OSHA Accident Investigation · Summary #14495642
DERRICKMAN,OIL WELL DRILLING,OIL RIG MAST,SCREW JACK,FALL,OIL RIG,UNSTABLE LOAD
Event description
DERRICKMAN KILLED WHEN MAST FELL OVER
Investigation abstract
ABOUT 4:15 AM ON MARCH 30, 1985, THE MAST OF THE DRILLING RIG FELL OFF THE SUBST L PIPE AND 5 STANDS OF DRILL COLLARS WERE RACKED IN THE DERRICK AT THE TIME OF T HE ACCIDENT, MAKING THE MAST TOP-HEAVY AND AT ITS MOST UNSTABLE. RUCTURE AND INTO THE RESERVE PIT. THE DERRICKMAN, WHO WAS WORKING ABOUT 50 FEET ABOVE THE RIG FLOOR ON THE RACKING PLATFORM, DIED AS A RESULT OF INJURIES RECEIV ED WHEN THE MAST FELL. HE MAY HAVE BEEN CRUSHED BY THE DRILL PIPE AND COLLARS RA CKED IN THE PLATFORM, OR HAVE BEEN STRUCK BY SOMETHING ELSE. THE APPARENT CAUSE OF THE ACCIDENT WAS THE FAILURE OF THE WELD WHICH ATTACHED THE ADJUSTING SCREW J ACK TO THE BASE OF THE FRONT (LOAD BEARING) MAST LEG ON THE OFF-DRILLERS SIDE. T HE DRILLING CREW HAD REACHED THE DESIRED DRILL DEPTH THE DAY BEFORE AND WERE IN THE PROCESS OF REMOVING DRILL PIPE FROM THE WELL. ABOUT 62 DOUBLE STANDS OF DRIL
Victim
-
#1 Fatality Age 22 M
- Nature of injury
- 6
- Part of body
- 4
- Event type
- 2
- Source
- 24
- Occupation code
- 999
- Human factor
- 1
- Environmental factor
- 4
- Task assigned
- 1
Codes shown verbatim from OSHA's accident-investigation database. A human-readable decoder is coming in a future release once the accident_lookup2 dictionary is loaded.