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Flanges

Why Choose Us

Factory Strength

Shanghai KEK Pipeline Technology Co., Ltd. is a reputable AAA listed pipe fittings manufacturer in China, covering an area of 66666㎡ (80000+㎡ in Phase II), with more than 30 technicians and engineers.

Our Certifications

KEK has obtained ISO9001, ISO14001, ISO18001, CE/PED, API certification and TS pressure pipe component special equipment manufacturing license, as well as Russia's EAC continuous certification.

Advanced Equipment

It has a full set of the largest and most advanced equipment in China, including a 4000-ton hydraulic press and a 3000-ton three-way cold extrusion molding machine.

Product Traceability

Product traceability, all products are numbered and indexed by furnace number, production process number, and RT inspection number to ensure the unique traceability of the product.

 

What is a Flange ?

 

A flange is a connecting element commonly used to join pipes or pipe components together or to secure equipment to a surface. Flanges can typically be round or square and are used in various industrial applications.A flange has two main components: a flange face and flange connection holes. The flange face is mounted onto the surface of the pipe or equipment to be connected. This surface usually has a flat or slightly raised gasket.Flange connection holes, along with other flanges or connecting elements, are used to connect flanges or to another surface. These holes are typically arranged in a circular pattern and are tightened with bolts or nuts.

 
 
Benefits of Flanges
01.

Versatility

Pipe flanges offer a versatile approach to connecting different elements of a pipe system. Their adaptability makes them right for a wide range of industries and applications.

02.

Easy to Install

Depending on the type, pipe flanges are simple to install and remove, making periodic maintenance and inspections more convenient. This feature is extremely valuable in economic sectors where downtime is costly.

03.

Reliability

The design of pipe flanges ensures a reliable and durable connection between pipes and other components. This reliability is essential in applications where safety and efficiency are paramount.

04.

Customization

Pipe flanges come in various materials, sizes, and pressure ratings, allowing customization based on specific project requirements. This flexibility contributes to their widespread use across diverse industries.

 

 
Types of Flanges
 
01/

Threaded flanges
Also known as a screwed flange, this style has a thread inside the flange bore which fits with the matching male thread on the pipe or fitting. The threaded connection means you can avoid welding in many use cases. Simply match the threading to the pipes you wish to connect.

02/

Socket-weld flanges
Ideal for smaller pipe diameters in low-temperature and low-pressure scenarios, socket-weld flanges feature a connection in which you place the pipe into the flange and then secure the connection with a single multi-pass fillet weld. This makes this style simpler to install than other welded flange types while avoiding the limitations associated with threaded ends.

03/

Slip-on flanges
Slip-on flanges are very common and are available in a large range of sizes to accommodate systems with higher flow rates and throughput. Simply match the flange to the outer diameter of the pipe you intend to connect. Installation is slightly more technical as you’ll need fillet weld both sides to secure the flange to the pipe.

04/

Lap joint flanges
Featuring a two-piece design, lap joint flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection. This design makes this style popular for use in systems with limited physical space or systems which require frequent dismantling and maintenance.

05/

Weld neck flanges
Like lap joint flanges, weld neck flanges require butt welding for installation. However, their integrity, performance in systems with multiple repeat bends, and the ability to use them in high-pressure and high-temperature systems make them a leading choice for process piping.

06/

Blind flanges
Used for terminating or isolating piping systems, blind flanges are essentially boltable blank discs. When installed properly and combined with the correct gaskets, they can achieve an outstanding seal which is easy to remove when needed.

Application of Flanges

Petrochemical Industry
Flanges are used at the joints of pipelines in refineries, chemical plants, and petrochemical facilities. Flanges provide secure connections in systems operating at high pressures and temperatures.

 

Power Generation
Flanges play an important role in power generation facilities such as power plants, nuclear plants, hydroelectric plants, and thermal plants. They are used at the joints of pipelines, pumps, turbines, and other equipment to ensure secure and durable connections.

Marine Industry

In the shipbuilding and marine industry, flanges are used between pipelines, cooling systems, fuel systems, and other marine equipment. This ensures the safe and effective integration of ship operating systems.

Water and Wastewater Treatment

Flanges are widely used in water treatment plants, wastewater treatment plants, and sewer systems. Flanges are used to establish connections between pipelines, pumps, valves, and other equipment.

Construction and Manufacturing

Flanges are used in the construction of industrial facilities and manufacturing processes. They provide secure connections at the joints of pipelines, air ducts, equipment, and structural components.

 

Flange Material

Carbon steel
Carbon steel is steel alloyed primarily with carbon. It has a high hardness and strength which increases with carbon content, but lowers ductility and melting point. For more information on carbon and alloy steels, please visit the Carbon Steels and Alloy Steels area on Engineering360.

