CRA CLAD & LINED PIPE
CRA Clad Pipe Manufacturing Methods
The CRA Clad Pipe is a bimetallic pipe composed of an internal (and in some cases external) CRA layer that is metallurgically bonded to the backing steel. The cladding may be bonded by hot rolling, coextrusion, weld overlay, explosion bonding, powder metallurgy, or some other process that produces a metallurgical bond.
The CRA Clad Pipe consists of a carbon steel or alloy steel pipe with an internal or external CRA liner. The CRA liner is affixed or tightly fitted to the base-metal pipe full length by expansion, compression cold forming, or some other means.
The CRA liner may be a tube or pipe inserted into a steel pipe, a plate or sheet rolled into a cylinder by expanding the liner and/ or shrinking the base pipe, or by some other applicable processes. The clad process results in a quite firm metallurgical bonding at the interface of the backing steel and the CRA layer. The mechanical bonding formed by the lining process is relatively “loose” in a lined pipe.
Although the clad pipe exhibits better mechanical performance, its cost is relatively higher.
Here are options to manufacture the Lined Steel Pipe:
Option 1 with external carbon steel seamless pipe internal alloy welded pipe: Outer Pipe (Backing Steel Pipe) Inspection – Cutting – Machining Backing Steel Pipe – Cleaning Inner Surface – Assembling Inner Alloy Pipe – Hydroforming – Cutting Lined Pipe Ends – Beveling – Welding – Sizing pipe End – Forming – RT – ET & Endoscope – Ultrasonic Test – PT – Measuring Size and Inspection – Marking – Packing
Option 2 with CRA lined or clad steel plate: Mechanical lined or cladded Steel Plate Checking – UT for Lined Steel plate – Plate Beveling – Performing – Forming to Pipe (JCOE) – Welding – Rounding – Hydrostatic test – Beveling pipe end – X-Ray Test- Ultrasonic Test – Size Inspection and Measuring – Marking – Packing and Storage