The incident occurred on 09 July 14 around 9.30 am.
The SCC subcontractor worked on top of the tank V4205 for flange reinstatement activities. He used a brass hammer weight approx. 8 pounds to hit the wrench for tightening nuts. During he put a hammer on the grating floor which has a small hole between nozzle and grating, a brass hammer was fell down from height approx. 25 meters to hit to the safety helmet and upper back of the TMIS worker who was standing on the M Road near the tank. The co-worker called the ambulance of Thai Oil and sent the injured person to Thai Oil First Aid Room. Her back was bruised but not a serious injury. After being given her a first aid treatment, she was allowed to back to work.