

ASME B16.47 Series B Flanges

zhao77jie — Thu, 21 Aug 2025 02:00:00 +0000

ASME B16.47 Series B Flanges are large-diameter steel flanges specifically designed for high-pressure, high-temperature piping systems. They are part of the ASME B16.47 standard, which covers butt-weld flanges and blind flanges in sizes ranging from NPS 26 to NPS 60. ASME B16.47 is a standard established by the American Society of Mechanical Engineers (ASME) specifically for defining the dimensions and pressure ratings of large-diameter steel flanges ranging from NPS 26“ to NPS 60”. This standard succeeded two separate standards: MSS SP-44 (Series A) and API 605 ( Series B).

ASME B16.47 Series B flanges, as the successor to API 605, are renowned for their unique structural design. Compared to Series A flanges, Series B flanges are typically thinner, lighter, and use more but smaller bolts. This design offers advantages in terms of installation and transportation, making them particularly suitable for projects with strict requirements for weight and cost. Contact us

ASME B16.47 Standard

Scope

(a) flanges made from cast or forged materials

(b) blind flanges made from cast, forged, or plate materials (see Tables 1 and 2)Also, included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.

Flange Series

This Standard provides two series of flange dimensions. Series A specifies flange dimensions for general use flanges. Series Bspecifies flange dimensions for com-pact 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 equipment may be compatible with only one series of these flanges.

Material & Grades of ASME B16.47 Series A Flanges

Carbon Steel Flanges :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Flanges :
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61

Copper Alloy Steel Flanges :

ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

ASME B16.47 Series B Class 75 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	762	33.27	33.27	58.67	661.92	676.15	704.85	36	19.05	723.9	7.87
28	812.8	33.27	33.27	61.98	712.72	726.95	755.65	40	19.05	774.70	7.87
30	863.6	33.27	33.27	65.02	763.52	777.75	806.45	44	19.05	825.50	7.87
32	914.4	35.05	36.58	69.85	814.32	828.55	857.25	48	19.05	876.30	7.87
34	965.2	35.05	38.10	73.15	865.12	879.35	908.05	52	19.05	927.10	7.87
36	1033.5	36.58	42.42	85.85	915.92	934.97	965.20	40	22.35	992.12	9.65
38	1084.3	38.10	44.45	88.90	966.72	985.77	1016.0	40	22.35	1042.9	9.65
40	1135.1	38.10	44.45	91.95	1017.5	1036.57	1066.8	44	22.35	1093.7	9.65
42	1185.9	39.62	47.75	95.25	1068.3	1087.37	1117.6	48	22.35	1144.5	9.65
44	1251.0	42.93	49.28	104.65	1119.1	1139.95	1174.8	36	25.40	1203.5	9.65
46	1301.8	44.45	50.80	107.95	1169.9	1190.75	1225.6	40	25.40	1254.3	9.65
48	1352.6	45.97	53.85	111.25	1220.7	1241.55	1276.4	44	25.40	1305. 1	9.65

ASME B16.47 Series B Class 150 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	785.88	41.15	44.45	88.90	661.92	684.28	711.20	36	22.35	744.47	9.65
28	836.68	44.45	47.75	95.25	712.72	735.08	762.00	40	22.35	795.27	9.65
30	887.48	44.45	50.80	100.08	763.52	787.40	812.80	44	22.35	846.07	9.65
32	941.32	45.97	53.85	107.95	814.32	839.72	863.60	48	22.35	900.18	9.65
34	39.56 1004.8	49.28	57.15	110.24	865.12	892.05	920.75	40	25.40	957.33	9.65
36	1057.1	52.32	58.67	117.35	915.92	944.63	971.55	44	25.40	1009.7	9.65
38	1124.0	53.85	63.50	123.95	968.25	996.95	1022.4	40	28.45	1069.8	9.65
40	1174.8	55.63	66.55	128.52	1019.0	1049.3	1079.5	44	28.45	1120.6	9.65
42	1225.6	58.67	68.33	133.35	1069.8	1101.9	1130.3	48	28.45	1171.4	11.18
44	1276.4	60.45	71.37	136.65	1120.6	1152.7	1181.1	52	28.45	1222.2	11.18
46	1341.4	61.98	74.68	144.53	1171.4	1205.0	1234.9	40	31.75	1284.2	11.18
48	1392.2	65.02	77.72	149.35	1222.2	1257.3	1289.1	44	31.75	1335.0	11.18

