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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...calcareous scalecalcareous scale
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12/7/2005 9:00 AM
 
HI their Could any one hear about the calcareous scale that deposit at the sea water heat exchange tubes? The tubes service is sea water. If yes is their any to dissolve since we are tried many chemical type but still very hard and plug the tubes. David
 
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6/26/2006 9:00 AM
 
Did you tried hydrochloric acid?
 
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6/26/2006 9:00 AM
 
Cold commercial grade H2SO4 can dissolve or loosen most organic substances. A Mix of conc. H2SO4 + conc. H3PO4 + K2Cr2O7 can also be tried out. regards DM
 
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9/13/2006 9:00 AM
 
The calcareoous scale is probably calcium hydroxide, a moderately strong base. It will react with acids, and this is a usual procedure in its removal. if the material is forming inside high pressure tubes, be careful with acid application; ensure the pressure is completely relieved before treatment. Typically, the formation of this scale is associated with a galvanic problem, although the movement of seawater through enclosed pipes under pressure will also cause the problem. The condition is exacerbated by heat. Cleaning requires the same procedures and materials in either case. I have good success in cleaning most bronzes with muriatic acid (30% hydrochloric acid solution). In other applications, such as stainless or hi-tensile steels, I suggest laboratory experimentation to determine a safe removal acid before actual application, if this is possible. Chuck
 
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