Firstly, the spill bund floor is not flat, it normally has a slope 3‰.
which means that, for every 1000 units of horizontal distance, there is a 3-unit rise or drop in vertical height. Take a 40HC DG container for example, the bund floor length is about 12 meters, a 3‰ slope would result in a height difference of 36 millimeters between the two ends. This design ensures that if there is any leak, it can be discharged easily. There are normally two SS316 ball valves at both sides of the container.
Here, we need to know that the Spill Containment’s main function is to store the chemicals safely in case of any leak. So the slope designed is not very big. If the leak needs to be discharged very quickly, or even at the same time the leak happens, the design will be different. It will be another system, another custom container, not the DG storage containers we normally use in Australia. For example, for a custom container lab.
Secondly, the bund capacity requirement.
For readers to check it easily, we made a chart summary as below:
| Dangerous Goods Class, Name | Class 6-toxic substance | / |
| Australian/New Zealand Standard | AS NZS 4452:1997 in section 4.4.1
|
/ |
| Packing group 1 | 100% of the aggregate volume of liquids kept | For instance, if you are storing 2000L packing group 1 chemicals. The spill containment volume needs to be 2000L. |
| Packing Group 2 | 25% of the aggregate volume of liquids
|
For example, if you need to store 12000L packing group 2 chemicals, you need a DG container with 12000*0.25=3000L volume. |
| Dangerous Goods Class, Name | Class 8, corrosive substances |
| Spill Containment | A spill containment sump must hold at least 25% of the total storage capacity or the largest package’s capacity, whichever is greater. does not need to exceed 5000L. |
Thirdly, Bund and the grid floor, raw material, and finishing.
| Raw Material | Finishing | Storage Application |
| Corten Steel SPA-H | Zinc-Rich Primer + Acrylic Topcoat | (Flammable Liquids) – Class 3
(Toxic Substances) – Class 6.1 (Oxidizing Agents and Organic Peroxides) – Class 5 (Corrosive Substances) – Class 8
|
| Stainless Steel 304/316 | Polishing | Class 8: Corrosive Substances, especially for Strong Acids & Strong Bases.
|
Fourthly, what is the bund capacity for different sizes of DG containers?
The bund capacity can be customized. But there is also a production limit. We also made a below chart, so that you can check easily.
| Container Size | Max Spill Containment
Capacity |
Container External Height | Advantage | Disadvantage |
| 20-Foot Container
|
1,800 Liters | 2,591M, a standard 20Ft Container Height | The container cost is relatively lower than the one with a bigger bund volume.
Ocean freight cost is the same as a standard 20 Container. |
The bund capacity is limited, which means you can not store too much chemicals. |
| 20 HC Container | 3,000 Liters | 2,896M, the same height as a 40HC container. | You can store more chemicals which is compliance. You can store 12000L package group 2 chemicals. | Ocean freight costs are higher. Container cost is higher. |
| 40 HC Container | 5,000L | 2,896M | Normally, 5,000 liters capacity is enough. If you need a special one with a higher volume. We can customize it. | |
We offer custom solutions to store your dangerous goods according to Australian/New Zealand Compliance.
Fill the inquire below, we will get back to you within 12 hrs. Thank you~
