NEAR MISS – DROPPED SIX POUND SLEDGE HAMMER
WHAT HAPPENED:
During drilling operations it was noticed that the vibrating hose connecting the sections of stand pipe between the strong back and mast stem was leaking. The rig shut down and removed the damaged vibrating hose while waiting for a replacement to arrive on location. Prior to installing the replacement hose, the derrickman retrieved the stop drop tool kit and other required tools. A six pound sledge hammer with a tethered tool lanyard was selected and clipped to his boatswain belt; he then raised himself into position with the “man rider.” While being raised the sledge hammer hung up under a mast girt causing the ring on the tool lanyard to fail, this allowed the hammer to fall approximately 20 feet to the rig floor. The hammer landed by the iron roughneck, about 10 feet away from the flagger who was positioned on the driller’s side of the setback area.
WHAT CAUSED IT:
The hammer was not properly stowed to the body while being raised into position. The derrickman nor the spotter noticed the hammer hung under the girt while being raised into position.
CORRECTIVE ACTIONS: To address this incident, this company did the following:
Hoisted personnel shall properly stow the tools to their body while being raised into position. A small carabineer can be secured to the harness and the working end of the tool should be fastened to the carabineer via the tethered lanyard while being raised into position. The tool shall not hang below the hoisted person. More than one spotter may be necessary when a person is being hoisted throughout the mast. The drop tool kit is equipped with a tool bag that could also be used to stow the tools until reaching the desired working position.