Admit ballast water only to those tanks that aredesignated for ballasting. Be sure the tanks are empty offuel oil before you add ballast. After you have usedwater ballast in any tank, remove as much water aspossible before you fill it with fuel oil. Use the lowerlevel suction lines for that purpose.If your ship suffers collision or battle damage, thedamage control aspects of the your job may suddenlybecome vital. To make stability calculations, damagecontrol central must have accurate information on thedistribution of all liquids carried on board. To maintainor improve stability, they may order the immediatetransfer of fuel oil, feedwater, or other liquids. If you arethe oil king during such an emergency, you will not havetime to learn your job or to catch up on details you mayhave forgotten or overlooked. You must ALWAYSknow how much liquid is in all tanks and exactly howthe fuel oil or feedwater transfer systems must be linedup to shift liquids from tank to tank.6-11
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