 

Alloy steel
Alloy steel is steel alloyed with one or more elements which enhance or change the steel's properties. Common alloys include manganese, vanadium, nickel, molybdenum, and chromium. Alloy steels are differentiated based on standard grades. For specific information on individual types of alloying elements, please visit the Metals and Alloys section on Engineering360.

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Stainless steel

Stainless steel is steel alloyed with chromium in amounts above 10%. Chromium enables stainless steel to have a much higher corrosion resistance than carbon steel, which rusts readily from air and moisture exposure. This makes stainless steel better suited for corrosive applications that also require high strength.

Cast iron

Cast iron is iron alloyed with carbon, silicon, and a number of other alloyants. Silicon forces carbon out of the iron, forming a black graphite layer on the exterior of the metal. Cast irons have good fluidity, castability, machinability, and wear resistance but tend to be somewhat brittle with low melting points. For more information on cast irons, please visit the Cast Irons area on Engineering360.

Aluminum

Aluminum is a malleable, ductile, low density metal with medium strength. It has better corrosion resistance than typical carbon and alloy steels. It is most useful in constructing flanges requiring both strength and low weight. For more information on aluminum, please visit the Aluminum and Aluminum Alloys area on Engineering360.

Brass

Brass is an alloy of copper and zinc, often with additional elements such as lead or tin. It is characterized by good strength, excellent high temperature ductility,reasonable cold ductility, good conductivity, excellent corrosion resistance, and good bearing properties. For more information on brass and other copper alloys, please visit the Copper, Brass, and Bronze Alloys area on Engineering360.

 

How to Choose Flanges
 

Types
It is often easy to spot the flange type by the way it looks. First, you must classify the top of the flange by deciding whether the flange has a socket weld, flat flange, lap joint, threaded bore, welded neck, groove, and tongue flange. Next, the bottoms are identified with the evaluation of whether they have a flat face, which is entirely flat, or a raised face which is a slightly raised section on the face of the flange.

 

Size
The flange size consists of factors that include the standard used (: JIS-Japanese International Standard, ANSI-American National Standards Institute, and DIN – Deutsches Institut für Normung / European), the pressure level needed, and the actual overall outside diameter and thickness of the flange. Other factors in determining the full call-out include the number of bolt holes, outer diameter, inner diameter, bolt circle, and bolt hole diameter, but the nominal pipe size is typically universal.

 

Thickness
Depending on the flange thickness, it can be determined how high a pressure flange can handle, in any applicationthicker flanges can resist high pressures.

 

Bolt holes
Bolt holes help to measure the flange size and pressure class. The actual size of the bolt holes, the pitch circle diameter, and the number of bolt holes on the flange are three factors that need to be addressed. If the bolt is stronger and thicker, it can often correlate with higher pressure capabilities.

 

Standards
There are a lot of industry-defined standards from which you can choose the flanges. So the flanges help to choose based on the standard and application of the product. You can connect it to the three primary standards previously mentioned, including DIN, ANSI, and JIS.

 

Pressure class
Pressure class signifies the marginal pressure level under which the flange can safely function and sustain. Each standard comes with several pressure levels available, from high-pressure to low-pressure tolerance. The pressure levels of products connected to the flanges must be the same as those of valves and pipes in service. The most common industry pressure class is the modern ASME 150# per B16 spec.

 

Materials
It is crucial to choose a suitable material for a flange depending on the understanding and application the elements will encounter in an application that the piping system is using. The most common materials include chrome, nickel, carbon steel, duplex steel, stainless steel, etc.

Alloy Steel Weld Neck Flange

Process of Flanges

Material Selection
Picking the right flange materials is the first stage in the machining process. The most popular materials for making flanges are alloy steel, carbon steel, or stainless steel. However, the ideal material often depends on the application’s temperature, pressure, and corrosion resistance needs.

 

Material Cutting and Shaping
Following selection, the material is sliced and formed. Big metal plates are cut into smaller pieces to get the right size for the flange. The produced parts are then heated to the proper temperature to prepare them for further processing.

Heat Treatment

Depending on the material and purpose of a flange, the flanges may undergo heat treatment methods such as annealing, quenching, or tempering. Heat treatment boosts the flange’s mechanical properties while enhancing its resilience, toughness, and resistance to wear and corrosion.

Forming and Forging

The heating process makes the metal components malleable, facilitating the proper flange shape development. Machinists utilize different methods to forge the flange, including hot forging and cold forging. The metal is formed at room temperature in cold forging, while hot forging involves forming heated material/metal under high pressure.

Machining

After the initial cutting and shaping, the flange is machined to achieve precise tolerances and to refine its dimensions. This operation includes facing sealing surfaces, chamfering edges, and drilling holes for bolt connections. CNC (Computer Numerical Control) machines are often used for automated and precision machining.

