Large Diameter High Pressure Weld Neck Flange
- High Pressure Rating: Suitable for high-pressure conditions with pressure rating up to Class600 and above
- Large Diameter Design: Specially designed for large diameter pipes with wide specification range
- High Connection Strength: Butt-weld connection with high connection strength and good reliability
- Excellent Sealing Performance: Necked design with high-precision sealing surface machining
- Good Fatigue Resistance: Excellent fatigue resistance suitable for cyclic loading conditions
- Wide Application: Suitable for high-pressure systems in oil, chemical, natural gas and other industries
Large Diameter High Pressure Weld Neck Flange is a flange product specially designed for large diameter, high-pressure pipeline systems with higher pressure ratings and stricter sealing requirements. The product adopts a necked butt-weld structure, directly connected to the pipe through the neck welding, with high connection strength and excellent sealing performance. Large diameter high pressure weld neck flanges are widely used in pipeline connections under high-pressure conditions in industries such as petrochemical, natural gas, power, and offshore engineering, suitable for conveying high-pressure fluid media. The flanges are manufactured using high-quality carbon steel, stainless steel or alloy steel materials, undergo precision machining and heat treatment to ensure excellent mechanical properties and pressure resistance. The product is strictly manufactured according to international and national standards such as ASME, ANSI, and GB, meeting various demanding operating conditions.
Technical Standards
| Item | Technical Standard |
|---|---|
| Material | A105, A182 F304, A182 F316, A182 F316L |
| Pressure Rating | Class150-Class2500 |
| Size Range | NPS 2"-NPS 60" (DN50-DN1500) |
| Temperature Range | -29℃ to +538℃ |
| Connection Type | Butt-weld Connection |
| Facing Type | Raised Face (RF), Ring Joint (RTJ), Tongue & Groove (TG) |
| Manufacturing Standard | ASME B16.5, ASME B16.47, GB/T 9113 |
| Inspection Standard | ASME B16.47, GB/T 9124 |
Basic Models
| Model | Type | Features |
|---|---|---|
| LDWN-300 | 300LB Large Diameter Weld Neck Flange | Medium pressure application, cost-effective |
| LDWN-600 | 600LB Large Diameter Weld Neck Flange | High pressure application, high strength |
| LDWN-900 | 900LB Large Diameter Weld Neck Flange | Ultra-high pressure application, safe and reliable |
| LDWN-1500 | 1500LB Large Diameter Weld Neck Flange | Extremely high pressure application, special conditions |
Main Components Material Table
| No. | Part Name | Material |
|---|---|---|
| 1 | Flange Body | A105, A182 F304, A182 F316 |
| 2 | Sealing Face | Same as flange body or overlay alloy |
| 3 | Weld Bevel | Matched to pipe material |
| 4 | Surface Treatment | Anti-corrosion coating, sand blasting treatment |
| 5 | Inspection Marking | Laser marking or engraving |
No drawing available.
