API 2564 : 3ED 2001

15.0 Introduction
15.1 Scope and field of application
15.2 References
15.3 The International System of units (SI)
      15.3.1 General
      15.3.2 SI Base units
      15.3.3 SI Supplementary units
      15.3.4 Derived units
      15.3.5 Other Allowable Units
      15.3.6 Decimal Multiples and Submultiples of SI units
      15.3.7 Use of letter symbols
15.4 Use of conversion tables in section 15.5
      15.4.1 Categories
      15.4.2 Corrections
      15.4.3 Preferred units
      15.4.4 Equivalent units
      15.4.5 Notation
      15.4.6 Significant Digits
      15.4.7 Horsepower, Calorie and BTU
      15.4.8 Reference Conditions
      15.4.9 Amount of substance
      15.4.10 Density
      15.4.11 Attachments to units
      15.4.12 Exceptions
      15.4.13 Nomenclature
15.5 Tables of recommended SI units and conversion
      factors
15.6 Examples
15.7 Acknowledgments
Appendix A - Metric conversion of liquids
Appendix B - Metric conversion of natural gas
Appendix C - Bibliography
Appendix D - Organization names, abbreviations and functions

Defines units for quantities involved in petroleum industry measurements and indicates factors for conversion of quantities expressed in customary units to the API preferred metric units.