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Abstract
This paper presents investigation results of the influence of gas microbes on the biocorrosion rate of the materials used for gas pipelines construction in the Lodz Province. Samples of two types of carbon steel and cast iron were stored in the laboratory pipeline model reflecting the real conditions of working natural gas pipelines were. In the next step the influence of cathodic protection with parameters recommended for protection of underground structures was tested. Analyses of biological corrosion products generated on the test surface were carried out using a scanning electron microscope with an X-ray analyzer. The level of ATP was measured to confirm presence of the adsorbed microorganisms on the observed structures. Corrosion rates were determined by gravimetric methods. In the course of the study it was revealed that the rate of biocorrosion of steel is lower than that for cast iron. Our results also proved that the weight corrosion rate depends on the number of adhered microorganisms. In addition, it has been found that application of the carbon steel cathodic protection decreases its weight corrosion rate. The information obtained will help to increase the knowledge on the rate of biological corrosion causing losses/pits inside gas pipline.
Highlights
As a result of technological progress, rise in the living standards and broadly understood economic development, increasing usage of the electric energy is observed
This paper presents the influence of the microorganisms on materials constructing gas pipelines in the Lodz Province
Samples were collected from two carbon steel pipelines (S1 and S2) in the Lodz province, what allowed to use in this study microbes naturally inhabiting a gas pipelines of this region
Summary
As a result of technological progress, rise in the living standards and broadly understood economic development, increasing usage of the electric energy is observed. Some of newer regulations, e.g. in the EU concerning the climate, require decrease of the usage of the fossil fuels for the electricity production This promotes an increase in usage of the natural gas, which stands out among others conventional fuels due to its low greenhouse gas emissions (see Table 1) and high calorific value. Even with ongoing investments in the construction of new gas lines, they are not able to compensate the aging transmission grid. This results in the fact that about 60% of the operating gas pipelines are 30 years old [6]
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