Four fire engines and 21 firefighters and officers were called to a crane alight in Norman Road in Greenwich.
Approximately half of the crane was damaged by fire. Four people left the industrial site before the arrival of the Brigade.
The Brigade’s 999 control officers took more than 50 calls to the visible fire.
The Brigade was called at 1818 and the fire was under control at 2149. Fire crews from Greenwich, Deptford, East Greenwich and Bexley fire stations attended the scene.
The cause of the fire is believed to be accidental and due to a hot cutting torch flame coming into contact with oil residue.