The purpose of this project was an intensive field survey of Latvian gas pipelines with the purpose of locating areas with coating defects as the pipe surface could have been and might still be exposed to corrosion from stray currents originating from a nearby DC-electrified railway and/or from lack of effective cathodic protection. The field survey had to be started as early as possible - before the oncoming winter. A second aim of the activities was know-how transfer combined with the delivery of a cathodic protection instrument package. This report also describes the outcome of an intensive survey, measurements of influence from the nearby DC-electrified railway, insulating flange measurements, soil resistivity measurements, anode bed resistance measurements and spot-checks of pipe potentials at different measuring posts, all carried out as part of the training. The scope of work has been: to examine the Sloka branch pipeline history and documentation, to locate areas of corrosion concern in the northern end of the pipeline, to provide Latvijas Gaze staff with cathodic protection measuring instruments and knowledge of how to use the instruments, to investigate the interaction from the nearby DC-electrified railway on the pipeline, as severe corrosion attacks were found on the pipeline, to state the condition of the cathodic protection and to give an explanation of the causes of the corrosion attacks on the pipeline, to give a recommendation on how to achieve effective cathodic protection. (EG)


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    Titel :

    Latvijas gaze. Inspection of pipeline. Final report. Cathodic protection, phase 2


    Erscheinungsdatum :

    1996


    Format / Umfang :

    29 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch