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Weld Neck Flange

Your Professional Weld Neck Flange Supplier

 

Established in 2009 as a national high-tech enterprise with 15 years of expertise in R&D, production, and sales of stainless steel pipe fittings and pipeline accessories.

 

Our popular product offerings primarily include butt welding pipe fittings, forged pipe fittings, stainless steel flanges, stainless steel pipes, and related components.

 
 
Why Choose us

Advanced Production Equipment

We utilize specialized equipment for precision cutting, forming, welding, heat treatment, and surface finishing. Examples include heat treatment furnaces, large hydraulic press machines for manufacturing tees and reducers, laser cutting machines for pipes, high-power fiber laser cutting machines for plates, and elbow cold forming machines, among others.

Quality Control

Our quality and safety management systems are certified under ISO 9001:2015, API Q1, ISO 45001 (OHSMS), and ISO 14001 (Environmental Management System), ensuring compliance with international standards.

Specialized Workshops

We maintain a fully equipped physical and chemical laboratory, along with a dedicated inspection workshop, to support comprehensive quality assurance and control processes.

 

Parameter

 

Nominal diameter DN

Outer path D

Bolt hole center circle diameter K

Bolt hole diameter L

Number of bolts N

Flange thickness C

15

95

65

14

4

14

20

105

75

14

4

16

25

115

85

14

4

16

32

140

100

18

4

18

40

150

110

18

4

18

50

165

125

18

4

20

65

185

145

18

4

20

80

200

160

18

8

20

100

220

180

18

8

22

125

250

210

18

8

22

150

285

240

22

8

24

200

340

295

22

8

26

250

395

350

22

12

28

300

445

400

22

12

30

400

565

515

26

16

36

500

670

620

26

20

40

600

780

725

30

20

44

800

990

920

33

24

50

1000

1210

1120

36

28

56

1200

1440

1340

39

32

64

1500

1755

1640

42

36

78

 

Benefits of Weld Neck Flange

 
 
01
 

Reduced friction and interference:

The welded connection will not interfere with the flow of the fluid. With the reduced friction, the fluid will not develop turbulence allowing for less vibration and a smoother flow. Less turbulence will also allow for a quieter operation.

 
02
 

Easier Alignment:

The neck of the flange will allow for a more accurate easier alignment to the pipe saving time. The alignment is also much more precise with less tolerance.

 
03
 

Testing of the pipe and joints are easier:

Radiography test can be much easier to perform because of the easy access the flanges allow.

 
04
 

Durable connection:

Stress on the inside is transferred to the neck of the flange taking the pressure off the pipe allowing for a more permanent connection.

 
05
 

Leakage prevention:

In most applications using the weld neck flanges, the weld is made inside and outside of the flange. This will provide a connection that is more leak proof.

ASME B16.5 Steel Flanges

 

Differences Between Weld Neck Flanges and Slip-On Flanges

Strength and Pressure Tolerance

Its Weld neck flanges offer greater strength due to their solid hub with full-penetration welding process and full penetration weld, which withstand higher pressures and temperatures than their slip-on counterparts with simpler fillet welds; they're best used in low to medium pressure applications.

Welding Requirements

Flange joints typically require full butt welds to strengthen and absorb stress, while slip-on flanges use two fillet welds instead, which provide less structural integrity but require two less complex welds for attachment.

Cost Considerations

Initial installation costs for weld neck flanges tend to be higher due to material and welding requirements; however, they could ultimately prove more cost-effective for higher stress applications over time. Slip-on flanges tend to be less expensive for installation; however, they may require additional maintenance expenses in the future.

Installation Complexity

Weld neck flanges require more skill and time for installation, while slip-on flanges can be installed more quickly, making them suitable for low pressure systems where strength isn't as paramount.

 

Maintenance Precautions For Weld Neck Flange

Long-term storage of weld neck flange, should be regularly maintained, often open to the outside of the production and processing surface must be kept clean, eliminate stains, neatly stored in a natural ventilated dry and manetic place, prohibited stacking or outdoor storage. To maintain the dry steel flange and natural ventilation, transparent retainer clean and neat, in accordance with the proper storage way.

 

Before installation, be sure to check each specification and size of weld neck flange: Whether the pipe diameter is in accordance with the application regulations, remove the shortcomings caused by the transportation process, and remove the stains of weld neck flange, do well in advance preparation before installation, everything is ready.

 

During installation, the weld neck flange can be immediately installed on the pipeline according to the interface mode, and the installation can be carried out according to the application position. In general, it can be installed on any part of the pipeline, but it needs to be conducive to the maintenance of the actual operation. Pay attention to the material inflow of the weld neck flange should be the longitudinal valve disc under the celebrity, and the weld neck flange is only horizontal installation. Weld neck flange in the installation should pay attention to the tightness, to avoid leakage, harm all the normal operation of the pipeline.

 

Weld neck flange gate valve, stop valve, stop valve application, only for open full or full seal, is not allowed to adjust the total flow, in order to prevent erosion of the surface, accelerate damage. The stop valve and the upper external thread stop valve have inverted sealing equipment, and the handle is tightened to the upper part to prevent the material from leaking from the filling material.

 

 

Logistics

We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

 
 

The time frame of an order delivery is divided into two parts:

Processing time: 7-14 Days

Shipping time: 20~30 Days

 
 
 

Shipping methods:

DDP, DAP, EXW, etc.

 
 
 

Shipping fee:

The shipping fee will be changed according to every pacel's weight.

 

 

FAQ

Q: How are weld neck flanges welded?

A: Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts. Such flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress.

Q: What is a weld neck flange?

A: A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

Q: What is the bevel angle of a weld neck flange?

A: Bevel end pipes are sometimes called 'weld end' or 'butt weld end' because they are cut with the intention of the ends being welded. A 'bevel' is any cut that is not perpendicular (90⁰) to the length orientation of the pipe. The standard bevel angle is 37.5⁰ although this can be varied.

As one of the leading weld neck flange manufacturers and suppliers in China, we warmly welcome you to buy high quality weld neck flange made in China here from our factory. Good service and punctual delivery are available.

ASME B16 5 Steel Flanges, ASME B16 9 Weld Neck Flange Dimensions, stainless steel flanges