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API MPMS Chapter 12.1 Part 2 API Manual of Petroleum Measurement Standards Chapter 12 - Calculation of Petroleum Quantities, Section 1 - Calculation of Static Petroleum Quantities, Part 2 - Calculation Procedures for Tank Cars, Second Edition
Handbook / Manual / Guide by American Petroleum Institute, 02/01/2018
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SECOND EDITION, FEBRUARY 2018
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Page
Scope 1
Normative References 1
Terms, Definitions, Acronyms, and Abbreviations 1
General 1
Acronyms and Abbreviations 6
Required Data Acquisition 7
General 7
Tank Car Data 7
Product Data 8
Actual Loaded Quantity Calculations 11
General 11
General Purpose Cars 11
Pressure Cars 11
Vapor Space Heel 12
Overload check 12
Rounding 12
Data Level 12
Rounding of Numbers 13
Annex A (normative) Loading Target Quantity Calculations 14
Annex B (informative) Calculation of Tank Car Shell Expansion/Contraction with Temperature 19
Annex C (informative) Calculation of Tank Car Shell Expansion with Pressure 21
Annex D (informative) Calculation of Magnetic Gauge Offsets 22
Annex E (informative) Tank Car Reconciliation 28
Annex F (informative) Calculation Examples 30
Bibliography 53
Figures
Magnetic Float Gauge 22
Derivation of a Spherical Volume Segment or Bowl 26
Butene Static Scale—BOL Difference 28
Actual Tare Minus Stenciled Weight 29
Tables
1 Significant Digits 13
B.1 Shell Temperature (°F) Tank Car Volume Correction Factors 20
C.1 Pressure (psig) Expansion Table for a Typical (D = 120 in., t = 11/16-in. mild steel) Pressure Car . . . 21
Temperature Offset for a Reference Relative Density of 0.50000 26
Temperature Offset for a Reference Relative Density of 1.0000 26
Outage Liquid Capacity Table—Loading Target Calculation—Volume Limitation 30
Outage Liquid Capacity Table—Actual Loaded Calculation 31
Outage Liquid Capacity Table—Loading Target Calculation—Weight Limitation 33
Outage Liquid Capacity Table with Nozzle Height Included—Loading Target Calculation
—Volume Limitation 34
v
Example 5: Outage Liquid Capacity Table with Nozzle Height Included—Actual Loaded
Page
Calculation 36
Outage Vapor Capacity Table—Loading Target Calculation—Volume Limitation 37
Outage Vapor Capacity Table—Loading Target Calculation—Understated Loading Temperature . . 38
Outage Vapor Capacity Table—Actual Loaded Calculation 39
Outage Vapor Capacity Table—Actual Loaded Calculation—Overstated Target Loading Temperature Results in Overloading by Volume 41
Outage Vapor Capacity Table—Pressure Car Target Loading Calculation—Summer Loading 42
Outage Vapor Capacity Table—Pressure Car Target Loading Calculation—Winter Loading 43
Outage Vapor Capacity Table—Pressure Car Target Loading Calculation—Summer Loading 45
Innage Liquid Capacity Table—Loading Target Calculation—Volume Limitation 46
Tank Car Capacity Table 48
Tank Car Capacity Table 49
Tank Car Capacity Table 50
Tank Car Capacity Table 51
Tank Car Capacity Table 52
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This chapter of the Manual of Petroleum Measurement Standards describes the standardized method for calculating target loading quantities and actual loaded quantities of liquids in tank cars. Also addressed within this chapter is an explanation of the factors required for the calculations.
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Chapter 12—Calculation of Petroleum Quantities Section 1—Calculation of Static Petroleum Quantities Part 2—Calculation Procedures for Tank Cars
This chapter is 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 use. The cars are assumed to be on level ground.
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 (including any addenda or errata, or both).
API Manual of Petroleum Measurement Standards (MPMS) Chapter 1, Vocabulary
API Manual of Petroleum Measurement Standards (MPMS) Chapter 3.2, Tank Car Measurement
API Manual of Petroleum Measurement Standards (MPMS) Chapter 10, Sediment and Water
API Manual of Petroleum Measurement Standards (MPMS) Chapter 11.2.4, Temperature Correction for the Volume of NGL and LPG, Tables 23E, 24E, 53E, 54E, 59E, and 60E
API Manual of Petroleum Measurement Standards (MPMS) Chapter 11.2.5, A Simplified Vapor Pressure Correlation for Commercial NGLs
API Manual of Petroleum Measurement Standards (MPMS) Chapter 12.2, Calculation of Petroleum Quantities Using Dynamic Measurement Methods and Volumetric Correction Factors
ASTM D1555, Standard Test Method for Calculation of Volume and Weight of Industrial Aromatic Hydrocarbons and Cyclohexane
For 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.
3.1.1
capacity table adjustment factor
CTAF
Correction applied to capacity table volumes.
3.1.2
closed loading or closed unloading
The manway remains closed or covered during loading or unloading.
1