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Concepts

Girding

Girding is the dangerous condition in which a tug is pulled sideways or stern-first by towline force and loses the ability to recover its heading. If the heel increases far enough, the tug may capsize.

Definition

Girding is the dangerous condition in which a tug is pulled sideways or stern-first by towline force and loses the ability to recover its heading. If the heel increases far enough, the tug may capsize.

Mechanism

  1. The towline lead moves well off the tug's centerline.
  2. Transverse load overcomes the tug's ability to align with the tow.
  3. The tug heels rapidly as the towline continues to load the hull sideways.
  4. If the tow is not released or the tug cannot regain position, the casualty can escalate to downflooding and capsize.

Distinction from capsize girding

  • Girding is the hazardous towing condition itself.
  • Capsize girding is the accident outcome when that condition leads to loss of the tug.

Common contributors

  • Excessive speed during towage
  • Poor towline geometry
  • No bridle or gob rope where one is needed
  • Delayed or ineffective emergency release
  • Inadequate briefing between tug and pilot

Accidents linked to this concept are grouped by vessel type.