---
title: "Choosing a spill pallet"
url: https://fortitude21.com/choosing-a-spill-pallet
language: en
description: "How to specify a spill pallet: size the sump to your site's rule, read static, dynamic and racking load ratings, pick polyethylene or steel, match the ramp."
---

# Choosing a spill pallet

Sump capacity, load rating and material, and the way each of the three gets read wrong.

*Sump capacity, load rating and material decide the pallet.*

A spill pallet is bought on three numbers: sump capacity, load rating and material. Each one has a way of being read wrong, and the wrong reading produces a pallet that passes at purchase and fails at inspection.

**Quick answer:** How big does a spill pallet sump need to be?

Big enough for the larger of two figures in your site's rule: a share of the largest container, commonly 110 per cent, or a share of everything stored, commonly 25 per cent. Four 205 litre drums need about 226 litres, set by the largest drum; for ten 20 litre jerricans the total sets it, at 50 litres.

## Start with the rule, not the pallet

The sump capacity you need is set by the regulation that governs your site, and it is decided before you look at a single product. Two formulas are in use and they give different answers. The first is a percentage of the largest single container in the store, commonly 110 per cent. The second is a percentage of everything stored, commonly 25 per cent. Where both appear, the requirement is whichever is greater.

In England the text is the Control of Pollution (Oil Storage) (England) Regulations 2001. They apply to oil stored outside a building in any container of more than 200 litres, and allow drums on a drip tray to use 25 per cent of their combined capacity. In the United States it is the EPA SPCC rule at 40 CFR 112, which asks for containment that is sufficiently impervious and sized to the largest container, with OSHA 1910.106 governing the workplace store on top of it. In Australia no national law sets a figure: state guidance does, led by EPA Victoria’s Publication 1698, and AS 1940 and AS 3780 are the standards regulators call up for flammable liquids and corrosives. The European Union has no single instrument: containment is written into national water-protection law. Germany’s WHG and AwSV are the most detailed of them and the usual benchmark for a supplier quoting into Europe.

Work an example before you shop, because the two formulas cross over sooner than people expect. Four 205 litre drums hold 820 litres. Twenty-five per cent of that is 205 litres; 110 per cent of the largest drum is about 226 litres. The largest-container rule wins, narrowly. Now make it ten 20 litre jerricans: the total is 200 litres, 25 per cent is 50 litres, and 110 per cent of a single can is 22 litres. The English regulations do not reach containers that small, but bund the store anyway and the total-volume figure wins by more than double. A store of small containers is almost always governed by the total, which is exactly the case where buyers reach for a drip tray and come up short. The [spill pallet sizing calculator](https://fortitude21.com/spill-pallet-sizing-calculator) works it out for your own mix and lists the pallets that pass.

*Four 205-litre drums: 226 litres from one drum beats 205 from the total. Ten 20-litre cans: 50 litres from the total beats 22 from one can.*

## Sump capacity is not the footprint

Two pallets with identical external dimensions can differ by a factor of three in the volume they hold. A 132 by 66 cm two-drum unit at 15 cm high holds 80 litres; the same footprint at 43 cm holds 260. The number on the drawing that matters is the sump, and it is the one a cheap listing leaves out.

*The two-drum units share a 132 by 66 cm footprint and the four-drum units about 130 by 130 cm. Height decides the volume, so read the sump figure rather than the outline.*

Two things eat that capacity after purchase, and both are inspection findings rather than design faults. The first is a second layer of drums going on top of a pallet sized for one layer, which doubles the stored volume without changing the sump. The second is the sump being used for storage: absorbent, a funnel, a spare pump. Nothing about the product says either is a problem, which is why they keep happening.

## Reading a load rating

Three conventions appear across this category and they are not interchangeable.

- **Static** is the pallet standing still, loaded, on a flat floor.
- **Dynamic** is the pallet lifted and moved while full, on forks or a pallet truck. It is always the lower figure and it is the one that governs anything that moves.
- **UDL** is a uniformly distributed load, spread evenly across the deck. Four drums on a four-drum pallet approximate that. One drum in a corner does not.
- **Racking load** is a separate rating and a separate product. Only a pallet specifically rated for racking may go in a rack, and the figure is typically a fraction of the floor rating: 500 kg on a four-drum pallet rated 3,000 kg static.

Ask for the test basis. A published load figure is the output of a test regime, and the regime is what makes it comparable between two suppliers.

