Bunded Oil Tank Maintenance: A Complete Year-Round Guide

Regular bunded oil tank maintenance is essential for keeping your fuel storage system safe, efficient, and compliant with UK environmental regulations. Whether you manage a commercial site or rely on oil heating at home, routine inspections and professional servicing can prevent costly repairs, fuel loss, and environmental damage.

In this guide, Oil Tanks Plus explains how to maintain a bunded oil tank throughout the year. We’ll cover seasonal maintenance checks, common risks such as water ingress and sludge buildup, and why professional oil tank servicing and cleaning are critical for long-term performance.

Why Bunded Oil Tank Maintenance Matters

Bunded oil tanks are designed with an outer containment layer to reduce the risk of leaks and pollution. However, even double-skinned tanks require regular inspection and upkeep to remain effective.

Proper maintenance helps to:

• Prevent fuel leaks and environmental contamination

• Extend the lifespan of your oil tank

• Maintain compliance with insurance and environmental requirements

• Avoid fuel contamination and heating system failures

For domestic systems, this oil tank maintenance guide from Your NRG provides a helpful overview of general care principles:
https://yournrg.co.uk/advice-hub/domestic/oil-tank-maintenance-guide

Winter Bunded Oil Tank Maintenance

Cold weather can put additional strain on oil tanks, making winter checks particularly important.

Check for Water Ingress

Inspect the bunded area for standing water. Water can freeze during cold temperatures, leading to cracking, distortion, or long-term structural damage.

Inspect Vents, Filters & Gauges

Ensure vents are clear of ice, snow, or debris and that gauges are functioning correctly. Blocked vents can cause pressure issues and inaccurate fuel readings.

Spring Inspections: Post-Winter Checks

Spring is the ideal time to assess any damage caused by winter conditions.

Look for Cracks or Wear

Inspect the bund walls and tank structure for cracks, bulging, or deterioration that may compromise containment.

Clear Surrounding Areas

Remove leaves, dirt, and vegetation from around the tank. A clear area improves drainage and makes future inspections easier.

For a compliance-focused checklist, this step-by-step bunded fuel tank maintenance guide from ACE Plant is a valuable reference:
https://www.aceplant.co.uk/news-media/bunded-fuel-tank-maintenance-a-step-by-step-checklist-for-safe-and-compliant-storage

Summer Bunded Oil Tank Care

Warmer temperatures increase the risk of internal contamination and condensation.

Prevent Algae & Sludge Buildup

Heat and moisture encourage microbial growth inside oil tanks. Algae and sludge can block filters and damage boilers. Using an approved biocide can help reduce this risk.

Monitor Fuel Levels

Running a tank too low increases condensation, introducing water into the system. Maintaining stable fuel levels helps protect fuel quality.

Autumn Preparations Before Winter

Autumn is the best time to prepare your oil tank for colder weather.

Carry Out a Final Visual Inspection

Check the tank, bund, pipework, and fittings for leaks or corrosion before winter arrives.

Book Professional Oil Tank Servicing

Annual servicing ensures your tank remains safe, efficient, and compliant. This is especially important for commercial installations.

Learn more about professional oil tank servicing and inspections offered by Oil Tanks Plus here:
https://www.oiltanksplus.co.uk/commercial-oil-tanks/servicing-and-inspections/

Why Oil Tank Cleaning Is Essential

Over time, oil tanks accumulate sludge, water, and debris at the base. Without proper cleaning, this buildup can contaminate fuel, damage equipment, and lead to costly breakdowns.

Professional oil tank cleaning removes harmful deposits, improves fuel quality, and extends the lifespan of both the tank and connected heating systems.

Find out more about specialist oil tank cleaning services here:
https://www.oiltanksplus.co.uk/commercial-oil-tanks/tank-cleaning/

Record Keeping & Regular Self-Inspections

Maintaining accurate records of inspections, servicing, and cleaning is essential for:

• Insurance compliance

• Environmental audits

• Identifying recurring issues early

Carry out routine visual checks and log any changes, leaks, or unusual odors immediately.

Conclusion: Protect Your Tank with Proactive Maintenance

Consistent, year-round bunded oil tank maintenance is the most effective way to protect your fuel storage system. Seasonal inspections, contamination prevention, and professional servicing help avoid unexpected failures and costly repairs.

At Oil Tanks Plus, we specialize in oil tank inspections, servicing, and cleaning for commercial and industrial clients across the UK. Proactive maintenance doesn’t just protect your tank — it protects your operations, your compliance status, and your investment.

If you’re unsure about your tank’s condition or need expert support, Oil Tanks Plus is here to help.