C+S March 2021 Vol. 7 Issue 3 (web)

In addition to their 304 and 316 Stainless Steel or galvanized mild steel construction, Flamgard’s durable dampers integrate special, high-tem- perature switchboxes from TopWorx, a division of Emerson and global leader in discrete valve control and GO™ Switch position sensing for process applications. Unique in their ability to withstand extremely high temperatures for long periods of time, these switch boxes enhance the reliability of the CFD-02T dampers even further—guaranteeing the safety of passengers no matter the operating condition. Switch Boxes Designed to Take the Heat TopWorx™ High Temperature Switchboxes monitor the position of the Flamgard dampers within the Riyadh Metro tunnels, furthering the dampers’ reliability in this state-of-the-art transit system. These units, as part of each CFD-02T damper system, can perform up to two hours at 400°C according to this application’s requirements. They can also operate at multiple high temperatures with varied exposure times for dampers and ON/OFF valves; according to third-party thermal tests, the switchboxes can withstand four hours at 400°C—setting it apart from all other switchboxes on the market. In addition to their reliable performance at extremely high tempera- tures, the switchboxes integrate a compact, proprietary internal design that improves their ability to provide accurate process feedback under demanding conditions. The components include stainless steel cams, ceramic terminal strips, high-temperature single pole double throw (SPDT) switches, and wire with pressed-on terminal spades. “After reviewing the specifications for the Riyadh Metro project, we realized the need for the TopWorx high-temperature switch boxes,” says Steve Edwards, MBE, Managing Director at Flamgard Engineer- ing Ltd. “Initial meetings cemented our decision that Emerson was the perfect partner for this project. We agreed up-front on the specifica- tions, deliveries, and price for the 384 units, split over five batches, and everything was delivered exactly as we had agreed upon—leading to the success of this project. Overall, the process was easy and flawless.” Together, the combination of the Flamgard CFD-02T tunnel dampers and TopWorx switchboxes promises to keep millions of people cool— even when things get hot. A Revolution in Transportation Set to fully open in 2021, the Riyadh Metro system is projected to reduce 250,000 car trips a day within the Saudi Arabian city. Costing $23 billion, it will feature fully autonomous monorails covering six lines and 85 stations across a hundred miles of track—most of which is located underground. Due to the recent and projected growth of Riyadh, this new metro system promises to revolutionize how several million people navigate the city each day.

To learn more about Flamgard Calidair fire and tunnel dampers, please visit https://flamgard.co.uk. To learn more about TopWorx position sensing solutions, please visit www.emerson.com/topworx. A TopWorx™ High Temperature Switchbox. These units monitor the position of the Flamgard dampers within the Riyadh Metro tunnels. Photo: Emerson

A Damper for the Harshest Conditions Flamgard’s flagship HVAC solution for underground tunnels, the CFD-02T damper regulates air flow in transit tunnels. These applications include some of the most demanding conditions around. To guarantee reliable operation day in and day out, they must undergo rigorous testing and validation processes: • Tested to perform up to two hours at 400°C. • Pressure tested for one hour at 400°C and 4,000 Pa • Field Integrity Tested to UL 555 and BS476 • UL 555 high-pressure hose tested • Endurance tested to 100,000 cycles • Damper frame endurance tested for 1 million cycles • Tested for environmental exposure and salt corrosion



march 2021

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