27.Angle of loll

ANGLE OF LOLL

-     An initially unstable ship heels to a certain angle and ends up in neutral stability. That angle   is called angle of loll

-     At angle of loll ., GM = 0 OR KG = KM

 CORRECTIVE ACTION

-      First check if  the vessel is listed or lolled

-      Always presume it is lolled for safety and work accordingly

-      Calculate the vol of all tanks check for any slack tanks if any for the reason listed

-      
        If the port and starboard listing moments are same then confirm its lolled

       -In a listed condition always try to lower the centre of gravity by discharging the high side       of the ballast first start filling low side of the tanks (prefer smaller tanks to minimise free         surface effect during filling ) (coz if you fill the other side of the tank, the listing moment         will be enough to capsize) gradually start filling the mid tank and then the port side tank

-       now the vessel should be upright , even if it is not ., try ballasting other tanks in the same       method

   WHERE DOES ANGLE OF LOLL OCCUR

        Occurs in timber carriers., - timber s on the deck absorb moisture and increases the cog

        Moreover, while sailing, consumption of fuel and water from the lower tanks also 
        increases the cog.

NOTE :- DURING LOLL – NEVER BALLAST THE HIGH SIDE OF THE TANK , BECAUSE, THE SHIPS LISTING MOMENT TO THE OTHER SIDE IS ENOUGH FOR IT TO CAPSIZE