Surface Finish

Flanges might undergo surface finishing operations like grinding or polishing to achieve the desired smoothness, remove surface defects, and improve their overall look.

 

How to Maintain Flanges

 

1. Check flange sealing performance

Checking flange sealing performance is one of the critical routine maintenance activities for pipe flanges. Ensuring that the flange sealing capability is intact can prevent leaks, which can cause significant damage to industrial systems. There are several things to consider when checking flange sealing performance.Firstly, it is essential to check the condition of sealing gaskets and fillers. Over time, these components can wear out or become damaged, affecting the sealing performance of the flange. By inspecting the condition of these components regularly, you can replace them before they fail and cause leaks.

2. Clean flanges

Cleaning flanges is another essential routine maintenance activity for pipe systems. Clean flange surfaces are critical to maintaining sealing performance and reducing corrosion, both of which directly affect the overall integrity of the system. There are several things to consider when cleaning flanges.Firstly, it is essential to ensure that the appropriate cleaning agents and tools are used. The choice of cleaning agents and tools can vary depending on the type of flange material and the nature of the dirt or debris. Using the wrong cleaning agent or tool can cause damage to the flange surface, affecting its sealing capabilities and integrity.

3. Proper installation/removal of flanges

Proper installation and removal of flanges is essential for maintaining the flange system’s integrity, reducing the risk of damage and leaks while ensuring personnel safety. There are several things to consider when installing and removing flanges.Firstly, it is crucial to follow proper procedures when installing and removing flanges. These procedures may vary depending on the type of system and the nature of the flanges. By following the correct procedures, you can reduce the risk of equipment damage or personnel injury that can occur during installation or removal.

4. Solving corrosion and other issues

Solving corrosion and addressing other issues affecting flanges is an essential routine maintenance activity. Corrosion and other issues can impact flange performance and integrity, leading to leaks and even system failures. There are several things to consider when solving corrosion and addressing other issues.Firstly, it is important to check for corrosion and other issues affecting flanges regularly. This can be done through visual inspection or using non-destructive testing techniques. By identifying these issues early, you can take appropriate corrective actions that prevent further corrosion or damage.

 

Our Factory

Shanghai KAIKE Pipe Technology Co., Ltd. is a reputable AAA listed pipe fittings manufacturer in China,covering an area of 66666㎡ (80000+ ㎡in stage II) and with technician and engineers more than 30 personal. Kaike Group is made up of Shanghai Kaike Piping Technology, Shanghai Kaike Valve manufacture and one export company Shanghai Chainmill Industry, they are all based in Shanghai, which the economic center of China. KAIKE has reached up to an annual output of pipe fittings of 20,000 tons.KAIKE has the ability to produce by various materials like carbon (low temperature) steel, stainless steel, duplex steel, alloy steel, nickel base alloy and special materials as requested according to GB, SH, Hg, JB, SY, ASME/ANSI, MSS, JIS, DIN, BS,GOST etc.Its main products include BW pipe fittings(SMLS or welded), steel flange, forged pipe fittings as well as prefabricated spools and manifolds,and also can produce according to customers' drawings and requirements.

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FAQ
 

Q: What are the parts of a flange?

A: Flanges are split into two main areas, the 'blade', and the 'hub'. The flange blade encompasses the area where the bolts penetrate through the flange and the flange face. The flange hub is the area that accommodates the pipe which attaches to the flange.Flanges are indispensable components in integrating pipes, valves, and machinery across diverse industrial applications.

Q: What is the structure of a flange?

A: Typically, a flange is a forged or thrown ring of stainless steel that is welded or screwed to another component in the system. To create a flanged joint in a pipe system, two connecting pieces with flanges at the end are bolted together, with a seal provided by a gasket between them.

Q: What goes in between flanges?

A: A malleable gasket that could be hard or soft is inserted between the flanges to prevent leaks. Pressure is applied to the gasket by bolting or using a clamp to compress the gasket firmly at a place. The gaskets are made with different materials and can be selected per the process's temperature and characteristics.

Q: What are the main parts in flange coupling?

A: This type of coupling involves two flanges, each attached to the shaft ends, and the flanges are bolted together to create a rigid connection. This allows for easy assembly and disassembly. Safety measures are implemented to shield the protruding bolts and nuts.

Q: What are the joints between flanges?

A: There are two methods to connect the flange: one is the threaded joint flange and the other is the welded flange. The relief line belongs to the high-pressure, large-diameter pipeline; as a result, it should use the welded flange instead of the screw joint flange (Figs.

Q: What are the two main standards of flanges?

