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An African first – 3m diameter dismantling joint

Klamflex designed and built a test-rig on-site to conduct a finite element analysis on the actual blank flanges to determine what the required thickness of the blank flanges should be to withstand 15-bar pressure.

A significant pipeline in southern Africa that is currently under construction is expected to accommodate the region’s growth water demand projected for 2030

As part of the construction of the more than 8km, 3,5m diameter pipeline, a number of innovative technologies have been required for what is said to be sub-Saharan Africa’s largest water pipeline. One of these was the design, manufacturing, and testing of a 3m dismantling joint.

This article provides details of the overall requirement in terms of the supply, delivery, and testing of the electromagnetic flow meter. To account for the water that is to be extracted from the Vaal Dam, one of the most accurate technologies for measuring raw water - the electromagnetic flow meter was chosen. A tender document was put out to the open market and Krohne South Africa was selected to supply the electromagnetic flow meter, including the dismantling joint and all the other accessories required.

About the flow meter

Deon Rampathi, projects and logistics manager of Krohne South Africa, who placed the order with South African company Klamflex Pipe Couplings for the dismantling joint, explained the background for the project, “the pipeline itself is 3,5m in diameter, but the section where the flow meter has been installed is 3m in diameter and therefore the size of the line at that point has been reduced,” he said.

The specifications of this flow meter are an internal diameter of 3 002mm, with a maximum flow rate of 900Mℓ/day, thus not only making it the largest of its kind in the world, but also a first in Africa. “This is the tenth, 3m flow meter that Krohne has manufactured,” commented Rampathi.

Read the full feature in the March 2014 issue of Plumbing Africa, page 47

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