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Early assessment of ships hull damage - disaster & countermeasures

Ships of the general bulk carrier form have experienced a relatively high disaster during the late 1980s and early 1990s giving rise to concern as to their design and construction. Throughout the 1990s bulk carrier safety has received considerable attention in the work of IMO, the classification societies and elsewhere.

Based on experience of accidents with lesser consequences it was concluded that the casualties occurred through local structural failure leading to loss of watertight integrity of the side shell followed by progressive flooding through damaged bulkheads. The flooding resulting either in excessive hull bending stresses or excessive trim, and loss of the ship.
Safer Bulk carrier
Fig:Making bulk carriers safer

Much of this work has concentrated on the structural hull details, stresses experienced as the result of loading and discharging cargoes, damage to structure and protective coatings arising from discharging cargoes, poor maintenance and subsequent inadequate inspection of the ship structure.



The outcome of this work has been the introduction of a new Chapter XII of SOLAS covering bulk carrier ship safety and enhanced survey procedures for bulk carriers. The chapter highlighting strengthening of hatch covers in the forward part of the ship ,structural requirement, adequacy of bow heights provide additional security against cargo damage, damage stability guideline and other requirements.


A Bulk carrier encountering head seas

Fig: Bulk carrier encountering rough sea conditions

Guidance on early assessment of hull damage and possible abandonment

There have been cases in the past where ships carrying bulk cargoes have been lost due to a loss in hull integrity. This, combined with the lack of prompt action, has resulted in lives being lost. Early assessment of the situation is therefore imperative, combined with alerting a maritime rescue coordination centre, alerting all personnel onboard and making preparations for evacuation. This is of particular importance for single skin bulk carriers which may not be capable of withstanding flooding of any cargo hold.

Heavy cargoes such as iron ore or heavy break bulk cargoes, such as steel, make a ship particularly vulnerable. This is due to the relatively small volume of cargo compared to the large volume of unoccupied space that provides the potential for large volumes of water to destroy the ship’s buoyancy, stability or structural integrity.


Assessment

Where flooding occurs, or is likely to occur, the master must rapidly assess the damage by being alert to water ingress and its consequences. Such an assessment may be carried out by the following:

Unusual Motion or Attitude:

If a ship takes on an unusual trim or heel, or if her motions become changed, breach of the hull envelope should be suspected immediately. Signs may include:
Methods of Detection



Early Readiness for Evacuation

In the event of identifying, or even suspecting, that the ship may have sustained damage, the ship’s personnel should immediately be called to their emergency stations. A HIGH PRIORITY SHOULD BE PLACED ON PREPARING EQUIPMENT FOR EVACUATION. Abandonment should, however, only be invoked on the spoken orders of the Master following assessment of the risk.

Contact with a Maritime Rescue Co-ordination Centre (MRCC) and the management office should be made early if the Master has any suspicion that the ship is damaged. An URGENCY (Pan-Pan) signal is justified and this should be upgraded to DISTRESS (Mayday) if the ship is confirmed as damaged.


Training

Masters should place a strong emphasis on evacuation training so that donning of protective suits and lifejackets, launching of survival craft, and operation of EPIRBs and SARTs is a familiar process to all ship’s personnel. Also included should be shutdown procedures for main and auxiliary machinery, which can, if left running, hinder launching of survival craft.


Investigation

Masters may wish to investigate any suspected water ingress more closely but preparations for evacuating the ship should be made WITHOUT DELAY and concurrent with any investigation. Remote methods of observation are preferable to sending personnel onto decks, particularly in bad weather and / or at night. Deck floodlights should be used if necessary to try and identify abnormalities. Detrimental effects on watch keeper’s night vision are of secondary importance in such circumstances.

When a loss of hull integrity is known or suspected, personnel should not be sent onto decks that are being regularly submerged or deeply awash. In such circumstances the ship should be regarded as in imminent danger and priority should be given to preparations for evacuation.

Where water ingress alarms are fitted, full instructions must be posted by the alarm panel which will normally be located on the bridge. All officers are to be made aware of the alarm settings, correct operation and testing of this equipment.


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Shipboard hazards & bulk carriers safety guideline

Health hazards for personnel working in a dusty condition onboard


Top articles

  1. Indication of unusual motion or attitude of bulk carriers and risk management / evacuation

  2. Deterioration of ships structure and consequences of forward flooding

  3. Handling water ingress problems in bulk carrier, investigation and countermeasures

  4. Survival and safety procedure for bulk carriers

  5. How to avoid damage during cargo operation


  6. How to arrange repair of damage during cargo loading/unloading


  7. Bulk carrier corrosion rates and preventive measures

  8. Shipboard hazards & bulk carriers safety guideline

  9. Health hazards for personnel working in a dusty condition onboard


  10. Regulation of pumping system of bulk carriers


  11. Ships Confined area safe practice


  12. Causes of structural damage and countermeasures

Our detail pages illustrated many safety aspects of Bulk carrier

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Operation of sea going bulk carriers involved numerous hazards . Careful planning and exercising due caution for all critical shipboard matters are important . This site is a quick reference to international shipping community with guidance and information on the loading and discharging of modern bulk carriers so as to remain within the limitations as specified by the classification society.
It is vital to reduce the likelihood of over-stressing the ship's structure and also complying with all essential safety measures for a safe passage at sea. Our detail pages contain various bulk carrier related topics that might be useful for people working on board and those who working ashore in the terminal. For any remarks please
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