High-Quality Welded Flanges for Industrial Applications
Welded flanges are essential components in piping systems, providing reliable connections between pipes, valves, pumps and other equipment. Our industrial-grade welded flanges meet the highest quality standards for various applications in oil & gas, chemical processing, power generation and water treatment industries.
Key Specifications of Our Welded Flanges
- Material Grades: Carbon Steel, Stainless Steel (304/316), Alloy Steel
- Pressure Ratings: Class 150 to Class 2500
- Size Range: 1/2" to 60" nominal pipe size
- Standards Compliance: ASME B16.5, B16.47, API 605, AWWA C207
- Surface Treatment: Anti-corrosion coating, galvanizing available
- Temperature Range: -20°F to 1000°F (-29°C to 538°C)
Welded Flange Dimensions
| NPS (inches) | OD (mm) | Thickness (mm) | Bolt Circle (mm) | Number of Bolts |
|---|---|---|---|---|
| 1/2 | 90 | 11.2 | 60.3 | 4 |
| 2 | 152 | 16.0 | 120.7 | 8 |
| 6 | 279 | 22.2 | 190.5 | 12 |
| 12 | 406 | 28.4 | 298.5 | 16 |
| 24 | 610 | 38.1 | 457.2 | 20 |
Welded Flange Types We Offer
- Welding Neck Flanges: Highest strength for critical applications
- Slip-On Welded Flanges: Easy installation and cost-effective
- Socket Weld Flanges: For small diameter high-pressure systems
- Lap Joint Flanges: For systems requiring frequent disassembly
- Threaded Flanges: For low-pressure piping without welding
- Blind Flanges: For sealing pipe ends or vessel openings
Welded Flange FAQ
Q: What are the advantages of using welded flanges over other connection methods?
A: Welded flanges provide superior leak-proof performance compared to threaded or bolted connections. They offer higher pressure ratings, better mechanical strength, and longer service life in demanding applications. The welded connection eliminates potential leak paths and provides excellent vibration resistance, making them ideal for critical piping systems.
Q: How do I determine the right welded flange for my application?
A: Selection depends on four key factors: 1) Operating pressure and temperature requirements 2) Pipe material and size 3) Medium being transported (corrosive, abrasive etc.) 4) Environmental conditions. Our engineers can help evaluate your specific needs and recommend the appropriate flange type, material grade, and pressure class.
Q: What quality certifications do your welded flanges comply with?
A: Our welded flanges meet multiple international standards including ASME B16.5, ISO 7005-1, EN 1092-1, and PED 2014/68/EU. We provide full material traceability with Mill Test Certificates (MTC) and offer third-party inspection services from DNV, TÜV, or BV upon request. All products undergo rigorous dimensional checks, visual inspections, and material verification.
Installation Best Practices
- Ensure proper alignment before welding to prevent stress on the piping system
- Follow ASME welding procedures for your specific material combination
- Use appropriate backing rings or weld rods for dissimilar metal joints
- Perform post-weld heat treatment when required by material specifications
- Conduct hydrostatic testing to verify joint integrity
Maintenance Considerations
Regular inspection of welded flanges should include checking for:
- Signs of corrosion or erosion on flange faces
- Bolt tightness and proper gasket compression
- Thermal expansion-related stress on the weld joint
- Leakage at the flange-to-pipe connection
For high-temperature applications, consider periodic re-torquing of bolts and replacement of gaskets according to maintenance schedules.