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Oil Tankers Tank Dip

For measurment purposes.

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Posted:Feb 5, 2013 1:26:28 PM GMT
Oil measurement
Normally, the amount of oil in a particular tank is calculated by measuring the ullage (the vertical distance between the deck and the top of the oil) by means of a graduated steel tape. Tables relative to each tank convert this distance(taking into account the temperature and SG of the oil) into tonnage. Before discharging a cargo, water-finding paste would be applied to a dip to measure the depth any water (indicated by a change of colour) that might be at the bottom of the tank. A dip (rather than ullage)of the tank would often be taken when almost all of the oil had been discharged to see how much remained to pump out.
richard watkinson grundisburgh, suffolk

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