Hebei Shunlinfeng Pipeline Manufacturing Co., Ltd.
PRODUCTS
CONTACTS
Tel/WhatsApp: +8613315790503
Email: admin@shunlinfeng.com
Address: Yanshan County, Cangzhou, Hebei Province, China
High-Pressure Threaded Pipe Couplings
Keyword:
Product Detail
Standard
Product introduction
High-Pressure Threaded Pipe Couplings (Screwed Unions) – Technical Specification
1. Product Definition
A high-pressure threaded pipe coupling (screwed union) is a mechanical pipe connector designed to join two pipes in a straight run using precision-cut threads for systems operating at 1,000–10,000 psi. These fittings provide a separable joint while maintaining pressure integrity in critical applications where welding is impractical.
2. Design Features
✔ Heavy-Duty Threads: Rolled or machined threads with 30% deeper engagement than standard couplings for high-pressure resistance.
✔ Metal-to-Metal Seal: Tapered threads (NPT/BSPT) create a mechanical seal under tension.
✔ Hex Nut Design: Allows wrench tightening without damaging the pipe.
✔ Anti-Blowout Shoulder: Reinforced collar prevents thread stripping under extreme pressure.
✔ Optional Sealing Methods:
- PTFE tape (for NPT threads up to 3,000 psi)
- Liquid thread sealant (Loctite 545 for >5,000 psi)
- Metal sealing rings (for BSPP parallel threads)
3. Performance Advantages
- Quick Installation: No welding required—suitable for field repairs.
- Reusability: Can be disassembled and reassembled multiple times.
- Vibration Resistance: Thread-locking compounds prevent loosening in dynamic systems.
- Space Efficiency: More compact than flanged connections.
4. Installation Guidelines
1. Thread Preparation:
- Clean threads with a wire brush.
- Apply 2–3 wraps of PTFE tape (for NPT) or high-pressure sealant (e.g., Henkel 577).
2. Hand-Tightening:
- Engage threads fully by hand (minimum 3.5 turns for NPT).
3. Final Torque:
- Use a strap wrench to avoid thread damage.
- Tighten 1.5 turns past hand-tight (per ASME B31.3).
4. Pressure Testing:
- Hydro-test at 1.5× working pressure before full operation.
5. Industry Applications
- Oil & Gas: Wellhead control lines, hydraulic fracturing manifolds.
- Power Plants: Steam instrumentation lines.
- Chemical Processing: High-pressure reagent dosing systems.
- Aerospace: Fuel and hydraulic test rigs.
6. Quality & Compliance
- Material Certs: ASTM A105/A182 with 3.1 mill test reports.
- Thread Inspection: 100% GO/NO-GO gauge verification.
- Pressure Testing: Each unit hydro-tested per ASME B16.11.
- NACE MR0175: Compliant for sour (H₂S) environments.
7. Limitations
✗ Not for Cyclic Loading: Threads may fatigue under constant vibration.
✗ Limited to Small Pipes: Generally not used above 2" NPS for high-pressure.
✗ Sealant Dependency: Requires proper sealing to prevent leaks.
Factory
Product packaging
We can provide wooden box packaging, pallet packaging, carton box packaging, and we can accept customized packaging.
FAQ
Q:Can I Get A Sample For Testing?
A:Yes, We Can Provide Free Samples, But You Need To Pay For The Shipping Cost.
Q:Is It Safe On The Payment For Me As We Are The First Cooperation?
A:We Can Do The Trade Assurance On Alibaba, Which Will Guarantee Your Payment Safety, We Also Accept Other Safe Payment Way As You Want.
Q:Do You Accept Product Customization?
A:Yes, We Can Accept Material Customization, Specification Model Customization, Drawing Customization, Packaging Customization.
Q:Can I Put Our Logo On The Product?
A:Yes, We Can Provide You With Laser Engraving Logo And Sticker Logo For Free.
Q:What Is The Moq?
A:For Trial Order, We Can Sell Even One Piece
Q:How Long Is The Product Warranty Period?
A:One Year, If The Product Is Non-Artificially Damaged During The Warranty Period, We Can Provide You With A New Product For Free.
Q:How Long Is The Delivery Time?
A:If We Have Stock, We Will Ship Within 2 Days, If There Is No Stock, We Will Ship Within 5-7 Days.
Q:Do You Accept Oem/Odm Service?
A:Yes, We Can Produce Products According To Your Requirements.
Related Products
Product Consultation
We will contact you within one working day. Please pay attention to your email.
Contact Us
Mr.Jasper
Company Address:Yanshan County,Cangzhou City,Hebei Province,China
Contact Us
Scan code to contact us
