Description

Technical Parameters

Chuxin Flange: Your Professional Alloy Steel Flanges Manufacturer!

Chuxin Flange Fitting Co., Ltd., formerly known as Yongxing Jinggong Pipe Fitting Factory, founded in 1994, is a non-regional high-tech enterprise specializing in the design, development, production, sales and after-sales of flanges and pipe fittings. Our products sell well nationwide and far to overseas nations and regions.

Our Advantages

Rich Experience
Established in 1994, our company has about 30 years' experience in the design, development, production, sales and after sales service of flanges and pipe fitting.

Advanced Equipment
Our company has processing equipment and advanced testing instruments including hundreds of high-precision CNC lathes and desktop spectrometers, portable spectrometers, universal testing machines, impact testing machines, ultrasonic flaw detectors, metallographic detectors, Rockwell hardness testers, low-temperature cryogenic treatment tanks, etc.

Quality Control
Our products are produced and inspected strictly in accordance with GB, AISI, ASTM, API, JIS, BS so as to control and safeguard the quality of products. We successively obtained ISO9001-2008 quality control system and CE (2014/68/EU) certification and API certification.

High Quality Product
Our company provides flanges made from high-temperature-resistant alloy steel and low-temperature alloy steel, where the high-temperature-resistant materials products can be long-term operated under high temperature above 600°C and under certain stress action, the low-temperature materials products can be used under extreme work conditions below -196°C.

304 Stainless Steel Flanges

304 Stainless Steel Flanges are some of the most commonly used grades of flange. These are used to connect two or more pipes or other piping components together. The ASTM A182 F304 Pipe Flanges are made up of the 304 austenitic stainless steel which is a chromium nickel alloy. The material is stronger and has some extent of corrosion resistance in general purpose applications.

Stainless Steel 316 Flanges

Stainless Steel 316 Flanges are made up of the 316 austenitic stainless steel. This grade of steel is a chromium nickel molybdenum alloy. Since the addition of the molybdenum content, the fittings made of this material are stronger and corrosion resistant than the 304 stainless steel. There are different ASTM A182 F316 Pipe Flanges made in this grade and are used in applications that require corrosion resistance. The Grade F316 Blind Flanges are used in such applications to seal off pipes.

Stainless Steel Weld Neck Flange

Stainless Steel Weld Neck Flange has a long tapered hub and are often used for high pressure applications. This kind of flange is designed to be butt-welded to pipes and provide a high strength, leak-proof connection. They are commonly used in high-pressure applications, such as oil and gas pipelines, and are preferred where frequent dismantling is not required.

Bs4504 Pn16 Blind Flanges

Bs4504 Pn16 Blind plate is a flange cover with no hole in the middle, which is used to seal pipeline plugs. It is also called flange cover and blind flange. There are many types of sealing surface, including flat blind plate, convex surface, concave and convex surface, Tongue and groove surface, ring connection surface. The blind plate/flange cover has the characteristics of safe and convenient operation, low original consumption and high production efficiency.

Alloy Steel 8 Character Blind Plate

Alloy Steel 8 Character Blind Plate is usually used on pipelines with large diameters. Usually, the pipeline is kept open at the end of the flange, and if necessary, it is replaced with a blind plate of the same thickness at the other end to cut off the pipeline. Avoid forced expansion of the pipeline due to temporary replacement of other blind plates, affecting the entire system.

Alloy Steel DIN Cover Flange

Alloy Steel DIN Cover Flanges are special parts used to join pipes, valves, and machines in factories. They have different kinds and sizes, all made to follow the rules set by a group called Deutsches Institut für Normung (DIN), which is from Germany. These flanges help make sure things stay connected tightly and don't leak so liquids or gases can move smoothly through pipes. People like using DIN flanges because they're very carefully made, strong, and work well with other DIN parts. They're used a lot in industries like making oil and gas, chemicals, and generating power.

Alloy Steel DIN Loose Flange

Alloy Steel DIN Loose Flanges are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges. They are suitable for the connection of non-ferrous metals such as steel,aluminium and stainless acid-resistant steel containers and corrosion-resistant pipelines.

