- High strength and fatigue resistance
- Even stress distribution
- Leak-tight butt-weld joints
- Long neck version adds reinforcement and replaces short spools in vessel connections
Standards, Materials, Sizes and Variations
- Size Range: 15mm to 1800mm
- Ratings: 150lb to 2500 lb
- Types Weldneck and long Weld neck
- Flange Standards:
ASME/ANSI B16.5 B16.47 Class 150-2500
AS2129 Table D, Table E, Table F, Table H, Table J
DIN PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, and PN 100
JIS 5K, 10K, 16K, 20K, and 30K,
API 6A 2000psi to 10,000psi (13.8 Mpa to 130 Mpa)
ASME/ANSI B16.5, B16.47. Class 150, Class 300, Class 600, Class 900, Class
1500, and Class 2500 - Materials: All major Carbon and Stainless steels available in a forged material
- Fast Delivery - Stock items same day, custom orders typically 10-20 days
What is a Weld Neck Flange?
A weld neck flange has a long tapered hub welded to the pipe. The design provides strong, leak-proof joints and transfers stress evenly, making it suitable for high-pressure and high-temperature systems. Because they provide robust joints they are used where a consistent seal is mandated or where the piping may be exposed to stressed environments.
What is a Long Weld Neck Flange?
A long weld neck flange extends the hub length of a standard weld neck. It often replaces a short pipe piece and is commonly used as a nozzle on pressure vessels and tanks. The longer neck adds structural support, reduces stress, and improves flow alignment.
Materials
Material Grades Key Features Applications
| Material | Grades | Key Features | Applications |
|---|---|---|---|
| Carbon Steel | ASTM A105 | Strong, durable, cost-effective | General service, oil & gas, high-pressure piping |
| Alloy Steel | Various | High temperature & pressure use | Power plants, refineries, high-stress environments |
| Stainless Steel | 304, 316 | Corrosion resistance | Chemical, food processing, marine applications |
| Duplex Stainless Steel | 2205 | Strength + chloride resistance | Offshore, marine, and aggressive environments |
| Nickel Alloys | Inconel, etc | Extreme heat & chemical resistance | Aggressive chemicals, high-temperature service |
Advantages of Weldneck Flanges
Limitations of Weldneck Flanges
- Higher cost due to more material and machining
- Complex installation requiring skilled welding
- Bulkier design, harder to transport and handle
- Longer lead times for custom sizes or special alloys
Why Choose Balcombe Engineering
Quality Assurance
Flanges meeting international standards (ANSI, DIN, JIS, AS)
Extensive Range
Wide selection of flange types, sizes, and materials
Expert Support
Real people, knowledgeable and experienced. Ready to assist with your needs
Competitive Pricing
High-quality flanges at affordable prices
Nationwide Delivery
Prompt service across Australia
Custom Manufacturing
Able to manufacture flanges to your custom drawing specifications
