ANSI B16.5 Weld Neck Flange

Description

Product Description ANSI/ASME B16.5 Weld Neck Flange

ANSI/ASME B16.5 Weld Neck Flange is a vital component used in industrial piping systems to create secure, high-pressure connections. This flange is designed to provide excellent structural integrity and withstand extreme temperatures and pressures. The Weld Neck Flange features a long, tapered neck that gradually tapers into the pipe, creating a smooth transition that enhances the strength of the connection and minimizes the risk of leaks or stress fractures.

As per ANSI/ASME B16.5, this flange standard covers sizes ranging from 1/2 inch to 24 inches and includes specifications for materials, pressure-temperature ratings, and dimensional tolerances. The design of the Weld Neck Flange allows for a strong welded joint, making it ideal for applications where safety and durability are paramount, such as in the oil and gas, chemical, and power generation industries.

The flange is commonly used in high-pressure, high-temperature environments due to its ability to distribute stresses evenly and resist the forces exerted by the fluid or gas within the pipe. The material selection for ANSI/ASME B16.5 Weld Neck Flanges includes carbon steel, stainless steel, and alloys, ensuring durability, corrosion resistance, and long service life.

Key Features:

1. Size Range:
   • Available in sizes NPS 1/2″ to NPS 24″ (DN 15 to DN 600).
2. Design for Durability:
   • The flange features a long tapered neck that connects securely to the pipe, offering additional strength and resistance to mechanical stress.
3. Pressure Rating:
   • Meets Class 150, 300, 600, 900, 1500, and 2500 pressure ratings.
4. Material Options:
   • Typically made from carbon steel, stainless steel, and alloy steel, with customization for special alloys based on service conditions.
5. Face Types:
   • Commonly available with raised face (RF) or flat face (FF) configurations for various sealing requirements.

ANSI/ASME B 16.5 Weld Neck Flange Dimensions

Class 150 Weld Neck Flange Dimensions

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		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	Welding Neck bore is derived from the pipe schedule	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

Class 150 Weld Neck Flange Stud & Bolt Dimensions

Size in Inch	Size in mm	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
1/2	15	4	1/2	50	55	5/8	M14	0.6
3/4	20	4	1/2	50	65	5/8	M14	0.9
1	25	4	1/2	55	65	5/8	M14	1.4
1 1/4	32	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	4	1/2	65	70	5/8	M14	1.8
2	50	4	5/8	70	85	3/4	M16	2.7
2 1/2	65	4	5/8	75	90	3/4	M16	3.7
3	80	4	5/8	75	90	3/4	M16	4.6
3 1/2	90	8	5/8	75	90	3/4	M16	5.5
4	100	8	5/8	75	90	3/4	M16	6.8
5	125	8	3/4	85	95	7/8	M20	8.7
6	150	8	3/4	85	100	7/8	M20	10.9
8	200	8	3/4	90	110	7/8	M20	17.7
10	250	12	7/8	100	115	1	M24	24
12	300	12	7/8	100	120	1	M24	37
14	350	12	1	115	135	1 1/8	M27	50
16	400	16	1	115	135	1 1/8	M27	64
18	450	16	1 1/8	125	145	1 1/4	M30	68
20	500	20	1 1/8	140	160	1 1/4	M30	82
24	600	20	1 1/4	150	170	1 3/8	M33	118

Class 300 Weld Neck Flange Dimensions

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	95	12.7	38	21.3	51		34.9	2	66.7	1.6
3/4	20	115	14.3	48	26.7	56		42.9	2	82.6	1.6
1	25	125	15.9	54	33.4	60		50.8	2	88.9	1.6
1 1/4	32	135	17.5	64	42.2	64		63.5	2	98.4	1.6
1 1/2	40	155	19.1	70	48.3	67		73	2	114.3	1.6
2	50	165	20.7	84	60.3	68		92.1	2	127	1.6
2 1/2	65	190	23.9	100	73	75		104.8	2	149.2	1.6
3	80	210	27	117	88.9	78		127	2	168.3	1.6
3 1/2	90	230	28.6	133	101.6	79	Welding Neck bore is derived from the pipe schedule	139.7	2	184.2	1.6
4	100	255	30.2	146	114.3	84		157.2	2	200	1.6
5	125	280	33.4	178	141.3	97		185.7	2	235	1.6
6	150	320	35	206	168.3	97		215.9	2	269.9	1.6
8	200	380	39.7	260	219.1	110		269.9	2	330.2	1.6
10	250	445	46.1	321	273	116		323.8	2	387.4	1.6
12	300	520	49.3	375	323.8	129		381	2	450.8	1.6
14	350	585	52.4	425	355.6	141		412.8	2	514.4	1.6
16	400	650	55.6	483	406.4	144		469.9	2	571.5	1.6
18	450	710	58.8	533	457	157		533.4	2	628.6	1.6
20	500	775	62	587	508	160		584.2	2	685.8	1.6
24	600	915	68.3	702	610	167		692.2	2	812.8	1.6

