DEVICE AND METHOD FOR ELECTROCHEMICAL PRODUCTION OF PIPELINE VALVES AGAINST INTERNAL CORROSION

摘要

FIELD: machine building.;SUBSTANCE: anode protectors are fitted directly at pipeline fittings shutoff valve and secured thereat by thread joint. Cathode is composed by pipe fittings shutoff element, pipe fittings drive shaft, rod or spindle and pipe fittings body. Pipeline fittings shutoff valve and anode protector are additionally connected by permanent or conditionally-plug-in metal joints in single electric circuit with total resistance for dry metal not over 0.1 Ohm. Anode protector material is selected subject to cathode material and concentration of chloride-ion in working medium so that algebraic difference Δφ of electrochemical cathode and anode potentials φk and φa satisfies the relationship: 0.4 V ≤ Δφ ≤ 0.5 V.;EFFECT: higher efficiency of protection.;18 cl, 2 dwg, 2 tbl