Folks, I need to remove an old kerosene storage tank (for central heating) from my in-laws back garden. The tank is moulded plastic, and has a 1,000 litre capacity.
The access point it was originally brought through is gone.
The tank has been empty for 10 years or so, the easiest way to remove it is to cut it up, and the easiest way to cut it up would be with an Angle Grinder.
There is a small amount of liquid in the tank, which is (mostly) water, I'm assured the tank was emptied by professionals.
Obviously I'm worried that there may be residual fuel/fumes that the Angle Grinder could ignite.
Is there any way to quantify the ignition risk, or some anti-philostogen agent (i.e. fire retardant) I can add to the tank that will completely negate the ignition risk?