This master thesis has been divided into two separate, but thematically connected parts, of which the first has served as a theoretical introduction and the second as the description of the experimental methods. The corrosion and its division into electrochemical and chemical corrosion, have been studied in details in the first part of the thesis, as well as the factor that affects on the creation of the corrosion in gas, and the gas network itself. As the choice of the material that is used in making the pipelines in the gas network are PEHD and steal seamless pipes. But nowadays PEHD pipes are more commonly used. Corrosion can have numerous harmful effects on the environment and human beings, with possible lethal consequences on human life. Due to that fact, the gas line has to be adequately protected to avoid above mentioned states. This process of protection is assured with cathode protection, insulation for flat parts of pipeline, polyethylene ribbons and coatings. In the second, experimental part of thesis, it has been studied the possible situation of pipeline failure or brake. Possible consequences for the pipeline itself and for the human life, have been described taking into consideration different distances of the failure from the main pipeline. Natural disasters in the area of Osijek that can lead to gas pipeline failure or brake, such as earthquakes, floods, storms and waterspouts, have been studied towards the end of this master theses, and based on the collected data, certain conclusions have been drawn. It has also been noted that throughout the whole pipeline has been applied cathode protection, and that it is necessary to regularly review it and maintain it.