In addition to being the largest local manufacturer of forged railway tyres and rings, Ringrollers also produces high quality flanges for use in the water supply and treatment, petrochemical and mining industries.
Quality manufacturing, and in particular achieving close tolerances, is probably the most important factors in producing flanges for use on pumps and pipelines in the water industry. Stephan Nel, general manager at Ringerollers says the processes in place at Ringrollers’s 18’000 m2 Springs plant facilitate optimum quality and repeatability of rings. “And the recent expansion of the heat treatment facility will greatly enhance lead times,” he adds.
Ringrollers, part of the DCD-Dorbyl group, is a forging and rolling company servicing the rolling stock, mining and industrial markets by producing railway tyres, tram tyres, seamless rings and flanges. While the manufacture of railway tyres accounts for the main portion of its business, significant quantities of forged rings and flanges are supplied to other industry sectors.
Boasting ISO 9001, OSHAS 18001 and API safety and quality certification, Ringrollers places emphasis on the use of quality materials of construction in its products. The main raw materials used by Ringrollers are high carbon manganese steel; low carbon manganese steel; alloy steels, such as 4140, 4330 and 4340; stainless steel and duplex stainless steel.
Ringrollers has one of the most technologically advanced rolling mills on the continent and the company produces stainless steel and carbon/manganese steel flanges in a complete range of both medium and large diameters (up to four metres).
Areas of specialisation include the manufacture of weld necks, slip-ons and special made-to-order flanges, all forged to recognised international specifications, including ASME B16.5-2009, SANS 1123-2009, API 605, MSS SP44, AWWA C207-07 and ASME B16.47 A or B. Weld neck flanges are profile rolled and can also be machined as required.
“Both destructive and non-destructive tests are done on our products. The destructive tests are performed by an independent third party laboratory and we undertake the non-destructive tests internally,” Nel says.