ABSTRACT:Most studies on the PAFSIN pipes were oriented monitoring their behavior in laboratory conditions, focusing on the fluid and less influence on the environment laying on the mechanical properties in the short term then extrapolated mathematical term. Moreover, a large part of these studies refer only to the effect on PAFSIN composite samples without taking into account the specificities induced specific geometry pipeline. In this way, the effect PAFSIN pipes can be overlooked, which in practice can lead to significant errors of design and / or execution. Compared to existing studies, taking into account only the effect of a sealant (generally standardized solutions of acid or base) of the PAFSIN pipes, in the article to present the results of tests conducted on PAFSIN pipes buried in different types of land and attempted to surprise the complexity of the interactions of soil solution to the conduit. * Corresponding
Seismic activity of small, medium or high intensity has a destructive effect on existing water supply and distribution networks. In the scholar literature, these are included in Class I—Vital Performance Systems, whose operation must be uninterrupted in case of a seismic event. Water networks are also essential for the safe operation of certain critical subsystems in the event of an earthquake (fire-extinguishing systems, etc.), in order to avoid loss of human lives, reduce adverse environmental impacts and limit damage caused by fires. The article proposes a seismic safety system for the water transport pipelines obtained by designing, executing and testing an experimental design, a system that can be used to increase the seismic resilience of the water supply and distribution network pipelines. The experimental data obtained were verified on the basis of the theoretical data available in the literature. The results of the research are particularly useful and can be proposed for use from the stage of designing new networks to providing expertise for existing networks, for establishing the most-stressed areas in which to be installed, and for implementing both execution and at the same time rehabilitation and upgrading.
Influence of soil pH on the mechanical characteristics of glass reinforced plastic (GRP) pipes type was often investigated in different situations encountered in the field. GRP degradation is directly proportional to the exposure to soil with non-neutral reaction. The theoretical and experimental results lead during time to design standards, which allow the application of GRP pipes in water and soil, so as minimum interferences with the materials used in the manufacture of pipes would appear. Samples of GRP pipe of a certain size are buried in the different areas of the field where the pH is alkaline, acidic, or neutral. After 24 months, samples were dug up / recovered and then subjected to laboratory determinations in GRP pipe factory Subor in Turkey in July 2016, and in Dresden Amitech Factory Laboratory in September 2016. Some other analyses were performed in the OSPA, Iaşi, Romania Laboratory. For the analysis of such large volume of experimental data, we used the Pearson correlation coefficient. The dependencies among variables were quantified by proposing the index pipe damage. The degradation of the pipeline is directly proportional with the difference between the actual value of soil pH and the neutral pH value. The mechanism of degradation is different in basic and acidic soils. The results obtained in this study can be used in practice to avoid the negative effects of the types of land on GRP pipes behavior.
The lifetime of glass reinforced plastic pipes is 50 years. Extensive use of this type of pipe in its various applications, led to investigate their behavior in land that anthropogenic or natural causes, shows the different values of pH to neutral. The paper presents experimental results conducted on three samples of a PN SN10000 DN150 PN10 pipe buried in three different types of terrain: neutral, acidic, basic. They were subjected to axial load, measuring the force applied deformation force function. On the basis of the calculation formulas determined rigidity of the pipeline, the deformation speed of 50 mm / min. This concludes the type of land affects the rigidity of the pipe so its length of life decreases to that provided by suppliers in order to be taken compensatory measures in this regard such as choosing a higher class of pressure and stiffness pipeline than those arising discounted. This will allow for long-term value (50 years) in the mechanical characteristics sufficient for safe operation.
ABSTRACT:This paper aims at presenting a computational methodology for the seismic evaluation of steel pipelines networks, existing in the urban areas of Romania, characterized by an important seismic hazard. First, a short presentation of the state of the art of critical infrastructure composed of different classes of pipelines system, existing in urban areas, is given. In order to evaluate the seismic safety of existing urban piping network systems as well as different degrees of importance from a seismic design point of view, the paper presents a computational methodology based on Finite Element simulations. For the validation of the proposed methodology, a numerical case study has been performed, which aims to evaluate the seismic behavior of steel pipelines, as part of the network system existing in the North-Eastern region of Romania, characterized by a high seismic hazard. The numerical experiments based on Finite Element Analysis (FEA) methodology allows the evaluating of seismic safety of pipelines network, and can be further useful for monitoring critical infrastructure's components exposed to strong earthquakes during their
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