Manual of Petroleum Measurement Standards Chapter 11—Physical Properties

Data

Section 5—Density/Weight/Volume Intraconversion Part 1—Conversions of API Gravity at 60 °F Adjunct to: ASTM D1250-08 and IP 200/08

FIRST EDITION, MARCH 2009

ERRATA, SEPTEMBER 2011 (UPDATED, SEPTEMBER 2013)

REAFFIRMED, MARCH 2015

Manual of Petroleum Measurement Standards Chapter 11—Physical Properties

Data

Section 5—Density/Weight/Volume Intraconversion Part 1—Conversions of API Gravity at 60 °F Adjunct to: ASTM D1250-08 and IP 200/08

Measurement Coordination

FIRST EDITION, MARCH 2009

ERRATA, SEPTEMBER 2011 (UPDATED, SEPTEMBER 2013)

REAFFIRMED, MARCH 2015

Special Notes

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Copyright © 2009 American Petroleum Institute

Foreword

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Contents

Page

Implementation Guidelines 1

1. Scope 1

2. References 1

3. Definitions and Abbreviations 2

   1. Definitions 2

   2. Abbreviations 3

4. Implementation Procedures 4

   1. Relative Density (60/60 °F) Equivalent to API Gravity at 60 °F 4

   2. Absolute Density at 60 °F Equivalent to API Gravity at 60 °F 4

   3. Absolute Density at 15 °C Equivalent to API Gravity at 60 °F 5

   4. Pounds per U.S. Gallon at 60 °F Equivalent to API Gravity at 60 °F 5

   5. U.S. Gallons per Pound at 60 °F Equivalent to API Gravity at 60 °F 6

   6. Short Tons per 1000 U.S. Gallon at 60 °F Equivalent to API Gravity at 60 °F 7

   7. U.S. Gallons per Short Ton at 60 °F Equivalent to API Gravity at 60 °F 7

   8. Short Tons per Barrel at 60 °F Equivalent to API Gravity at 60 °F 8

   9. Barrels per Short Ton at 60 °F Equivalent to API Gravity at 60 °F 8

   10. Long Tons per 1000 U.S. Gallons at 60 °F Equivalent to API Gravity at 60 °F 9

   11. U.S. Gallons per Long Ton at 60 °F Equivalent to API Gravity at 60 °F 10

   12. Long Tons per Barrel at 60 °F Equivalent to API Gravity at 60 °F 10

   13. Barrels per Long Ton at 60 °F Equivalent to API Gravity at 60 °F 11

   14. Metric Tons per 1000 U.S. Gallons at 60 °F Equivalent to API Gravity at 60 °F 12

   15. Metric Tons per Barrel at 60 °F Equivalent to API Gravity at 60 °F 12

   16. Barrels per Metric Ton at 60 °F Equivalent to API Gravity at 60 °F 13

   17. Cubic Metres per Short Ton at 15 °C Equivalent to API Gravity at 60 °F 14

   18. Cubic Metres per Long Ton at 15 °C Equivalent to API Gravity at 60 °F 14

   19. U.S. Gallons at 60 °F to Litres at 15 °C Dependent on API Gravity at 60 °F 15

   20. Barrels at 60 °F to Litres at 15 °C Dependent on API Gravity at 60 °F 15

5. Rounding 16

   1. Data Level 16

   2. Rounding of Numbers 16

Annex A Physical Constants 18

Annex B Derivation of Equations 19

Annex C Partial Tables. 25

Annex D Interrelation of Units of Measurement 26

Annex E Temperature Conversions 27

Table

1 Significant Digits for Bulk Quantities 17

v

Introduction

API MPMS Ch. 11.5.1, API MPMS Ch. 11.5.2, and API MPMS Ch. 11.5.3 are intended to replace API MPMS Ch. 11.1-1980 Volumes XI/XII (ASTM D1250-80, IP 200/80). This standard gives the following equivalents for any value of API gravity at 60 °F:

• relative density at 60 °F (old Table 3);

  
  

• absolute density at 60 °F;

  
  

• absolute density at 15 °C (old Table 3);

  
  

• pounds per U.S. gallon at 60 °F in vacuo and in air (old Table 8);

