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UDC 621.643.2-034.13:532.5.011.18
Prodous O. A., Terekhov L. D.
Hydraulic characteristics of ductile iron socket pipes with inner polyurethane coating
Summary
The extensive use of ductile iron socket pipes with inner polyurethane coating in Europe proves their efficiency. In Russia such pipes have been also used. Pipelines with polyurethane coating combine the properties of plastic (they do not corrode, do not have scale) and metal pipe (high strength, lifetime and ability to endure high pressure) advantages. The roughness of the inner pipe surface effects significantly the resistance coefficient value along the length, i. e. the hydraulic characteristics of the pipelines. However up to now no studies of the roughness value of foreign-made polyurethane coating have been carried out. The authors of the article have conducted these studies. Based on the measured roughness parameters of the ductile iron socket pipe inner surface (manufactured by vonRoll hydro, Switzerland) with polyurethane coating the friction coefficient along the length was calculated. To estimate the capacity of pipes with polyurethane coating the hydraulic calculation is given (compared to the domestic pressure polyethylene pipes).
Key words
ductile iron , socket cast iron pipes , polyurethane coating , hydraulic characteristics
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УДК 628.17.001.4
Primin Oleg, Aliferenkov A. D., Otstavnov A. A.
Regulatory support of ductile iron pipe use in Russia
Summary
The integrity and environmental safety are among basic requirements imposed to the municipal water and wastewater systems. An appropriate choice of pipe material is of primary importance for ensuring water transportation pipeline integrity. For many years steel and cast iron have been the main pipe materials used in public water supply in Russia. Lately ductile iron pipes widely used overseas and in Russia, in the Moscow water supply system, in particular, have been competing with steel (metal) pipes. The wider use of ductile iron pipes in drinking water supply until recently was restrained by the lack of the proper regulatory framework, including general lack of instructions on the use of ductile iron pipes in Construction Rules 31.13330.2012 «Water supply. Public utilities» (Revised edition of Construction rules and regulations 2.04.02-84*). The information on these pipes and on the introduction of amendments to Construction Rules 31.13330.2012 related to the use in water supply systems, and also amendments to Construction Rules 66.13330.2011 «Design, construction pressure water pipelines and sewers with the use ductile iron pipes» in relation to their use in soft and subsiding soil is presented. The amendments were approved by the Ministry of Housing and Construction of Russia and put into force on April 30, 2015.
Key words
reliability , strength , pipeline , water and wastewater systems , ductile iron , set of rules
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UDC 628.144:621.644.073
Primin Oleg, Aliferenkov A. D., Ten A. E.
The use of ductile iron pipes in karsted areas
Summary
In providing for the integrity of water and wastewater pipelines the correct choice of pipe material is very important. For many years the main pipe materials in the public water supply systems in Russia have been steel and cast iron. Lately ductile iron pipes have competed with polymer and steel pipes. The wide use of ductile iron pipes in drinking water supply systems until later has been inhibited because of the lack of an adequate regulatory environment. Introducing amendments to Construction Rules 66.13330.2011 «Design, construction of pressure water and wastewater networks with the use of ductile iron pipes» related to the use of ductile iron pipes in karsted areas will enhance the volume of drinking water pipeline construction in difficult geological environment. The amendments have been adopted by the RF Ministry of Construction and will be put in force starting from August 5, 2017. Reducing the cost of constructing new and reconstructing the existing utility systems in karsted areas with the use ductile iron pipes is ensured by improving their life cycle, integrity, environmental safety and reducing water losses.
Key words
reliability , strength , pipeline , ductile iron , karsted territories , calculation
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UDC 628.143.004.67
Menshchikova O. A., Kurianov V. A., Maleyeva I. V.
Experimental construction of the water distribution pipelines with burst-lining technology
Summary
Laying ductile iron pipes by burst-lining technology is one of the perspective trenchless methods of water distribution network renovation. The positive results of the experimental works carried out in Zelenogradvodokanal Production Division on testing this technology with the purpose of identifying the actual type and level of possible damages of the outer surface of cast iron pipes are presented. The method of sliplining with old pipe bursting proved to be efficient, reliable and perspective for using in the existing urban developments.
Key words
water supply network , renovation , ductile iron , burst-lining
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