1. What is the chemical cleaning?

          A process which stabilizes the object at the passive state after eliminating alien      substances using proper chemicals depending on material, kinds of the fluid,
          conditions and status of the process to prevent possible dangers during operation,
          to extend durability of machines/facilities, and to maximize efficeuncy.

       

     
    2. Effects of Chemical Cleaning

          - eliminating an impurities
           - maintaining the purity of products
           - maximizing the durability of facilities
           - enhancing the efficiency
           - minimizing the repairment
           - minimizing the defects

     

     

       ( Equipment facility and Chemical filing )

    3. Process of Chemical cleaning

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    4. Operation of chemical cleaning  

     

    Initial cleaning

    Regular cleaning

    Purpose

         Mill Scale, Dust
         To eliminate Welding fragment, oil      and fats

       To eliminate oxidized   steel on boiler (Fe2O3, Fe3O4, Mg,   etc.) and FeS, S, C on Oil

    Alkali
    Cleaning Chemical 

         Changed according to cleaning process
          NaOH
         Na    3PO4
          Na2CO3
         Na    2O3
         S    urface active
         Agent
             Other needed chemical

       Necessary density
       operation according to the
       needs

    Acid cleaning chemical

     

         Organic acid or Inorganic acid      Inhibitor(organic acid or Inorganic acid)
                     0.1%-0.5%  
         Swelling - I(Activator)
         Swelling - K(Copper ion blocking Agent)
         Swelling - S(R    educing gent)
         Swelling - N(Nonion Surface Agent)
         Others

       Necessary density

    Passivation
    Ageng
    (Anti-rust Chemicals)

    KS - 44
    K -41   
    Ammnoia
    Hydrazine hydrate
    Anti-rust products
    O    ther

       Necessary density
       Necessary density
       Necessary density
           Operation according to
       Needs
       Operation according to
       Needs 

    Neutalization of waste fluid

         Acid or Alkali  
         Anti-Foamer     

        Operation according to
        needs

    preparation
    Against Leak

    Na2CO3

        Needed quantity