What is the difference between socket weld flanges with neck and socket weld flanges without neck?

What is socket welding flange?

Socket welding flange refers to a flange that is inserted into the flange ring ladder at the end of a pipe and welded at the end and outside of the pipe. There are two types: with and without a neck. The neck pipe flange has good rigidity, small welding deformation, and good sealing performance, and can be used in situations with pressures ranging from 1.0 to 10.0MPa. Type B flanges for containers are also socket welded flanges, used in situations with high sealing requirements. During design, socket welding flanges can be checked as integral flanges.

Features of Socket welding flange

Socket welding is usually used for small pipes with a diameter less than DN40 and is more economical. Butt welding is usually used for parts above DN40. Socket welding is the process of first inserting the socket and then welding it (for example, there is a flange called a socket flange, which is a convex welding flange that is connected to other parts (such as valves). The connection form of butt welding flange and pipeline welding, socket welding usually involves inserting the pipeline into the flange and welding it, while butt welding uses the butt welding flange to weld the pipeline to the mating surface. Although X-ray inspection is not possible, butt welding is acceptable. Therefore, it is recommended to use butt welding flanges to improve the requirements for welding inspection.

Welding sockets are often used under high pressure due to their reinforcement effect, but socket welding also has drawbacks. Firstly, the stress state after welding is poor, making it difficult to completely melt. The trend is that there are gaps in pipeline systems, making them unsuitable for medium sensitive to crevice corrosion and pipeline systems with high cleanliness requirements; Use socket welding; There are also ultra-high pressure pipelines. Even in small diameter pipelines, there is a large wall thickness and socket welding can be avoided as much as possible through butt welding.

Techspecs

Range of external diameter: 100 mm to 15000 mm

Carbon Steel：ASTM A105、20#、Q235、16Mn、 ASTM A350 LF1, LF2,CL1/CL2,LF3 CL1/CL2、ASTM A694 F42, F46,F48, F50, F52, F56, F60, F65, F70；

Stainess Steel： ASTM A182 F304、304L、 F316、316L、1Cr18Ni9Ti、0Cr18Ni9Ti、321、18-8；

Alloy Steel： ASTM A182 F1、 F5a、 F9、 F11、 F12、 F22、 F91、A182F12、A182F11、16MnR、Cr5Mo、12Cr1MoV、15CrMo、12Cr2Mo1、A335P22、St45.8/Ⅲ；

What is the difference between socket weld flanges with neck and socket weld flanges without neck?

There are the following differences between socket weld flanges with neck and socket weld flanges without neck:

Structural features

The socket welding flange with neck has a short neck and a low neck height, which improves the stiffness and bearing capacity of the flange.

Socket weld flanges without necks do not have necks, are usually flat and have a relatively simple structure, and are also known as plate socket weld flanges.

Performance

The socket welding flange with neck has good rigidity, small welding deformation and good sealing, and can be used for occasions with pressure of 1.0 - 10.0MPa.

Due to the lack of neck reinforcement, the rigidity, bearing capacity and tightness of the socket welding flange without neck are worse than those of the socket welding flange with neck, which is generally suitable for occasions with low pressure and low sealing requirements.

Scope of application

Socket welded flanges with necks are often used in occasions with high requirements for the strength and tightness of pipeline connections, such as petrochemical, electric power, pharmaceutical and other industries, and are more common in some pipeline systems with high temperature, high pressure, flammable, explosive or corrosive media.

Socket welded flanges without necks are suitable for some piping systems with relatively low pressure and sealing requirements, such as some ordinary water supply and drainage pipes, low-pressure ventilation pipes, etc.

Processing and manufacturing

The manufacturing process of socket weld flanges with necks is relatively complex, requiring processing of the neck, and the material consumption is relatively large, so the cost is relatively high.

The socket welding flange without neck is simple to manufacture, convenient to take materials, and low cost.

Installation & Maintenance

When the neck socket welding flange is installed, due to the existence of the neck, the centering requirements for the pipeline are relatively high, but the stability of the pipeline is better after installation; In terms of maintenance, because of its good sealing performance, the probability of leakage and other problems is relatively low, and the maintenance cost is relatively low.

Socket welded flanges without necks are more convenient to install and have relatively low requirements for pipe alignment, but in long-term use, due to their relatively poor sealing performance, they may need to be inspected and maintained more frequently to ensure the normal operation of the pipeline system.

Supplier of Socket welding flange

LTZC provides Socket welding flange.If you're looking for a reliable supplier of socket weld flanges, look no further than LTZC. We understand the importance of competitive pricing in today's market. Therefore, we invite you to contact us for the latest and most competitive quotes. Our dedicated team of experts is on hand to help you and answer any questions you may have about product specifications, customization options, or delivery schedules. Trust LTZC to meet all your socket weld flange requirements and experience seamless pipe connections like never before.