Tabanelli, Gulminelli
# 2008 Budapest
Structured wall plastic pipes (double wall with corrugated external wall) are widely used for underground sewage drains. Socket joints, integrated onto the pipes themselves, are the most commonly used junction system. With PVC-U pipes, the socket is normally thermoformed in the corrugated wall by a specific belling machine. Other systems, such as coupling collars, socket formed directly by the corrugator, sockets injection-moulded onto the pipe or sockets welded onto the pipe, are not economically or technically competitive in comparison to sockets thermoformed onto the corrugated wall of the pipe. Thermoforming (also called socketing or belling) has only recently been introduced in industrial plants producing pipes in PP and HDPE, with a system that has resolved complex problems concerning the structural integrity of the wall shape and dimensional stability. In addition to the evident advantages already demonstrated with PVC pipes, the system introduces new rules for designing the geometry of the pipe wall and promises further developments towards optimized walls to obtain reduced weight, improved rigidity, strength and socketability with thermoforming.
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Author(s) : Giorgio Tabanelli
In underground plastic drainage pipes the integrated socket joint technology is now used widely in PVC pipes with a compact or multilayer wall. On the other hand, in PP and HDPE pipes this form of connection, despite its well-known advantages, is still not widely used. The reason for this is basically due to the...
Author(s) : Giorgio Tabanelli and Marco Gulminelli
Piping systems for indoor sewage usually use PP and PVC-U socketed pipes with diameters no greater than 160 mm [6.30"]. The pipes are short in length in comparison to pipes used in outdoor sewage or in pressurised water distribution networks. Pipes less than three metres in length are produced, and there is...
Author(s) : Tabanelli
In polyethylene piping systems for conveying pressurised water the use of socket systems for pipe joining is relatively uncommon. This is because the significant thickness of the pipe walls makes the system for thermoforming of the socket at the pipe end complex and economically unattractive. Only recently...
Author(s) : Tabanelli
Given the same operational pressure, the required thickness of molecularly oriented PVC pipes is 35-40% less than for PVC-U pipes. This is one of the various advantages of the material, which is interesting an increasing number of producers. The technical and commercial success of PVC-O pressure pipes relies heavily...
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