Bunded spill pallet vs bunded IBC: which contains a mine-site leak

On a mine site, the question behind "spill pallet or bunded IBC?" is really "how do I keep a drum leak out of the ground and off the compliance report?" Both products answer it, an open bunded pallet you stand vessels on, or a bulk container with containment built in, but they suit different jobs, and the choice that actually matters is sizing the bund correctly under AS 1940. This is a practical comparison: what each one is, how the standard sizes the bund, a worked four-drum example, the material questions that decide whether plastic survives your reagents, and how to spec containment for a remote operation.

Spill pallet vs bunded IBC: what each one is

A spill pallet (or bunded pallet) is an open platform with a built-in sump underneath a removable grate. You stand drums, kegs or a mobile IBC on the grate, and anything that leaks drips through into the bund below, where it's held until you deal with it. Its strength is flexibility: the same bunded footprint can carry four drums today and a single IBC next month, and it forklifts as one unit.

A bunded IBC is a bulk container that carries its own integrated containment as part of the vessel, the bund is designed around that specific container. Its strength is that it's self-contained: for a reagent tank or a fluid store that lives in one place, the containment is always there and correctly matched, with nothing to set up. The trade-off is that it's built around one vessel, where a spill pallet is deliberately generic.

How big does the bund have to be? (AS 1940)

This is where most site setups go wrong, and it's the number that should drive the whole decision. Containment for flammable and combustible liquids in Australia is governed by AS 1940, the storage and handling of flammable and combustible liquids. The common belief that a bund must simply hold "110% of the total" is not how the standard works for a compound of packaged goods. AS 1940 sets the required capacity from the largest single container plus an additive proportion of the remaining containers, so a bund is sized around the biggest vessel it protects, with a contribution from the rest, not the naive sum of everything.

That distinction changes what you buy. It means one large IBC can demand as much bund as several small drums, and that adding a second identical vessel doesn't double the requirement. Getting the calculation right is the difference between a compliant compound and a bund that overflows in the one event it exists for. We set out the additive method and the current clause reference in the companion guide, IBC bund sizing: what AS 1940 actually requires, and it's worth reading before you size any containment. (Different or additional duties can apply to other dangerous-goods classes and to sites governed by other standards, confirm what applies to your substances.)

A worked example: four drums vs one IBC

Take two common mine-store scenarios and the logic of the AS 1940 additive approach becomes concrete. The figures below are illustrative of the method, not a compliance calculation for your site, always work it from the current clause and your actual container sizes.

The pattern: a spill pallet wins when the bund has to serve several vessels or a set that moves, because one bunded platform covers them all and lifts as a unit. A bunded IBC wins when a single vessel lives in place, because the containment is built around it and always present. Neither is "more compliant", both must meet the same AS 1940 capacity; they just get there for different layouts.

Which contains a mine-site leak better?

On the containment duty itself, a correctly sized bund of either type does the job. The real-world differences on a remote site are about practicality and failure modes:

• Rainwater. An outdoor open spill pallet fills with rain, which eats into its spare capacity and has to be checked and drained. A covered or integrated bund is less exposed. On a wet-season site this is a live issue, not a footnote.
• Movement. If vessels move between areas, a forkable spill pallet keeps containment with them; a fixed bunded IBC keeps it only where the unit sits.
• Inspection. An open sump is easy to see into and clear; an integrated bund needs a defined check routine. Either way, an un-inspected bund is a false sense of security, cracks, debris and trapped water all defeat it.
• Durability. Plastic bunds don't corrode when a spill sits in them, where steel bunds rust from the inside, an advantage on a site handling fuels, oils and reagents day in, day out.

As John Meir, our sales lead with 20-plus years in plastic handling, puts it: "Sites ask me which one 'passes'. They both pass if the bund's the right size and it's kept clear, that's the whole game. What actually decides it is the layout: things that move want a forkable spill pallet under them; a tank that lives in one spot wants its own bund. Buy for how the site runs, then size to AS 1940."

