When it comes to storing oil, whether it's for domestic or commercial purposes, selecting the right type of oil tank is critical. Two common options available in the market are bunded oil tanks and single skin tanks. In this blog post, we will explore the fundamental differences between these two tank types, their advantages, and disadvantages when choosing the most suitable option for your oil storage needs.

What is a Bunded Oil Tank?

A bunded oil tank consists of two layers: an inner tank that holds the oil and an outer layer with a protective wall known as the bund. The bund serves as a secondary containment system, designed to prevent any leaking oil from reaching the surrounding environment. The space between the inner tank and the bund acts as a safety zone, providing an added layer of protection in case of a failure or damage to the primary tank.

In Northern Ireland, installing a bunded oil tank is not mandatory unless you plan to store more than 2500 litres of oil. However, if you exceed this amount, it becomes a legal requirement to have a bunded oil tank in place.

Single Skin Storage Tanks

On the other hand, single skin tanks consist of a single layer and do not have the additional protective bund. They are simpler in construction and typically less expensive compared to bunded tanks. Single skin tanks have been used for oil storage for many years and are commonly found in older buildings or smaller applications. Single skin oil tanks typically come with a 2-year manufacturer's warranty, whereas bunded oil tanks come standard with a 10-year manufacture warranty.

Safety and Environmental Considerations

One of the key advantages of bunded oil tanks is their enhanced safety and environmental protection. The double-layered design significantly reduces the risk of oil leakages, which can have severe consequences on the environment, groundwater, and surrounding areas. In the event of a failure in the inner tank, the bund acts as a containment barrier, preventing any oil spills and giving you time to address the issue before it becomes a major problem.

Single skin tanks, on the other hand, do not offer the same level of protection. While they are suitable for certain applications, they are more prone to leakage as they lack the secondary containment system. This poses a higher risk to the environment and could potentially lead to legal and financial liabilities.

Regulations and Compliance

Due to the risks associated with oil storage, there are strict regulations in place governing the installation and use of oil tanks. Bunded oil tanks generally meet or exceed these regulations and are considered a reliable option for compliance. Building codes and environmental agencies often recommend or require the use of bunded tanks to ensure proper containment and minimise environmental risks.

Single skin tanks may not meet the same regulatory standards in certain jurisdictions. It is essential to check with local authorities and comply with the relevant regulations before choosing a single skin tank, as they might necessitate additional safety measures or restrictions.

Construction and Longevity of Oil tanks

Bunded oil tanks are typically constructed with durability and longevity in mind. The double-layered design, combined with robust construction materials, makes them more resistant to external elements, corrosion, and damage. They are built to withstand harsh weather conditions and have a longer lifespan compared to single skin tanks.

Single skin tanks, although simpler in design, may be more prone to corrosion over time. External factors such as weather, soil moisture, and physical impacts can expedite their deterioration process. Regular maintenance and inspection are essential to ensure the structural integrity of single skin tanks.

Conclusion

Choosing the right type of oil tank involves careful consideration of safety, environmental impact, regulatory compliance, and longevity. While single skin tanks might be suitable in certain circumstances, bunded oil tanks offer superior safety features, environmental protection, and reliability. Investing in a bunded oil tank provides peace of mind, mitigates potential risks, and ensures compliance with regulations. Remember to consult with industry professionals and local authorities to determine the most appropriate option for your specific oil storage requirements.

In certain jurisdictions there are grants offered to low income family's or if your oil boiler is older than 15 years. If claiming a grant as part of an oil tank replacement, a bunded oil tank is a legal requirement.