Fuel storage tanks are an essential component for storing large quantities of fuel, whether it is for commercial or personal use. Tanks will come in various materials, including plastic and steel. Both materials offer different benefits and drawbacks, and it is important to understand the differences between them to determine which type of tank is right for your needs.

In this article we will cover 5 points of difference with a plastic fuel tank and a steel fuel tank;

Durability, Cost, Maintenance, Environmental Impact and Regulations.

Durability

When it comes to durability, steel tanks are the clear winner. Steel tanks are incredibly strong and can withstand harsh weather conditions and external damage. They are also more resistant to fire and explosions, making them ideal for industrial settings. In comparison, plastic tanks are more prone to damage from external factors including UV exposure, extreme temperatures, and harsh weather conditions. However, plastic tanks are lightweight, making them easier to transport and install.

Cost

The cost of a fuel storage tank is an important consideration for many people. Generally, plastic tanks are more affordable than steel tanks. This is because plastic is a less expensive material than steel, and plastic tanks are easier and less expensive to produce. However, steel tanks are more durable and have a longer lifespan, so they may be more cost-effective in the long run.

Maintenance

Both plastic and steel tanks require regular maintenance to ensure that they remain in good condition. However, the maintenance requirements for each material are different. Steel tanks require regular cleaning and painting to prevent corrosion and rust, while plastic tanks only require cleaning to remove debris and sediment. In addition, plastic tanks are less likely to develop leaks, which can reduce the risk of contamination.

Environmental Impact

The environmental impact of a fuel storage tank is an important consideration for many people. Steel tanks are generally more difficult to recycle and can have a larger carbon footprint than plastic tanks. Plastic tanks on the other hand, are lightweight and can be recycled more easily, making them a more environmentally friendly option.

Regulations

There are various regulations governing the installation and use of fuel storage tanks, and it is important to ensure that your tank complied with these regulations. In some cases, regulations may require the use of one material over the other. For example, some areas prohibit the use of plastic tanks for certain types of fuel, including diesel.

Conclusion

In conclusion, both plastic and steel fuel tanks have their own benefits and drawbacks. When selecting a fuel storage tank, it is important to consider your specific needs and budget, as well as any applicable regulations. By carefully weighing the pros and cons of each material, you can select the type of tank that is best suited to your application.
If you have any further questions or are unsure whether a plastic or steel tank is best for you, feel free to get in touch.

Take advantage of the new tax deduction for all businesses

New assets - Investment Boost

From 22 May 2025, businesses can claim 20% of the cost of new assets as an expense, then claim depreciation as usual on the remaining 80%.

What you can claim for

From 22 May 2025, businesses can claim a 20% tax deduction on the cost of new or new-to-New-Zealand assets that are depreciable and available for use on or after that date. Eligible assets include:

New commercial/industrial buildings
Improvements to depreciable property (excluding residential buildings)
Primary sector land improvements
Assets from petroleum or mineral mining development (not permits or rights)
Mixed-use assets

There’s no cap on the investment amount you can claim under this Investment Boost initiative.

How much petrol or diesel can I store on my farm in a single-skinned tank?

If the site is zoned 'Rural' and is a minimum size of 4 hectares, the maximum diesel storage quantity is 1,000L for single skin tanks. Aside from this, the legislation does state, "If the fuel is stored so a spill will not endanger buildings, streams or water bodies, these requirements are only needed if you store 2,000L of diesel." In other words, you could store up to 1,999L of diesel on your farm in a single skin tank of you meet these conditions.

If storing 2,000L or over, you will need a self-bunded tank.

Click here to see what Worksafe say to help you further.

What can I do to prevent fuel theft on my farm?

A range of options are available, depending on the fuelling system on your tank. To deter fuel theft, it's important to keep your tank out of sight—placing it where it can't be seen from the road is a key step. Using lockable fill caps, installing security lighting or cameras, and placing physical barriers like fences or locked enclosures around the tank are just some measures we've seen clients take. For electric pumps an isolating switch can be located in a secure locked area, eg. in a nearby shed where the power is sourced from.

Fuel theft continues to be a major issue in all parts of the world. As thieves are finding trucks and vehicles harder and harder to steal worthwhile quantities of fuel from, they are therefore targeting farms, building sites and depots that aren't manned or safeguarded. Another reason why fuel theft has risen over the years is possibly in relation to the rise in fuel prices. As the cost of diesel increases, so does the chance of criminals targeting an exposed fuel tank.

Click here to see 10 ways to prevent fuel theft on your farm.

What is a self-bunded tank and what advantages does it have compared to a single skin tank?

These tanks are also known as 'double-skinned' tanks. They are designed with the inner (primary) tank being encased by an outer (secondary) tank which will contain the total volume of the primary tank should it ever fail. This design ensures compliance if you require larger amounts of fuel to be stored. Self-bunded tanks have an air cavity between the tanks and this also reduces the possibility of condensation which is an added benefit meaning better quality fuel for longer.

An alternative to a self-bunded tank is to have a single skin tank in an open bund. This is legal and can be a well-priced option, however the bund will collect water and fuel residue, and can tend to get quite messy. It is worth to note that any bund residue is deemed contaminated and must be disposed of correctly.

Click here for more information on bunding or secondary containment requirements.

What separation distances are available to allocate and track fuel taken to individual vehicles?

A simple mechanical or battery-operated flowmeter can be installed in the fuel line to record the quantity of fuel taken at each transaction . This can be recorded in a notebook. Electronic fuel management systems are available which also provide extra security where the pump won't start until a valid PIN number or electronic key tag is presented. This system also records the date, time, operator ID, vehicle ID and fuel quantity taken which can be uploaded to an electronic software system or website for allocation and reporting.

What is the largest size tank I can have on site without having certification for the tank?

DIESEL tanks under 5,000L don’t need certification, however 60L or over, connected to a burner and or 500L and over connected to a stationary engine, DO need certification. Also tanks must still be located in line with the required separation distances depending on the tank capacity and the fuel type it holds.

Click here to learn more about varying sizes of tanks and what site compliance may apply to you.