ASME/ANSI B16.5 & B16.47 - Steel Pipe Flanges and Fittings

Standard Information - ASME/ANSI B16.5 & B16.47 - Pipe Flanges and Flanged Fittings The ASME B16.5 standard covers various aspects of pipe flanges and flanged fittings, including pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and designating openings for these components. This standard includes flanges with rating class designations ranging from 150 to 2500, covering sizes from NPS 1/2 through NPS 24. It provides requirements in both metric and U.S units. It's important to note that this standard is limited to flanges and flanged fittings made from cast or forged materials, including blind flanges and specific reducing flanges made from cast, forged, or plate materials. For pipe flanges and flanged fittings larger than 24" NPS, ASME/ANSI B16.47 should be referenced. Common Flange Types ● Slip-On Flanges: These flanges are commonly stocked in ANSI Class 150, 300, 600, 1500 & 2500 up to 24" NPS. They are "slipped over" the pipe or fitting ends and welded in position, allowing for fillet welds both inside and outside the flange. Reduction versions are used to reduce line sizes when space is limited. ● Weld Neck Flanges: These flanges have a distinct long tapered hub and a smooth transition of thickness, ensuring a full penetration weld connection to the pipe or fitting. They are used in severe service conditions. ● Lap Joint Flanges: Paired with a stub end, lap joint flanges are slipped over the stub end fitting and connected by welding or other means. Their loose design allows for easy alignment during assembly and disassembly. ● Backing Flanges: These flanges lack a raised face and are used with backing rings, providing cost-effective solutions for flange connections. ● Threaded (Screwed) Flanges: Bored to match specific pipe inside diameters, threaded flanges are machined with tapered pipe threads on the reverse side, primarily for smaller bore pipes. ● Socket Weld Flanges: Resembling slip-on flanges, socket weld flanges are machined to match pipe size sockets, allowing fillet welding on the back side to secure the connection. They are typically used for smaller bore pipes. ● Blind Flanges: These flanges have no center hole and are used to close or block the end of a piping system. These are some of the common types of pipe flanges used in various industrial and commercial applications. The choice of flange type depends on factors like the pressure, temperature, and type of fluid being transported, as well as specific project requirements. Proper selection and installation of flanges are crucial for the safe and efficient operation of piping systems.

ASME B16.5: Carbon Steel, Stainless Steel, Alloy Steel

EN 1092-1: Carbon Steel, Stainless Steel, Alloy Steel

DIN 2501: Carbon Steel, Stainless Steel, Alloy Steel

GOST 33259: Carbon Steel, Stainless Steel, Alloy Steel

SABS 1123: Carbon Steel, Stainless Steel, Alloy Steel

Raw Material Checking, Chemical Analysis, Mechanical Test, Visual Inspection, Dimension Check, Bend Test , Flattening Test, Impact Test, DWT Test, Non-Destructive Examination（UT, MT, PT, X-Ray, ）, Hardness Test, Pressure Testing, Seat Leakage Testing, Metallography Testing, Corrosion Testing, Fire Resistance Testing, Salt Spray Testing, Flow Performance Testing, Torque and Thrust Testing, Painting and Coating Inspection, Documentation Review…..Flanges are important industrial parts used to connect pipes, valves, equipment and other piping components. They play a key role in connecting, supporting and sealing piping systems.Flanges serve as crucial components in various industrial applications, including:

ASME B16.5: Pipe Flanges and Flanged Fittings	Materials: Carbon Steel, Stainless Steel, Alloy Steel
EN 1092-1: Flanges and Their Joints - Circular Flanges for Pipes, Valves, Fittings, and Accessories, PN Designated - Part 1: Steel Flanges	Materials: Carbon Steel, Stainless Steel, Alloy Steel
DIN 2501: Flanges and Lapped Joints	Materials: Carbon Steel, Stainless Steel, Alloy Steel
GOST 33259: Flanges for Valves, Fittings, and Pipelines for Pressure to PN 250	Materials: Carbon Steel, Stainless Steel, Alloy Steel
SABS 1123: Flanges for Pipes, Valves, and Fittings	Materials: Carbon Steel, Stainless Steel, Alloy Steel

