MAINTENANCE INSTALLATION OF HEAT EXCHANGER

PURPOSE:To protect heat transfer pipes of a cupper type heat exchanger from the corrosion by sea water at the sea water side of the heat exchanger, by a method wherein the corruption of sea water is detected and the corrupted water is replaced with clean sea water. CONSTITUTION:When there is no heat load 11 (such as while a plant is stopped), a pump 1 is stopped, and accordingly sea water is left staying in filled condition in a piping 3, a heat exchanger 4, and a piping 5, and when the heat exchanger is stopped for a long time, sea water is corrupted, and, as a result, a cupper type heat transfer pipe is damaged. Accordingly, a pH meter 13 is provided to monitor the quality of the filled staying sea water, and when the pH meter indicates below 7.5 or above 10, an alarm 30 tells abnormal condition, and an operator starts the pump 1 after affirming the alarm, and opens a valve 6 and the corruption progressing sea water is flushed out and is replaced with clean sea water. The pump 1 is stopped and the valve 6 is closed after the pH meter returned to pH 7.5-10, and the heat exchanger is suspended again. By means of this, the plant can be operated normally, because heat transfer pipes are not corroded by sea water nearby.