LARGE DIAMETER PIPE | MACHINERY
Economy of scale: large diameter pipe
A combination of toughness and light weight makes plastic pipes – especially those of large diameter – easier to install and longer lasting than their equivalents made from traditional materials
The growth in infrastructure projects – and the gradual move away from traditional materials – has increased the demand for large diameter plastic pipe.
One ongoing project in Ashkelon in Israel, for
instance, is using large diameter PE100 pipes – made using equipment from Krah of Germany – to replace existing pipes in a wastewater system. The current pipeline runs for 3.6km, and is constructed from 48in asbestos cement pipe. This is being replaced by the new pipe – DN/ID 1500mm HDPE pipe, with a ring stiffness of SN8 according to ISO9969. The material is flexible, impact resistant and lighter than traditional rigid pipe materials, says the company. The pipeline is installed at a depth of up to 6m.
Groundwater levels could be higher than this, so the piping system must be leak-tight. The customer requires a long service life without any leaks or failures. If the pipe system leaks, infiltration and exfiltration can occur, causing damage to the piping
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system and the environment. In this case infiltration was the customer’s main concern – and could occur due to defective pipe joints or broken pipes. An important issue was to clarify which type of jointing would prevent pipe failure and disconnec- tion. Traditional rubber ring sealing is leak-tight when installed correctly, but soil movement can affect this. For this reason, the pipe manufacturer, Plassim Infrastructures, recommended the use of HDPE Krah pipe with integrated electro-fusion joints according to the DVS2207 standard. The electro-fusion socket is an efficient way of joining large bore PE pipes. “This type of connection is considered to create an absolutely leak-tight joint, which assures a completely homogenous piping system with a long service life of at least 100 years,” said Gadi Yahav, chief engineer for piping systems at Plassim. As well as replacing the existing cement pipe, a
further 3.6km of HDPE pipe will be laid to provide additional capacity for the expanding town.
� July/August 2018 | PIPE & PROFILE EXTRUSION 37
Main image: ADS supplied large corru- gated pipe for a storm water drainage system in South Carolina
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