• Published: 24 May 2011
  • Incident ID: 3160

Failure of drawworks disc brakes results in dropped blocks

Cause & Consequence

  • Moving, flying or falling object
Incident Consequence

Incident Location

Onshore construction/rig repair yard

Incident Activity

Catering / hotel services

Incident Info Source (alert

Specific Incident Equipment

Drawworks disc brakes,KEMS software upgrade, Elmagco brake interface, Crown'o'matic interface

Lessons Identified

Rigs equipped with disc brakes equipped with anti-bird nesting functions should be alerted to the potential problems arising from incorrect installation of hydraulic control valves. READ MORE ON NOPSA ALERT 19

Incident Recommendations

Commissioning procedures for modifications to existing facilities should be reviewed to ensure: Commissioning is carried out on a complete system basis, as well as on the system interfaces. User training is adequate to obtain sound knowledge of the upgrade and its impact and interactions with other facility systems. READ MORE ON NOPSA ALERT 19

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