| 摘要 |
PURPOSE:To facilitate rust inhibiting treatment after a pressure proof test, by performing the pressure proof test by injecting an aqueous ammonium bicarbonate solution in a heat exchanger and discharging said aqueous solution after the completion of the pressure proof test. CONSTITUTION:Blind plates 20, 21 are attached to the barrel side tube stands 4, 5 provided to the barrel 2 of a heat exchanger 1, and a pressure feed pipe 14 and a return pipe 15 are connected to connection ports. Next, a valve 13 is closed while a valve 11 is opened and a pressure feed pump 10 is operated to feed the aqueous ammonium bicarbonate solution in a tank 9 to the barrel side chambers of a heat exchanger 1 under pressure to perform a pressure resistance test. The concn. of the aqueous solution is pref. 1-10wt%. After the completion of the pressure proof test, the valve 13 is opened and the aqueous solution in the heat exchanger 1 is returned to the tank 9 by a return pump 12 and the blond plates 20, 21 are detected to discharge the aqueous solution. Next, blind plates are attached to water chamber side tube stands 6, 7 to perform the same operation. By this method, rust inhibiting treatment is also finished simultaneously with the pressure proof test. |