Material and chemical compatibility

Plastic containment has a genuine edge on a mine site, HDPE and polypropylene don't corrode, so a spill of diesel, hydraulic oil or a reagent sitting in the sump doesn't eat the bund the way it attacks bare or damaged steel. HDPE and PP also resist a wide range of fuels, oils, acids and alkalis. But "resists a wide range" is not "resists yours": compatibility depends on the specific chemical, its concentration and temperature.

So the rule is firm: before you rely on any plastic bund or container for a given substance, check that substance's Safety Data Sheet and the container manufacturer's chemical-resistance data for that exact reagent, not a generic chart. Our HDPE chemical compatibility for mine-site reagents guide walks through how to read compatibility for processing chemistry, and the broader hazardous-chemicals duties sit under the model WHS framework (safeworkaustralia.gov.au).

How to spec containment for your site

Work it in this order:

• List the vessels the bund must serve, and their sizes, then size the required capacity from AS 1940 (largest container + additive share), see the bund-sizing guide.
• Decide fixed or mobile. Vessels that move → a forkable spill pallet. A vessel that stays → a bunded IBC.
• Confirm chemical compatibility against each substance's SDS and the container's resistance data.
• Plan for rain and inspection on an outdoor site, cover or drain routine, and a documented check.
• Match the bigger containment picture, this connects to overall mine-site spill containment and the standards that apply (AS 1940 vs AS 3780 vs AS 4084).

Browse the mining range and IBCs & bulk containers, or send your vessel list, the substances involved and your site's exposure for a spec-backed quote, and we'll help you match the containment to the layout and the standard. Where a specific bunded product isn't in the standard range, we source and import to spec.

Common questions

What is the difference between a spill pallet and a bunded IBC?

A spill pallet is an open bunded base, a forkable platform with a built-in sump, that you place drums or a mobile IBC on top of, so any leak drips into the sump below. A bunded IBC is a bulk container that carries its own integrated containment bund as part of the unit. A spill pallet is flexible (swap what sits on it); a bunded IBC is self-contained for a vessel that stays put.

How big does a spill bund need to be under AS 1940?

AS 1940 (the Australian Standard for the storage and handling of flammable and combustible liquids) requires a compound to contain a defined minimum volume, based on the largest single container plus an additive proportion of the remaining containers, not simply 110% of everything. The exact formula depends on the number and size of containers, so size the bund to the largest vessel and the additive rule, and confirm the current clause. We work the method in IBC bund sizing: what AS 1940 actually requires.

Are plastic spill pallets suitable for mine-site fuels and reagents?

Often, yes. HDPE and polypropylene resist diesel, oils, and many acids and reagents, and unlike steel they don't corrode when a spill sits in the bund. But compatibility is chemical-specific: always check the substance's Safety Data Sheet and the container manufacturer's chemical-resistance data for that exact reagent, temperature and concentration before relying on a plastic bund. See HDPE chemical compatibility for mine-site reagents.

Does a bunded pallet remove the need for a spill kit or procedure?

No. Passive containment (a bund) catches a leak; it doesn't clean it up or handle an overflow, an incompatible mix or a fire. Bunding sits alongside spill kits, SDS-based handling procedures and the relevant storage duties (AS 1940 for flammable and combustible liquids, and the broader hazardous-chemicals duties under Safe Work Australia's model WHS framework), not instead of them.

Sources: storage and handling of flammable and combustible liquids, AS 1940 (Standards Australia), for the required bund/compound capacity method (largest container plus an additive proportion of the remainder); hazardous chemicals duties, Safe Work Australia model WHS framework (safeworkaustralia.gov.au). Container dimensions and static/dynamic ratings are the manufacturer-tested specifications for the referenced BPB model and vary with load distribution and temperature. Bund-sizing figures in the worked example are illustrative of the AS 1940 method, not a compliance calculation, size any containment from the current clause and your actual containers, and confirm chemical compatibility against each substance's Safety Data Sheet. Not a quote.