## Deck or pallet

The two formats answer different questions. A low deck, 10 to 15 cm high with an open grate, is for drums in use: decanting, dosing, being worked several times a day. The 10 cm trays take a drum walked on by hand and the 15 cm decks have a matching ramp, and the grate lets an operator see standing liquid on a walk past. Its sump is small by design, usually 30 to 170 litres.

A spill pallet, 20 to 60 cm high, is for drums in storage. It holds a burst drum rather than a drip, and the sump volume is the product. The 202 litre single-drum pallet holds a 200 litre drum failing completely. A 110 per cent rule asks more: 220 litres for a 200 litre drum and about 226 for a 205 litre one, so check the sump against your rule before you choose.

The common mistake is buying decks for a store because they are cheaper and load more easily, then discovering at audit that the combined sump falls short of a percentage-of-total rule. Deck for the working position, pallet for the store.

*A deck sump of 30 to 170 litres catches drips from a drum being decanted. Only a pallet sump holds what a failed drum releases.*

## Polyethylene or steel

Polyethylene resists most acids, alkalis and water-based chemicals, will not rust, and is a fraction of the weight. It covers most of the market and it is what you should specify unless something rules it out.

Two things rule it out. The first is a fire assessment: a flammable liquid store assessed against a fire scenario cannot have a combustible bund in it, and steel is the only answer. The second is solvents, which craze polyethylene that holds detergent without trouble.

Steel has its own limit. It is non-combustible, not inert. Acids and some aqueous salts attack both galvanising and powder coat, and a corroded sump leaks at the seam where nobody is looking. Specify the finish against the contents: hot-dip galvanising for outdoor life and general service, powder coat where the colour codes the contents or the finish has to match a chemical.

Whichever you choose, ask the compatibility question of the bund on its own terms rather than inheriting the answer from the container. A sump meets its contents neat, at whatever temperature they were at, with no closure limiting evaporation and often with rainwater already in it changing the concentration. A material rated for storing a chemical is not automatically rated for catching it.

*Polyethylene covers most acids and alkalis, not every one. Check the bund against the liquid neat and warm, as a spill reaches it, with rainwater already in the sump.*

## Getting the drum on and off

A filled 200 litre drum weighs around 200 kilograms and will not go up a 30 cm step. A store with no ramp is a store where the pallet stands empty and the drums sit on bare floor, which is the most expensive way to fail an inspection.

Match the ramp to the pallet height, not to the drum. It is the one dimension that gets guessed, and a 15 cm ramp against a 30 cm pallet is a step with a slope in front of it. Pallet heights in a typical range run 10, 15, 17, 20, 30, 43, 50, 60 and 70 cm, and only some have a matching ramp, so quote the two together. Where the drum is being moved rather than loaded once, a dolly with its own sump keeps the containment under the drum in transit instead of leaving it behind on the pallet.

## Outdoors, rain is the design problem

An open bund left outside fills with rain, and a sump full of water has no capacity for the spill it exists to catch. So it has to be drained, and the moment it is drained it becomes a discharge route to the environment it was protecting.

The answer is a manually operated valve kept locked shut, opened only after someone has inspected what is in the sump, with contaminated water removed as waste. In the UK that valve is not an option for oil: the oil storage rules bar any valve or opening used to drain the bund, so the water is pumped out instead. An automatic drain defeats the purpose: it discharges fuel as readily as rain. Freeboard on top of the working capacity is what buys the time between inspections, and a cover is the cheapest way to stop the problem arising. A PVC tarp sized to a pallet you already own costs a fraction of replacing it with a covered unit, and it ships flat.

*The UK oil storage rules bar any valve or opening used to drain an oil bund, so there the water is pumped out. The US SPCC rule allows a bypass valve kept sealed shut, opened under supervision and recorded.*

## IBCs change the arithmetic

A 1,000 litre IBC makes the containment the largest single line on the order, and the percentage rule turns into a four-figure sump. Two features exist for that. Linkable pallets carry bulkhead fittings that pass liquid between neighbouring units, so a row of 250 litre sumps behaves as one volume and reaches a total-stored figure that no single pallet would.

*Under the English rule four IBCs need 1,100 litres, 110 per cent of one tank. Linked 250-litre sumps act as one volume: four fall short at 1,000, five clear it at 1,250.*

Height decides whether the store is workable: every tap, sample and hose connection on an IBC happens at the outlet, and a pallet that puts the outlet above chest height buys sump volume at the cost of a ladder.

Cage dimensions vary between tank makers. A pallet that fits a 1,000 litre tank from one supplier can foul the cage feet of another, so quote against the tank you run, not the nominal litre figure.

