API MPMS 12.1.1 3rd Edition, April 2012
API Manual of Petroleum Measurement Standards Chapter 12.1.1 EI Hydrocarbon Management HM 1 Part 1 Calculation of Static Petroleum Quantities—Upright Cylindrical Tanks and Marine Vessels
Includes all amendments and changes through Errata , May 2015
Additional Comments: H1201013
Published By:American Petroleum Institute (API)
This standard is intended to guide the user through the steps necessary to calculate static liquid quantities, at atmospheric conditions, in upright, cylindrical tanks and marine tank vessels. The standard defines terms employed in the calculation of static petroleum quantities.
The standard also specifies equations that allow the values of some correction factors to be computed. Fundamental to this process is the understanding that in order for different parties to be able to reconcile volumes, they have to start with the same basic information (tank capacity table, levels, temperatures, and so forth) regardless of whether the information is gathered automatically or manually.
This standard does not address the calculation of clingage, non-liquid material, small quantities (such as onboard quantities, quantities remaining on board, and wedge formula, where material is not touching all bulkheads on marine vessels), and vapor space calculations.