1、Manual of Petroleum StandardsChapter 12Calculation of Petroleum QuantitiesSection 1Calculation of Static Petroleum QuantitiesPart 2Calculation Procedures for Tank CarsSECOND EDITION, FEBRUARY 2018Special NotesAPI publications necessarily address problems of a general nature. With respect to particul
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15、dded to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.Suggested revisions are invited and should be submitt
16、ed to the Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative Refer
17、ences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms, Definitions, Acronyms, and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.1 General . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 Acronyms and Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . . . 64 Required Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . 74.2 Tank Car Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.3 Product Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Actual Loaded Quantity Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.1 General . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.2 General Purpose Cars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.3 Pressure Cars . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.4 Vapor Space Heel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . 125.5 Overload check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . 126.1 Data Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.2 Rounding of Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Annex A (normative) Loading Target Quantity Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Annex B (informative) Calculation of Tank Car Shell Expansion/Contraction with Te
27、mperature . . . . . . . . . . 19Annex C (informative) Calculation of Tank Car Shell Expansion with Pressure . . . . . . . . . . . . . . . . . . . . . . . . 21Annex D (informative) Calculation of Magnetic Gauge Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Anne
28、x E (informative) Tank Car Reconciliation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Annex F (informative) Calculation Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Bib
29、liography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53FiguresD.1 Magnetic Float Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . 22D.2 Derivation of a Spherical Volume Segment or Bowl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26E.1 Butene Static ScaleBOL Difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、 . . . . . . 28E.2 Actual Tare Minus Stenciled Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Tables1 Significant Digits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 . . . . . . . . . . . . . 13B.1 Shell Temperature (F) Tank Car Volume Correction Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20C.1 Pressure (psig) Expansion Table for a Typical (D = 120 in., t = 11/16-in. mild steel) Pressure Car . . . 21D.1 Temperature Offset for a Re
33、ference Relative Density of 0.50000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26D.2 Temperature Offset for a Reference Relative Density of 1.0000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26F.1 Outage Liquid Capacity TableLoading Target CalculationVolume Limitation
34、. . . . . . . . . . . . . . . . 30F.2 Outage Liquid Capacity TableActual Loaded Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31F.3 Outage Liquid Capacity TableLoading Target CalculationWeight Limitation . . . . . . . . . . . . . . . . 33F.4 Outage Liquid Capacity T
35、able with Nozzle Height IncludedLoading Target CalculationVolume Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34vContentsPageF.5 Example 5: Outage Liquid Capacity Table with Nozzle Height IncludedActual
36、 Loaded Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36F.6 Outage Vapor Capacity TableLoading Target CalculationVolume Limitation . . . . . . . . . . . . . . . . 37F.7 Outage Vapor Capa
37、city TableLoading Target CalculationUnderstated Loading Temperature . . 38F.8 Outage Vapor Capacity TableActual Loaded Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39F.9 Outage Vapor Capacity TableActual Loaded CalculationOverstated Target Loading Temperature Resul
38、ts in Overloading by Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41F.10 Outage Vapor Capacity TablePressure Car Target Loading CalculationSummer Loading . . . . . 42F.11 Outage Vapor Capacity TablePressure Car Target Loading Calc
39、ulationWinter Loading . . . . . . . 43F.12 Outage Vapor Capacity TablePressure Car Target Loading CalculationSummer Loading . . . . . 45F.13 Innage Liquid Capacity TableLoading Target CalculationVolume Limitation . . . . . . . . . . . . . . . . 46F.14 Tank Car Capacity Table . . . . . . . . . . . .
40、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48F.15 Tank Car Capacity Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49F.16 Tank Car Capacity Table . . . . .
41、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50F.17 Tank Car Capacity Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51F.18 Tank Car Capacity Ta
42、ble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52viIntroductionThis chapter of the Manual of Petroleum Measurement Standards describes the standardized method for calculating target loading quantities and actual loade
43、d quantities of liquids in tank cars. Also addressed within this chapter is an explanation of the factors required for the calculations.vi1Chapter 12Calculation of Petroleum QuantitiesSection 1Calculation of Static Petroleum QuantitiesPart 2Calculation Procedures for Tank Cars1 Scope This chapter is
44、 applicable to all crude oils, petroleum products, and petrochemicals (including LPGs and other liquefied gases) transported by rail tank car. It does not cover any products loaded or measured as solids. It defines the terms required to understand the calculations and provides instructions for their
45、 use. The cars are assumed to be on level ground.2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only edition cited applies. For undated references, the latest edition of the referenced document applies (includin
46、g any addenda or errata, or both).API Manual of Petroleum Measurement Standards (MPMS) Chapter 1, VocabularyAPI Manual of Petroleum Measurement Standards (MPMS) Chapter 3.2, Tank Car MeasurementAPI Manual of Petroleum Measurement Standards (MPMS) Chapter 10, Sediment and WaterAPI Manual of Petroleum
47、 Measurement Standards (MPMS) Chapter 11.2.4, Temperature Correction for the Volume of NGL and LPG, Tables 23E, 24E, 53E, 54E, 59E, and 60EAPI Manual of Petroleum Measurement Standards (MPMS) Chapter 11.2.5, A Simplified Vapor Pressure Correlation for Commercial NGLsAPI Manual of Petroleum Measureme
48、nt Standards (MPMS) Chapter 12.2, Calculation of Petroleum Quantities Using Dynamic Measurement Methods and Volumetric Correction FactorsASTM D1555, Standard Test Method for Calculation of Volume and Weight of Industrial Aromatic Hydrocarbons and Cyclohexane3 Terms, Definitions, Acronyms, and Abbrev
49、iationsFor the purposes of this document, the following terms and definitions apply. Terms of more general use (i.e. API Gravity, Density, etc.) may be found in API MPMS Chapter 1.3.1 General3.1.1 capacity table adjustment factor CTAFCorrection applied to capacity table volumes. 3.1.2 closed loading or closed unloadingThe manway remains closed or covered during loading or unloading. 2API MPMS CHAPTER 12.1.2CALCULATION OF PETROLEUM QUANTITIES3.1.3 compartment carA car with two or more independent (no common walls) tanks, each with its own manway, referenc