## What gets left off the order

- **The ramp.** Bought three weeks later at full freight, on a pallet that could not be loaded.
- **The cover**, on any store that is outdoors.
- **Absorbent within reach.** Containment buys time; it does not clean anything up.
- **A salvage drum**, if anything on site holds a dangerous good. A split drum cannot be lifted, rolled or moved, and an overpack is the only thing that gets it off the premises.
- **The drain plug version**, on anything outdoors where the rules allow one. A UK oil bund may not have a drain, so plan to pump it.

## Match the containment to the store

We make a product for each of these jobs.

| Your use case | Recommended can | Why this one |
| --- | --- | --- |
| Drums being worked daily | [Drum Spill Decks](https://fortitude21.com/product-drum-spill-decks) | Low enough to load by hand, with a grate that shows a leak. |
| Drums in storage | [Drum Spill Pallets](https://fortitude21.com/product-drum-spill-pallets) | Sumps to 488 litres, rackable and modular versions. |
| IBC tanks | [IBC & Multi-Container Spill Pallets](https://fortitude21.com/product-ibc-spill-pallets) | Linkable sumps pool capacity to reach a total-volume rule. |
| Fire-assessed stores | [Steel Spill Pallets](https://fortitude21.com/product-steel-spill-pallets) | Double-layer 3 mm steel where a plastic bund is ruled out; check the 203 to 216 litre drum sumps against a 110% rule. |
| Benches and pails | [Bench Trays & Drip Trays](https://fortitude21.com/product-bench-and-drip-trays) | From a 4 litre bench tray to a 145 litre pail pallet. |
| Loading the pallet | [Spill Pallet Ramps](https://fortitude21.com/product-spill-pallet-ramps) | Sized to pallet height, which is the dimension people guess. |

## Common questions

### How big does a spill pallet sump need to be?

Whatever your regulator asks for, which is either a percentage of the largest single container or a percentage of everything stored, whichever is greater. England writes 110 per cent of the largest and 25 per cent of the total for containers over 200 litres, and allows 25 per cent for drums on a drip tray.

The US SPCC rule asks for containment sized to the largest container. Where you bund small containers, the total-volume figure usually governs, which is where buyers undersize.

### What is the difference between a spill deck and a spill pallet?

Height and sump volume. A deck is 10 to 15 cm with a small sump, low enough to load a drum by hand or up a short ramp, and it is for drums being worked. A pallet is 20 to 60 cm with a sump that will hold a burst drum, and it is for drums in storage.

Buying decks for a store is the common error, because they are cheaper and easier to load.

### What does the dynamic load rating mean?

The weight the pallet is rated to carry while it is being lifted and moved on forks or a pallet truck, as opposed to standing still. It is always lower than the static figure, and it is the one that governs anything mobile. A separate racking rating applies only to pallets specifically built for racking.

### Can I put a spill pallet in pallet racking?

Only if it is a rackable model, and only to its racking load, which is typically a fraction of its floor rating. A four-drum pallet rated 3,000 kg static may be rated 500 kg in a rack. A standard pallet that happens to fit the beam spacing is not a rackable pallet.

### Polyethylene or steel?

Polyethylene unless something rules it out. It resists most acids, alkalis and water-based chemicals, will not rust, and weighs a fraction as much. Steel is for a store assessed against a fire scenario, where a combustible bund is not permitted, and for solvents that craze polyethylene. Steel is non-combustible but not inert, so match the finish to the contents.

## References

The standards and regulations this page relies on, at their issuing body. Where a market rule is named here, check the current revision before you specify against it.

- [The Control of Pollution (Oil Storage) (England) Regulations 2001](https://www.legislation.gov.uk/uksi/2001/2954)
- [Defra / Environment Agency — guidance note for the oil storage regulations](https://assets.publishing.service.gov.uk/media/5a789bf2ed915d07d35b1066/pb5765-oil-storage-011101.pdf)
- [NFPA 30: Flammable and Combustible Liquids Code](https://www.nfpa.org/codes-and-standards/nfpa-30-standard-development/30)
- [OSHA 29 CFR 1926.152: flammable liquids and safety cans](https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.152)
- [ECHA: REACH regulation](https://echa.europa.eu/regulations/reach/understanding-reach)

First published 23 September 2026

Last reviewed 26 October 2026 by [David Guru](https://fortitude21.com/david-guru), Co-Founder & Business Development Director. [How we review our guides](https://fortitude21.com/editorial-policy) Fortitude21 makes and sells liquid containers; our guides carry no affiliate links.