During a SIRE inspection of a vessels a following observation was noted:
Vessel equipped with damage stability feature in the loading computer. In the last two loaded conditions, the damage stability did not comply with IMO rules in three scenarios. There was not a formal procedure onboard to notify this to the bridge officers.
It was noted that the vessel had retained a considerable ballast on board after loading which caused vessel stability condition to be non-compliant with the damage stability criterion as computed by the approved damaged stability cases available in the loading computer.
Further, the additional ballast causes extra load on the main engine causing an unnecessary increase in fuel consumption. The additional ballast also increases underwater water interaction e.g. UKC, drag and sluggish steerage in river ports like Galati, Mongla, Haldia, Coari and Manaus etc.)
All vessels with a class approved loadicator program suitable of carrying out damage stability calculation are to check if the departure stability conditions are satisfying all pre-defined damage stability cases as per the approved damage stability manual. This means that all damage cases must be ok/good in all departure conditions. Should departure condition fail to meet any of the damage case(s) despite ballast adjustment then this condition must be notified to the bridge and recorded. This should be formally recorded in the cargo plan meeting/briefing for been having discussed.
As per new regulations, IMO requires that all tankers undergoing renewal surveys after 1 July 2016 should have an onboard stability instrument for determining compliance with Intact & Damage Stability requirements, all vessels are to verify that their arrival & departure conditions are meeting the minimum requirements of the damage stability i.e. all damage cases result must be good/ok in the current condition.
If the damage stability assessment gives any non-compliances same to be corrected by adjusting ballast/cargo/fuel as required. This should be formally recorded in the cargo plan meeting/briefing for been having discussed. Kindly ensure a copy of departure stability condition must be readily available, for an emergency situation, to be used with Emergency Technical Assessment Service (ETAS /RRDA/ERS).
All vessels not having the damage stability calculator, should thoroughly go through the Approved Damage Stability Booklet & ensure that the worst case damage condition is identified & made available on the bridge at all times for reference of the navigators.
21 Dec '17, 09:43