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The resistance of steel pipes has an important impact on their quality and has a great impact on the price of pipes, including the price of galvanized pipes .
In the investigation of pipeline failure, two types of mechanisms can be considered, the first type which refers more to the passage of certain loadings than a resistance criterion and the second type includes gradual structural failure .
Of course, this kind of division is applicable to almost any structure . However, considering the significant contribution of each of the two species mentioned in the overall process of pipeline failure, it is necessary to pay as much attention to each one as needed . The effect of earthquake is divided into two general categories :
1.First, the effects of ground movement due to the propagation of waves .
2.Second, the effects of lasting displacement on earth .
The consensus of research in this type of division is due to the relatively specific boundary in how these two mechanisms work in imposing failures on pipelines .
Corrosion in metals can be divided into three categories. First, the overall corrosion that occurs due to the uniform relationship of the metal with an electrolyte, resulting in the uniform wear of the metal in the range of it .
Another type of corrosion is caused by contact between two metals with different capabilities in electron loss and in fact gives a tool to protect the structure with cathodic protection method .
Finally, the third type of corrosion is caused when the corrosion rate is higher in limited levels of metal. As a turn, this type of corrosion appears as holes in the metal .
It can be observed that although the type of corrosion performance is not structurally important, but the results of different microscopic functions in the structure ultimately provide structures with different properties .
In some pipes such as galvanized pipe, some measures have been taken to reduce corrosion, which affects the price of this product, but some pipes have no resistance to corrosion and therefore their prices are also lower .
In general, factors affecting the longevity of the pipe against corrosion can be summarized in the characteristics of materials transmitted by the pipe, the characteristics of the external environment (such as soil Ph and moisture content) working conditions (such as temperature and speed of material passage) and maintenance quality. Corrosion factors can form a long list of chemical and physical properties of pipes and environments .
Even the growth of microorganisms in the inner wall of the pipe , which is carried along with materials such as natural gas, can destroy steel pipes by producing organic acids or sulfur, all of which affect the price of gas and oil pipes. Therefore, in the resistance study of pipes, in addition to general research on corrosion factors, it is necessary to judge locally .
For example, the amount of moisture or accompaniment of H2S or oxygen gas with the transmitted materials is one of the criteria for internal corrosion of the pipe, but the density of these materials is not constant during the lifetime of the structure and finding different patterns of production of these materials in the main source creates different lifespans for the pipe. Although the study of corrosion factors is extensive, statistical studies provide a suitable boundary for structural conclusions regardless of microscopic view of corrosion phenomenon .
Corrosion rate plays an important role in estimating the structural condition after a certain time. Corrosion growth is usually considered linear. However, the study of corrosion data shows the linear growth of corrosion dimensions in a large part of the pipe's lifetime. In the study of corrosion phenomenon, two types of growth are generally considered : radial growth and deep growth .
In this section, two general views on the failure of pipes affected by transient displacements of the earth are taken into consideration .
Another approach to estimate the damage of buried pipes is to use the statistics of past earthquakes . It should be noted that in the path taken up to recent researches, the functions of destruction have gradually expanded rather than expanding based on the intensity and maximum acceleration of the earth in terms of the maximum speed of the earth .
Ahan Pouya with more than a decade of best-selling experience, adheres to professional and ethical principles in the field of selling and buying at inside and outside the borders of Iran, helping you in the steel industry.