At Womic Steel, we understand the importance of secure packaging and reliable shipping when it comes to delivering our high-quality pipe fittings to your doorstep. Here's an overview of our packaging and shipping procedures for your reference: Packaging: Our pipe flanges are carefully packaged to ensure they reach you in perfect condition, ready for your industrial or commercial needs. Our packaging process includes the following key steps: ● Quality Inspection: Before packaging, all flanges undergo a thorough quality inspection to confirm they meet our stringent standards for performance and integrity. ● Protective Coating: Depending on the type of material and application, our flanges may receive a protective coating to prevent corrosion and damage during transportation. ● Secure Bundling: Flanges are bundled together securely, ensuring they remain stable and protected throughout the shipping process. ● Labeling and Documentation: Each package is clearly labeled with essential information, including product specifications, quantity, and any special handling instructions. Relevant documentation, such as certificates of compliance, is also included. ● Custom Packaging: We can accommodate special packaging requests based on your unique requirements, ensuring your flanges are prepared exactly as needed. Shipping: We collaborate with reputable shipping partners to guarantee reliable and timely delivery to your specified destination.Our logistics team optimizes shipping routes to minimize transit times and reduce the risk of delays.For international shipments, we handle all necessary customs documentation and compliance to facilitate smooth customs clearance.We offer flexible shipping options, including expedited shipping for urgent requirements.

● Connections ● Sealing ● Pressure Management● Piping Systems ● Valves ● Equipment

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Flange Length	RF Dia.	RF Height	PCD	Socket Bore	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H
1/2	15	90	9.6	30	14	34.9	2	60.3	22.2	4	1/2	50	55	5/8	M14	0.8
3/4	20	100	11.2	38	14	42.9	2	69.9	27.7	4	1/2	50	65	5/8	M14	0.9
1	25	110	12.7	49	16	50.8	2	79.4	34.5	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	14.3	59	19	63.5	2	88.9	43.2	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	125	15.9	65	21	73	2	98.4	49.5	4	1/2	65	70	5/8	M14	1.4
2	50	150	17.5	78	24	92.1	2	120.7	61.9	4	5/8	70	85	3/4	M16	2.3
2 1/2	65	180	20.7	90	27	104.8	2	139.7	74.6	4	5/8	75	90	3/4	M16	3.2
3	80	190	22.3	108	29	127	2	152.4	90.7	4	5/8	75	90	3/4	M16	3.7
3 1/2	90	215	22.3	122	30	139.7	2	177.8	103.4	8	5/8	75	90	3/4	M16	5
4	100	230	22.3	135	32	157.2	2	190.5	116.1	8	5/8	75	90	3/4	M16	5.9
5	125	255	22.3	164	35	185.7	2	215.9	143.8	8	3/4	85	95	7/8	M20	6.8
6	150	280	23.9	192	38	215.9	2	241.3	170.7	8	3/4	85	100	7/8	M20	8.6
8	200	345	27	246	43	269.9	2	298.5	221.5	8	3/4	90	110	7/8	M20	13.7
10	250	405	28.6	305	48	323.8	2	362	276.2	12	7/8	100	115	1	M24	19.5
12	300	485	30.2	365	54	381	2	431.8	327	12	7/8	100	120	1	M24	29
14	350	535	33.4	400	56	412.8	2	476.3	359.2	12	1	115	135	1 1/8	M27	41
16	400	595	35	457	62	469.9	2	539.8	410.5	16	1	115	135	1 1/8	M27	54
18	450	635	38.1	505	67	533.4	2	577.9	461.8	16	1 1/8	125	145	1 1/4	M30	59
20	500	700	41.3	559	71	584.2	2	635	513.1	20	1 1/8	140	160	1 1/4	M30	75
24	600	815	46.1	663	81	692.2	2	749.3	616	20	1 1/4	150	170	1 3/8	M33	100

