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UDC 621.644.075
Luferchik Ia. S., Avdeeva M. A.
Analysis of rehabilitation methods of pipelines of hydropower plant dehydrating systems
Summary
In modern fast developing cities it becomes more and more difficult to respond promptly to different defects of the utilities systems. This applies specially to large-scale infrastructure projects, e.g. hydropower plants. The difficulty of carrying out repair works involving excavation at the facilities is related to the placement of equipment and fittings, dehydration and drainage system pipeline route. Different methods of pipeline rehabilitation and upgrade eliminating excavation are considered; the technologies are described. The principle of the works execution is set. The analysis of rehabilitation methods was carried out. The expediency and efficiency of using the methods of rehabilitating pipelines of hydropower plant dehydrating systems was substantiated. To simplify the selection of the pipeline rehabilitation technology the comparative characteristic of the methods considered is given; their advantages and drawbacks are specified; the obtained data are tabulated for display purposes. The executed analysis showed that application of cement-sand mortar is the most expedient method of rehabilitating the pipelines of hydropower plants dehydrating systems in tough environment.
Key words
polyethylene pipes , utilities systems , hydropower plant dehydrating system , damage to pipelines , pipeline rehabilitation methods
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UDC 628.1/.2:621.644.075
Prodous O. A., Terekhov L. D.
Selection of polyethylene pipe grades for trenchless rehabilitation of water and wastewater pipelines
Summary
In the world practice different methods of trenchless rehabilitation of water and wastewater pipes are used. Selecting a method of trenchless rehabilitation is recommended solely after having compared the cost of the set of process equipment, its payback period and hydraulic characteristics of the pipeline before and after the rehabilitation. A method of substantiating the selection of polyethylene pipe grades for trenchless rehabilitation of water and wastewater pipelines is presented. The method of selecting the diameter of polyethylene pipes is as follows: for a certain pipe material the inner diameters of the pipeline under rehabilitation and pulled through polyethylene pipe are determined according to the existing standards; the ratio between the inner diameter of the pipeline of the section under rehabilitation and the outer diameter of the polyethylene pipe pulled through (by any method) should differ by only one standard size by grades; for comparison the hydraulic characteristics of the pipeline before and after the trenchless rehabilitation are determined by tables (handbooks); the cost of the process equipment, payback period and the hydraulic characteristics of the pipeline before and after the rehabilitation are compared. Thereafter the diameter of the pulled through polyethylene pipes is accepted. A comparative analysis of the hydraulic parameters for two methods of trenchless rehabilitation with the use of 160–400 mm diameter polyethylene pipes was carried out. The results of comparing the hydraulic characteristics of a pipeline in the process of rehabilitation with and without host pipe destruction are presented.
Key words
water supply , pipeline , trenchless repair , sewerage , polyethylene pipes , pressure losses
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UDC 628.1/.2:621.644.075
Kurtin A. V.
The use of polymer pipes in water supply and wastewater disposal systems of Irkutsk
Summary
Water supply and wastewater disposal systems in many Russian cities including Irkutsk are characterized by long term operation, high wear and failure rate. Rehabilitating obsolete water and wastewater networks, upgrading their parameters to the actual loading as well as meeting the current sanitary-hygienic regulations, technical and economic requirements have been the critical tasks that cannot be solved without the use of advanced technologies, materials, structures and devices. Using the example of Irkutsk city the use of trenchless technologies of water and wastewater networks construction and rehabilitation with polyethylene pipes is described. These technologies provide for reducing costs and water supply interruption periods, improving conditions of work, improving the integrity and seismic resistance of the pipelines and facilities. The practical experience proves the high technological and economic efficiency of this method. The data on the use of additional engineering tools for handling pipes made of different materials is given.
Key words
polyethylene pipes , repair and rehabilitation operations , water and wastewater systems upgrade , trenchless technologies , hydraulic bursting head , repair clamp , upset coupling
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UDC 628.356.1
Meshengisser Yu. M., Shchetinin A. I., Ostroushchenko N. G., Konnov V. N., Marchenko Yu. G., Mikhaylov V. K., Mikhaylov A. V., Minabutdinov A. S.
Aeration Systems of High Capacity
Summary
Design characteristics of aerators of high capacity produced by the Ecopolymer Group are presented. Comparing with other apparatus Ecopolymeraerators have the highest air flow capacity, in the process their mass-transfer characteristics remain at high level. An unique innovative toroidal AQUA-TOR aerator, which can easily substitute three standard 12-inch membrane aerators is described. An AQUA-TOR aerator membrane modification has been developed by the Ecopolymer Group in cooperation with SIF Patfil. The Ecopolymeraerators of various modifications – high efficient, reliable, having a long time of operation – operate in aeration tanks of any design and in wastewater of any composition.
Key words
aeration tank , aerator , air flow rate , mass-transfer properties , polyethylene pipes , dispersive elements
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UDC 628.144:532.542
Prodous O. A., Terekhov L. D.
Comparative evaluation of using charts by different authors for hydraulic calculation of pressure polyethylene pipelines
Summary
The results of hydraulic calculations carried out with the use of charts compiled by different authors are compared. The example of hydraulic calculations of a pipeline with a diameter of 160 mm for certain flow rate and pressure as well as the analysis of the hydraulic characteristics obtained from the charts by different authors for hydraulic calculations of pressure polyethylene pipes with practical conclusions are presented. The demand for such a comparison is driven by the inquiries from engineering companies busy with designing pressure polyethylene pipelines and experiencing difficulties with choosing the right charts for precise hydraulic calculations; and by the significant errors in the process of determining specific head losses along the length – hydraulic resistance that ultimately influences energy consumption of pumps during water transportation.
Key words
hydraulic design , polyethylene pipes , hydraulic resistance , specific head losses , calculation error
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