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| Customization: | Available |
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| Standard: | ANSI, DIN, GB, JIS, GOST, BSW |
| Type: | Welding Flange |
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| Types | Weld Neck Flanges | Slip-On Flanges | Blind Flanges | Socket Weld Flanges |
| Material | Carbon Steel Flange | Stainless Steel Flanges | Alloy Steel Flanges | Special Alloys |
| Surface | Raised Face | Flat Face | Ring-Type Joint |
Pipe flanges are integral mechanical components designed to connect sections of pipes, valves, pumps, and other equipment within a pipeline system. They form a secure, leak-proof seal while allowing for easy assembly and disassembly. This makes them essential for applications requiring routine maintenance, inspection, cleaning, or system modifications.
Steel and alloy flanges are particularly valued in demanding industrial settings due to their exceptional mechanical strength, durability, and ability to perform reliably under high pressure, high temperature, and corrosive conditions. Their robust construction ensures long-term system integrity and safety.
Different flange types are available to suit specific functional and installation requirements:
Weld Neck Flanges (WN):
These feature a long tapered hub that is butt-welded to the pipe, providing excellent structural integrity and stress distribution. Ideal for high-pressure and high-temperature applications.
Slip-On Flanges (SO):
Designed to slide over the pipe and then be welded both internally and externally. They are easier to align than weld neck flanges and are suitable for lower-pressure services.
Blind Flanges (BL):
Used to seal the end of a piping system or vessel opening. They allow easy access for future expansion or inspection and are often employed in pressure testing.
Socket Weld Flanges (SW):
Similar to slip-on flanges, but with a socket for inserting the pipe before fillet welding. They are used for smaller-diameter, high-pressure piping.
Lap Joint Flanges (LJ):
Used with stub ends, allowing easy alignment and disassembly of systems requiring frequent maintenance. Suitable for low-pressure, non-critical applications.
Threaded Flanges:
These have internal threads and screw onto pipes without welding, making them suitable for low-pressure applications where welding is not feasible.
Flanges serve several vital functions:
Connectivity:
Enable efficient and secure joining of pipes and other components, facilitating complex pipeline layouts.
Flexibility and Maintenance:
Allow quick disassembly for cleaning, inspection, or repairs, reducing downtime and operational costs.
System Adaptation:
Simplify modifications and expansions of existing pipeline networks by enabling the integration of new components.
Sealing Performance:
When combined with gaskets and properly tightened bolts, flanges ensure a reliable, leak-free seal even under extreme conditions.
The choice of material depends on operational requirements:
Carbon Steel Flanges:
Offer good strength and are cost-effective for general-purpose applications in non-corrosive environments. Examples include ASTM A105 (forged) and A234 WPB (fabricated).
Stainless Steel Flanges:
Provide superior corrosion resistance and are suitable for chemical, food processing, and marine applications. Common grades include 304/304L and 316/316L.
Alloy Steel Flanges:
Designed for high-temperature and high-pressure services, such as in power plants and petrochemical industries. Examples include ASTM A182 F11, F22, and F91.
Special Alloys:
Materials like duplex stainless steel, incoloy, and hastelloy are used in highly corrosive or extreme environments.
The flange facing plays a critical role in sealing efficiency. Common types include:
Raised Face (RF):
A small raised surface around the bore helps concentrate pressure on the gasket, improving the seal.
Flat Face (FF):
The entire surface is flat, often used with cast iron or low-pressure applications.
Ring-Type Joint (RTJ):
Features a grooved surface for a metal ring gasket, ensuring a tight seal in high-pressure and high-temperature systems.
Flanges are manufactured in accordance with international standards to ensure compatibility and safety. Key standards include:
ASME B16.5:
Covers pipe flanges and flanged fittings for sizes NPS ½" to 24".
ASME B16.47:
Governs large-diameter flanges for sizes NPS 26" to 60".
EN 1092-1:
European standard for flanges and their joints.
MSS SP-44:
Standard for steel pipeline flanges.
Dimensional standards (e.g., ANSI, DIN, JIS) and pressure ratings (e.g., Class 150, 300, 600, 900, 1500, 2500) must be carefully matched to system requirements.
Steel and alloy flanges are widely used in numerous sectors, including:
Oil and gas production and refining
Chemical and petrochemical processing
Power generation (thermal, nuclear, and renewable)
Water and wastewater treatment
Shipbuilding and marine engineering
Pharmaceutical and food processing
Q: How many days can you deliver after confirmed the order?
A: For stock: within 5-7 days;
For customized product: around 30 days;
For special sizes: subject to negotiation.
Q: How does your company do quality control?
A: ISO 9001:2015 certified;
Product certificate as per EN10204 3.1 or 3.2 as per customer's request.
Q: Can I have a factory-visit?
A: Surely. All customers are welcome to visit us in China.
Q: Can I have a trial order?
A: Of course, it is an honor for us to have the opportunity to show our quality and service.
Q: What's the price of your product?
A: Our prices are based on the material grade, size, quantity and physical performance etc. So if you can offer us the detailed information, then we can give you the best reasonable price. Also, we can do special size and color for customers.
Q: Why do you think I will want to buy from you?
A: We have advantages with 25 years of professional experiences in manufacturing & designing, advanced technology & the first-class equipment, perfect logistics management, high-quality after-sales service and competitive price.
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