METHOD FOR RAPID CONTROLLED COATING OF THE INNER SURFACES OF PIPES WITH A TENACIOUS CALCITE LINING

摘要

ABSTRACT OF THE DISCLOSURE.The present invention relates to a method for obtaining atenacious in-situ coating deposition of calcite on the inner surfaceof water pipes at very high rates. The calcite producingingredients are supplied to the water stream in quantitiessupplementing concentrations available in the natural water used,giving the required supersaturation levels by addition of suitablesalts to provide an aqueous lining solution supersaturated withrespect to calcium carbonate containing dissolved calcium andcarbonate ions. The method consists in maintaining the suspendedcalcium carbonate particles concentrations in the lining solutionbelow 300 ppm, the excess suspended particles being removed byphysical means. The calcite coating deposition according to thepresent invention has the advantage that it occurs at the rate ofabove 5 microns/h and even above 50 microns/h, maintaining acompletely corrosion-free system during the coating. Themethod is applicable to lead pipes, cement mortar linings orasbestos pipes.