A: The flanges are used to connect ducts, pipes or equipment and come in different sizes and shapes. In this article, we look at flanges in the ASTM and DIN standards, which are the most common standards.There are three common types of flange face, the plain/flat, raised, and ring-type joint (RTJ). Other types of flange face exist, primarily the Tongue-and-Groove (T&G), Lap Joint, and Male-and-Female (M&F) designs, but these are less popular.

Q: What is part of wide flange?

A: Upper and lower horizontal part of the beam is called flange, the connecting vertical middle part is called web. Wide flanged stainless steel beams are used in commerce and industry but also in machinery and equipment building.Advantages of using a Carbon Steel Male & Female Flange include - Better sealing properties, more precise location. Another advantage of using the male and female flange face is its exact compression of sealing material, with utilization of other, perhaps more suitable sealing and specialized sealing material.

Q: What are flanges used for?

A: The main use of flange is to connect pumps, pipes, valves, and other equipment to make a pipework system. Usually, flanges are threaded or welded, and you can connect two flanges by bolting them with gaskets and providing a seal that gives easy access to the piping system.A flange is a mechanical device used to connect pipes, valves, pumps, and other equipment to form a pipeline system. Flanges provide a means of attaching and sealing two pieces of equipment together, allowing for easy maintenance and disassembly.

Q: What is a flange on the body?

A: Flange. An adhesive plate to secure an ostomy pouch to the body. Some flanges come attached to the pouch as a one-piece system. Other pouches can be removed from the flange on the body as part of a twopiece system.

Q: What is the most commonly used flange?

A: The Weld Neck flange is the most commonly requested flange. It features a neck extension with a tapered hub, a 37.5-degree bevel, and a 1/16” landing at the point of the weld. This will butt directly onto another pipe with a similar level, where it will be welded together with a 75-degree weld.

Q: What is a flange on a bed?

A: A strip of fabric added to the pillow edge. A flange increases the overall dimension of the pillow and it can be made with either the same or a contrasting fabric. Ex. If the pillow was originally 18 x 18" and the strip of fabric is 2" wide, with flange the pillow would be 20 x 20".It is a structural angle or channel that is welded to the end of the ducting facilitate bolting or welding the expansion joint into the system.

Q: What is an example of a flange?

A: A weld neck flange is a type of flange that is mounted on the outer circumference of the pipe or equipment at the joint and can be welded. It is designed to provide a stronger and more durable connection and is used in high-pressure and high-temperature applications.

Q: Do you need a flange?

A: Without a flange, a toilet cannot be secured properly. Theoretically, you could bolt a toilet straight to the floor, but this would lead to rotting floors and sewer leaks. Without the flange it is very hard to line up the toilet with the drainpipe. The toilet flange is essential for a modern bathroom.

Q: What is a blind flange?

A: A blind flange is a solid disk used to block off a pipeline or to create a stop. Similar to a regular flange, a blind flange has mounting holes around the perimeter and the gasket sealing rings are machined into the mating surface. The difference is that a blind flange has no opening for fluids to pass through.

Q: What is a flange face?

A: The flange face is the surface area that receives the gaskets. The material of the gasket seats over the flange face and creates an effective sealing under pressure. The flange face is designed per the ASME B16. 5 for flanges up to 24 inches and ASME B16. 47 for 26-inch flanges and larger.

Q: What is a pillow flange?

A: What is a flange edge on a pillow? A flange edge is a classic fabric decorative accent, added along on all four sides of a pillow sham or throw pillow. A flange consists of fabric with a seam allowance ranging from 1/2" to 3" beyond the dimensions of the sham.

Q: Do I need a flange?

A: Flanges are crucial in ensuring longevity of life and quiet running for the pump. Having an aerated supply of water to a pump, showers and other outlets can lead to an increased risk of: Unnecessary, and perhaps sudden, fluctuations in temperature.

Q: How do you stop a flange from leaking?

A: To fix this issue, it is crucial to follow proper installation procedures. This includes ensuring that the flange faces are parallel and in contact with each other, using the appropriate gasket material, tightening the bolts in the correct sequence and torque, and applying a suitable sealant or lubricant.

Q: What causes a flange leak?

A: Common causes are inadequate piping flexibility, using cold spring to align flanges, and improper location of supports or restraints. Thermal Shock. Rapid temperature fluctuations can cause flanges to deform temporarily. This is typically a greater potential problem in high temperature applications.

Q: How often should you change your flanges?

A: Every six months
Flanges and backflow protectors should be replaced every six months, or at the first sign of cracking or malformation. All silicone breast pump parts (membranes, duckbill valves, etc) should be replaced every 2 months, or at the first sign or tearing or other damages.

We're professional flanges manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale high-grade flanges at low price from our factory. Contact us for cheap products.

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