An old heating oil tank can look acceptable from a distance, but the real condition is often seen around the base, lower section, outlet area and pipework.
On this job in Slane, the replacement was not just a case of swapping one tank for another. The old tank had to be emptied, removed, the base area prepared, and the new tank fitted with proper support and connections.
That is the correct way to deal with an ageing domestic oil tank.