Underground Storage Tank Inspection

Underground fuel tanks provide a safer and more contained way of storing fuel oil on your property. But they are prone to deterioration due to environmental soil conditions. Moreover, due to inaccessibility, they cannot be checked regularly for any signs of damage or leaks. That is why it is advised to get them inspected at least once a year by certified engineers.

Underground Storage Tank Inspection

Network Environmental is a highly experienced company which has a vast team of certified, trained and experienced engineers who carry out underground storage tank inspections on a regular basis. Our state-of-the-art equipment, attention to detail and adherence to regulations ensure the maximum output of the process. You can hire our services through a phone call or our website to get your tank inspected.

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Underground Storage Tank Inspection

Get Thorough Underground Tank Inspection Services

Visual Inspections: Visual inspections are the most basic type of inspection and can be performed by a qualified professional or even the tank owner. During a visual inspection, our engineer will look for signs of damage, corrosion, or leaks on the tank itself, as well as on the foundation and surrounding area.

Pressure Testing: Pressure testing is a more thorough type of inspection that can detect even small leaks that cannot be seen during the visual inspection. During a pressure test, the tank is filled with air or water and then pressurised. If there are any leaks, the pressure will drop over time.

Non-Destructive Testing (NDT): NDT is a type of testing that uses non-invasive methods to inspect the tank for defects. It includes radiography, thermal testing, ultrasonic testing, and magnetic particle testing. These methods can detect cracks, dents, and other defects in the tank shell.

Ventilation and Pressure Relief: During this test, the ventilation and pressure relief systems associated with the tank are inspected to verify that vents are properly installed, free from blockages, and functioning correctly to prevent pressure buildup within the tank.

Monitoring Systems: Our engineers also verify the functionality and accuracy of monitoring systems, such as leak detection sensors, fuel level indicators, or alarm systems. They ensure that these systems are operational and reliable.

Underground Fuel Storage Tank Regulations

Many regulations apply to underground fuel tanks in the UK; some of them are as follows:

Regulations for the Tank Location

  • Underground fuel storage tanks should not be installed in areas with wet ground conditions where the groundwater level may rise above the base of the tank.
  • Underground tanks must be encased in concrete to provide additional protection and stability.
  • It is important to prevent superimposed loads, such as vehicles or walls, from being placed within the protected area of the tank.
  • Locate the tank away from areas where root matter can disturb the concrete case.
  • The extended neck of the tank must extend at least 200mm above the finished ground level.

Regulations for the Tank Installation

  • Allow at least 270mm clearance all around the tank and around 500mm below the tank.
  • Ensure that pumps are used to keep the excavation area dry until the tank installation is complete.
  • Apply haunch concrete, extending 350mm up around the tank’s base.
  • Allow a minimum of 200mm of ground protrusion around the tank to prevent rainwater from entering the tank.

Network Environmental – A Name of Trust and Reliability

Network Environmental always aims to ensure client satisfaction through premium services. Book our highly cost-effective underground storage tank inspection services to get the best out of your storage tank.


Although there are no specific guidelines for that matter, there are a few factors that can help you determine the frequency of your tank inspections, such as the type and age of the tank and environment and soil conditions around the tank.

Typically, fuel tanks should be inspected every three to five years in normal conditions and at least once a year if they are over 20 years old.

Tank inspections can only be carried out by an OFTEC-certified engineer. However, if you do not want a certified engineer to inspect your tank, you will have to notify the local authorities, who will visit the location to inspect the tank.

Regular tank inspections can reveal the deterioration in the tank casing and any other signs of cracks or potential leaks. If you do not inspect your tank regularly, it may result in an unforeseen failure and or leakage of your fuel.

Regular fuel tank inspection can help to prevent these consequences and ensure the safety of your fuel storage system. Also, they can help extend the lifespan of your fuel tanks and improve their efficiency.

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