Introduction
Flanges Are the Main Components for Connecting Pipes, Valves, And Pumps. This Article Will Introduce You to the Types of Flanges in Detail, So That You Can Have a Full Understanding of the Flanges When Purchasing.They Are Often Used in Combination with Bolts, Nuts, And Gaskets. They Are Mainly in the Form of Discs. BalingSteel Is a World-Renowned Flange Supplier and Can Provide You with Different Types of Options. Our Flanges Have the Following Advantages:
- Quick Connection: Enables Quick Repair and Replacement of Pipelines
- Excellent Sealing: Used with Gaskets, Has Excellent Sealing and High Pressure Resistance
Common Flange Types
The Following Are the Most Commonly Used Flange Types:
| Flange Type | Structural Features | Sealing Performance | Applicable Pressure |
| Blind Flange (BL) | No bore, completely blocks pipeline end | Very High | High pressure, high temperature |
| Slip-On Flange (SO) | Welded, with bore | Medium | Low to medium pressure |
| Weld Neck Flange (WN) | With neck, requires welding | High | High pressure, high temperature |
| Lap Joint Flange (LJ) | Used for lined pipes | Low | Low pressure |
Flange by Connection Method
Welded Flange
According to the Product Name, This Type of Flange Needs to Be Welded to Pipes and Components. It Generally Has a Longer Welding Nozzle and Is Used in High Pressure and High Temperature Environments.
Butt Welded Flange,BWF
This Type of Flange Has a Long Tapered Neck. This Design Can Evenly Withstand the Pressure in the Pipeline and Is the Most Commonly Used Flange Type in Oil and Gas Pipelines.
Flat-Face Flange,FFF
The Flange Port Is Flat-Face, Which Is an Intermediate Choice Between Socket-Weld Flange and Butt-Weld Flange. It Can Be Used for Large-Diameter Pipes, But Can Only Be Used in Medium and Low Pressure Environments. It Is the Most Consumed Type in the Pipeline System.
Threaded Flange,TF
The Flange Has Threads Inside, Which Can Be Connected to the Pipe End Through Threads. It Is Widely Used in Water Delivery Projects, But Is Not Suitable for High Temperature and High Pressure Environments.
Lap Joint Flange,LJF
It Is Composed of a Stub End and a Loose Flange, Which Can Be Flexibly Connected Through Nuts and Is Quick to Install and Disassemble. The Doubled Nipple Is Cap-Mounted. It Is Usually Made of Special Materials and Used in Special Environments. The Doubled Nipple Is Usually Made of Duplex Stainless Steel, Titanium Alloy, Etc., And the Loose Flange Is Made of Ordinary Carbon Steel. This Combined Connection Method Can Greatly Save Costs.
Loose Flange,LF
It Is the Best Partner for the Stub End, Which Can Be Flexibly Rotated Through the Bolts to Connect the Pipe Ends, Facilitating Frequent Use and Maintenance of the Pipeline.
Socket Welded Flange,SWF
It Is a Small-Diameter High-Pressure Flange with an Independent Inner Hole for Connecting the Pipe, And Then Welding the Pipe After Butt Joint. It Has a Higher Overall Welding Consistency, But It Is Only Suitable for Small-Diameter Flanges.
Flange by Sealing Surface
Raised Face Flange,RFF
The Flange Surface Is Raised and Is the Most Commonly Used Flange Type.
Slip On Flange,SOF
It Is the Most Common and Affordable Flange Type. Balingsteel Has a Large Stock of Regular Sizes.
Flat Flange,FF
Also Called FF Flange, According to the Product Information, The Flange Surface Is Flat. Mainly Used in Low Pressure Environment.
Male and Female Face Flange, MFMF
Two Flanges, One with a Concave Surface and One with a Convex Surface. They Are Welded to the Two Ends of the Pipe to Be Connected and Can Fit Together Perfectly. Mainly Used in Medium and Low Pressure Pipelines.