ASME B16.47 Series B Class 300 Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
26	866.65	88.90	88.90	144.53	665.23	701.55	736.60	32	35.05	803.15	14.22
28	920.75	88.90	88.90	149.35	716.03	755.65	787.40	36	35.05	857.25	14.22
30	990.60	93.73	93.73	157.99	768.35	812.80	844.55	36	38.10	920.75	14.22
32	1054.1	103.12	103.12	168. 15	819.15	863.60	901.70	32	41.15	977.90	15.75
34	1107.9	103.12	103.12	172.97	869.95	917.45	952.50	36	41.15	1031.7	15.75
36	1171.4	103.12	103.12	180.85	920.75	965.20	1009.7	32	44.45	1089.2	15.75
38	1222.2	111.25	111.25	192.02	971.55	1016.0	1060.5	36	44.45	1140.0	15.75
40	1273.0	115.82	115.82	198.37	1022.4	1066.8	1114.6	40	44.45	1190.8	15.75
42	1333.5	119.13	119.13	204.72	1074.7	1117.6	1168.4	36	47.75	1244.6	15.75
44	1384.3	127.00	127.00	214.38	1125.5	1173.2	1219.2	40	47.75	1295.4	15.75
46	1460.5	128.52	130.05	222.25	1176.3	1228.9	1270.0	36	50.80	1365.3	15.75
48	1511.3	128.52	134.87	223.77	1227.1	1277.9	1327.2	40	50.80	1416. 1	15.75

ASME B16.47 Series A Class 400 lb, 600 lb and 900 lb Dimensions

Nominal Pipe S ize	A	C		D	E	F	G	H	I	J	R
	Overall Diameter	WNF Flange Thickness min	Blind Flange Thickness min	Overall Length WNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	mm	mm	mm	mm	mm	mm	mm	Number of Holes	mm	mm	mm
Class 400
26	850.90	88.90	88.90	149.35	660.40	688.85	711.20	28	38.10	781.05	11.18
28	914.40	95.25	95.25	158.90	711.20	739.65	762.00	24	41.15	838.20	12.70
30	971.55	101.60	101.60	169.93	762.00	793.75	590.55	28	41.15	895.35	12.70
32	1035.1	107.95	107.95	179.32	812.80	844.55	873.25	28	44.45	952.50	12.70
34	1085.9	111.25	111.25	187.45	863.60	898.65	927.10	32	44.45	1003.3	14.22
36	1155.7	119.13	119.13	200. 15	914.40	952.50	980.95	28	47.75	1066.8	14.22
Class 600
26	889.00	111.25	111.25	180.85	660.40	698.50	726.95	28	44.45	806.45	12.70
28	952.50	115.82	115.82	190.50	711.20	752.35	784.35	28	47.75	863.60	12.70
30	1022.4	125.48	127	204.72	762.00	806.45	841.25	28	50.80	927.10	12.70
32	1085.9	130.05	134.87	215.90	812.80	860.55	895.35	28	53.85	984.25	12.70
34	1162.1	141.22	144.27	233.43	863.60	914.40	952.50	24	60.45	1054.1	14.22
36	1212.9	146.05	150.88	242.82	914.40	968.25	1009.7	28	60.45	1104.9	14.22
Class 900
26	1022.4	134.87	153.92	258.83	660.40	742.95	762.00	20	66.55	901.70	11.18
28	1104.9	147.57	166.62	276.35	711.20	797.05	819.15	20	73.15	971.55	12.70
30	1181.1	155.45	176.02	289.05	762.00	850.90	876.30	20	79.25	1035.1	12.70
32	1238.3	160.27	185.67	303.28	812.80	908.05	927.10	20	79.25	1092.2	12.70
34	1314.5	171.45	195.07	319.02	863.60	962. 15	990.60	20	85.85	1155.7	14.22
36	1346.2	172.97	201.68	325.37	914.40	1016.0	1028.7	24	79.25	1200.2	14.22

Differences between Series B and Series A Flanges

Thickness and Weight: Series B flanges are thinner and lighter.

Number and Size of Bolts: Series B flanges utilize a larger number of smaller-diameter bolts, while Series A flanges utilize a smaller number of larger-diameter bolts.

Strength and Load-Carrying Capacity: Series A flanges are thicker and heavier, capable of withstanding higher external loads, making them more popular in more demanding, high-pressure environments. Series B flanges are more suitable for general pipe connections.

Flange Types: ASME B16.47 Series B primarily includes weld neck flanges and blind flanges and is the only series in the standard to offer a Class 75 pressure rating.

Applications of ASME B16.47 Series B Flanges