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97414 THE SACRIFICIAL CATHODIC PROTECTION OF UNS C71500 HEAT EXCHANGER TUBES IN ARABIAN GULF SEA WATER

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Product Number: 51300-97414-SG
ISBN: 97414 1997 CP
Author: A. Al-Hashem, J. A. Carew, A. Al-Sayegh
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A laboratory investigation using a specially designed circulating test rig was carried out to study the effectiveness of achieving complete cathodic protection of UNS C71500 heat exchanger tubes in seawater applications. Results indicated that the galvanic current distribution covered the entire 6m length of the tube. The presence of sulphide ions as pollutants in seawater shifted the galvanic potentials of the tubes to more active potentials and prevented the formation of protective films that normally form. Keywords: Sacrificial Protection, Galvanic Coupling, Heat Exchanger, Carbon Steel, UNS C71500 Alloy Tubes, Seawater and Sulfide Ions Pollutants
A laboratory investigation using a specially designed circulating test rig was carried out to study the effectiveness of achieving complete cathodic protection of UNS C71500 heat exchanger tubes in seawater applications. Results indicated that the galvanic current distribution covered the entire 6m length of the tube. The presence of sulphide ions as pollutants in seawater shifted the galvanic potentials of the tubes to more active potentials and prevented the formation of protective films that normally form. Keywords: Sacrificial Protection, Galvanic Coupling, Heat Exchanger, Carbon Steel, UNS C71500 Alloy Tubes, Seawater and Sulfide Ions Pollutants
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ISBN: 09520 2009 CP
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How calcareous deposits formation in seawater influences the performance of a galvanic cathodic protection (CP) system in seawater. Coupling current measured.  A resistance set between the cathode and the anode simulated circuit resistance of CP. Steel cathode potential over immersion time. Calcareous deposits analyzed by X-Ray Diffraction.
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