African Petrochemicals- Mar/April Edition 15_2 {2018}

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The Information Revolution the smart process. We believe access to information should be simple! The Connected Enterprise makes it effortless. The ‘Internet of Things’ is driving the convergence of integrated control and information technologies. The Connected Enterprise helps advanced industrial operations be more productive, reliable, secure and sustainable, and respond competitively to dynamic demands within the oil and gas industry. Simplifying integrated process automation • Integrated control • Deterministic network • Secure infrastructure • Enhanced safety • Actionable information • Scalable dimensions • Future-proof networks • Operational efficiency From upstream to downstream, The Connected Enterprise helps ensure your informational connectivity, the smart way. Discover the right integrated control solution for your business. Tel: +27 11 654 9700 Find out more about The Connected Enterprise: http://www.rockwellautomation.com/en_ZA/capabilities/ connected-enterprise/overview.page? Copyright © 2017 Rockwell Automation, Inc. All Rights Reserved. Integrated Architecture is a registered trademark of Rockwell Automation, Inc. 9
FACTS ABOUT WATERMIST AS A FIRE SUPPRESSION SOLUTION 10 Sperosens, a Danfoss-Semco partner, has recently embarked on introducing and developing High-Pressure water mist into the Southern <strong>African</strong> market. During experimental tests and demos, the effectiveness of water mist was clearly seen. During a test of the cooling effect of water mist on a petrol and diesel pan fire (1m by 1m) was started inside a 6m container. A pre-burn period was used for the fire and heat to fully develop. A sprinkler system with four sprinklers operating at a total flow rate of 1000 liters per minute, was compared to one water mist nozzle operating at 40 bar and 9 liters per minute. The sprinkler system did not manage to supress or extinguish the fire, while the mist nozzle was able to effectively extinguish the fire within 8 seconds. Using a thermal camera to visualise the heat release and reduction rates, it was seen that after activation of the mist system, the ambient temperature inside the container drastically reduced form in excess of <strong>15</strong>0 °C to under 45°C after the mist was activated, proving and demonstrating the unique properties and life safety benefits that water mist has to offer. Over the past two decades, interest in water mist as a fire suppression systems technology significantly increased. As technology grew, the capability and understanding of water mist grew. By 1996, there were over 50 agencies around the world who were involved in research and development of water mist, ranging from theoretical investigations of the extinguishing mechanisms to testing and development of mist generating equipment and hardware. The major focus of this development was to show that water mist has the potential to replace current fire protection techniques that are not environmentally acceptable and to find solutions to inefficiencies that current traditional technologies cannot answer. Before we focus on the fire supressing properties we first look at how water mist is defined. Water mist, according to NFPA 750, the Standard on Water Mist Fire Protection Systems defines water mist as a fine mist/fog spray were the Dv99 (99% of the distributive summation) of all the droplets is less than 1000µm in diameter. The standard also defines that low-pressure systems operate at less than 12.1 bar, intermediate-systems between 12.1 bar and 34.5 bar with highpressure systems operating at 34.5 bar and greater. The focus is to break the water into extremely fine water particles and distribute a tested and proven amount of water mist flux into the risk area. Water mist has extremely favourable properties that make it such a favourable fire suppression system compared to other technologies. When considering the fire triangle, current fire technologies attack only
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African Petrochemicals- Mar/April Edition 15_2 {2018}

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