When it comes to protecting people and plant from highly flammable compounds, attention is usually focussed on inflammable liquids such as solvents and other petrochemicals. However, dust and ultra fine powders can pose a very real threat in terms of fire hazard and have been the cause of many deaths around the world in industrial environments.
Back in 2008, 14 people were killed and 38 others were injured when dust exploded at a sugar factory in Port Wentworth, Georgia. The Occupational Safety and Health Administration, OSHA, reported back in 2012 that 130 employees had lost their lives in a period of just over 30 years. During the same period, it reported that 800 more people had been injured due to dust and fine powder fires and explosions.
As a particle progressively becomes smaller, its specific surface area increases, which accelerates its combustion, and hence, the quantity of energy liberated. Second, it is much easier to form a cloud of fine particles with air, and this also facilitates their combustion and flame propagation. When considering all the particles in a standard size bag of flour, for example, it is estimated that the total surface area is an incredible 340 square metres.
Anyone who has studied basic grade chemistry will know that the three essentials for a fire to start are fuel, oxygen and of course a source of ignition. Many fine powders can act as the fuel for the reasons outlined above, and of course there is a plentiful supply of oxygen given the fact it’s a main constituent of air, essential for life. So that leaves the third essential, a source of ignition. It is for this reason that two European directives have been introduced to control potentially explosive atmospheres. There are different directives for various environments.
ATEX Zones 21 and 22 are specific to hazardous dust environments, such as those in the coating sector and the food industry as outlined above.
In a hazardous dust environment, an ATEX Zone 21 is classified as ‘a place in which an explosive atmosphere in the form of a cloud of combustible dust in the air is likely to occur occasionally during normal operation’. On the other hand, an ATEX Zone 22 is classified as 'a place in which an explosive atmosphere in the form of a cloud of combustible dust in the air is not likely to occur in normal operation but if it does occur, it will be present for a short period of time only’.
Whether the danger is for a prolonged period, or for a limited short period, the directives call for electrical equipment to meet stringent standards. Clearly, it only takes one spark form a piece of electrical equipment to cause a major industrial catastrophe, hence the inclusion of the ATEX 22 directive that address the shorter periods of time.
Teledyne FLIR are pleased to announce that their new FLIR Si2x series of acoustic cameras are certified for ATEX zone 22, ensuring safe and effective condition
monitoring in hazardous environments. There are significant benefits of using the FLIR Si2x in explosive vapour environments.
Why Use an Acoustic Camera?
The FLIR Si2x acoustic imaging camera accurately detects extremely small leaks in compressed air systems and other gaseous environments. At a distance of 10 metres the cameras is capable of detecting leaks as small as 0.05 litres per minute. With real-time leak size and cost estimates, you can make quick, informed repair decisions to maintain efficiency.
Faster and More Accurate Detection
Traditional leak detection methods can't match the speed and accuracy of the FLIR Si2x. In addition to detecting compressed air leaks it efficiently quantifies leaks in industrial gases such as, ammonia, hydrogen, CO₂, methane, helium, and argon. The camera's mechanical fault detection mode also identifies and measures potentially faulty bearings, keeping your equipment in top condition.
Speeds Up Audits and Requires Minimal Training
Designed for ease of use, the FLIR Si2x allows you to quickly scan large areas without disrupting operations. Its intuitive interface requires minimal training, making it accessible to all team members and ensuring comprehensive safety audits with minimal downtime, and without the need for hot working permits. This facility means that any inexperienced or new member of staff can conduct an inspection with ease, allowing more experienced and senior members of the team to continue with other pressing issues.
To find out more about the Si2x-LD and the Si2x-PRO acoustic camera and other instruments in the Teledyne FLIR range please contact your local agent or your FLIR distributor.