Modern sewer pipeline completed

No more health threat for residents

Contractors coupling the 1000 mm diameter steel-reinforced spirally wound HDPE sewer pipes onsite
Corroded sewer pipeline
The Ekurhuleni Metropolitan Municipality has just successfully completed a R13-million emergency sewer upgrade in the Klippoortjie area after the area was declared a disaster zone earlier this year, following considerable leakages in the existing and outdated pipeline, posing serious health risks for nearby residents.

Leading fluid conveyance solutions supplier Incledon was contacted in April to urgently supply more than 1 600 metres of 1 000 millimetre diameter steel-reinforced spirally wound high-density polyethylene (HDPE) sewer pipes to replace the  concrete pipeline. Installed in 1935, the old pipeline had to be replaced after severe corrosion due to toxic gases created by the raw sewerage, which had begun to spill onto residential and agricultural land.

According to Ekurhuleni Municipality engineering technologist, Oupa Matshate, the area was immediately declared a disaster zone in early April, following the spillage of the sewerage, which created serious health and safety concerns for residents in the area. 

“At the time of installation, concrete pipes were recognised as the best material for sewerage pipes. After more than 75 years, however, the concrete had been corroded as a result of prolonged exposure to toxic gases such as hydrogen sulphide, methane and carbon monoxide,” says Matshate. 

This time round, the municipality chose high-quality steel-reinforced spirally wound HDPE piping from Amanzi Starway as the product of choice, due to the fact that polyethylene is a non-polar high-molecular weight hydrocarbon that is highly-resistant to chemicals, salts, acids, and alkalis.

Due to its high ring stiffness and axial flexibility of spiral reinforced HDPE pipe, the  steel reinforced HDPE pipe is able to relieve the excessive stress caused by soil settlement, groundwater floating and excessive loads through elastic deformation, which prevents leakage and damage at the joints. 

“The pipes are considerably lighter than a large number of alternative materials available, thereby easing the process of transport and installation, and reducing the overhead costs,” says Matshate.

According to Incledon’s head of infrastructure, Ian Geldard, the pipes are manufactured with a steel reinforced polyethylene profile that is formed by integrating HDPE with steel strips by means of an integration machine, which allows for ring stiffness rating up to 8, 10, and 12,5 kN/m2. “The profiles are spirally wound and fusion-welded by HDPE melt at the profile edges, which is overlapped by a winding and welding machine to form the pipe. This pipe is of a spiral structure with concentric steel reinforced HDPE ribs, which are equidistantly distributed around the circumference of the pipe, extending vertically outward from the basic pipe body,” says Geldard.

The Klippoortjie pipeline project was divided into three phases, with all contract work completed by Baatshuma Electrical within one month. 

“The first phase of the project involved the installation of 425 metres of piping, while the second phase saw 777 metres of piping installed, and phase 3 had an additional 2 700 metres laid. The sewer pipeline was impressively installed to urgent deadlines, while still maintaining the highest standards of quality and workmanship on a consistent and around-the-clock basis.”

Matshate has hailed the Klippoortjie emergency sewer upgrade project an overwhelming success. “A good working synergy between all parties involved has ensured the swift and professional installation of a world-class sewer line, and the complete transformation of a disaster zone. We will now be working closely with a number of additional partners to monitor the state of the environment that was affected by the leakage, and will undertake long-term rehabilitation measures when and where necessary,” Matshate concludes.
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This edition

Issue 68