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Email：sales@sunwardpiping.com
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CLAD PIPE
Price：On the Phone $
classification：Clad Pipe
model：On the Phone
size：On the Phone
Why Use CRA Lined Pipes
CRA lined steel pipes are carbon steel pipes internally lined with a corrosion-resistant alloy (CRA) to combine the mechanical strength and low cost of carbon steel with the corrosion resistance of high-performance alloys. These pipes are widely used in industries like oil & gas, petrochemical, and chemical processing, especially where aggressive and corrosive media (like sour gas, seawater, or acidic fluids) are present.
Full Meaning
· CRA = Corrosion Resistant Alloy
· CRA Lined Pipe = Carbon steel pipe + corrosion-resistant internal lining (typically CRA)
Structure
· Outer pipe: Usually made from carbon steel (e.g., API 5L grade B, X42, X52, etc.)
· Inner lining: Made from CRA material, such as:
o Stainless steel (304L, 316L)
o Nickel alloys (Inconel 625, Hastelloy, Alloy 825)
o Duplex or Super Duplex stainless steel
The CRA lining is mechanically bonded or metallurgically bonded (cladded) to the base pipe.
Why Use CRA Lined Pipes？
Requirement | CRA Lined Pipe Advantage |
Corrosion resistance | Lining protects against internal corrosion |
Cost-effective | Cheaper than using solid CRA pipe |
High strength | Maintains structural strength of carbon steel |
Long service life | Reduces need for frequent maintenance/replacement |
Suitable for sour service | Meets NACE MR0175 / ISO 15156 standards |
Common Applications
· Offshore and onshore oil & gas pipelines
· Subsea flowlines
· Produced water lines
· Refinery and petrochemical service
· Acidic or H₂S-rich environments
Lining Methods
1. Mechanically lined:
· Insert CRA liner pipe inside carbon steel pipe
· Use processes like hydraulic expansion to bond
2. Metallurgically bonded (Clad pipes):
· CRA material is cladded using roll bonding, explosion bonding, or weld overlay
· Stronger bond and suitable for high-pressure/high-temperature
CRA Lined Pipes vs Solid CRA Pipes
Feature CRA Lined Pipe Solid CRA Pipe
Feature | CRA Lined Pipe | Solid CRA Pipe |
Cost | Much lower cost (uses less CRA material) | Expensive (entire pipe is CRA) |
Strength | High (from carbon steel base) | Lower (depends on CRA material, often softer) |
Corrosion Resistance | High (only on internal surface) | Very high (throughout pipe wall) |
Weight | Heavier (due to carbon steel) | Lighter (CRA materials often lower density) |
Fabrication complexity | More complex (requires bonding/lining tech) | Easier (homogeneous material) |
Availability / Lead Time | May have longer lead time (custom manufacture) | Often faster if stock pipe is available |
Welding / Joining | Needs special attention to avoid dis-bonding | Standard CRA welding (but costlier) |
Best Use | Long pipelines, corrosive fluids, cost-sensitive | Short spools, small bore, extremely corrosive cases |
CRA Lined Pipes vs CRA Clad Pipes
Feature | CRA Lined Pipe | CRA Clad Pipe |
Bonding Type | Mechanical (e.g., hydraulic expansion) | Metallurgical (welded or bonded) |
Bond Strength | Lower – potential risk of liner dis-bonding | High – strong metallurgical bond |
Thermal/Pressure Resistance | Moderate – liner may fail under high stress | Excellent – withstands high temperature/pressure |
Cost | Lower (simpler manufacturing) | Higher (complex bonding process) |
Inspection | Harder to inspect liner bonding | Easier NDT methods available for clad layer |
Repairability | Difficult – liner damage often irreparable | Easier – overlay welding possible |
Common Method | Mechanically lined with CRA insert | Roll bonded, weld overlay, or explosion bonded |
Best Use | Long pipelines, mild/moderate pressure | Severe conditions (e.g., HPHT, sour service) |
Summary
Use CRA Lined Pipes when you need cost-effective corrosion protection for low-to-medium pressure/temperature applications.
Use CRA Clad Pipes for high-risk, high-pressure, or high-temperature environments where bond integrity is critical.
Use Solid CRA Pipes only when maximum corrosion resistance is required throughout (like for small-size, specialty lines, or spools in severe environments).
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