Leading university chemistry department specifies walk in flammable storage solution Five steps for safer storage of flammable substances

While there is widespread appreciation of the need to store flammable substances safely warehouse fires are still a regular occurrence and incorrect storage of flammable substances is often found to play a part in these incidences.

When such a fire occurs it is not necessarily the case that there is a complete disregard for safety, but there are some common mistakes that we witness during site visits that put premises and people at increased risk.

One example is the assumption that storing drums containing flammable substances in an off-the-shelf chemical store means they are safe when this may well not be the case. Often standard stores don’t offer thermal protection which means once the weather heats up the products inside the store do too at which point they can start to give off a flammable vapour and become hazardous.

This is a very simple example but the reality is that storing flammable substances is rarely straight forward with every site having a bespoke set of factors that need to be taken into consideration. It’s therefore useful to consult a hazardous storage expert to ensure that you find the most appropriate solution for your needs but this doesn’t mean you can’t do some ground work first to help you build a picture of your requirements.

The most useful reference tool you have when looking at how to store a flammable substance safely is the product’s Safety Data Sheet (SDS) which will either be provided with the product or be available online – if in doubt contact the manufacturer/supplier. Safety Data Sheets can seem overwhelming at first glance but once you know what you are looking for they are actually quite easy to navigate and the following steps can help.

1. Identify the chemical. First of all, you need to know what you’re dealing with so refer to sections 1& 2 of the Safety Data Sheets to identify the substances you want to store and their associated hazards. Once you have this information use section 9 of the Safety Data Sheet to identify the flashpoint of the substance – make sure you are clear about the difference between the flashpoint and the auto-ignition temperature as it is a common mistake to get these confused. A misconception is that the flashpoint of a liquid is the temperature at which it auto ignites – this is incorrect – the temperature at which it auto ignites is called the autoignition temperature. The flashpoint is the temperature at which the liquid gives off flammable vapour. It is not the liquid but the vapour that ignites, so storing a product below this temperature means that no flammable vapour is created. Controlling the temperature also has another benefit that the flammable or hazardous material may work better in process or application when stored at a certain temperature, this temperature can be found in Section 7 of the Safety Data Sheet.

2. Consider compatibility. If you are storing more than one substance, consider whether they are compatible as certain chemicals need to be segregated within a storage facility.  Refer to Section 10 of the Safety Data Sheet to identify incompatible materials.

3. Define the application. Consider how you are using the substances as this will affect the level of risk. Bulk storage of unopened items in sealed containers poses a much lower risk of giving off a flammable vapour than storing products in use where a seal has been broken and lids may not be replaced properly. That said, manufactured sealed containers can cause an issue when stored above the flashpoint and the container is trying to release the vapour because the vapour has nowhere to go which will create pressurised containers that eventually burst or go bang. Remember that you need to think about what will happen to your store if a fire breaks out elsewhere in your facility as well as the risk of a fire breaking out within the store itself.

4. Combat the risks. Think about how you can combat these risks using a hierarchy of hazard controls approach. First, consider whether you could use an alternative substance that poses less of a risk. If this isn’t possible think about what you can do to reduce the risks. Firstly think about thermal protection and temperature control – ensuring a product is stored at the correct temperature as per the Safety Data Sheet will help to prevent flammable vapours from occurring – you also need a way of monitoring this temperature – preferably via a remote system that will alert you of any critical changes in temperature. Next consider whether you need an extraction systems to remove vapour in the event that it does get released, once again this needs to include VOC/gas detection monitoring so you receive an alert if there is a rise in vapour so you can address the situation. The next step is to think about fire detection systems to raise the alarm if you have a fire – a double knock system can reduce false alarms so this might be worth considering. Your unit also needs to include the most appropriate fire suppression media which varies depending on the hazard and will be highlighted in Section 5 of the Safety Data Sheet. Frustratingly sometimes the information within these sections can seem contradictory, for example within the Safety Data Sheet for acetone Section 5 recommends using water sprays but not to use water jets – this is why consulting an expert in hazardous storage is advisable.  There is also currently some confusing and contradictory information surrounding the most appropriate media for extinguishing lithium-ion battery fires. This reiterates why it is important to consult a hazardous storage expert with experience in these areas.

5. Have a fire response plan. Anyone storing flammable substances needs to be able to instantly know what’s in their building and what you’ve done to protect your site and the surrounding neighbourhood so ensure you have a detailed inventory that can be accessed quickly in the event of an incident. For example Chemstore’s cloud-based hazardous material management software system, Chempli, which can be specified with a unit, includes a QR code that can be featured outside a building or at a security gate enabling the user to instantly access the relevant information in the event of an incident.

Conclusion

This is a very basic guide to some of the factors that need to be taken into account when planning the storage of flammable substances but hopefully it provides enough information to give you an understanding of the needs on your site. If you are in any doubt about your current storage arrangements, or you are in the process if specifying a new system, contact Chemstore Engineering today for a free site survey.

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Chemstore Compliance (www.chempli.com) provides the most advanced software platform for the management of an organisation’s hazardous material; mitigating risk, lowering costs and guaranteeing compliance.

Using our 27 years of experience we have listened to you, the customer and understand the challenges and risks your job present. Through years of hard work and research, we have developed the compliance management software to enable you with a live, ready for use system guaranteeing compliance on your site.

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Opinion: Electric car revolution welcome but safety is paramount

Chemstore UK welcomes the Government’s announcement that all new vehicles in Britain will be electric from 2035 and the positive impact this will have on the environment, however when it comes to the technology behind electric vehicles – lithium-ion batteries – it must be remembered that safety is paramount.

Lithium-ion batteries have quickly become ubiquitous powering so many of our every day devices from mobile phones and laptops to power tools. However their risks are still poorly understood.

Lithium-ion batteries are now a common contributor to household fires and they have become a serious hazard in waste and recycling centres as people casually dispose of them within their household waste with little understanding of the dangers they pose. They are also present a serious hazard within industrial premises.

One major issue is that they are vulnerable to thermal runaway, an uncontrollable chain reaction during which the high heat created by the failing cell can develop to the next cell, causing it to also become thermally unstable. Once ignited, the batteries can also emit toxic fumes and battery cells can reignite hours after an initial fire has been extinguished making them extremely unpredictable for the fire service to deal with.

Why lithium-ion battery fires start is unclear but manufacturing defects and contamination, damage in transit and over charging are all thought to play a role. If they are not appropriately segregated there is also the risk of them being affected by a fire that has started elsewhere which can have devastating consequences.

More questions than answers

The reality is that there are more questions than answers at the moment about lithium-ion battery safety and even the fire service is learning as we go. Research is underway which will hopefully provide some clarity but it is prudent to manage lithium-ion batteries with the utmost caution until we fully understand their risks, handling them with care and keeping them in specialised safe storage facilities, such as Chemstore’s Electrovault range, segregated from other hazards.

As trusted specialists in hazardous materials, at Chemstore UK, we are already working with leaders in the automotive and motorsports industry to ensure they are handling and storing their lithium-ion batteries in line with best practice as it is currently understood.

However whether you are an electric car manufacturer handling and storing vast quantities of lithium-ion batteries, or just dealing with this technology in small amounts, it is important not to overlook this omnipresent risk.

Chemstore UK offers a range of indoor and outdoor handling and storage solutions for lithium-ion batteries as well as providing bespoke storage options. Contact us today on 020 8704 1807 to find out more.