RSP™ — Right Spinning Pressure
ZONX proprietary metallurgical bonding that unites carbon steel strength with CRA corrosion protection — cut it, weld it, bend it, the liner stays put.
How RSP™ Works
Four steps from assembly to verified metallurgical bond
Controlled Assembly
Outer carbon steel pipe and inner CRA liner are assembled with a precise interference fit.
Spinning Pressure
During rotation, the outer pipe inner wall plastically deforms while the liner elastically deforms.
Metallurgical Bond
Elastic recovery after spinning creates a continuous metallurgical bond at the interface.
Verified Strength
Bonding force reaches 0.2–16 MPa — far above the API 5LD minimum of 0.3 MPa.
RSP™ vs Other Lining Methods
Compared with interference expansion, hydraulic expansion, and mechanical drawing
| Dimension | RSP™ | Interference | Hydraulic | Drawing |
|---|---|---|---|---|
| Bonding Strength | ||||
| Production Efficiency | ||||
| Production Cost | ||||
| Applicable Size Range |
Core Advantages
Key performance metrics behind DURACORE™ clad pipe
53× above API 5LD minimum
Oil & gas to water service
vs. solid CRA alloy pipe
Thermal cycling rated
Ultrasonic + eddy current
Welding Technology
Welding is the critical link in any clad pipe system. ZONX provides comprehensive welding technical support — specialized WPS/PQR for transition welds, on-site training, and post-weld inspection to ensure joint integrity matches parent metal performance.
- Clad pipe welding is a critical technology — special procedures ensure both the inner liner and outer base pipe are fully penetrated.
- Dedicated filler metals and WPS parameters matched to each material combination.
- Weld joint performance meets or exceeds parent metal requirements.
Specify RSP™ clad pipe for your project
Our engineers will help you select materials, dimensions, and testing requirements.
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