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HSE Policy
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2025 Second Alert HiPo#32 Electrical overhead line trip during rig move
During Rig move activity of Rig main carrier along the graded road between Rahab and Ghanuq, the rigconvoy passed beneath an 33kV overhead power line (OHL) before the Rahab–Dhiab road junction. Due to a steep road gradient, the rig carrier was unable to proceed forward, and the team decided to reverse it to a safer position. While reversing, the rig carrier came to a halt directly beneath the OHL (12.08 mtrs). In an attempt to stabilize and realign the carrier on the slope, the crew activated the hydraulic jacks to support the carrier. While engaging the jacks , the rear top point of the carrier possibly entered in the electromagnetic field of the energized OHL and tripped the power resulting in a deferment.
Always ensure all pre-move hazards identified in surveys (especially OHL isolation and support-equipment readiness) are verified and closed before movement. Always ensure dynamic risk assessment is conducted whenever conditions change, such as delayed equipment, darkness, or terrain deviation. Always ensure goalposts or kicker bars are installed and physically checked at every OHL crossing and get necessary clearances. Always ensure Stop-Work authority is exercised when safety barriers or conditions are compromised.
Rig move route survey and pre-move assurance verification; the associated risk related to the powerhead lines were clearly identified but the risk of interference with the powerline magnetic field due to low clearance was overlooked ( only 1.18 mtrs) No physical barrier (goalpost/kicker bar) was installed to control proximity to the OHL. The Overhead line was not deisolated while the rig was passing under the load. No power-isolation confirmation was obtained prior to passing under OHL. Unsafe decision to park and stabilize the carrier beneath energized lines without reassessment or updated risk controls
Category:
Second Alerts
Document Type:
Operational Safety
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