Johan Gahnstrom

14/09/2022

Site visit at HallandsHamnar AB together with friends at SSPA to assist with mooring and layout of storm mooring.

31/03/2022

How to avoid that keep recurring in the industry. According to IACS UR A1:The equipment is intended for temporary mooring of a vessel within a harbour or a sheltered area when the vessel is awaiting berth, tide etc.

The equipment is therefore not designed to hold a ship off fully exposed coasts in rough weather or stop a ship that is moving or drifting. In this condition the loads on the anchoring equipment increase to such a degree that its components may be damaged or lost owing to the high energy forces generated, particularly in large .

As an example, the windlass is designed to lift 3 lengths of chain. ie. 82.5m and the anchor. Anchoring in deeper water will therefore go outside of the design criteria.

Even if you anchor in a normal open outside a port the IACS design criteria for the equipment are:
• Current velocity: max. 1.5m/s
• Wind velocity: max. 11m/s
• Significant wave height: max. 2m

As can be seen in the picture here, catastrophic failure of equipment happens that can be avoided.
So, ensure that the deck officers know the maximum ‘environmental envelope’ the equipment can hold, and make sure that this is reflected in the shipboard anchoring procedures. It is suggested that such key information should be available to the bridge team clearly posted on the bridge as best practice.

Figures from the Anchoring Guidelines: A Risk-Based Approach ©INTERTANKO 2019 that was fortunate enough to be the editor of.

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