case study
Engineering challenges and solutions The project’s complexity lay in its scale, precision, and the behaviour of stainless steel under heat. Joining the extruded 316L pipe sections proved difficult due to ovality. Grandi’s engineers, led by Owner and Managing Director Marco Grandi and Partner Brandon Ryneveld , developed a custom jigging system to ensure accurate alignment during welding. Fabricating the ten-metre box beam to strict tolerances presented another challenge. To prevent distortion, the team developed a plug-welding procedure combined with backstepping short, alternating welds that balanced heat input and stress. The result was exceptional: the beam remained perfectly straight with no measurable distortion after welding.
Comprehensive Dye Penetrant Testing (DPT) was carried out on all critical welds, with 10 percent of remaining joints tested for verification. The project achieved full compliance with internal and client standards. Sustainability and performance From an environmental and operational standpoint, the Sea Water Filter highlights the sustainability of stainless steel in coastal industry. Its role to separate, recover, and recycle water from Tronox’s mineral slurry supports the operation’s water-conservation goals. In a region where freshwater is scarce, reclaiming and reusing process water is vital. Stainless steel’s durability, corrosion resistance, and recyclability ensure decades of service with minimal maintenance. Its use lowers lifecycle costs and environmental impact, removing the need for coatings or frequent replacement proof of its long-term value. Industry impact and lessons For South Africa’s stainless steel sector, this project marks a milestone in both scale and quality. It shows that local manufacturers have the expertise and infrastructure to deliver complex, high-tolerance stainless structures to international standards. Key lessons include: • The importance of distortion control and heat management in large stainless assemblies.
• The value of early collaboration between design, welding, and inspection teams.
• The need for detailed welding documentation to ensure traceability and client confidence.
As Robert Lawrence , the overseeing welding engineer, notes: “This fabrication set a new benchmark for stainless steel construction in South Africa. Achieving zero distortion across ten metres of stainless while maintaining full code compliance reflects the exceptional skill and teamwork. “ Conclusion The Tronox Sea Water Filter is more than a technical success it is a showcase of South African engineering and the enduring value of stainless steel in demanding industrial environments. Through precise fabrication, disciplined welding, and rigorous quality control, the delivered structure met its purpose and reflects the strength, sustainability, and innovation of the stainless-steel industry. Marco Grandi , concludes, “This project reflects everything we stand for, namely a precision, collaboration, and a commitment to quality. It’s a proud moment not only for our team but for South African manufacturing as a whole.”
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Issue 4 – 2025
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