Petrol Storage Tanks

Below-Ground Double Skinned Petrol Storage Tanks

Cookson & Zinn have been designing and manufacturing underground double skinned Petrol storage tanks for almost 20 years.

Petrol Station Main

The storage of petrol due to it volatility is highly regulated and controlled by legislation:

Due to the restrictions and precautions required to store petrol above ground, it is most common to store large volumes of petrol in underground storage tanks (UST’s)

To ensure the tanks fulfil these requirements, all Cookson & Zinn underground storage tanks are fully tested and certified to comply with BS.EN.12285-1:2018 specification.

Tanks are externally grit blast cleaned to SA 2.5 followed by a coating of solvent-free polyurethane.

The coating undergoes 100% pin-hole high voltage spark detection test to confirm the external coating has fully encapsulated the external steel skin.

Capacity Icon

Capacities from 5,000L to 150,000L

Single Multi Icon

Single Or Multi Compartment

Leak Detection Icon

Leak Detection System

Surface Coating Icon

Variety of surface coating to suit all requirements

Electric Icon

Fully Certified

Double Skinned Icon

Double Skinned

Deuma Process Icon

Deuma Process

Horizontal Tanks

The natural choice for the bulk storage of petroleum products, complying with health & safety, environmental and hazardous materials requirements is our double skinned storage tanks.

For over 40 years Cookson & Zinn have been supplying these tanks to oil companies, supermarket retailers, independent / dealer operated sites and motorway petrol filling stations.

Features Included:

  • Capacities from 5,000L to 150,000L
  • Designed to BS EN12285-1
  • Deuma Process
  • In-house blast and paint facilities
  • Double Skinned
  • Range of Specialised Internal Linings Available
Underground Petrol Storage Tanks
Underground Tank Illustration

BaseFrame Addition

Innovation is at the core of everything we do. We are always listening to our customers and stakeholders.

We were asked to come up with a solution to the on-site health and safety challenges of installation engineers climbing onto tanks to fit crane hooks and being in the excavations while tanks are being lowered into them.

Our solution was the innovative “BaseFrame

Features Included:

  • Structural base frame with supporting cradles and holding down straps
  • Guide steering ropes for offloading tanks removing the need enter the excavations
  • Reinforcing bars and mesh
  • Offloading slings and shackles

Features & Benefits:

The tanks are levelled at the factory and provide a flat firm surface to install on-site

Reduces site workload and ensures accurate orientation

Base Frame ensures that tanks cannot roll in the excavation

 Major safety risk eliminated

Factory fitted holding down straps eliminating the necessity to lay them under the excavation base

Time saving

When the tank arrives on site the contractors’ personnel can attach crane hooks at ground level rather than climb ladders to attach slings. (see operation sequence below)

Time saving and health and safety benefits

Minimum site base supports needed for the tank prior to concrete pour and backfill

 Material and time savings on site

Allows concrete pour from the top of the excavation

Major safety risk eliminated by not requiring personnel to be inside excavation when tanks are installed

Tank location marks/brackets can be placed in position by the contractor and these positions can be clearly seen from the top of the excavation

Improves ease of installation


The introduction of Biofuels has dramatically increased the incidence of microbial build up in underground storage tanks. This is largely due to the water content in these fuels collecting at the bottom of tanks providing a perfect environment for bacteria to grow.

The result is blocked filters and potentially fuel that is not within specification. Regular tank cleaning and special treatments can be used to minimize the problem, but these are all significant recurring costs, and can lead to the tanks being out of commission for significant periods.

The Bio Base addresses these problems by incorporating the health and safety benefits of the Build base with additional features to ensure your fuel remains in perfect condition.

Features Included:

  • 1-200 slope incorporated into the tank to ensure any water contamination flows to one end of the tank
  • Integrated bunded sump to collect any water
  • Contamination extraction pipe fitted to ensure ease of removal
  • Convenient and safe way to regularly check for any potential contamination
Biobase Drawing


A cost effective alternative to conventional underground tank installation.

The canopy is supported directly on the tank and, by utilising external reinforcement rings and supporting cradles, the canopy-imposed loadings are deflected from the tank body.

By using sophisticated, finite element analysis on all load bearing features, all critical load bearing points are identified and stress points eliminated.

Features Included:

  • Cost effective alternative to conventional system
  • Total flexibility in site layout
  • Substantial reduction in installation time and cost


The PetroTainer stackable, above or below ground storage tank offers the benefits of a high quality double skinned tank that can be shipped cost effectively virtually anywhere in the world.

By using the ISO shipping frame, the PetroTainer frame allows the tank to be shipped as container freight with significant cost savings and ease of handling.

It also aids the location and orientation of the tank during installation where installation cost can be reduced and site safety improved

Features Included:

  • Cost effective alternative to conventional system

Reach Out To Us If You Are Interested In Our Petrol Storage Tanks

Sign Up To Our Newsletter For The Latest News & Services

Please enable JavaScript in your browser to complete this form.