1 . Other systems independent of the evaporator is disconnected.

2 . Open-side high water evaporator blowdown valve and the steam-side low lead leaching valve to ensure that a large number of purge gas produced during the reaction can be discharged in time and the washing liquid fullness; valve while monitoring the cleaning process by changing lead leaching Leakage of the copper pipe of the heater. 3 . In order to corrosion monitoring system and the cleaning effect of the cleaning process apparatus, before cleaning the construction, the device equivalent to the standard corrosion test strip material, respectively, suspended from the pipe section monitoring cleaning bath.

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