FIELD: machine building.
SUBSTANCE: invention refers to pipeline transporting and can be implemented at construction, re-construction and repair of pipelines in oil producing and petrochemical industries, and also in system of housing and communal services. Before welding at the moment of pipe assembly the internal zone of welded joints is insulated by means of an internal protecting bushing with external diametre less, than internal diametre of a pipe made out of corrosion-resistant material; the said bushing is attached to an internal wall of the pipe in the zone of welded joints and to ends of cement-sand coating by means of hydrophilic sealing composition.
EFFECT: invention reduces labour intensiveness, increases efficiency and quality of process of protecting zones of welded joint of metal pipes with internal cement-sand coating from corrosion.
2 dwg
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