Critical analysis of laboratory measurements and monitoring system of water-pipe network corrosion-case study.

Case study of corrosion failure of urban water supply system caused by environmental factors was presented. Nowadays corrosion monitoring of water distribution systems is an object of major concern. There is possibility of application broad range of techniques like gravimetric and electrochemical. Both kinds of techniques can be applied in laboratory and field conditions. In many cases researches limit the case analysis to measurements in laboratory conditions. Presented work contain critical analysis of results obtained in laboratory and field conditions based on corrosion monitoring of three pipelines systems failure in Krakow

Electrolytic corrosion of water pipeline system in the remote distance from stray currents—Case study

AbstractCase study of corrosion failure of urban water supply system caused by the harmful effects of stray currents was presented. The failure occurred at a site distant from the sources of these currents namely the tramway and railway traction systems. Diagnosis revealed the stray currents flow to pipeline over a remote distance of 800/1000m from the point of failure. At the point of failure stray currents flowed from the pipeline to the ground through external insulation defects, causing the process of electrolytic corrosion of the metal. Long distance between the affected section of the pipeline and the sources of stray currents excludes the typical protection against stray currents in the form of electrical polarized drainage. Corrosion protection at this point can be achieved by using the earthing electrodes made of magnesium, which will also provide cathodic current protection as galvanic anode

Research on causes of corrosion in the municipal water supply system

This paper presents results of failure analysis study to characterize the corrosion damage that occurred in the water supply system in Krakow. This analysis includes: electrochemical noise, linear polarization and resistometric measurements. Water aggressiveness of four water intakes was defined using Langelier and Ryznar indices. Results from this indices did not reveal the causes of considerable corrosion losses in water systems. The corrosion rate measurements revealed that water from the one of water intakes is characterized by considerable corrosive aggression. In all studied water subsystems formation of protective layers limiting the corrosion rate was found. Overall analysis reveal the need to implement a on-line corrosion rate monitoring in the water supply system of the city of Krakow

History trumps government unpopularity: the June 2003 Polish EU accession referendum

This analysis explains why Poles voted overwhelmingly to join the EU and how the 50% turnout requirement was achieved fairly easily. It argues that most Poles appeared to accept the historical significance of the referendum and de-coupled the issue of EU membership from that of confidence in an extremely unpopular government. This occurred because most key political and social actors, including the opposition parties, called for a Yes vote, while, at the same time, a vigorous campaign by pro-EU civic organisations presented a ‘non-political’ face to the campaign. Although the No camp made tactical errors and had difficulties staying focused on its main arguments, lack of both access to the public media and a convincing or attractive alternative made it extremely difficult for them to mount an effective campaign. At the same time, the stability of the opinion polls in the years leading up to the referendum suggested that most Poles had already made their minds up about the issue well in advance. In spite of the low levels of trust in political parties, partisan cues appeared to be a better predictor of referendum voting behaviour than socio-economic and demographic factors