Tongue and Groove Flange, TGF
One Side Has a Tongue (Tongue) and the Other Side Has a Groove (Groove). It Needs to Be Used Together. It Is an Upgraded Version of the Concave and Convex Flange. The Principle Is the Same, But the Performance Is Better. It Is Mainly Used in High-Temperature and High-Pressure Pipelines. It Has High Requirements for Pipeline Construction Accuracy.
Ring Type Joint Flange, RTJF
Flange Sealing Surface with Annular Groove, Need to Be Used with Gasket, Is the Most Common Means of High Pressure Pipe Connection on the Market. Balin Steel Has a Large Number of Standard Size Stocks for You to Choose.
Flanges by Application
Blind Flange,BLF
Blind Flange Is a Pipe Fitting Used to Seal the Pipe, And Its Shape Is Similar to a Round Steel Plate.
Neck Welding Flange,WNF
Neck Welding Flange Is a Fitting Used to Connect Pipes. It Has a Long Nozzle, Which Is Convenient for Butt Welding and Welding of Pipes.
Special Purpose Flange
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Octagonal&Spectacle Blind Flange
Spectacle Blind Flange Is Designed to Be Used for Sealing Pipelines in Special Environments to Prevent Leakage of Gas and Liquid.
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Swivel Flange
Swivel Flange Is a Rotatable Flange, Which Is Mainly Used in Submarine Pipeline Systems to Facilitate Submarine Maintenance Personnel to Connect Marine Pipelines. BalingSteel Is the Largest Submarine Pipeline Accessories Supplier in China Except Oil States International and Oceaneering in the World
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Ball Flange
And Swivel Flange Are Used with Submarine Pipelines to Adjust the Angle of Submarine Pipelines and Facilitate the Connection of Pipelines to Form a Closed Loop.
Flange by Industry Standards
Balingsteel Can Produce Flanges of Different Standards for You, Such as American Standard Flanges, European Standard Flanges, National Standard Flanges, API Flanges, JIS Flanges, Etc. They Have the Following Characteristics:
| Flange Type | Standard | Pressure Rating |
| ANSI/ASME Flange | ANSI B16.5, ASME B16.47 | Class 150, 300, 600, 900, 1500, 2500 |
| DIN/EN Flange | EN 1092-1, DIN 2630-2638 | PN6, PN10, PN16, PN25, PN40 |
| GB/T Flange | GB/T 9112-9113 | Class 150, 300, 600, PN10, PN16 |
| API Flange | API 6A, API 5L | API 2, 3, 4, 5, 6, 7,2000PSI,3000PSI,5000PSI,10000PSI,15000PSI,20000PSI, |
| JIS Flange | JIS B2220 | JIS 5K, 10K, 20K, 30K, 40K |
Conclusion
We First Need to Confirm the Purpose of the Flange to Decide the Type of Flange, Such as Blind Flange, Welding Flange or Swivel Flange, Etc.; the Second Is to Choose the Material and Pressure Level of the Flange; Finally, According to the Connection Method and On-Site Conditions, Choose the Corresponding Flange Surface Type Such as FF Surface, RF Surface, RTJ Surface, Etc.; Finally, We Can Confirm the Required Flange Type. If You Have Any Questions About the Type of Flange, Please Feel Free to Contact Us for Assistance, Of Course, We Will Also Provide You with the Most Affordable Price.
FAQ
What Types of Gaskets Are There for Blind Flanges?
There Are Octagonal Spacers and Oval Spacers for You to Choose.
What Is the Relationship Between Flange Price, Weight and Size?
Theoretically, The Larger the Flange Size and Weight, The More Expensive It Is. If You Need to Know the Detailed Flange Weight and Price, Please Contact Us for Further Information.
What Is a WN RF Flange?
Welded Neck Flanges Are Mainly Used for Connection,RF Is the Flange Surface Type, Which Is a Raised Face and Are Frequently Used Flanges. They Have Excellent Pressure Resistance and High Pressure Resistance.