Class 300 Weld Neck Flange Stud & Bolt Dimensions

Size in Inch	Size in mm	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
1/2	15	4	1/2	55	65	5/8	M14	1.4
3/4	20	4	5/8	65	75	3/4	M16	1.4
1	25	4	5/8	65	75	3/4	M16	1.8
1 1/4	32	4	5/8	70	85	3/4	M16	2.3
1 1/2	40	4	3/4	75	90	7/8	M20	3.2
2	50	8	5/8	75	90	3/4	M16	4.1
2 1/2	65	8	3/4	85	100	7/8	M20	5.5
3	80	8	3/4	90	110	7/8	M20	6.8
3 1/2	90	8	3/4	95	110	7/8	M20	8.2
4	100	8	3/4	95	115	7/8	M20	11.4
5	125	8	3/4	110	120	7/8	M20	14.6
6	150	12	3/4	110	120	7/8	M20	19.1
8	200	12	7/8	120	140	1	M24	31
10	250	16	1	140	160	1 1/8	M27	42
12	300	16	1 1/8	145	170	1 1/4	M30	64
14	350	20	1 1/8	160	180	1 1/4	M30	82
16	400	20	1 1/4	165	190	1 3/8	M33	113
18	450	24	1 1/4	170	195	1 3/8	M33	145
20	500	24	1 1/4	185	205	1 3/8	M33	182
24	600	24	1 1/2	205	230	1 5/8	M39	264

Weight Chart

Flange Size (inches)	Class 150 (lbs)	Class 300 (lbs)	Class 400 (lbs)	Class 600 (lbs)	Class 900 (lbs)	Class 1500 (lbs)	Class 2500 (lbs)
½	2	2	3	3	7	7	8
¾	2	3	3.5	4	7	7	9
1	3	4	4	4	8.5	8.5	13
1¼	3	5	4.5	6	10	10	20
1½	4	7	8	8	14	14	28
2	6	9	10	12	24	24	42
2½	10	12	14	18	31	31	52
3	11.5	18	18	23	36	36	94
3½	12	20	26	26	53	53	146
4	16.5	26.5	35	42	86	86	244
5	21	36	43	68	110	110	378
6	26	45	57	81	187	187	576
8	42	69	89	120	268	268	1068
10	54	100	125	190	372	372	1608
12	88	142	175	226	562	562	-
14	114	206	233	347	685	685	-
16	140	250	295	481	924	924	-
18	165	320	360	555	1164	1164	-
20	197	400	445	690	2107	2107	-
22	225	465	505	720	-	-	-
24	268	580	640	977	-	-	-

Tolerance

Dimension	Tolerance
Outside Diameter (OD)	±1/16 in for ODs up to 24 in
	±1/8 in for ODs over 24 in
Inside Diameter (ID)	±1/32 in for diameters up to 10 in
	+1/16 in for diameters 12-18 in
	+1/8 in, -1/16 in for diameters over 20 in
Diameter of Contact Face	1/16 in
Raised Face	±1/32 in
Tongue and Groove or Male and Female	±1/64 in
Diameter of Hub at Point of Welding	+3/32 in, -1/32 in for hubs up to 5 in
	+5/32 in, -1/32 in for hubs over 6 in
Diameter of Hub at Base	±1/16 in for hub bases up to 24 in
	±1/8 in for hub bases over 24 in
Bolt Circle	±1/16 in
Bolt Hole Spacing	+1/32 in
Eccentricity of Bolt Circle and Facing	1/32 in max
Length Thru Hub	±1/16 in for lengths up to 10 in
	±1/8 in for lengths over 12 in
Thickness	+1/8 in, -0 in for thicknesses up to 18 in
	+3/16 in, -0 in for thicknesses over 20 in

Advantages:

• High mechanical strength and resistance to leakage.
• Ideal for extreme temperature and pressure environments.
• Versatile for a wide range of applications and industries.

Typical Applications:

• Oil and gas infrastructure.
• Chemical and petrochemical industries.
• Power plants.
• Refineries and industrial equipment