Overview
ISO 16548:2012 - Ships and marine technology - Ship design - General guidance on emergency towing procedures - provides guidance for cargo and passenger ships on planning and conducting emergency towing in accordance with SOLAS Regulation II‑1/3‑4. The standard supports creation of ship‑specific emergency towing procedures and complements IMO guidance (IMO MSC.1/Circ.1255:2008). It is intended to improve marine safety and emergency response when a vessel requires towing after collision, grounding, machinery failure or other distress.
Key topics and requirements
- Scope and applicability: Guidance applies to cargo ships and passenger ships subject to SOLAS II‑1/3‑4. Dates for compliance are specified for new and existing vessels (see SOLAS/ISO text).
- Towing arrangements and patterns: Illustrates typical towing patterns (e.g., patterns F1, F2, F3 for bow towing and A1, A2, A3 for stern towing) and recommends towing from the bow where practicable.
- Decision matrix: Provides a decision matrix to choose towing patterns based on ship status, position, weather, drift, propulsion/power availability and time to tow.
- Emergency towing system (ETS) and equipment: Defines ETS components (chafing chain, towing wire, chain stopper, fairlead, pick‑up gear), towing line, heaving rope and messenger rope, and limits on safe working loads.
- Procedures for connecting towing lines: Covers methods both when on‑deck power is available and when it is not; includes guidance on preparing light towing gear and manual connection techniques.
- Master’s response and communications: Specifies notifications (flag state, coastal state, owners/authorities), completion of ship status forms (Annex E tables), and transfer of ship‑specific data to the towing vessel.
- Safety considerations and preparations: Emphasizes crew safety (lifejackets, evacuation when lines are tensioned), maintenance of watertight integrity, securing cargo, stability checks, and where copies of the procedure should be kept (bridge, forecastle, ship’s office/cargo control room).
Practical applications and users
ISO 16548:2012 is used by:
- Shipowners and operators to prepare and document ship‑specific emergency towing procedures.
- Ship masters and crew for operational decision‑making and onboard drills.
- Ship designers and naval architects when specifying emergency towing arrangements during design or retrofitting.
- Port authorities, towing operators and salvage teams to coordinate safe tow connections and shared procedures.
- Classification societies and regulators for compliance checks against SOLAS requirements.
Practical benefits include clearer emergency roles, faster and safer towing operations, and reduced risk of structural damage by observing SWL limits and towing pattern guidance.
Related standards and guidance
- SOLAS Regulation II‑1/3‑4 - Emergency towing arrangements and procedures
- IMO MSC.1/Circ.1255:2008 - Guidelines for preparing emergency towing procedures
- IMO information papers referenced in the standard (e.g., IMO DE52/INF.2)