FIELD: pipe line fittings. SUBSTANCE: proposed method includes isolation of inner surfaces of tube ends from pipe line interior by means of cylindrical envelopes made from corrosion-resistant steel and corrosion0resistant weld. Cylindrical envelopes made from corrosion-resistant steel and their corrosion-resistant welds are isolated from pipe line interior by means of cylindrical envelopes made from carbon steel or low-carbon steel and their welds. Standard electrode potential of cylindrical envelopes made from carbon steel or low-carbon steel and their welds is lesser than that of envelopes made from corrosion-resistance steel and their welds but it does not exceed standard electrode potential of metal of pipes and their welds. EFFECT: enhanced corrosion protection. 1 dwg