  
  

• U.S. gallons per pound at 60 °F in vacuo and in air (old Table 8);

  
  

• short tons per 1000 U.S. gallons at 60 °F in vacuo and in air (old Table 9);

  
  

• U.S. gallons per short ton at 60 °F in vacuo and in air (old Table 10);

  
  

• short tons per barrel at 60 °F in vacuo and in air (old Table 9);

  
  

• barrels per short ton at 60 °F in vacuo and in air (old Table 10);

  
  

• long tons per 1000 U.S. gallons at 60 °F in vacuo and in air (old Table 11);

  
  

• U.S. gallons per long ton at 60 °F in vacuo and in air (old Table 12);

  
  

• long tons per barrel at 60 °F in vacuo and in air (old Table 11);

  
  

• barrels per long ton at 60 °F in vacuo and in air (old Table 12);

  
  

• metric tons per 1000 U.S. gallons at 60 °F in vacuo and in air (old Table 13);

  
  

• metric tons per barrel at 60 °F in vacuo and in air (old Table 13);

  
  

• barrels per metric ton at 60 °F in vacuo and in air;

  
  

• cubic metres per short ton at 15 °C in vacuo and in air (old Table 14);

  
  

• cubic metres per long ton at 15 °C in vacuo and in air (old Table 14).

  
  

  While not related to API gravity, the following are included for user convenience:

  
  

• U.S. gallons at 60 °F to litres at 15 °C (old Table 4);

  
  

• barrels at 60 °F to litres at 15 °C (old Table 4);

This standard is intended for application to bulk liquid quantities.

This standard provides implementation procedures for conversion of API gravity at 60 °F to equivalent densities in both in vacuo and in air values. A derivation of the in air equation is presented in Section B.4. In air values reflect the buoyancy effect of air if a substance were to be weighed in the air, and thus are slightly less than in vacuo values by approximately 0.1 % to 0.2 %. Although in air implementation procedures are presented in this standard in recognition

vii

of certain common industry practices, in vacuo values are recommended because they more accurately represent the amount of material present.

Furthermore, as there is no known technical reason for the continued use of API gravity in the oil industry, absolute density is recommended instead (see API MPMS Ch. 11.5.3). This standard is presented, however, for the convenience of certain current common industry practices.

viii

Chapter 11—Physical Properties Data Section 5—Density/Weight/Volume Intraconversion

Part 1—Conversions of API Gravity at 60 °F

Implementation Guidelines

This revised standard is effective upon the date of publication and supersedes the applicable parts of API MPMS Ch. 11.1-1980, Volumes XI/XII. However, due to the nature of the changes in this revised standard, it is recognized that guidance concerning an implementation period may be needed in order to avoid disruptions within the industry and ensure proper application. As a result, it is recommended that this revised standard be utilized on all new applications no later than TWO YEARS after the publication date. An application, for this purpose, is defined as the point where the calculation is applied.

Once the revised standard is implemented in a particular application, the previous standard will no longer be used in that application.

However, the use of API standards remains voluntary and the decision on when to utilize a standard is an issue that is subject to the negotiations between the parties involved in the transaction.

1. Scope

   These intraconversion tables are applicable to all crude oils, petroleum products, and petrochemicals.

   
   

2. References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

API MPMS Chapter 11.1-2004, Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, and Lubricating Oils

API MPMS Chapter 11.4.1-2003, Density of Water and Water VCFs for Volumetric Meter Proving

API MPMS Chapter 15-2001, Guideline for the Use of the International System of Units (SI) in the Petroleum and Allied Industries

ASTM D1250-1959 1, Report on the Development, Construction, and Preparation of the ASTM–IP Petroleum Measurement Tables

12th General Conference on Weights and Measures (1964)

NIST Handbook 44-2002 Edition 2, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

NIST Handbook 44-2007 Edition, Appendix C

NIST Handbook 105-1 (Revised 1990), Specifications and Tolerances for Reference Standards and Field Standard Weights and Measures

1. ASTM International, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.org.

2. National Institute of Standards and Technology, 100 Bureau Drive, Stop 3460, Gaithersburg, Maryland 20899, www.nist.gov.

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