UK law requires bunded tanks for all non-domestic fuel storage over 200 litres — and our range covers every commercial, agricultural, and construction application. Browse plastic and steel bunded fuel tanks from 1,000L to 10,000L+, with optional pump systems and fuel management. DSEAR compliant. Nationwide delivery from stock.
What is a Bunded Fuel Tank?
A bunded fuel tank is a "tank within a tank" — the inner vessel stores your fuel (diesel, petrol, or kerosene), while the outer bund forms a secondary containment wall that captures 100% of the inner tank's contents should the inner vessel ever fail or leak.
The 110% bund capacity rule is a legal requirement under UK oil storage regulations: the outer bund must hold the entire inner tank volume plus an additional 10% buffer. This buffer accounts for accumulated rainfall and ensures your site remains compliant even during adverse weather.
Without a bunded fuel tank, a single catastrophic leak can cause soil contamination, groundwater pollution, and drainage system damage — triggering Environment Agency enforcement, unlimited fines, and mandatory remediation costs that can reach hundreds of thousands of pounds.
Who buys bunded fuel tanks? Farmers storing red diesel for agricultural machinery, construction companies running plant fleets, commercial depots refuelling HGV fleets, industrial facilities with backup generator fuel, and property managers supplying heating oil boilers.
Types of Bunded Fuel Tanks
Plastic (MDPE) Bunded Fuel Tanks
Medium-density polyethylene tanks are the most popular choice for agricultural and commercial sites. They are rust-proof, UV-resistant, lightweight relative to their capacity, and significantly lower in cost than steel alternatives. MDPE tanks resist corrosion from diesel and petrol and are widely accepted for outdoor use with appropriate siting.
Typical capacity range: 1,000L to 10,000L. Ideal for farms, smallholdings, rural commercial premises, and applications where weight is a logistical consideration.
Steel Bunded Fuel Tanks
Galvanised or mild steel bunded tanks offer a longer operational lifespan, greater physical security (theft-resistance is a significant factor on open construction sites), and better suitability for high-traffic industrial environments. Steel tanks are preferred by fleet operators, quarry companies, and any site where physical damage from plant machinery is a realistic risk.
Steel tanks are also the correct choice for petrol storage, where DSEAR (The Dangerous Substances and Explosive Atmospheres Regulations 2002) requirements for flammable liquid containment may necessitate a fire-rated outer bund.
Skid-Mounted & Portable Bunded Fuel Tanks
Skid-mounted tanks are mounted on a structural steel base that allows forklift or crane relocation — essential for construction sites that move progressively across a project footprint. Portable options range from 1,000L site bowsers to 10,000L self-bunded units that can be craned into position.
Key Features & Specifications
| Feature | Plastic (MDPE) | Steel (Galvanised) |
|---|---|---|
| Capacity Range | 1,000L – 10,000L+ | 1,000L – 10,000L+ |
| Bund Capacity | 110% of inner tank | 110% of inner tank |
| Weight (empty) | Lightweight | Heavy |
| Corrosion Resistance | Excellent (rust-proof) | Good (galvanised coating) |
| UV Resistance | UV-stabilised grade | Painted/coated |
| Security | Lockable fill point | Lockable cabinet + fill |
| Suitability for Petrol | Compatible (check spec) | Yes – fire-rated options |
| Pump Compatibility | 12V, 240V, manual | 12V, 240V, manual |
| DSEAR Compliance | Diesel: standard | Petrol: check | Flammable grade available |
| Typical Lifespan | 10–20 years | 20–30 years |
Compliance & Legal Requirements
The regulatory framework for bunded fuel tanks in the UK is primarily governed by:
- The Control of Pollution (Oil Storage) (England) Regulations 2001 — mandatory secondary containment for any non-domestic oil or fuel storage exceeding 200 litres. The outer bund must contain 110% of the primary container's volume. Applies to diesel, petrol, lubricating oil, and heating oil.
- The Water Environment (Oil Storage) (Scotland) Regulations 2006 — equivalent Scottish legislation with similar bunding requirements.
- The Control of Pollution (Oil Storage) (Wales) Regulations 2016 — Welsh-specific regulations with equivalent secondary containment standards.
- The Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) — applies when storing flammable liquids such as petrol (flash point below 55°C). Requires additional risk assessment, ATEX zone classification, and fire-rated containment in some cases.
- BS 799 Part 5: 2010 — the manufacturing standard for oil storage tanks, specifying construction, testing, and performance requirements.
- OFTEC Technical Standard OFS T100 — the industry installation standard referenced by installers of domestic and light commercial fuel tanks.
- HSE Pollution Prevention Guidelines PPG 2 and PPG 7 — guidance on above-ground oil storage and land drainage control.
Consequences of non-compliance: The Environment Agency can issue unlimited fines, require mandatory remediation of contaminated land and water (often costing £100,000–£500,000+), and bring criminal prosecutions against site owners and directors. Insurers increasingly refuse to pay out for pollution incidents where a compliant bunded tank was not in place.
Domestic triggers for bunding: Domestic properties are also required to use a bunded tank if storage exceeds 2,500 litres, the tank is within 10 metres of inland or coastal water, within 50 metres of a drinking water source, or where a spillage could travel across hard ground to reach a controlled water course.
