USS PRINCETON (CG59): Microbiologically Influenced Corrosion (MIC) and Macrofouling Status of Seawater Piping Systems
Technical rept. 23 Jan-25 May 1990
NAVAL SURFACE WARFARE CENTER DAHLGREN VA
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This report summarizes the microfouling and macrofouling within the seawater piping system of the USS PRINCETON CG59 and assesses their contribution to the failurescorrosion problems observed. Sulfate reducing bacteria SRB were isolated from two test areas of the seawater piping system. Biofilms containing SRB are known to cause corrosion problems in a wide variety of materials. Therefore, longterm monitoring for SRB and microbiologically influenced corrosion MIC problems from SRB in the sea chest andor copper- nickel seawater piping systems was recommended. The macrofouling problems were due to the marine mussel, Mytilus edulis, and hydroids. Hydroids animals formed dense, plant-like colonies. Copper from the copper-nickel seawater piping gives the hydroids a green color so that they have the appearance of seaweed. Shrimp, crab, sponges, other unidentified crustaceans and fouling deposits were observed by a fiber optics examination in the main sea chest. Due to the observed failurescorrosion problems and the extent of the macrofouling in the seawater piping system, an environmentally safe, thermal steam control method for the macrofouling was recommended. Without a biofouling control procedure, failurescorrosion problems as observed in CG 59 seawater piping systems are likely to occur.