Using additives to protect bulk fuel in storage

Buying diesel or gas oil in bulk can help to save time and reduce costs for businesses in the long term.

But maximising the benefits of storing bulk fuel is dependent on keeping stocks healthy over time. Exposure to air, moisture or other contaminants in storage can reduce fuel shelf life, increase consumption and even damage vehicles and machinery.

Luckily, there are a range of diesel treatments and additives available to help protect against contamination and extend the shelf life of bulk fuel in storage. Here we explore the additives that can help bulk fuel go further and share some best practice tips for maximising treatment effectiveness.

Protecting fuel from FAME

The Renewable Transport Fuel Obligation (RTFO) regulations require a certain percentage of fuel to come from renewables. As fuel suppliers must meet this obligation by law, many are blending a type of biodiesel called FAME (fatty acid methyl ester) into red diesel to achieve the higher targets.

FAME’s methyl esters are hygroscopic, which means they absorb and retain moisture at a higher rate than conventional mineral diesels. This means that bulk fuel stocks containing FAME – particularly those stored for extended periods – are more at risk of contamination. 

Contaminated fuel accounts for as many as eight out of ten diesel engines failures.

Gas Oil Supreme is a red diesel additive that directly counters the negative effects of increased FAME content in gas oil. The additive builds increased water resistance in bulk fuel stocks to combat FAME’s higher moisture retention.

This prevents emulsions from forming in the fuel that lead to filter and line blockages, and also helps to ensure that water does not enter fuel delivery systems – which can cause eye-watering maintenance bills for damaged fuel injectors.

Gas Oil Supreme also delivers a range of additional benefits. The additive increases the cetane number of gas oil stocks and enhances fuel lubricity, helping to improve fuel performance, reduce deposit formation and protect against corrosion.

For more information about the RTFO, FAME and how to prevent related disruption to your business, download our free guide here.

Extending fuel shelf life

Fuel ages and degrades over time. Stocks that have been stored without treatment for long periods will age – forming solids, darkening in colour and ultimately losing oxidation stability – a key parameter of meeting fuel specifications. This degradation is further accelerated where fuel contains higher levels of biological content, such as FAME.

Fuel Store Plus helps to delay the symptoms of fuel ageing to prolong the life of B7 grade diesel to 12 months or longer.

Containing high doses of antioxidants and biocides, this life-extending diesel additive delays fuel discolouration and the formation of solids; reduces the potential for filter plugging and corrosion; and helps to prevent the microbial growth that causes ‘diesel bug’.

Fuel Store Plus is most suited for use in bulk stocks that will be stored for a long period of time, or where there is potential for fuel to be left unused in vehicles or machinery over seasonal periods.

Without treatment, the shelf-life for on-specification fuels is around six to eight months.

If your fuel stocks do become discoloured and oxidised, all is not lost. Fuel Reviver is an additive that restores the stability of aged fuel to bring bulk stocks back into specification.

Introducing Fuel Reviver in the correct dosage ‘revives’ the oxidation levels of bulk fuel stocks so that they meet OEM requirements for stability. While the additive will not revert the colour of fuel back to its original state, it does bring aged fuel back to acceptable standards to render it fully usable again.

How to use fuel additives effectively

To make sure fuel additives work effectively, it’s vital that the stocks in your bulk fuel storage tank are in top shape before introducing the product. Take samples from the top, the middle and the bottom of a tank to check for water, sludge and sediment. Anything that isn’t clean fuel should be removed from the tank immediately through polishing or filtration to prevent future issues.

Once the contaminants have been removed, test the fuel again to ensure it is clean, dry and ready to use. If high levels of contaminants are found – arrange for a professional deep clean of the tank by an OFTEC registered engineer for maximum peace of mind.

Now you have ensured your fuel stocks are clean, it’s time to add the additive. Different additives have different treatment ratios, so be sure to check the appropriate dosage before introducing the product to your bulk fuel stocks.

If treating a full tank of fuel, be sure to mix the fuel and additive with a pump for the best results. Adding fuel on top of an additive can also ensure thorough mixing. If you do not have access to a pump to help mix the fuel and additive, it’s best to add additives to your bulk storage tank prior to a fuel delivery.

At Certas Energy, we deliver more than just fuel. Our range of diesel treatments and fuel additives has been built around making your business’ fuel go further. Visit our additives page for more information or get an additives quote by speaking to a member of our team today:

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