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lines and could potentially be flooded by stormwater runoff or groundwater ingress,” he says. “Multiple sumps were therefore built, and we fitted these with Grundfos SL pumps – one duty pump and one standby – controlled with level switches.”

If water levels in the sump rise, the pump is activated and discharges water from the sump to a sewer. He notes that Grundfos pumps were also used to supply water to hydrants and fire hose reels, a regulated safety requirement in all buildings. In the tallest two buildings, pressure boosting was also required for this purpose, so vertical multi-stage Grundfos CR90 pumps were installed to pump water from the basement break tank.

Regulations specify that buildings have one hydrant per 1000 m2 and one hose reel per 500 m2 with a flow of 20 litres per second at 300 kPa for one hydrant or 1.5 litres per second for three hose reels (0.5 litres per second per hose reel). This is required at the topmost hydrant or hose reel. Strydom highlights the reliability of the Grundfos pumps as a key factor for his choice, as well as the wide selection of pumps for various applications. “Combined with the user-friendly interface of the Grundfos product centre and its responsive sales team, this makes the selection of pumps for our designs much easier,” he says. “Grundfos also has above-average after-sales support in the industry, and is willing to assist with any pump-related issue.” Pluck says the engineers have to ensure that the best pump is specified to the optimal system in order to meet the client’s expectations. In high-end apartments like those in these Rosebank buildings, residents always expect a high quality of services to be reliably delivered, he says.

Grundfos South Africa (PTY) Ltd, +27 (0) 10 248 6000, info_za@grundfos.com, www.grundfos.com

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Unit 11, ABC Business Park Mastiff Rd, Linbro Business Park Sandton 2090, South Africa Telephone: +27 10 007 3222