ASME B16.5 Superior Weld Neck Flange

| ASME B16.5 Superior Weld Neck Flange

Stainless steel weld neck flange is a flange with a tapered neck, which is connected to the cylinder or pipe by butt welding. WN flange is an integral flange, and its tapered neck transition structure and butt welding connection significantly enhance the strength and rigidity of the flange.

Welding neck flange is characterized by butt-welding process, the flange and the pipeline are closely combined, and can withstand high temperature and high pressure and high frequency vibration and other harsh environmental conditions under the use of the requirements; at the same time, the necking butt-welding flange also has a compact structure and easy to install.

There are certain differences in structure and use between forged neck welding flanges and weld plate flanges, and they cannot be replaced at will. When choosing the flange type, it is necessary to determine it according to the specific use environment and requirements.

During installation and use, it is necessary to strictly abide by relevant standards and specifications to ensure the quality and safety of flange connections.

| Advantage

1. Non-leakage Connection

    Weld neck flanges ensure secure and durable connections between pipelines, minimizing leakage risks. By welding the neck to the pipeline, a strong bond is created for seamless fluid transmission. These flanges are crucial for pipeline efficiency and safety in global fluid transportation systems.

2. Security Assurance

    Stainless steel flanges contain a high proportion of chromium and nickel. For example, 304 stainless steel flanges contain 8-10.5% nickel and 18-20% chromium, which enables them to be used for a long time in harsh environments, reducing the frequency of maintenance and replacement, thereby reducing operating costs and improving system safety.

3. High Pressure Adaption

    The neck welded flange can withstand high temperature and high pressure, and is suitable for various high temperature and high pressure working environments to ensure the normal operation of the pipeline system. The high stiffness and ductility of carbon steel as well as the corrosion resistance of stainless steel make it suitable for complex engineering project.

4. Easy Maintenance

    The pipeline system connected with neck welded flanges facilitates maintenance and replacement of pipeline components, reducing the cost and time of maintenance and replacement of components.

| Size

Weld Neck Flange Class 150 lb Dimension
NPS	A	B	C	D	E	F	G	H	I	J	W
	inch	inch	inch	inch	inch	inch	inch	No. of Holes	inch	inch	kg/pc
	mm	mm	mm	mm	mm	mm	mm		mm	mm
1/2	3.5	0.62	0.44	1.88	0.84	1.19	1.38	4	0.62	2.38	0.48
	88.9	15.7	11.2	47.8	21.3	30.2	35		15.7	60.45
3/4	3.88	0.82	0.5	2.06	1.05	1.5	1.69	4	0.62	2.75	0.71
	98.6	20.8	12.7	52.3	26.7	38.1	42.9		15.7	69.85
1	4.25	1.05	0.56	2.19	1.32	1.94	2	4	0.62	3.12	1.01
	108	26.7	14.2	55.6	33.5	49.3	50.8		15.7	79.25
1 1/4	4.62	1.38	0.62	2.25	1.66	2.31	2.55	4	0.62	3.5	1.33
	117.3	35.1	15.7	57.15	42.2	58.7	63.5		15.7	88.9
1 1/2	5	1.61	0.69	2.44	1.9	2.56	2.88	4	0.62	3.88	1.72
	127	40.9	17.5	62	48.3	65	73.15		15.7	98.6
2	6	2.07	0.75	2.5	2.38	3.06	3.62	4	0.75	4.75	2.58
	152.4	52.6	19.1	63.5	60.45	77.7	91.9		19.1	120.7
2 1/2	7	2.47	0.88	2.75	2.88	3.56	4.12	4	0.75	5.5	4.11
	177.8	62.7	22.4	69.85	73.15	90.4	104.6		19.1	139.7
3	7.5	3.07	0.94	2.75	3.5	4.25	5	4	0.75	6	4.92
	190.5	78	23.9	69.85	88.9	108	127		19.1	152.4
3 1/2	8.5	3.55	0.94	2.81	4	4.81	5.5	8	0.75	7	6.08
	215.9	90.2	23.9	71.4	101.6	122.2	139.7		19.1	177.8
4	9	4.03	0.94	3	4.5	5.31	6.19	8	0.75	7.5	6.84
	228.6	102.4	23.9	76.2	114.3	134.9	157.2		19.1	190.5
5	10	5.05	0.94	3.5	5.56	6.44	7.31	8	0.88	8.5	8.56
	254	128.3	23.9	88.9	141.2	163.6	185.7		22.4	215.9
6	11	6.07	1	3.5	6.63	7.56	8.5	8	0.88	9.5	10.6
	279.4	154.2	25.4	88.9	168.4	192	215.9		22.4	241.3
8	13.5	7.98	1.12	4	8.63	9.69	10.62	8	0.88	11.75	17.6
	342.9	202.7	28.4	101.6	219.2	246.1	269.7		22.4	298.5
10	16	10.02	1.19	4	10.75	12	12.75	12	1	14.25	24
	406.4	254.5	30.2	101.6	273	304.8	323.8		25.4	362
12	19	12	1.25	4.5	12.75	14.38	15	12	1	17	36.5
	482.6	304.8	31.75	114.3	323.8	365.3	381		25.4	431.8
14	21		1.38	5	14	15.75	16.25	12	1.12	18.75	48.4
	533.4		35.1	127	355.6	400.1	412.7		28.4	476.3
16	23.5		1.44	5	16	18	18.5	16	1.12	21.25	60.6
	596.9		36.6	127	406.4	475.2	469.9		28.4	539.8
18	25		1.56	5.5	18	19.88	21	16	1.25	22.75	68.3
	635		39.6	139.7	457.2	505	533.4		31.75	577.9
20	27.5		1.69	5.69	20	22	23	20	1.25	25	84.5
	698.5		42.9	144.5	508	558.8	584.2		31.75	635
24	32		1.88	6	24	26.12	27.25	20	1.38	29.5	115
	812.8		47.8	152.4	609.6	663.4	692.1		35.1	749.3

| Production Process