The Mathematics of Monitoring Gaseous Extinguishing Systems & Room Integrity

Applying Mathematics

The fire industry calling is a noble one. It is uses scientific principles to enable its very existence. The fire industry, however, calculates fire engineering designs based on formulas that its technicians have no way of understanding or verifying are accurate. The industry needs a Resident Mathematician to ensure that the formulas they use are correct. Fire engineers do not always understand the physical properties of the clean agents they use. Some do not wholly appreciate the impact of temperature on the state of an agent or its pressures. Novec™ 1230 for instance is an organic compound which deteriorates quickly to a point of non-effectiveness if poorly handled and stored. These problems and many more can be solved in the fire industry by the application of fundamental scientific and engineering principles. But they can only be proved by the application of the mathematics of them. Coltraco are at the vanguard of this in the fire industry.

Clean Agents

Are pressurised liquefied gases or non-liquefied gases that are pressurised on actuation. CO2 is permanently under 720 psi or 49 bar of pressure ie nearly 50 times atmospheric pressure (by comparison a cup of water at sea level exists at 1 bar or 14.5 psi). Its state changes under increased temperatures to one that is neither a liquid nor a gas. Gases under pressure are often effectively considered by the industry as single and passive cylinder columns of solid material from the perspective of their monitoring following installation. Whereas being under pressure and constantly changing under temperature they should be considered as active and dynamic systems requiring constant monitoring. These are not passive systems therefore; they are dynamic ones, and all dynamic systems under pressure need constant monitoring.  

We achieve this

By our ability to establish the liquid contents of liquefied clean agents – through UL-approved Portalevel™ MAX and the constant monitoring system, Permalevel™ Multiplex. Once we do this we can establish their weight and mass – through Portasteele™ Calculator (the world’s first product capable of this). If we can monitor their pressure too then we can monitor both the pressure of the gas above the liquefied agent such as in Novec™ 1230 and the pressure of non-liquefied gases such as Inergen or Nitrogen.

Constant Monitoring  of Gaseous Extinguishing Systems

A data centre is expensive to build and maintain. It generates significant heat. Every bank with a branch network has hundreds of them. The value of them are very high but the value of their inability to sustain business continuity is far higher than their physical assets. Almost incalculable. And yet Insurers are asked to underwrite them and the fire industry to deliver their protection at the cheapest price. Who today in the security industry would consider installing an alarm system without

monitoring its status not only its actuation and integrating the whole of it to the building management system with central monitoring being an essential part of it ? Who would build a ship or offshore platform and fit it with say power generating auxiliary machinery without installing emergency power systems or monitoring their condition states ? These are basic engineering principles.

All good engineering demands the monitoring of dynamic structures and a highly pressurised cylinder is a dynamic structure. It is designed to protect a critical infrastructure or asset. Without constant monitoring a risk is generated in the very environment for which it is designed to reduce risk. The risk is not only to the asset, but to the people who work in the asset and their ability to enable business continuity in the high value asset under risk. We aim to be the lead technical authority in the constant monitoring of gaseous extinguishing systems during the life of the system once it is installed and commissioned.

Room Integrity Monitoring - There remains a wider problem too

This is essential under ISO 14520 where gaseous extinguishing systems have to be designed in relation to the discharging agent hold-time (if the room cannot hold the agent because of leaks the agent will disperse and not extinguish the fire) and discharging agent peak pressure (if the pressure is too high for partition walls or suspended ceilings they will be blown apart or damaged and possibly destroying the room integrity). At the design stage of a fire extinguishing system rooms are tested for room integrity by positively pressurising a room and detecting escaping pressure to verify that the room itself into which the gaseous extinguishant discharges on actuation can both hold the agent after its discharge and hold its pressure on actuation. The fire system is then installed and commissioned. But over the next 10 years few further tests are made on room integrity and the cylinders merely hydrostatically tested to ensure they can cope with their design pressure limits. How can one be sure therefore that on actuation the room will hold the discharged agent to extinguish the fire and its partitions and ceilings are capable of withstanding the pressure of the agent on discharge? A building is like a ship at sea. It turns, stresses & bends as any structure does. It ages and leak sites develop. Coltraco is generating capability that will allow for the constant monitoring of room integrity.  We aim to be the lead technical authority in the constant monitoring of room integrity during the life of the gaseous extinguishing system once it is installed and commissioned.

Conclusion

The fire industry has access to customers who depend on it to deliver fire engineering to protect their risks. Insurance companies underwrite that risk. But the mathematics of its failure are high, whether in the application and understanding of the formulas they use to calculate design concentrations of gases or flow rates or in the deployment of fundamental engineering principles to protect dynamic pressurised systems and the structures they are working so hard to protect against the risk of fire.

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