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The Corrosion Forum: What is the Cathodic Protection Criteria(s) for protection of underground facilities

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    • CommentAuthorDr. Zee
    • CommentTimeJan 28th 2007 edited
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    The following are cathodic protection criteria(s) commonly used. It is important to consider IR potential drop in all field measurments.

    a) 850 mV vs CuCuSO4 NACE criteria for coated structures

    b) 100 mV Shift Uncoated pipelines

    c) Tafel Criteria-Tafel criteria is determined by polarization: The protection current is determined from the bend in the current density vs potential curve which can be obtained by a drainage test in the field or in the laboratory if feasible.

    d) -300 mV no longer in common use due to field limitations

    e) -100mV Stainless steel structures: for neutral waters/low corrosive soil and -300mV For chloride containing solutions (Hot)

    Most underground structures can be protected by CP. However, In all cathodic protection applications both hydrogen(damage, HE) problems and OH induced corrosion should be considered prior to design and installation. NACE Certified Corrosion/Cathodic Protection Specialist should be consulted for underground fuel facilities.
    • CommentAuthorshezi
    • CommentTimeJul 2nd 2007
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    Gas pipe line are also layed so what is the life of that pipe ? And in gas pipe line which kind of different current used to save underground pipe ?
    • CommentAuthorshezi
    • CommentTimeJul 2nd 2007
     permalink
    Gas pipe line are also layed underground so what is the life of that pipe and on what basis we set the particular time of that pipe? And in gas pipe line which kind of different current used to save underground pipe ?

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