Minimum Requirements for Bulk Fuel Storage on Site
If your business is planning to install a bulk diesel or petrol storage tank — on a farm, a construction site, a fleet depot, or an industrial yard — the bunding and site layout requirements are not optional extras. They are the baseline standard that protects your team, your property, and your business from environmental and safety liability.
Bulk fuel storage looks simple from the outside — a tank, a pump, a fill point. What most first-time buyers don’t realise is that a properly installed storage tank sits inside a carefully engineered containment system, designed specifically for the moment something goes wrong. A tank that leaks, ruptures, or overflows without proper bunding doesn’t just cost you the lost product — it creates a soil and groundwater contamination event, a fire risk, and a regulatory liability that can follow the site for years. The requirements below are the baseline every bulk storage installation should meet before a single litre goes into the tank.
What Bunding Actually Does
The bund is not decorative concrete. It is the last line of defence between your tank and an environmental disaster.
A bund is the containment wall and floor built around a fuel storage tank, designed to hold the entire contents of the tank — plus a margin — if the tank itself fails. Tanks do fail: corrosion, mechanical damage, a valve that isn’t properly closed, a vehicle collision, or simple age can all lead to a rupture or a significant leak. Without a bund, that failure sends fuel directly into the soil, toward groundwater, and potentially toward a source of ignition. With a properly designed bund, the same failure is contained on the spot, giving you time to respond safely and preventing a manageable incident from becoming a catastrophic one.
Bunds must have the capacity to contain a minimum of 110% of the volume of the largest tank within the bunded area. This is not an arbitrary safety margin — the extra 10% accounts for rainfall accumulation, any additional smaller tanks or piping within the same bund, and the practical reality that a rupture rarely empties a tank with perfect efficiency. If your largest tank holds 20,000 litres, your bund must be able to hold at least 22,000 litres. This is the figure every bund design starts from.
Bund Wall and Floor Specifications
Every dimension below has a specific engineering reason behind it — this is not a guideline to interpret loosely.
*A Note on the 1.8m Wall Height Limit
The maximum height restriction exists for a practical safety reason: a bund wall taller than 1.8 metres without a proper access point (steps, a ladder, or a platform) forces operators to climb over a wall to reach tank valves — creating a fall risk every single time routine maintenance or an emergency shutoff is required. If your site design genuinely requires a taller bund wall due to the volume being contained, safe entry and exit infrastructure must be engineered in from the start — not added as an afterthought once the concrete has already been poured.
Site Layout and Clearance Distances
Where the tank sits relative to your boundary and your buildings is just as regulated as the tank itself.
Bunding protects against containment failure. Clearance distances protect against a different category of risk entirely — fire spread, third-party exposure, and access for emergency services. Both sets of requirements work together, and neither can substitute for the other.
Safety Signage and Site Conduct
The physical structure is only half the requirement. What happens around the tank matters just as much.
A correctly bunded, correctly positioned tank can still be the site of a serious incident if basic safety discipline around it is not maintained. Fuel vapour is flammable well beyond what most people intuitively expect, and the signage and conduct requirements around a bulk storage installation exist specifically to control the everyday human behaviours that create ignition risk.
Why Signage Requirements Are Non-Negotiable
In an emergency, the fire department or emergency medical responders arriving on site have seconds, not minutes, to assess what they’re dealing with. Clear, visible product and capacity signage on every tank tells them immediately what firefighting approach is appropriate, what volume of hazard they’re managing, and what precautions their own team needs to take. A tank without proper identification signage puts first responders at genuine personal risk — they may use the wrong suppression method, or fail to anticipate the true scale of what they’re responding to. This is one of the simplest and cheapest compliance requirements on this entire list, and one of the most consequential to get right.
Getting It Right Before the Concrete Is Poured
Every specification in this article exists because someone, somewhere, learned the hard way what happens when it’s ignored — a tank that ruptured without adequate containment, a bund wall that couldn’t hold what it needed to, a fire that spread because clearance distances were treated as a suggestion rather than a requirement. None of these standards are theoretical.
If you’re planning a bulk fuel installation — whether it’s your first tank or an expansion of existing site infrastructure — the best time to get these requirements right is at the design stage, before a single cubic metre of concrete is poured. Retrofitting a non-compliant bund after the fact is dramatically more expensive, more disruptive to your operations, and in some cases simply not possible without demolishing and starting again.
A proper site assessment before installation — checking your intended layout against every one of these requirements, and against the specific product and volume you intend to store — is a small investment that protects a much larger one.