5. ANSI flange standard

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Flanges Welding Neck

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Product Description:

Weld neck flanges are a type of equipment designed for long and studded necks, which are connected to the pipe through the welding process. We have weld necks that create a strong connection and withstand high pressure. The weld neck is cylindrical, corresponding to the pipe size, helping to create a continuous transition from the pipe to the front.

Application:

Weld neck flanges are commonly used in applications that require a strong, high-strength connection, including:

Oil and gas industry : Used in pipeline systems for transporting oil, gas and petrochemical products.
Chemical industry : Applied in chemical pipeline systems, fertilizer environments and other corrosive substances.
Power Plants : Used in systems for conveying water, steam and other substances in thermal and hydroelectric power plants.
Marine Industry : Applied in piping systems on ships and offshore structures.

Standard version:

Weld neck flanges (weld neck fronts) according to ANSI (American National Standards Institute) standards are often added according to ANSI/ASME B16.5 standards. This is an important and widely used standard for products in energy pipeline systems.

Size: Specifies standard dimensions for cold-neck clothing including outer diameter, inner diameter, thickness, feather diameter and distance between feather holes.
Material: Carbon steel, stainless steel, alloy steel and other metal materials suitable for the tool working conditions.
Pressure and Temperature: The welded neck facade must meet the requirements for working pressure and temperature, classified according to pressure classes (classes) from 150 to 2500.

Welding Neck Flanges Dimensions and Thickness (ANSI/ASME B16.5)

NPS (inch)	Outside diameter (OD)	Inside diameter (ID)	Thickness (T)	Bolt Circle Diameter	Number of Bolts	Bolt Hole Diameter
1/2	3.50	0.62	0.31	2.38	4	0.63
3/4	3.88	0.82	0.38	2.75	4	0.63
1	4.25	1.05	0.38	3.12	4	0.63
1 1/4	4.63	1.38	0.38	3.50	4	0.63
1 1/2	5.00	1.61	0.38	3.88	4	0.63
2	6.00	2.07	0.38	4.75	4	0.75
2 1/2	7.00	2.47	0.38	5.50	4	0.75
3	7.50	3.07	0.38	6.00	4	0.75
4	9.00	4.03	0.38	7.50	8	0.75
5	10.00	5.05	0.44	8.50	8	0.88
6	11.00	6.07	0.44	9.50	8	0.88
8	13.50	7.98	0.50	11.75	8	0.88
10	16.00	10.02	0.56	14.25	12	1.00
12	19.00	12.02	0.62	17.00	12	1.00
14	21.00	14.02	0.69	18.75	12	1.13
16	23.50	16.02	0.75	21.25	16	1.13
18	25.00	18.02	0.81	22.75	16	1.25
20	27.50	20.02	0.88	25.00	20	1.25
24	32.00	24.02	1.00	29.50	20	1.38

Note:

Dimensions may vary based on manufacturer’s options and project specific tooling requirements.
Web thickness (T) may vary based on performance and other technical requirements.
The inside diameter (ID) can be changed according to the requirement of the connecting pipe.

Material Summary Table of Weld Neck Flange Materials

Material type	Material material	Standard	Application
Carbon steel	ASTM A105	ASME B16.5	Widely used in high pressure, normal temperature systems.
Improved Carbon Steel	ASTM A350 LF2	ASME B16.5	Use in low temperature conditions.
Stainless Steel	ASTM A182 F304/F316	ASME B16.5	High corrosion resistance, used in chemical and petroleum industries.
Alloy steel	ASTM A182 F11/F22	ASME B16.5	Use in high temperature, pressure conditions.
Duplex Stainless Steel	ASTM A182 F51/F53	ASME B16.5	Has better corrosion resistance and strength than conventional steel.
Super Duplex Stainless Steel	ASTM A182 F55	ASME B16.5	Outstanding corrosion resistance and strength, used in harsh environments.
Austenitic stainless steel	ASTM A182 F321/F347	ASME B16.5	Good corrosion resistance and heat resistance, used in high temperature applications.
Nickel Alloy	ASTM B564 (Inconel, Monel)	ASME B16.5	Good heat resistance and corrosion resistance, used in chemical, petroleum, aerospace industries.
Martensitic Stainless Steel	ASTM A182 F6a/F6NM	ASME B16.5	Corrosion and abrasion resistant, used in the oil and gas industry.
Copper Alloy	ASTM B61/B62	ASME B16.5	Good corrosion resistance, used in chemical industry and seawater.

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5. ANSI flange standard

All products

Flanges Welding Neck

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Product Description:

Application:

Standard version:

Welding Neck Flanges Dimensions and Thickness (ANSI/ASME B16.5)

NPS (inch)

Outside diameter (OD)

Inside diameter (ID)

Thickness (T)

Bolt Circle Diameter

Number of Bolts

Bolt Hole Diameter

1/2

3.50

0.62

0.31

2.38

4

0.63

3/4

3.88

0.82

0.38

2.75

4

0.63

1

4.25

1.05

0.38

3.12

4

0.63

1 1/4

4.63

1.38

0.38

3.50

4

0.63

1 1/2

5.00

1.61

0.38

3.88

4

0.63

2

6.00

2.07

0.38

4.75

4

0.75

2 1/2

7.00

2.47

0.38

5.50

4

0.75

3

7.50

3.07

0.38

6.00

4

0.75

4

9.00

4.03

0.38

7.50

8

0.75

5

10.00

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