Chongqing Water treatment Haferong Share laboratory ultrapure water machine purified water pipeline cleaning, passivation, disinfection:

　　Purification water system storage tank and stainless steel pipeline treatment (cleaning, passivation, disinfection) is divided into purified water cycle pre-flushing lye cycle cleaning purified water flushing passivation purified water flushing discharge disinfection again。

　　2 In the cleaning, passivation and disinfection of the pipeline, the UV lamp and the filter medium of the debacterialization filter shall not be installed, and the respirator shall not be installed。

　　① Purified water cycle pre-scouring:

　　Start the water system，When about 500L of purified water is injected into the pure water tank，Run the pure water pump for circulation，After 15mim, open each service point water valve，Discharge while cycling，When the pure water tank is low，Closed pure water pump，Fully open pure water tank drain valve and each operating point valve，After draining the water in the pure water tank and the water in the pipe，Seal all water point valves on pure water tank and pure water pipeline。

　　② Lye cleaning:

　　Start the water system to produce pure water (do not inject the prepared pure water into the pure water tank), and inject about 250L of purified water into the cleaning tank.5 kg NaOH (chemically pure), stirred well so that it becomes a 1% NaOH solution, transported to the pure water storage tank with a cleaning pump。According to the above manufacturing method, after the 1%NaOH solution is repeated once, it is transported to the pure water storage tank through the cleaning pump, and the volume of 1%NaOH cleaning liquid in the pure water storage tank should be 500L。

　　Open the purification pump, circulate the 1%NaOH cleaning solution in the purification tank and transport pipeline for 2H, open the purification water pipe at each operation point valve, discharge for about 3 minutes, and clean the valve。Fully open pure water tank drain valve, fully open each application point valve, drain pure water tank and pipe cleaning liquid。

　　After the cleaning solution is discharged, the pure water tank and the valve of each water point are closed to prepare the purified water for washing。

　　③ Purified water flushing:

　　Start the water system, inject the secondary reverse osmosis fresh water together into the cleaning box and the pure water box that make lye, and through the cleaning pump, the pure water in the cleaning box is transported to the pure water box, so that the cleaning box is cleaned。

　　When the pure water in the pure water tank reaches the median，Priming water pump，After 30 minutes of cyclic flushing of tanks and pipes，Open the water valve of each service point of the pure water transport pipeline together，Leave it partially open， Clean the valve with pure water for 3 minutes，Closed pure water pump，Open the drain valve of the pure water storage tank and the valve of each service point to empty。

　　After the discharge, continue to prepare purified water according to the above flushing method for the storage tank and pipeline circulation flushing, discharge, until the pure water tank inlet PH, electrical conductivity and pure water tank PH, electrical conductivity and total delivery, total return PH, electrical conductivity are consistent。

　　After the flushing is completed, the pure water tank and the valves of each application point should be opened for emptying. After the emptying is completed, all the valves of the pure water tank and pipelines should be closed to prepare for passivation。

　　④ Laboratory ultra-pure water machine passivation:

　　Prepare a nitric acid storage tank and water pump, and connect the pipe with the spray ball on the top of the pure water tank, and connect the secondary reverse osmosis fresh water with the acid tank。

　　Open the water system, prepare pure water into the acid tank (prohibit pure water into the pure water tank), put nitric acid (chemical pure) to make 8% of the acid 500L, start the pump, so that the acid is transported to the pure water tank。

　　Open the pure water pump, so that 8% of the acid liquid in the purification tank and transport pipeline circulation for 2H, and through the spray ball action on the top of the pure water tank, so that the nitric acid liquid on the inner surface of the pure water tank passivation。

　　Within 2H cycle of the above acid to pure water pipe, the point valves on the semi-open purification pipe are discharged for about 10 minutes, so that the nitric acid liquid is passivated at the valve (when passivating the valve, the container should be used to contain the nitric acid liquid, and the machine should be poured into the acid tank from the beginning and transported to the pure water tank).。

　　After the cycle time is completed, close the pure water pump, fully open the pure water tank drain valve, fully open the application point valve, and drain the passivation liquid in the pure water tank and pipeline。

　　Start the water system，Prepare pure water into the pure tank at about the median time，Open pure water pump，After 30 minutes of cyclic flushing of tanks and pipes，Open the water valve of each service point of the pure water transport pipeline together，Leave it partially open， Clean the valve with pure water for 3 minutes，Closed pure water pump，Open the drain valve of the pure water storage tank and the valve of each service point to empty。

　　After the discharge, continue to prepare purified water according to the above flushing method for the storage tank and pipeline circulation flushing, discharge, until the pure water tank inlet PH, electrical conductivity and pure water tank PH, electrical conductivity and total delivery, total return PH, electrical conductivity are consistent。

　　After the flushing is completed, the valves of the pure water tank and each application point should be opened and emptied. After the water tank and pipes are emptied, all valves of the pure water tank and pipes should be closed for disinfection。

　　⑦ Disinfection:

　　3% hydrogen peroxide manufacturing: open the water system, prepare purified water into the cleaning box (forbidden to enter the purification tank), inject pure water (250L), participate in 30%50L hydrogen peroxide in the cleaning box, make 6% hydrogen peroxide solution, and then transport to the pure water storage tank through the cleaning pump。After the delivery, pure water (200L) is injected into the cleaning box and transported to the pure water storage tank, so that the hydrogen peroxide concentration in the pure water storage tank is 3% and the volume is 500L。

　　Disinfection: Open the pure water pump, so that 3% hydrogen peroxide disinfectant in the pure water tank and pipeline circulation for 30 minutes, and through the spray ball to the inner wall of the tank circulation disinfection。

　　Disinfectant discharge: After the completion of 3% hydrogen peroxide circulation, open the valve of each application point of pure water, so that it is in a semi-open condition, so that the disinfectant disinfect the valve, until the disinfectant is exhausted。(If the disinfectant cannot be drained, the pure water pump should be closed, and the sewage valve of the pure water storage tank should be drained)。

　　Final scouring of pure water: When starting the water system to prepare pure water into the middle of the pure water storage tank, start the pure water pump, and rinse the storage tank and pipeline for 30 minutes, open the drain valve and the application valve of the pure water storage tank for empting。

　　After the laboratory ultra-pure water machine is emptied, the continuous preparation of pure water is transported to the center of the pure water storage tank, and the storage tank and pipeline are cycled and washed and discharged according to the above flushing methods until the secondary reverse osmosis fresh water, pure water storage tank, total delivery, total return PH, and electrical conductivity meet the requirements of the code。

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