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Chemical Focus


Fire suppression in corrosive environments T


yco Fire Protection Products has enhanced its portfolio of water-based fire solutions with the introduction of the new DDS Duct Deluge System, a specially designed set of components used in ventilation ductwork suitable for extremely corrosive environments.


The system resists damage from corrosive gases to provide effective fire protection in highly acidic ventilation and ductwork systems in widths from 1 to 16 ft and at temperatures up to 150˚C (302˚F). The Tyco DDS system is best suited to


circular, rectangular or irregular ductwork in applications, including chemical industry and acid processing plants due to its highly corrosive resistance. The package brings together a complete range of components, including water spray nozzles, linear heat detection cables, duct mounting hardware and an electric actuation deluge valve cabinet as one. Available as a complete fire protection


solution, the DDS system minimises down- time, limits routine inspection and reduces maintenance while ensuring the fire is extinguished safely and effectively. Intrinsic to the system, the open


directional Tyco Type DN-5 Duct Nozzles discharge a uniform spray of medium velocity water droplets that are effective in coating exposed vertical, horizontal, curved and irregular shaped surfaces. The nozzles are constructed of stainless steel and can suppress and extinguish fire in duct interiors, preventing structural damage and the spread


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of fire. Furthermore, the DDS nozzles are coated with HALAR, a corrosion resistant layer that can tolerate extremely acidic environments in a multitude of applications. Another critical element of this system is the PROTECTOWIRE Linear Heat Detector which provides heat detection and point sensibility along the length of cable. Consistent with the overall DDS design, PROTECTOWIRE can withstand severe application conditions, yet is sensitive enough to identify and display the alarm location. To allow for movement during duct vibration or seismic activity, the FLEXHEAD Duct Mounting System offers a sprinkler connection that can operate in highly volatile conditions. The model can be installed in minutes and also minimises plant shutdown. The braided stainless steel flexible hose and the HALAR mounting blocks are also supplied and easy to install. n


For more information, visit www.tyco-fire.com


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