Metallurgical clad pipe and Mechanical composite pipe


Bimetallic clad pipe is the thin-wall corrosion-resistant alloy lined ordinary petroleum pipe. The corrosion resistant metal can be selected according to the corrosion environment of oil field. Normal materials are stainless steel 316L, super 13Cr, duplex stainless 2205, 22Cr, nickel-based alloy 825, etc.
Bimetallic clad pipe combines the advantages of materials to show the advantages of high strength of base pipe and corrosion resistance of lining pipe which improves pipelines safety and extends pipeline life. The gathering and transportation cost of oil and gas exploitation will be significantly reduced by reducing the usage of corrosion resistant alloy pipe.
In the aspect of clad pipe manufacturing method and production process, bimetallic clad pipe can be divided into two categories according to the combination form of base pipe and lining pipe: mechanical composite pipe and metallurgical clad pipe. However, mechanical composite pipe, the inner pipe is easy to peel off due to low adhesion strength between the outer pipe and the inner pipe. Especially when the mechanical pipe is made outer corrosion prevention(such as: 3PE) under the condition of high temperature (200℃), it easily appears collapse which will bring the loss of engineering downtime and potential safety hazard. When the mechanical composite pipe is handled the end groove sealing, the quality stability of seal welding is extremely high, which can easily cause welding defects and affect butt welding on site.

Application principle of corrosion-resistant metallurgical clad pipe:
The wall thickness of base pipe is used as the pressure bearing layer to ensure the safety of pressure.
The wall thickness of inner pipe is used as the functional layer to make the base pipe more resistant to corrosion.
Tianyang metallurgical clad pipe(Pressure Melting&Anchoring Techology):
OD: 19~350mm
WT of base pipe: 2~36mm
WT of inner pipe: 0.5~5mm


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Problems of mechanical composite pipe

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Material Selection basis of corrosion-resistant alloy pure material (corrosion mechanism of natural Gas Field)

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Advantages of bimetal metallurgical clad pipe

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