YanShan Shunlinfeng Pipeline Manufacturing Co., Ltd.
Product Description
Standard
Product introduction
Internal Thread 45-Degree Elbow – Technical Specification
1. Definition & Purpose
An Internal Thread 45-Degree Elbow is a pipe fitting designed to change flow direction by 45° using female (internal) threads on both ends. It enables smooth directional changes in low-to-medium pressure systems where welding is impractical or disassembly is required.
2. Key Features
- 45° Angle: Reduces pressure drop compared to 90° elbows.
- Internal (Female) Threads: Conforms to NPT (National Pipe Thread) or BSPT (British Standard Pipe Taper) standards.
- Materials:
- Carbon Steel: ASTM A105 (general service)
- Stainless Steel: ASTM A182 F304/316 (corrosion resistance)
- Brass/Bronze: For water & low-pressure gas
- PVC/CPVC: Chemical & drainage applications
- Pressure Rating: Typically Class 150 to 3000 (varies by material).
3. Types & Variations
| Type | Description | Common Use |
|------|-------------|------------|
| Standard 45° Elbow | Equal female threads on both ends | General plumbing, HVAC |
| Street Elbow | One female & one male thread | Direct pipe-to-pipe connection |
| Reducing 45° Elbow | Different thread sizes at each end | Pipe diameter transitions |
4. Applications
✔ Plumbing: Water supply lines, drainage systems
✔ HVAC: Refrigerant lines, air handling units
✔ Industrial: Low-pressure hydraulic/pneumatic systems
✔ Oil & Gas: Instrumentation tubing, gauge connections
5. Advantages vs. Welded Elbows
✓ Easy Installation: No welding required; screw-on assembly
✓ Removable/Reusable: Ideal for maintenance or modifications
✓ Cost-Effective: Lower labor cost than welded alternatives
✓ Vibration Resistance: Less prone to fatigue cracking than welded joints
6. Limitations
✗ Not for High Pressure: Max ~3000 psi (depends on material)
✗ Thread Wear: Repeated disassembly may degrade threads
✗ Sealant Required: Teflon tape/dope needed to prevent leaks
7. Installation Guidelines
1. Thread Preparation:
- Clean threads, apply Teflon tape or pipe thread sealant.
2. Hand-Tighten First:
- Engage threads properly before using a wrench.
3. Final Torque:
- Tighten 1-2 turns past hand-tight (avoid over-torquing).
4. Alignment Check:
- Ensure proper flow direction before pressurizing.
8. Standards & Compliance
- ASME B1.20.1: NPT thread dimensions
- ASME B16.11: Pressure ratings for forged fittings
- ASTM A105/A182: Material specifications
- MSS SP-83: Threaded unions & elbows
Why Choose a Threaded 45° Elbow?
- Simplified Maintenance: No cutting/welding needed for repairs.
- Space-Saving: Compact design fits tight spaces.
- Versatility: Compatible with various pipe materials.
For high-pressure/temperature systems, consider socket weld or butt-weld elbows instead.
Need Customization? Options include:
- Electro-polished stainless steel (for ultra-clean systems)
- X-ray inspected threads (critical services)
- PTFE-lined elbows (chemical resistance)
Contact Us
Mr.Jasper
Company Address:Yanshan County,Cangzhou City,Hebei Province,China
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