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Two types of impressed current cathodic protection and a sacrificial method were used to protect over 100000m2 of reinforced concrete caissons and deck slab of a new ship repair yard. This paper describes the CP and monitoring systems used and compares the monitoring results from the different types of system and probe.
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An effective and efficient impressed cathodic protection system by laying a continuous shallow anodes bed in close proximity to the tank foundation. Some of the merits of this installation include elimination of shielding effects or interference from other structures and uniform protection of the entire tank bottom.
This paper develops the relationships between proton reduction at the surface of metals, and hydrogen evolution or hydrogen diffusion into the metal.
The aim of this study was to determine the mechanism of atmospheric corrosion of zinc in areas of local NaCl contamination and to define the driving force of spreading of electrochemical reactions using Scanning Kelvin Probe (SKP).
There is big initial and small mean current density for offshore platforms. Sometimes the former is twice of the latter. DNV-RP-B401 suggests minimizing anode size and density. NACE-RP-0176 recommends utilizing more anodes. This paper introduces a new method by wing section sacrificial anode with large surface area in the initial period.
A model is developed to simulate electrolytic coupling between the carrier and casing pipe in a cased crossing, and to estimate diversion of the cathodic protection current from the rest of the pipeline for a given set of conditions.
This paper will focus on design parameters required for cathodic protection (CP) of stainless steel screens with particular attention on design and operational current density values and suitable protection criteria. The detrimental effects of overprotection will also be discussed.
By implementing Automated Waveform Analysis during CP surveys, operators of structures using CP systems can accurately and consistently record CP data to better assess their level of protection.
Specific challenges encountered in the application of CP to thermally insulated pipeline risers in northern Alberta (Canada). The CP issues resulting from the use and installation of thermal insulation, resistance heating (heat trace), and other instrumentation are discussed.
Temperature effect on cathodic protection (CP) design current density was examined by electrochemical tests, and a case study of optimized CP design for the FPSO (Floating Production Storage and Offloading) using a computational analysis tool was performed.
For reinforced concrete (RC) structures that are in drier locations but still need of cathodic protection (CP), impressed current cathodic protection (ICCP) systems are preferred. In this study, the performance of activated zinc anodes installed on dry or high resistance concrete on Florida Bridges was evaluated.
Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.