The concept of connecting large-diameter pipes by the electrofusion welding using couplings with tapered cuffs is considered. Practical aspects of the coupling of such pipes are described. In particular, the reasons for the in-crease in requirements to the quality of welded joints with the enlargement of the pipe diameter are stated. The design of the coupling with tapered cuffs, as well as the assembly technique of this type of coupling is consid-ered. Two technologies – the electrofusion welding of large-diameter pipes using cylindrical couplings, and the electrofusion welding of pipes by means of couplings with tapered cuffs – are compared. In conclusion, a list of the European regulations on which the welds made by means of couplings with tapered cuffs are tested, is given.
PE pipes, welding with embedded heaters, tapered cuffs, internal coupling armoring, pipeline systems, coupling technique for large-diameter pipes.
Введение. Использование на практике соединений с коническими манжетами привело к революционным изменениям в технологии соединения труб большого диаметра.Технологичность нового соединения стала на порядок выше, чем у традиционных цилиндрических муфт.При этом достигается устойчиво высокое качество сварки,а сам процесс выполняется очень быстропо ясным и простым правилам.Любой специалист, знакомый со сборкой фланцев, может работать и с коническими зажимными манжетами.
1. DVGW GW 335-B2:2004-09 «Kunststoff-Rohrleitungssysteme in der Gas- und Wasser - verteilung; Anforderungen und Prüfungen - Teil B2: Formstücke aus PE 80 und PE 100».
2. EN 12201-3:2011 «Plastics piping systems for water supply, and for drainage and sewerage under pressure - Polyethylene (PE). Part 3: Fittings”.
3. EN 12201-5:2011 «Plastics piping systems for water supply, and for drainage and sewerage under pressure - Polyethylene (PE). Part 5: Fitness for purpose of the system”.
4. ISO 4427-3:2007 «Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply. Part 3: Fittings
5. ISO 4427-5:2007 «Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply. Part 5: Fitness for purpose of the system».