Industries & Applications
- Agriculture & Farming: Red diesel storage for tractors, harvesters, irrigation pumps, and farm buildings. Farm tanks commonly range from 2,500L to 10,000L. HMRC compliance for marked gas oil (red diesel) also requires controlled, identifiable storage.
- Construction & Plant Hire: Site diesel for excavators, telehandlers, generators, and HGVs. Skid-mounted tanks allow movement with the construction programme. Typically 2,500L–5,000L portable units.
- Transport & Logistics: Commercial depot refuelling for HGV fleets. Steel tanks with fuel management systems and flow meters are the standard configuration.
- Industrial Manufacturing: Fuel and lubricant storage for backup generators, process machinery, and forklift charging areas.
- Property Management & Commercial Heating: Kerosene and heating oil for oil-fired boilers in commercial premises, schools, care homes, and rural properties.
- Utilities & Emergency Services: Standby generator fuel for data centres, hospitals, and critical infrastructure where fuel security is paramount.
Buying Guide — How to Choose a Bunded Fuel Tank
Step 1: Calculate Your Required Capacity
Divide your annual fuel consumption by your expected delivery frequency (typically 4–6 deliveries per year for farms, 12–26 for commercial fleets). Add a 15–20% safety buffer to ensure you never run empty between deliveries.
Example: A farm consuming 8,000L per year with quarterly deliveries needs a minimum 2,000L delivery capacity plus buffer — a 2,500L tank is a comfortable fit.
Step 2: Choose Your Material
Choose plastic (MDPE) if: budget is a primary concern, the site is agricultural or rural, theft is not a significant risk, and the fuel stored is diesel or heating oil. Choose steel if: physical security matters, the site involves heavy plant traffic, or you are storing petrol (flash point considerations).
Step 3: Consider Siting Requirements
UK regulations specify minimum separation distances: tanks must be sited at least 1.8 metres from buildings, at least 760mm from the property boundary, and not within 10 metres of a watercourse, drain, or open sewer. Confirm with your installer before placing an order for a large tank.
Step 4: Pump & Dispensing System
Manual hand pumps are appropriate for low-throughput agricultural use. For fleet refuelling, a 12V or 240V electric pump with a flow meter provides accurate dispensing. Fuel management systems with PIN-entry and digital records are required by some fleet operators for HMRC compliance.
Step 5: Installation
Tanks above 3,500L typically require a concrete base pad. Plastic tanks are lightweight enough for two-person installation below 2,500L; larger tanks require mechanical handling. We recommend OFTEC-registered installers for commissioning and initial inspection.
Frequently Asked Questions
Do I legally need a bunded fuel tank for diesel storage in the UK?
Yes, if you are storing diesel for non-domestic purposes in quantities exceeding 200 litres, The Control of Pollution (Oil Storage) (England) Regulations 2001 requires you to use a bunded tank providing 110% secondary containment. Scotland and Wales have equivalent regulations. Failing to comply exposes you to unlimited Environment Agency fines and criminal prosecution.
What size bunded fuel tank do I need for my farm?
For most UK farms, a 2,500L to 5,000L bunded diesel tank covers seasonal machinery usage with comfortable delivery buffers. Calculate your peak seasonal consumption (e.g., harvest period) and ensure your tank can store at least one full delivery. For large arable operations, 10,000L tanks are common.
Can I store petrol in a bunded fuel tank?
Yes, but petrol storage has additional requirements under The Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) due to petrol's lower flash point (below 21°C). You must conduct a DSEAR risk assessment, classify the storage area as an ATEX zone, and use a tank specifically rated for flammable liquid storage. Contact our team for specialist advice on petrol storage.
What is the 110% rule for bunded tank capacity?
The 110% rule requires that the outer bund (secondary containment) can hold the entire volume of the inner tank plus an additional 10%. For example, a 5,000L inner tank requires a bund capacity of at least 5,500L. This ensures that even if the inner tank catastrophically fails, all fuel is captured within the bunded area without any escape to ground or drainage systems.
Do bunded fuel tanks need to be installed by a qualified engineer?
For domestic installations, OFTEC-registered installers are strongly recommended and may be required by your insurance policy. For commercial installations, a competent person with appropriate knowledge of the regulations should oversee commissioning. Some local authorities may require notification of tank installations above certain capacities.
Why Buy From Spill Control Products UK?
- Specialist Supplier: We are a dedicated spill control and liquid containment specialist — not a generalist safety company. Our team understands the regulations that apply to your storage situation.
- Plastic & Steel Options: Full range in both materials, from compact 1,000L farm tanks to large 10,000L commercial installations.
- Pump & System Bundles: Order your tank with a matched pump system — 12V, 240V, or manual — with flow meters and fuel management options available.
- Technical Sizing Advice: Our team can help you calculate the correct capacity for your site and confirm compliance with applicable regulations.
- UK-Wide Delivery: Tanks delivered from UK stock. Larger tanks shipped on specialist transport with advanced delivery coordination.
- Compliance Confidence: Every tank in our range meets the 110% bund capacity requirement of the Control of Pollution Regulations.
For related products, see our bunded oil tanks for heating oil storage, portable bunds for temporary fuel containment, and IBC spill pallets for bulk liquid storage.
In Stock
