Emergency towing procedure


) PROCEDURES 6.1 General



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BGPO-Emergency Towing Procedure V2
BGPO-TRA-MISC-001parceltransfer201908262137

6) PROCEDURES

6.1 General

      1. Main Engine Failure/Loss of Propulsion/Blackout


In the event that a Seismic Vessel experiences Main Engine Failure, Loss of Propulsion, and /or Blackout, the Tow must be activated immediately. Standby Towing Tug shall be in the close vicinity of the Platform (outside of the 500m exclusion zone) when the Seismic Vessel performs a close pass. The Towing Tug will be on the field all the time during regular operation, so they can be called if non-emergency tow is required.

6.2 Emergency Towing Drill


Before the commencement of the OBN Seismic campaign, a towing drill / exercise is to be conducted. The towing drill exercise aims to test all towing equipment of towing tugs and towed vessels and for the marine crew to familiarize themselves with the towing procedure.
6.3 Pre-prepared towing equipment

  • Master of the Towing Tug vessel shall prepare a 55 ton Shackle connected to the Main towing wire on deck. Tugger winch to be on standby, the 55 ton Shackle is in the open position and ready to receive the polypropylene eye of the Towing Line from the Seismic Vessel. A backup tow line is available on Towing Tug, and the polypropylene eye is open and READY TO CONNECT.

  • Master of the Seismic vessel shall confirm that a towing line rope is in place on his vessel as the primary tow line and that the polypropylene eye is connected to an adequate length of messenger line, followed by a heaving line or PLT (Pneumatic Line Thrower) or LTA (Line Throwing Appliance)* ready for the tow. The messenger line must be strong enough for Towing Tug to retrieve the Towline from Seismic Ship. In addition, areas surrounding the Towing Bollard on the forecastle of the Seismic Ship must be kept clear and ready to release the Towline. Towing Tug is prepared to throw the Heaving line if Seismic Ship fails to pass the messenger line or heaving line.

* pyrotechnics type line thrower/rope launcher -- NOT ALLOWED TO BE USED WITHINN THE 500m zone.

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