The reasons for fuel tank cleaning can be in response to either a contamination issue, or simply to be pro-active in ensuring that your fuel stocks remain in good condition. This particular case came from a tank cleaning client who first approached us around two years ago to perform fuel tank cleaning on some underground tanks that were redundant. On this occasion, the diesel tank is situated on one of their 30+ forecourts and is crucial to the continued running of the garage. The tank has had been suffering from a sludge contamination issue, with dispensing filters blocking on a regular basis, causing disruption to the operation.

We were informed that water tests had been carried out on the tank and that water was not found, however this had been conducted from the dispensing pumps and not in the tank itself. In addition to the water tests, additives had been introduced into the tank to try and alleviate the problem. Whilst additives can certainly help to reduce the level of contaminants found in fuel stocks, there comes a point where fuel tank cleaning simply cannot be beaten to ensure the operation runs smoothly.

The tank that required cleaning is over 20 years old with quite a restrictive access chamber leading to the fill and dispensing pipework.

Underground Tank Lid

Tank lids are often in dirty and confined chambers

However with a little cleaning, the correct tools and some perseverance, even the most awkward of tank lids can usually be disconnected and removed without the need to cut through any pipework. This allows the team to begin preparations to carry out the fuel tank cleaning process.

Underground tank lid removed

The lid will also be cleaned up and a new gasket applied.

 

Cleaning a diesel tank

A view into the diesel tank during the cleaning process.

Inside an underground tank

Notice the lighter area where water has been residing

The level of contamination in the tank was high, with approx 150 kilos of sludge being removed, along with approx 30 litres of water. The issue with this tank as you can see from the picture above is that the water is residing at the side of the striker plate so wouldn’t be removed even if a probe was put down the fill pipe. That water will then continue to support micro-biological growth, which results in downtime for the operator.

The fuel tank cleaning process on this particular site began at approx 8am, with a small area of the site cordoned off to exclude the general public. By 10am, the tank had been opened, any residual fuel (approx 500 litres in this case) had been removed, and the tank cleaning procedure was well under way. By 1pm, the tank had been fully cleaned and inspected with the lid replaced.

Tank lid replaced

The tank lid is replaced with a new gasket and new bolts.

In addition to proving the fuel tank cleaning service, we are able to offer a full on-site fuel testing suite, fuel polishing and tank testing to ensure you are left with peace of mind that your operation is clean and up to scratch.

To read more about our underground tank cleaning services, please click here.