API MPMS 11.5.1:2009 pdf download

API MPMS 11.5.1:2009 pdf download.Manual of Petroleum Measurement Standards Chapter 11- -Physical Properties Data Section 5- -Density/WeightNolume Intraconversion Part 1- Conversions of API Gravity at 60 °F.
5 Rounding
5.1 Data Level
The exact unit relationships displayed in Annex A and used in Annex B contain varying significant figures. For the purposes of this standard the intermediate constants derived in Annex B from these exact relationships are rounded to 10 significant figures.
API MPMS Ch. 12 governs all rounding. Absent specific direction from API MPMS Ch. 12, the implementation procedures detailed in Section 4 specify the rounding for each intraconversion.
As the current version of API MPMS Ch. 12 states, rounding during the use of the intraconversion factors is influenced by the source of the data. For example, if a container’s capacity tables are in whole gallons then all subsequent gallons values should be recorded accordingly. In those cases where there are no other limiting factors (i.e. direction by API MPMS Ch. 12), the operator should be guided by Table 1, which is intended for application to bulk liquid quantities. Other considerations may apply for smaller quantities; e.g. while Table I recommends the calculated weight of a bulk cargo (say a barge of asphalt) be rounded to whole pounds or kilograms, a user may wish to calculate the weight of a barrel of product to two or three decimal places. The significant digits in Table I provide consistency within this standard and may differ slightly from the current API MPMS Ch. 12.
5.2 Rounding of Numbers
Chain calculations should be performed without rounding or truncation. When a calculation result is to be rounded to a specific number of decimals, it shall always be rounded off in one step to the number of figures to be recorded and not rounded in two or more successive steps. When 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. When figure to the right of the last place to be retained is 5 to 9, the figure in the last place should be increased by 1.
The result is then divided by the liquid’s VCF at 59 °F (crude oils, generalized products, and lubricants will use API MPMS Ch.11.1-2004; other products may use different tables) to obtain cubic metres at 15 °C.
The relationship between API gravity at 60 °F and the volume in cubic metres at 15。C occupied by 1 LT in air is accomplished by the reciprocal of Equation (B.6), usingf as calculated above. The result is then divided by the liquid’s VCF at 59 °F (crude oils, generalized products, and lubricants will use API MPMS Ch.11. 1-2004; other products may use different tables) to obtain cubic metres at 15 °C.
B.19 U.S. Gallons at 60 °F to Litres at 15 °C for API Gravity at 60 °F
Conversion of volume in U.S. gallons at 60 °F to litres at 15 °C is accomplished by dividing by the liquid’s VCF at 59 °F (crude oils, generalized products, and lubricants will use API MPMS Ch. 11.1-2004; other products may use different tables) to obtain U.S. gallons at 15 °C and then converting U.S. gallons to litres.