Cargo Measurement Tank quantities are measured by noting the level of the fluid in the tank and then referring to the tank calibration tables and noting down the quantity specified against that level. Thus we take the sounding of a tank water and fuel on all type of ships and – then follow the above practice. Note that prior to referring to the tables the tank level has to be corrected for error due to trim and list. These corrections are generally given in the tank calibration tables. The method though fine by all are turned upside down on a tanker. A tanker loads oil and it is not feasible to take a sounding every now and then – besides it is very messy. On tankers therefore instead of sounding the reverse is measured that is the vacant level to reach the top of the tank or the – – ullage. Thus ullage tables are nothing but the sounding table reversed. Note the following: The maximum sounding of a tank is 24.35m the maximum ullage is also 24.35m. When the sounding is 10m the ullage be 24.35 10 = 14.35m – Thus when a tank is filling up the sounding increases, whereas the ullage reduces.
Cargo Measurement Tank quantities are measured by noting the level of the fluid in the tank and then referring to the tank calibration tables and noting down the quantity specified against that level. Thus we take the sounding of a tank – water and fuel on all type of ships and then follow the above practice. Note that prior to referring to the tables the tank level has to be corrected for error due to trim and list. These corrections are generally given in the tank calibration tables. The method though fine by all are turned upside down on a tanker. A tanker loads oil and it is not feasible to take a sounding every now and then – besides it is very messy. On tankers therefore instead of sounding the reverse is measured – that is the vacant level to reach the top of the tank – or the ullage. Thus ullage tables are nothing but the sounding table reversed. Note the following: The maximum sounding of a tank is 24.35m the maximum ullage is also 24.35m. When the sounding is 10m the ullage be 24.35 – 10 = 14.35m Thus when a tank is filling up the sounding increases, whereas the ullage reduces.
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