Welded flange
Welded flanges are essential components in piping systems, providing reliable connections between pipes, valves, pumps and other equipment. Our high-quality welded flanges meet strict industry standards and are designed for optimal performance in various industrial applications.
Product Specifications
- Material: Carbon steel, stainless steel, alloy steel
- Standards: ANSI B16.5, ASME B16.47, DIN, JIS, BS
- Pressure Ratings: Class 150 to Class 2500
- Sizes: 1/2" to 60" (DN15 to DN1500)
- Surface Treatment: Anti-rust oil, galvanized, painted
- Certifications: ISO 9001, API, PED
Technical Parameters
| Type | Size Range | Pressure Class | Material Grade | Temperature Range |
|---|---|---|---|---|
| Weld Neck Flange | 1/2"-60" | 150#-2500# | A105, A350 LF2, 304/316 | -29°C to 425°C |
| Slip On Flange | 1/2"-24" | 150#-2500# | A105, A350 LF2, 304/316 | -29°C to 425°C |
| Socket Weld Flange | 1/2"-4" | 150#-2500# | A105, A350 LF2, 304/316 | -29°C to 425°C |
Welded Flange FAQ
What is a welded flange and how does it work?
A welded flange is a pipe fitting that connects to pipes through welding. It creates a secure, leak-proof joint by being welded around the pipe circumference. Welded flanges typically feature raised faces that mate with gaskets to form tight seals when bolted to other flanges or equipment. They're commonly used in high-pressure systems where reliability is critical.
What are the advantages of using welded flanges over other connection methods?
Welded flanges offer several key advantages: superior strength and leak resistance for high-pressure applications, better alignment during installation, reduced maintenance needs, and longer service life compared to threaded or grooved connections. The welded joint provides structural integrity that prevents loosening under vibration or thermal cycling, making welded flanges ideal for critical service conditions.
Dimensional Specifications
| Nominal Pipe Size | Outside Diameter | Bolt Circle Diameter | Number of Bolts | Bolt Size | Thickness |
|---|---|---|---|---|---|
| 1/2" | 3.50" | 2.38" | 4 | 1/2" | 0.44" |
| 1" | 4.25" | 3.12" | 4 | 1/2" | 0.56" |
| 2" | 6.00" | 4.75" | 4 | 5/8" | 0.69" |
How do I select the right welded flange for my application?
Selecting the proper welded flange requires considering several factors: the pipe material and size, system pressure and temperature requirements, media being transported, and environmental conditions. Match the flange material to your pipe material, choose the appropriate pressure class (typically matching your piping system rating), and select the right facing type (raised face, flat face, or ring-type joint) based on your gasket requirements. Always consult relevant standards (ASME, ANSI, etc.) and consider corrosion resistance needs when choosing materials.
Installation Guidelines
- Ensure proper alignment before welding
- Clean all mating surfaces thoroughly
- Use appropriate welding procedures and qualified welders
- Allow proper cooling time after welding
- Inspect welds for defects before pressure testing
- Tighten bolts in a star pattern to ensure even gasket compression
Maintenance Tips
- Regularly inspect for signs of corrosion or leakage
- Check bolt torque annually or as needed
- Replace gaskets during system maintenance
- Address any surface pitting or erosion promptly
- Protect flanges from impact damage
Quality Assurance
Our welded flanges undergo rigorous quality control including:
- Material traceability with Mill Test Certificates
- Dimensional verification at multiple production stages
- Non-destructive testing (RT, UT, MT, PT) as required
- Pressure testing to verify leak-tight performance
- Surface finish inspection
Applications
Welded flanges are widely used in:
- Oil and gas pipelines
- Chemical processing plants
- Power generation facilities
- Water treatment systems
- HVAC systems
- Shipbuilding and marine applications
With decades of experience in manufacturing welded flanges, we guarantee products that meet the highest industry standards for safety, reliability, and performance. Our technical team can assist with custom requirements and application-specific solutions.