FIELD: corrosion protection of pipe lines in performing the erection and repair jobs. SUBSTANCE: material of protective coat is placed on flexible envelope of transport module and is introduced into zone of welded joint; then flexible envelope is inflated and material is pressed to inner surface of pipe line and is kept in this position till hardening of material. Provision is also made for external heating of pipe line. Description contains recommendations for sequence of operations. EFFECT: facilitated procedure of application of protective coat; increased strength of coat. 5 cl, 1 dwg
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