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	RF Dia.	RF Height	PCD	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E
1/2	15	90	9.6	34.9	2	60.3	4	1/2	50	55	5/8	M14	0.9
3/4	20	100	11.2	42.9	2	69.9	4	1/2	50	65	5/8	M14	0.9
1	25	110	12.7	50.8	2	79.4	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	14.3	63.5	2	88.9	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	125	15.9	73	2	98.4	4	1/2	65	70	5/8	M14	1.8
2	50	150	17.5	92.1	2	120.7	4	5/8	70	85	3/4	M16	2.3
2 1/2	65	180	20.7	104.8	2	139.7	4	5/8	75	90	3/4	M16	3.2
3	80	190	22.3	127	2	152.4	4	5/8	75	90	3/4	M16	4.1
3 1/2	90	215	22.3	139.7	2	177.8	8	5/8	75	90	3/4	M16	5.9
4	100	230	22.3	157.2	2	190.5	8	5/8	75	90	3/4	M16	7.7
5	125	255	22.3	185.7	2	215.9	8	3/4	85	95	7/8	M20	9.1
6	150	280	23.9	215.9	2	241.3	8	3/4	85	100	7/8	M20	11.8
8	200	345	27	269.9	2	298.5	8	3/4	90	110	7/8	M20	20.5
10	250	405	28.6	323.8	2	362	12	7/8	100	115	1	M24	32
12	300	485	30.2	381	2	431.8	12	7/8	100	120	1	M24	50
14	350	535	33.4	412.8	2	476.3	12	1	115	135	1 1/8	M27	64
16	400	595	35	469.9	2	539.8	16	1	115	135	1 1/8	M27	82
18	450	635	38.1	533.4	2	577.9	16	1 1/8	125	145	1 1/4	M30	100
20	500	700	41.3	584.2	2	635	20	1 1/8	140	160	1 1/4	M30	130
24	600	815	46.1	692.2	2	749.3	20	1 1/4	150	170	1 3/8	M33	196

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	90	9.6	30	21.3	46	Welding Neck bore is derived from the pipe schedule	34.9	2	60.3	1.6
3/4	20	100	11.2	38	26.7	51		42.9	2	69.9	1.6
1	25	110	12.7	49	33.4	54		50.8	2	79.4	1.6
1 1/4	32	115	14.3	59	42.2	56		63.5	2	88.9	1.6
1 1/2	40	125	15.9	65	48.3	60		73	2	98.4	1.6
2	50	150	17.5	78	60.3	62		92.1	2	120.7	1.6
2 1/2	65	180	20.7	90	73	68		104.8	2	139.7	1.6
3	80	190	22.3	108	88.9	68		127	2	152.4	1.6
3 1/2	90	215	22.3	122	101.6	70		139.7	2	177.8	1.6
4	100	230	22.3	135	114.3	75		157.2	2	190.5	1.6
5	125	255	22.3	164	141.3	87		185.7	2	215.9	1.6
6	150	280	23.9	192	168.3	87		215.9	2	241.3	1.6
8	200	345	27	246	219.1	100		269.9	2	298.5	1.6
10	250	405	28.6	305	273	100		323.8	2	362	1.6
12	300	485	30.2	365	323.8	113		381	2	431.8	1.6
14	350	535	33.4	400	355.6	125		412.8	2	476.3	1.6
16	400	595	35	457	406.4	125		469.9	2	539.8	1.6
18	450	635	38.1	505	457.2	138		533.4	2	577.9	1.6
20	500	700	41.3	559	508	143		584.2	2	635	1.6
24	600	815	46.1	663	610	151		692.2	2	749.3	1.6

Flange Materials Flanges are welded to pipe and equipment nozzle. Accordingly, it is manufactured from the following materials; ● Carbon steel ● Low alloy steel ● Stainless steel ● Combination of Exotic materials (Stub) and other backing materials The list of materials used in manufacturing is covered in ASME B16.5 & B16.47. ● ASME B16.5 -Pipe Flanges and Flanged Fittings NPS ½” to 24” ● ASME B16.47 -Large Diameter Steel Flanges NPS 26” to 60” Commonly used Forged material grads are ● Carbon Steel: – ASTM A105, ASTM A350 LF1/2, ASTM A181 ● Alloy Steel: – ASTM A182F1 /F2 /F5 /F7 /F9 /F11 /F12 /F22 ● Stainless Steel: – ASTM A182F6 /F304 /F304L /F316 /F316L/ F321/F347/F348