Alloy Steel DIN Threaded Flange

Alloy Steel DIN Threaded Flange connects a device securely to a pipe without the requirement of welding. It entirely relies on threads to create an unbreakable and leakage-free connection between the flange and the pipe. They are also called screw flanges, a type of pipe flange with internal threads.

Alloy Steel Large Diameter Steel Pipe Flange

Large diameter flange is a kind of flange, which is widely used and popularized in the mechanical industry, chemical industry, wind power industry and sewage treatment industry.Large diameter steel flange refers to the flange with diameter over DN250, mainly made of carbon steel, stainless steel and alloy steel.

Introduction to Raised Face Weld Neck

Raised Face Weld Neck Flanges are one of the most commonly used flanges in the piping industry. They are easy to recognize with their long tapered hub that is matched to the wall thickness (bore) of the pipe.

Advantages of Raised Face Weld Neck

Superior Strength
Raised face weld neck flanges are incredibly strong due to their welded neck design, making them ideal for high-pressure and high-temperature applications. They are often required selections over threaded or slip on styles due to their superior integrity.

Leak Resistance
Raised face weld neck flange's precision welding ensures a tight seal, minimizing the risk of leaks and providing enhanced safety.

Reduced Stress Concentration
The smooth transition from the raised face weld neck flange to the pipe reduces stress concentration, preventing cracks and failures.

Alignment Accuracy
Raised face weld neck flanges facilitate precise alignment of pipes, resulting in better flow and reduced turbulence.

Enhanced Durability
Given their size/shape, raised face weld neck flanges typically have a longer lifespan due to their resistance to wear, corrosion, and erosion.

Reduced Maintenance
With fewer chances of leaks and failures, maintenance costs are lower than other flange types.

Improved Flow Characteristics
The smooth bore of raised face weld neck flanges reduces pressure drop and turbulence, enhancing fluid flow.

Easy to Align, Install, and Test
Raised face weld neck flanges can easily align to the pipe network in which it gets installed, resulting in a more robust weld. Also, the flange design makes it very accessible when inspecting the integrity of the weld via radiography testing.

Smooth Flow of the Liquid
Raised face weld neck flanges match the pipe's internal diameter, allowing a smooth, high-pressure liquid flow. Also, the design assures that there is little "turbulence" within the pipe, a common reason for erosion, leading to robust, more durable pressure vessel connections.

Strong and Reliable
Raised face weld neck flanges increase the pipe thickness from the weld all the way to the face of the flange. This design assures that the internally built stress by the flow of high-pressure liquid transfers to the pipe; it decreases the pressure on the flange itself.

Application of Raised Face Weld Neck

Construction & Maritime Ships
The fuel systems of ships and marine vessels use raised face weld neck flanges. By affixing the gasoline tubes together, they provide a safe passage of fuel from storage tanks to engines. Given the importance of fuel delivery for propulsion and power production in maritime operations, this is significant.

Power Generation Plants
Raised face weld neck flanges are widely used in thermal, nuclear, and renewable energy plants to create secure connections in crucial components. These consist of turbines, condensers, steam lines, and other parts. The flanges are also used to provide leak-free couplings and withstand the impact of high pressures and temperatures.

Food and Pharmaceutical Processing
Due to its corrosion resistance and simplicity of cleaning, raised face weld neck flanges are popular in applications for pharmaceutical and food processing. Additionally, they work well with powerful disinfectants and cleaners. Additionally, their clean surface finish reduces the buildup of debris and microorganisms, making sterilizing processes easier.

Chemical and Petrochemical Industries
High pressures, corrosive materials, and extremely high temperatures are routinely encountered in the chemical and petrochemical industries. The raised face weld neck flanges link pipes and valves that are used to refine and handle chemicals, oil, and gas. These difficult industrial applications are a good fit for them because of their sturdy design and ability to stop leaks.

Gas and Oil Industries
The raised face weld neck flanges on offshore platforms join the pipe networks that carry gas and oil from the seafloor to the surface. They can endure tough weather, powerful currents, caustic seawater, and other abrasive environmental conditions. They are also extensively utilized in onshore oil and gas industries' refineries and processing facilities.

