Total Net Present Value Costs:
Benefits. A significant benefit of utilizing cathodic protection
is that, at the end of the economic life of the structure, the structure
remains in functional condition and can be maintained in that condition
essentially indefinitely at low cost.
Alternative 1 - Net present value = 4,764
Alternative 2 - Net present value = 1,022
Alternative 3 - Net present value = 0,288
Alternative 2, steel line with cathodic protection, suggests the least life-
cycle cost proposal.
Economic Analysis - Example 2
Install a fuel pipeline, 8 inches in diameter and
15,000 feet long.
Steel line without cathodic protection.
Steel line with cathodic protection.
a) The soil resistivity is equal to 5,000 ohm-cm, pH 6, which is a
moderately aggressive corrosion environment.
b) The economic life of a fuel pipeline is 25 years. It is
assumed that no salvage value will be remitted in year 25 unless total
replacement is cost justified at that point in time.