ANTICORROSIVE INJECTOR

PURPOSE:To form a uniform and good-quality anticorrosive iron coating film on the inner surface of a copper contg. pipe by mixing an appropriate amt. of the carboxylic acid soln. controlled in conformity to the chlorine concn. and temp. of seawater with a ferrous sulfate soln. and injecting the mixture into the seawater to be passed through the pipe. CONSTITUTION:The carboxylic acid soln. and the ferrous sulfate soln. are supplied respectively from a carboxylic acid soln. tank 1a and a ferrous sulfate soln. tank 1b through fixed delivery pumps 3a and 3b, and mixed in a mixing tank 10. The mixture is injected into the seawater in a seawater inlet pipe 6 through an injection nozzle 5, and then passed through a copper alloy pipe 7. In the anticorrosive agent injector, a chlorine concn. detector 13 and a seawater temp. detector 14 are set in the seawater inlet pipe 6 on the upstream side of the insertion position for the nozzle 5. The detection signals therefrom are received by a controller 12, the pump 3a is controlled in conformity to the chlorine concn. and temp. of seawater, and the amt. of the carboxylic acid soln. to be injected is adjusted. By this method the optimum injection condition is maintained at all times, and a uniform and good-quality iron coating film can be formed on the inner wall surface of the pipe 7.