How to Install Raised Face Weld Neck

Pre-Installation Inspection and Preparation
Before commencing installation, a comprehensive pre-installation assessment is imperative. It entails verifying if the flange's nominal pressure aligns with design specifications and scrutinizing its sealing surface for smoothness, cleanliness, absence of burrs, and radial grooves. Furthermore, non-destructive testing of weld neck flanges is essential to preserve their structural integrity and performance. Thorough cleaning using specialized tools and techniques is paramount to prevent surface damage.

Installation Methods and Considerations

Two distinct installation methods exist for raised face weld neck flanges, each accompanied by specific steps and considerations.
The first method entails meticulous preparation of stainless steel fittings' inner and outer sides before connecting weld neck flanges to the pipe. This involves subjecting the pipe's end to a 90-degree flaring treatment, followed by surface grinding to eliminate burrs, irregularities, and deformations, and finally, rounding using specialized tools.
Alternatively, the second method involves employing pre-made flanged short collars welded onto pipe material, accompanied by the insertion of O-ring and stainless steel sealing rings into flanges equipped with sealing grooves. Proper bolt tightening, ensuring symmetric connection of flange holes, is crucial in this method.
During installation, meticulous attention must be directed towards verifying the seal of each joint, in alignment with specified standards. Vigilance against potential loosening and slippage during usage is paramount to preempt pipeline leaks.

FAQ

Q: What is raised face flange?

A: Raised face is one kind of seal type of flanges, it means the gasket surface is higher than bolting circle face. This seal face is the most common used one not only among weld neck flanges. What's more, the height of raised face is changing based on the diameter of flanges. By the way, the seal face is on the opposite of the hub side.

Q: What is weld neck flange?

A: Weld neck flanges are a type of flange that has a neck that has the ability to move the location of the pipe tension. The flange can help to reduce the overall pressure that gathers at the bottom of the flange to help reduce it. This type of flange has a hub and a tapered neck that is going to be easy to spot and identify.
The neck of the flange is meant to help offer shielding for high-pressure situations as well as for large temperature shifts from high to low. The neck passes through the wall thickness directly from the pipe.

Q: What are different types of weld neck flanges?

A: Long Weld Neck Flange
The long welding neck flange is a variant of the conventional welding neck flange and is extended in size.
Its most popular applications are as a nozzle for columns and barrels, available in two distinct models: the Equal LWN Barrel and the LWN Heavy Barrel, which both have a sturdy wall structure and individual shapes.
Reducing Weld Neck Flange
This type of welding neck flange gets its title "reducing" due to its decreasing neck diameter designed to weld to reduced-sized pipes.
NW Long Weld Neck Flanges
This type of flange is known as a high-hub flange and is designed to transfer stress to the pipe while also reducing the stress concentration at the base of the flange.

Q: Can two raised face weld neck flanges be welded together?

A: Any butt-weld fitting or weld-neck flange can be directly welded to any other butt-weld fitting or weld neck flange without the need for any extra piece of pipe (Pup piece) between them.

Q: Are raised face weld neck flanges easy to install?

A: While welding requires skill and expertise, installing raised face weld neck flanges is straightforward if you've trained welders and the procedures are in place. The precision fit of the flange and pipe ensures alignment during welding.

Q: Are there any disadvantages of raised face weld neck flanges?

A: Raised face weld neck flanges have a few disadvantages when it comes to installation and maintenance, among other things:
Welding skill
Installing weld neck flanges is not easy; it requires specific skills like a more advanced welder. The smooth internal connection reduces the friction in the material flow.
Also, outside weld needs to match specific standards. Therefore, properly conditioned welding skills are crucial for installing these flanges, especially with ASME pressure vessel applications.
Leak occurrence
Along with installation techniques, experts must inspect each connection using a radiography test. Even though the connections pass the tests, sometimes there can be air pockets within the weld, which the test cannot detect.
Over time, these bubbles can develop leaks. The good news is that you can repair these leaks without replacing the whole flange.

Q: What are the features of raised face for raised face weld neck flanges?

