• Published: 27 Jul 2011
  • Incident ID: 3366

Hoisting line disconnected from drawworks drum

Cause & Consequence

  • Uncontrolled release of a flammable gas or liquid
Incident Consequence

Incident Location

Any Location Type

Incident Activity

Drilling, workover

Incident Info Source


Specific Incident Equipment

Well Service Rig Main Block

Lessons Identified

As per the IADC Safety Alert

Incident Recommendations

The hoisting line (tubing line) clamp was not torqued to 150 foot pounds as per the manufacturer’s



The clamp was reused an undetermined number of times and the clamp’s interior friction surfaces

were worn significantly.


The clamp’s securing bolts were slightly deformed.


The clamp was not visually inspected on a frequent basis in accordance with the manufacturer’s

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