RISK OF THE UNDERGROUND STEEL STRUCTURES BIO-CORROSIVE PROCESSES ASSESSING METHOD

FIELD: transportation.SUBSTANCE: invention relates to the field of pipeline transport, in particular, to the bio-corrosion studies under laboratory and field conditions on the pipelines outer surface and the soil bio-corrosive aggressiveness assessing in the main oil pipelines and oil product pipelines (MNPP) laying areas, taking into account the most significant environmental factors affecting the microbiocoenosis formation. Risk of bio-corrosive processes in underground steel structures assessing method is characterized by the fact that determining the humidity in the soil, the soil mineral composition, soil specific electrical resistance (SER), soil oxidation-reduction potential (ORP), soil pH, total number of the aerobic bacteria (AB), total number of the micro fungi (micromycetes) (MF), individual classes of microorganisms, sulfate reducing bacteria (SRB), iron bacteria of bacteria (IB), after which the soil aggressiveness coefficient (SAC) is calculated by the formula: K=K*K*K*K, where Kis the coefficient taking into account of the soil mineral composition, which is calculated by the formula: K=K*K*K*K*K, where Kis coefficient taking into account of the sulfate ions content; Kis coefficient taking into account of the carbonate ions content; Kis coefficient taking into account of the chlorine ions content; Kis coefficient taking into account of the sulfides content; Kis coefficient taking into account of the iron content, where Kis coefficient taking into account of the main groups of microorganisms content, which is calculated by the formula: K=K*K*K*K, where Kis coefficient taking into account of the sulfate-reducing bacteria content; Kis coefficient taking into account of the iron bacteria content; Kis coefficient taking into account of the aerobic bacteria content; Kis coefficient taking into account of the micro-fungi (micromycetes) content, where Kis coefficient taking into account of the soil electrochemical parameters, which is calculated by the formula: K=K*K*K, where Kis coefficient taking into account of the pH effect; Kis coefficient taking into account of the redox potential magnitude; Kis coefficient taking into account of the soil moisture amount: where Kis coefficient taking into account of the soil electrical resistivity value, at that, depending on the measured indicators values, to each of the K, K, K, K, K, K, K, K, K, K, K, K, K, K, K, Kcoefficients a value from 1 to n is assigned, and the risk of the soil bio-corrosive aggressive