Forged Welding Neck

Butt-neck flange | The ultimate sealing Fortress for high-pressure pipelines

'ASME B16.5 certified | Zero leakage architecture | Lifetime maintenance-free commitment'

 

 

Butt-neck flange (WN flange) with ** conical neck transition structure + full penetration butt-welding process ** is the gold standard connection solution for pipelines under extreme conditions:

Mermaid

Graph TB

A[Traditional flange pain point] --> B[Weld stress concentration]

A --> C[Thermal deformation leakage]

A --> D[Vibration fatigue fracture]

E[Butt neck solution] --> F[conical neck] --> G[Stress dispersion ↑300%]

E --> H[Full penetration welding] --> I[Fatigue resistance ↑10x]

E --> J[Long straight edge section] --> K[Zero deformation of sealing surface]

 

+ 35MPa ultra-high pressure hydrogen: Class 2500 RF+ octagonal pad, permeability <0.01ppm

+ Resistance to sulfur corrosion: A182 F52 duplex steel, NACE MR0175 certified

+ Case: Subsea Pipeline leak accident ↓92% (Verified by BP project)

+ Resistant to strong acids: Hastelloy C276 lining +PTFE seal, resistant to boiling hydrochloric acid

+ Thermal shock protection: Gradient heat treatment, adaptable to sudden changes from -196℃ to 540℃

+ Case: Zero leakage at PTA reactor interface for 5 years (Sinopec project)

 

+ 540 ° C supercritical steam: A182 F91 chromium-molybdenum steel, creep rate <0.001%/kh

+ Resistance to water hammer impact: The cone neck structure absorbs peak kinetic energy of 45%

+ Case: Supercritical unit life ↑ up to 15 years (Huaneng Group data)

 

Parameters	ASME Standards
Pressure grades	Class 150~2500
Caliber range	1/2"~24" (DN15~600)
Neck taper	1:3 (Standard)
Straight edge section length	Bevel +6.4mm
Material system	ASTM A105/A182

 

Hot Tags: forged welding neck, China forged welding neck manufacturers, suppliers, factory, butt welding flange, Reducer Flange, Butt Flange, Forged Welding Neck, ASME B16 5 WN