In many cases the number of decimal places that are to be used is influenced by the source of the data itself. For example, if a vessel's capacity tables are calibrated to the nearest whole barrel, then all subsequent barrel values should be recorded accordingly. However, in those cases where there are no other limiting factors, the operator should be guided by the below table.
Rounding of numbers : when a number is to be rounded to a specific number of decimals, it shall always be done in one step to the number of figures that are to be recorded and shall not be rounded in two or more steps of successive rounding. When the figure to the right of last place to be retained is 5 or greater, the figure in the last place to be retained should be increased by 1. If the figure to the right of the last place to be retained is less than 5, the figure in the last place retained should be unchanged. 8.4 Observed Data Observed data is also referred to as input data, direct data or primary data. The following input or observed data must be gathered as a first step in the calculation process. This input or observed data must be gathered concurrently. In other words, the level gauge, water cut, temperature, etc., should all be taken at the same time for inclusion on the same field report.
8.3 Decimal Places and Rounding 12 In order for different individuals to arrive independently at the same final number it is necessary to have conformity in the number of decimal places used for input data.
Units
N ° of decimals
Units
N ° of decimals
Liters
none
one
API Gravity at 60 ° F
Gallons
two
VCF (CTL)
four or five
Barrels
two
Density lbs/gal
three
Cubic Meters
three
Density kg/l
four or five
Pounds
none
Relative Density
four or five
Kilograms
none
S&W %
three
Short Tons
three
CSW
five
Metric Tons
three
one
Temperature ° F Temperature ° C
Long Tons
three
one
none
TSh ° C / ° F
CTSh
five
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