METHOD OF CATHODIC CORROSION PROTECTION OF INTERNAL SURFACES OF PIPE LINE FITTINGS AND DEVICE FOR REALIZATION OF THIS METHOD Russian patent published in 2005 - IPC

FIELD: electrochemical corrosion protection of internal surfaces of fittings of pipe lines carrying aggressive media.

SUBSTANCE: proposed method includes forming the passage of dielectric branch pipe in approximate vicinity of fittings to be protected and placing the anode in it. Anode is made in form of hollow cylinder with area of surface which is in contact with medium carried in pipe line equal to or exceeding internal surfaces of fittings. Anode is pressed in dielectric branch pipe fitted in pipe line tightly to its internal surface. Fitting is electrically insulated from pipe line. Dielectric branch pipe and anode consist of two sections separated by fittings. Sections of anode are brought in electrical and mechanical contact with fittings. Device proposed for realization of this method includes flanged joints for connection of fittings with pipe line, elastic dielectric gaskets laid between flanges, dielectric branch pipe located in immediate proximity of fittings to be protected and anode. Anode is made in form of hollow cylinder whose area of surface brought in contact with medium of pipe line is equal to or is more than area of internal surfaces of fittings. Anode is pressed in dielectric branch pipe fitted in pipe line tightly to internal surface. Flanged joints connecting the pipe line with fittings are provided with elastic dielectric bushes and washers fitted on rods and under heads of bolts and nuts. Holes for bolts in flanges are drilled according to outer diameter of bushes. Dielectric branch pipe and anode consists sections divided by fittings each. Mounted on end of each section of anode directed towards fittings is bush which is provided with collar and is pressed on it and locked by means of countersunk rivets. Collar of this bush is pressed between elastic dielectric gasket and flange of fittings. Surface of bush is covered with corrosion-resistant dielectric coat but for sections which are in contact with flange of fittings and with anode. Proposed method provides enhanced protection of fittings at symmetric and smooth distribution of protection in current density.

EFFECT: enhanced efficiency of corrosion protection; ease of mounting parts in pipe line.

3 cl, 3 dwg