Abstract:
Objective The aim is to establish a method of evaluating the corrosion resistance of bimetal composite pipe girth weld, and provide a basis for the field application of bimetal composite pipe in high acid gas field.
Methods In view of the main corrosion types of bimetallic composite pipe girth welds in high acid environment, the intergranular corrosion, SCC/SSC resistance, point corrosion and corrosion under simulated condition were determined as evaluation indexes by referring the standard Q/SY 06018-2016 Corrosion evaluation contents of straight weld and surfacing layer of metallurgical composite pipes. The method was verified through the whole pipe section test, and the domestic L360/825 metallurgical composite pipe girth weld was taken as an example to verify the method.
Results The method was used to evaluate the corrosion resistance of the girth weld of L360/825 bimetal composite pipe, and the evaluation method was validated to be effective and reliable. The evaluation results showed that the girth weld of L360/825 bimetal composite pipe had good corrosion resistance.
Conclusion The method can be directly applied to the evaluation of girth weld corrosion resistance of bimetallic composite pipe used in high acid gas field, which provides a basis for the field application of bimetal composite pipe.
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