Spiral Welded Steel Pipes in Municipal Applications

The issue of water security for South Africa not only circumscribes the entire water sector but also has far-reaching consequences across the entire economy of South Africa. It touches on the growth and development of all sectors of our economy. In the context of the Department of Water and Sanitation’s master plan, water security touches on many facets, including identifying future water sources for our growing population and the attendant future water resources development options, the operation and maintenance of water and sanitation infrastructure, the proper management of our water quality, Water Supply Services, resilience of our country to Climate Change Impacts and Water Conservation and Water Demand Management.

The rollout of water and sanitation infrastructure is a key step towards the realisation of ensuring water security and availability in our communities and has a plethora of value-added opportunities addressing employment, industrialisation, manufacturing, localisation, and designation of material.

Spiral welded pipe is a 100% designated product as per treasury designated sector circular no.4 of 2017/2018 and a product that is suitably applicable in municipal piping applications for the conveyance of water. Spiral welded pipe has been used extensively by many municipalities and metros in their water infrastructure projects with great success and sustainability. Examples of but a few municipal projects are as follows:
• TCTA – Vaal River Eastern Subsection – 125km water line. OD: 1 930mm – X42, X52 & X65. Sintakote® coating.
• eThekwini Water and Sanitation – 70km Western Aqueduct: OD: 610mm – 1 600mm Sintakote® coating.
• Komati Water Supply Augmentation Scheme – 70km water line OD 813mm & 1 118mm – API X42 & X52.
• N10 Pipeline (Bloemendal – Delmas) – 37km water line OD 610mm – API X42.
• Umbumbulu Water scheme – 25km water line OD 457mm – API X42.

Spiral welded pipe is designated because it can and is readily manufactured in South Africa, sufficiently meeting all local demand and in many ways superior to imported products designed to serve a similar purpose, providing the design engineer to fully engineer a project to very specific needs.

Fully engineered system

The versatility and strength of spiral welded steel pipes enable customized performance-based designs to meet the criteria specified. Unlike other imported products that have been used by some municipalities, the type of steel can be selected to meet the specific strength and other physical/mechanical properties that are needed for a given application. The imported products can only be regarded as commodities as they limit the ability of a design engineer to engineer to specific needs.

The ability to fully engineer a steel pipe system, from the necessary wall thickness from 4.5mm to 20mm, to the type of integral jointing system needed, to the specific type of lining and coating based on the nature of the soils in which it is buried and the fluid it transports, to the inside-diameter required, make it one of the most versatile products available for use in Municipal applications.

The most critical water projects for many decades in South Africa where potable water is in high demand and must be transported from remote locations, have either used spiral welded steel pipes or have had steel pipe as a construction option. Availability of spiral welded steel pipes in sizes 20” to 100-inch diameters makes them ideal for critical water transmission projects. Of course, the ability to fully engineer a system results in significant cost savings.