TOBO STEEL GROUP CHINA
| Payment Terms | MoneyGram, MoneyGram, Western Union, T/T, D/A, L/C, D/P |
| Supply Ability | 10000Pcs/month |
| Delivery Time | 15-25days |
| Packaging Details | the wooden case |
| Product Name | Loose flange |
| Steel Grade | duplex stainless steel |
| Size | STD |
| Facing Flange | RAISED FACE |
| Packing | palletsor as the customers requirements |
| Section Shape | Round |
| Stress | 900# |
| Thickness | Sch40-sch160 |
| Standard | ASME, ANSI, DIN, JIS |
| Useage | Oil/Water |
| Shape | Round, Square, Rectangle, Oval, Etc. |
| Corrosion Resistance | High |
| Surface Treatment | cnc machined |
| Technics | Casting |
| Payment | T/T, L/C |
| Pressurerating | 150# to 2500# |
| Brand Name | TOBO |
| Model Number | Alloy Steel Flanges |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai, China |
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Product Specification
| Payment Terms | MoneyGram, MoneyGram, Western Union, T/T, D/A, L/C, D/P | Supply Ability | 10000Pcs/month |
| Delivery Time | 15-25days | Packaging Details | the wooden case |
| Product Name | Loose flange | Steel Grade | duplex stainless steel |
| Size | STD | Facing Flange | RAISED FACE |
| Packing | palletsor as the customers requirements | Section Shape | Round |
| Stress | 900# | Thickness | Sch40-sch160 |
| Standard | ASME, ANSI, DIN, JIS | Useage | Oil/Water |
| Shape | Round, Square, Rectangle, Oval, Etc. | Corrosion Resistance | High |
| Surface Treatment | cnc machined | Technics | Casting |
| Payment | T/T, L/C | Pressurerating | 150# to 2500# |
| Brand Name | TOBO | Model Number | Alloy Steel Flanges |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai, China |
| High Light | ASME B16.5 loose flange ，Class 150 alloy steel flange ，cost-effective loose flange | ||
Easy Alignment Cost Effective Loose flange ASMEB16.5 Class150
A Loose Flange, also known as a lap joint flange or loose flange, is not fixed directly to the pipe but is instead loose and slides over the pipe . It typically partners with a stub end (a welded collar or a lap ring), which is first welded or otherwise attached to the pipe. The loose flange then bolts this assembly to a mating flange, but it does not take the pressure load itself; its primary role is to facilitate connection and alignment .
This design offers several key advantages:
Material Savings: The flange itself can be made from a different, often less expensive material (like carbon steel) than the stub end, which can be a costly corrosion-resistant alloy like stainless steel, copper, or aluminum .
Ease of Alignment: Since the flange can rotate freely around the pipe, it is much easier to align bolt holes during installation, especially in tight spaces or with large-diameter pipes .
Ease of Maintenance and Inspection: It is well-suited for systems that require frequent disassembly for cleaning, inspection, or maintenance .
Suitability for Corrosive Media: By using a stub end made of corrosion-resistant material, the flange is ideal for pipelines carrying corrosive fluids .
The design and manufacturing of loose flanges are governed by various international and national standards. Key parameters include:
| Parameter | Details & Examples |
|---|---|
| Pressure Ratings (PN) | Common ratings for PN-marked flanges include PN2.5, PN6, PN10, PN16 , and can go up to PN40 or even higher for specific types. |
| Pressure Ratings (Class) | Common ratings for Class-marked flanges include Class 150, Class 300, Class 600 , up to Class 2500 . |
| Size Range (DN) | Available in a wide range of nominal diameters, from as small as DN 10 up to DN 2000 or larger. |
| Materials | Flange rings are commonly made from carbon steel (e.g., Q235, Q255) , stainless steel , and low-alloy steel. Stub ends can match the pipe material, including copper alloys and aluminum . |
| Common Standards | Key standards include GB/T 9118-2010 (for weld-neck loose flanges), GB/T 9121-2010 (for plate-collar loose flanges), and GB/T 9122-2010 (for lapped loose flanges) . Other standards like ASME B16.5 and DIN are also widely used . |
| Temperature Range | Varies by material and standard. For example, copper alloy loose flanges per GB/T 15530.5 are rated for temperatures up to 200°C , while CB/T 4212-2013 for Class A loose flanges allows up to 450°C . |
| Sealing Face Types | Common types include Raised Face (RF) , Male-Female Face (MF), Tongue-Groove Face (TG), and Ring-Type Joint (RJ) . |
Loose flanges are versatile components used across numerous industries, particularly where ease of assembly, maintenance, or corrosion resistance is important:
Corrosive Media Pipelines: They are highly suitable for transporting corrosive substances . The stub end in contact with the fluid can be made from corrosion-resistant materials like stainless steel, copper, or aluminum, while the flange itself can be made from carbon steel, offering a cost-effective solution .
Systems Requiring Frequent Disassembly: Ideal for pipelines and equipment that need regular inspection, cleaning, or maintenance, such as in food processing, pharmaceuticals, and chemical plants . Their rotatable design makes bolt alignment during re-assembly straightforward .
Non-Weldable Pipes: Used with pipes made of materials that are difficult to weld, such as plastic pipes or glass reinforced plastic (GRP) pipes, where the stub end provides a reliable connection point .
Broad Industrial Use: They are widely applied in:
Shipbuilding: Used in various shipboard systems .
Petrochemical and Oil Refining: For various process and utility lines .
Power Generation: In systems requiring isolation for maintenance .
Water Treatment and Public Utilities: For water supply and wastewater management .
Construction, HVAC, and Plumbing: For water, heating, and ventilation systems .
I hope this structured overview helps you understand loose flanges better. Should you have more specific questions regarding a particular standard, material, or application scenario, feel free to ask.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
3,000,000-10,000,000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia...
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