YanShan Shunlinfeng Pipeline Manufacturing Co., Ltd.
Product Description
Standard
Product introduction
High-Pressure Socket Weld Half-Couplings - Technical Specification
1. Product Definition
A socket weld half-coupling is a semi-circular pipe fitting designed to:
- Create branch connections on existing pressurized pipelines (up to Class 6000)
- Provide a socket weld outlet while requiring only 180° pipe access
- Eliminate full pipe disassembly for maintenance/modifications
2. Critical Design Features
- Split-Socket Design: Allows installation without pipe removal
- Reinforced Weld Pad: 25% thicker than standard couplings
- Alignment Notches: Ensure precise positioning during welding
- Smooth Bore Transition: Minimizes turbulence (Ra ≤ 32 µin)
3. Installation Procedure
1. Surface Preparation:
- Clean pipe surface to SA 2.5 standard
- Align coupling using alignment pins
2. Tack Welding:
- 4 equidistant tack welds (min. 6mm length)
3. Final Welding:
- GTAW root pass (Argon purge)
- SMAW fill/cap passes (E7018)
4. Post-Weld:
- PWHT for alloys (per ASME Sec VIII)
- Liquid penetrant inspection
4. Performance Data
- Burst Pressure: 4× rated working pressure
- Cyclic Fatigue: 50,000 cycles at 1,500 psi (per ASTM E606)
- Temperature Range:
- Carbon steel: -29°C to 425°C
- Stainless: -196°C to 815°C
5. Industry Applications
- Power Generation: Steam line instrumentation taps
- Oil & Gas: Pipeline hot-tap connections
- Chemical Plants: Reactor feed line modifications
- Shipbuilding: Hydraulic system retrofits
6. Standards Compliance
- ASME B16.11: Socket weld dimensions
- ASTM A961: Material requirements
- PED 2014/68/EU: CE marking for pressure equipment
- NACE MR0175: Sulfide stress cracking resistance
7. Advantages vs Alternatives
✓ 50% faster installation than full-wrap couplings
✓ No system downtime for installation
✓ Stronger than threaded alternatives at high pressure
✓ Smoother flow than saddle-type connections
Note: For pipes >3" NPS, recommend integrally reinforced designs with contoured weldpads.
8. Quality Assurance
- 100% UT of forging blanks
- Hydrostatic test at 1.5× rated pressure
- PMI verification for alloy content
- Dye penetrant examination of all welds
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Company Address:Yanshan County,Cangzhou City,Hebei Province,China
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