Ensure your generator is fire-safe

Issue 6 2022 Fire & Safety

A backup power supply such as a genset is critical to reduce overall electricity demand during load shedding. However, it is vital that such important equipment is maintained properly and serviced regularly to be able to cope with outages.


Michael van Niekerk.

Genset failure due to a lack of proper maintenance poses a significant business risk, especially due to increased load shedding. On 25 July, President Cyril Ramaphosa revealed in a national address that the country faced a 6000 MW shortfall in electricity generation by Eskom until sufficient renewable energy in the form of solar and wind power comes online.

When load shedding escalated to Stage 6 recently for the first time since December 2019, businesses and homeowners were left scrambling to ensure they had backup power solutions in place. “Here you are not only looking at protecting the value of your assets, but what the genset itself actually supports and protects,” says ASP Fire CEO, Michael van Niekerk. “The probability of something going wrong may be slim in the mind of the end-user, but in the likelihood that it does, the consequences can be potentially disastrous and even fatal.”

The first issue is fuel supply. This can range from an integral tank at the base of the genset to a 2200 litre Bulk to Farm (BTF) tank or a 210 litre drum. The presence of flammable liquids is an associated danger, especially in terms of refuelling and any spillages, so it is important to ensure that the storage of fuel is according to code so that it does not pose a risk to the home’s or business’s generator.

Another issue is vegetation or combustible material encroaching on a genset, which can often be hidden away. The genset itself is a potential source of fire ignition due to the high temperatures of the manifold. If the genset is indoors, these temperatures can be considerable, especially if ventilation is inadequate.

Keeping the generator free of any combustible elements such as grass, weeds or litter is essential to reduce the risk of a genset fire. Proper maintenance is therefore essential. If an oil filter has not been screwed on tightly enough, for example, it can result in an oil leak. If oil sprays onto a hot manifold as a result, the oil will ignite, resulting in a fire.

Companies and individuals often lack the correct fire-fighting equipment to deal with genset fires. For example, a dry-chemical fire extinguisher will douse the flames but not cool down any hot surfaces. A carbon-dioxide fire extinguisher, on the other hand, might cool down the overheated genset itself, but can damage any equipment due to thermal shock. Foam-based fire extinguishers are able to cool hotspots that may re-ignite fuel and the foam blanket will smother the fire, rapidly extinguishing it.

Gensets not only supply standby power but are essential to the day-to-day operations of institutions such as financial services and medical care. Hospitals, for example, will often have backup gensets all in the same room. If a fire breaks out in one genset, the rest of the equipment is immediately at risk.

In terms of fixed fire suppression systems, a range of options is available. Sprinklers are an obvious choice, but this depends on whether or not such a system has been installed already. If not, the cost can be prohibitive, as sufficient hydraulic capacity has to be guaranteed, which means that cheaper and more effective alternatives are more suited.

The next best option is a clean-gas fire suppression system. However, gensets in such a scenario are located in ventilated rooms, which compromises the integrity of the enclosure. If a gas system is discharged in such an environment, it is not possible to maintain the concentration of that gas for a sufficient period to suppress the fire. Hence, clean-gas systems are not ideal in these scenarios.

The third option is a water or foam mist fire suppression system that only uses a minimal quantity of water, but is also far more cost-effective than the clean gases used to recharge the system themselves. This suppresses a fire rapidly, cooling any remaining hotspots down to below the automatic ignition temperature.

All fire suppression systems with mechanical activation should be inspected monthly. Gensets should, by rights, be started up at least once a week to ensure the batteries are charged adequately. A cursory visual inspection will also reveal any potential problems or issues.

In terms of regulations and specifications related to gensets, such enclosures are classified as D4 for certain minimum fireproof requirements, including a specific fire rating for the walls. If the gensets in a building are not located in a purpose-built room and are hidden away in a basement next to parked cars, for example, it is a clear violation of the regulations.

“It is all about risk mitigation, based on how integral the genset is to the business in question. While it is essential for financial service providers and hospitals to invest in the best systems possible, smaller end-users also need to look at the impact of genset failure or fire on their businesses,” concludes van Niekerk.

For more information contact ASP Fire, +27 11 452 2169, [email protected], www.aspfire.co.za




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