A: The raised face is intended to decrease the surface area of the seal, thus concentrating the surface pressure applied when mating the flange. The result is a stronger seal.
The raised face has a machined serrated finish that will bite into the gasket whenever pressure is applied. Another option with a similar method of use is the flat face, sometimes called the full face, which has a machined face across the surface of the flange with serration going from the OD all the way to the ID of the flange.
These serrations then bite into the gasket just like they do with the raised face but, you have more surface area. The serrated face typically comes with either phonographic or concentric grooves.

Q: What are the functions of long weld neck flanges?

A: Large Pipe Networks
Industrial long weld neck flanges are the safest and best choice, whether it is a water main, gas main, or another large piping network. Large networks need high pressure to keep everything in the pipes moving. It results in the strain on smaller pipes and may end up damaging if not accounted for correctly, and this is where industrial long weld neck flanges help.
Office Complexes And Apartment Buildings
Like with any other large pipe network, high pressures are required to keep everything on the move. For that reason, you will commonly find long weld neck flanges that lead into these buildings.
Volatile Or Hazardous Fluids
Wild temperature swings from sub-zero to near-boiling and high pressures may wear on the pipes and fittings used to transport the fluid. Long weld neck flanges may help cut costs by reinforcing the pipes used in high-pressure, high-temperature situations.

Q: What are the advantages of raised face flanges?

A: Enhanced Sealing: Raised face flanges feature a raised surface that provides improved sealing capabilities, ensuring tighter seals between mating flanges.
Resistance to Deformation: The raised face design helps prevent deformation under high pressure, maintaining the integrity of the seal over time.
Easy Identification: The raised face serves as a visual indicator, making it easier to identify and align flanges during installation.
Compatibility: Raised face flanges are compatible with a wide range of gasket materials, offering flexibility in sealing options for different applications.
Durability: These flanges are known for their robust construction, providing reliable performance and longevity in piping systems.

Q: How to choose the right raised face weld neck flanges?

A: Factors to Consider
Selecting a raised face weld neck flange requires considering pressure ratings, temperature, pipeline size, and the nature of the materials being transported. Compliance with industry standards, like those set by the ANSI, ASTM, or ASME, is also a critical factor to weigh in.
Common Industry Standards
Understanding and adhering to common industry standards ensures compatibility and safety. Several standards specify dimensions, materials, and ratings, guiding users to find the appropriate flange for their system requirements.

Q: What is the difference between WNRF and SORF flanges?

A: WNRF stands for weld neck raised face flange, SORF stands for slip on raised face flange and SWRF stands for socket weld raised face flange each has to do with the mechanical joint as it relates to attaching each to the piping itself.
WNRF (WELD NECK RAISED FACE)
Welding Neck Flanges: are distinguished from other types by their long tapered hub and gentle transition of thickness in the region of the butt weld, joining them to the pipe. Flanges of this type are preferred for severe service conditions such as high pressure at sub zero or elevated temperatures, constant loading or where the temperatures fluctuate widely. Welding neck flanges are recommended especially for handling explosives, flammable or costly liquids or gases. These flanges cost considerably more than a slip-on.
SORF (SLIP ON RAISED FACE)
Slip-on Flanges: are preferred because of their lower initial cost, reduced accuracy required in cutting the pipe to exact length and much easy fit up. Final cost is probably about the same as weld neck type. The calculated strength under internal pressure is less than a weld neck and their life under fatigue conditions is far less than a weld neck. Slip-on flanges are limited to moderate services where major shocks or extreme pressure and temperature fluctuations will not be present.

Q: What are the characteristics of raised face weld neck flanges?

A: WNRF Flanges stands for Weld Neck Raised Face Flange. In WNRF flanges the gasket surfaces are raised above the bolting circle face. This helps to concentrate more pressure on a smaller gasket area and thus increase the pressure containment capability of the joint. WNRF Flanges are generally used in high pressure applications, where hot or cold temperatures exist. These steel WNRF Flanges are circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography. These WNRF Flanges reduce the turbulence and erosion inside the pipeline because the bores of both pipe and flange match. This also reduces high stress concentration at the base of the hub of the WNRF Pipe Flanges. Such WNRF Flanges are favoured in critical applications. The inside diameter of a WNRF Flanges is machined to match the inside diameter of the pipe.

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