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When there’s clouds (not smoke), there’s fire
March 2016, IS & Ex


Fire protection systems form a crucial part in any risk management system. They control and minimise the consequences of a fire. The best outcome of course is to reduce the consequence to a negligible event or, at the very worst, to one of low impact where only small equipment and materials need replacing.

The prospect of a fire can have a devastating impact on a business or process. When one mentions the word ‘fire’, images of the Saturday afternoon braai/BBQ are conjured up. This is a far cry from the kinds of fires one can expect on machinery, substations, data centres, warehouses and the like. Generally the prominent ignition source is from an electrically energised above-normal resistance cable joint, or piece of moving equipment that has malfunctioned, resulting in material temperature increase from friction. These fires spread easily along the source of fuel (cable) and knock out a transformer for example, and hot combustibles can be transported via air handling systems if not controlled. One need only ask a fire fighter as to the ferocity of such fires.

Substations are particularly at risk

Specifically when viewing substations with switchgear, motor control equipment and variable speed drives, the cause of a fire is usually as a result of an overheat from electrical current passing through an above normal resistance joint, resulting in above normal amounts of energy being transmitted to the insulating material. This results in higher temperature which ultimately leads to ignition and flame. Provided you have air (oxygen) this fire shall be a self-sustaining chemical process that seeks out fuel and continues burning until there is total destruction. This can often escalate quickly if not detected and acted upon almost immediately. Consider this underground in a mine tunnel where the heat face can be several hundred metres from the fire itself? Dealing with that problem is something no one wants to face. Never mind the toxic gases and smoke that are released.

Alien Systems & Technologies (AST) has been in the fire protection business since 1999, and has been dealing with these issues on an almost daily basis with its customers. In response to these dangers, AST has been at the forefront of in-cabinet fire detection and protection systems, such as Pyrogen Aerosol Fire Protection Systems. This system is widely used across all mining and industrial sectors within switchgear, MCC and VSD equipment, which is both sealed and ventilated.

Nevertheless, AST has gone a step further by offering Cirrus Pro specialised air sampling systems that can detect fire during the incipient stage – this being when materials begin to overheat before they emit smoke or ignite into flame. These systems use cloud chamber technology (CCD) that measure the amounts of invisible combustion particles present in the air. When combustion occurs at the earliest stage of a fire, these particles are emitted into the air at a rate of one billion per second. By continuously sampling the air in a room or array of cabinets via a supervised pipe network, air, along with any of these combustion particles, is drawn back into a cloud chamber.

The cloud chamber exposes the air sample to a pressure drop that results in condensation and a cloud is formed. Although governed by complex barometric physics, it is as simple as weather. When the invisible combustion particles are inside the cloud the chamber, condensation occurs around the invisible particle to form a water droplet that is measurable using high-powered LEDs. Effectively the density of the cloud reflects the extent of combustion and its escalation.

A crucial advantage of Cirrus Pro CCD systems is that because it looks for invisible combustion particles and not smoke particles, no false alarms ever result from dust. Dust being of a similar size to smoke often plagues smoke detectors using traditional optical detection methods (light scattering from either lasers or infra-red LEDs). Hence Cirrus Pro Cloud Chamber Detectors can be used in dirty environments and provide fast response times to an impending fire threat.

A Cirrus Pro Fire Detection System is an ideal partner to any existing fire protection system such as a Pyrogen Aerosol System, or gaseous fire extinguishing system such as Pyroshield. It can be designed for room fire detection systems, be installed in such a way that it can sample in-cabinet at the potential source of a fire, or be used for areas with limited accessibility such as cableways, trenching systems, basements, false floors, etc. The system can also interface with PLC/scada systems if desired.

Using a Cirrus Pro system will enhance your level of fire protection and provide a significant step toward mitigating the effect of a fire. This is because it can detect a fire at its earliest stage and so provide a timely warning to negate the impact from a fire.

For more information contact Alien Systems & Technologies, +27 (0)11 949 1157, sales@astafrica.com, www.astafrica.com


Credit(s)
Supplied By: Alien Systems & Technologies
Tel: +27 11 949 1157
Fax: 086 718 3430
Email: grant@astafrica.com
www: www.astafrica.com
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Further reading:

  • PyroStorm provides cost-effective fire protection for control equipment
    December 2018, Alien Systems & Technologies, IS & Ex
    If you work at a large industrial plant or mine, you may have noticed those hydraulic lubricating oil packs, or perhaps the diesel generator sets, oil store rooms, pump rooms or flammable liquids stores, ...
  • Compact safety light curtains for tight spaces
    December 2018, RET Automation Controls, IS & Ex
    The new SLC4 is Banner’s most compact safety light curtain to date. It has a low-profile design and a sensing area that extends the entire length of its 160 mm housing. This Type 4 safety light curtain ...
  • Wise choices to decrease fire risk and improve safety
    November 2018, Spero Sensors & Instrumentation, IS & Ex
    Fire safety at the workplace is a topic that is easily neglected and many businesses do not devote enough attention to it. The topic quickly becomes top of mind when people lose their lives, or when a building or substantial part of an industrial plant is destroyed by fire.
  • Network-based process visualisation
    November 2018, Pepperl+Fuchs, IS & Ex
    IT technologies such as PC and server virtualisation are establishing themselves in larger plants in the process industry to reduce the growing number of PC hardware components, while at the same time increasing flexibility and availability.
  • PC-based control for the process industry
    November 2018, Beckhoff Automation, IS & Ex
    Beckhoff Automation adds Ex protection to extend its reach in hazardous areas.
  • Don’t forget to test your fire protection systems before the holiday shutdown
    November 2018, Alien Systems & Technologies, IS & Ex
    As the year draws to a close, it is natural that people start looking forward to the holidays. It is therefore quite easy to neglect to consider the damaging effect a fire could have on businesses during ...
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    November 2018, Rockwell Automation, IS & Ex
    The rise of robots has ushered in an increased demand for light curtains that provide a safe environment between the robotic work cells and the rest of the plant. The Allen-Bradley GuardShield 450L safety ...
  • AST’s automated fire extinguishing systems
    October 2018, Alien Systems & Technologies, System Integration & Control Systems Design
    Restoring protection after a fire is an integral part of the service.
  • Pyrogen system ideal for fire protection in cabinet systems
    September 2018, Alien Systems & Technologies, Electrical Power & Protection
    Method of operation Pyrogen is the ideal choice for in-cabinet systems. It is essentially a non-pressurised canister that contains a potent fire extinguishing compound that consists primarily of potassium. ...
  • How to choose an industrial safety controller
    September 2018, RET Automation Controls, IS & Ex
    The following are five key features to look for in a safety controller that will save time and money, as well as help ensure that operators are using the safety system correctly. As with any safety application, ...
  • Controllers simplify machines and improve safety
    September 2018, Rockwell Automation, IS & Ex
    The Allen-Bradley GuardLogix 5580 and Compact GuardLogix 5380 controllers from Rockwell Automation can be scaled from safety system levels SIL 2/PLd to SIL 3/PLe. This scalability can help engineers optimise ...
  • Extech brings i.safe Mobile to sub-Saharan market-
    September 2018, Extech Safety Systems, IS & Ex
    Extech Safety Systems has partnered with GoRugged to distribute i.safe Mobile products in sub-Saharan Africa. The IS520.1 is an industrial smartphone with current technology for use in Zone 1/21. It combines ...

 
 
         
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