ASTM D287 for API gravity of crude petroleum and petroleum products
ASTM D287 standard test method for API gravity of crude petroleum and petroleum products(Hydrometer method)
1. Scope
1.1 This test method covers the determination by means of a glass hydrometer of the API gravity of crude petroleum and petroleum products normally handled as liquids and having a Reid vapor pressure (Test Method D323) of 26 psi (180 kPa) or less. Gravities are determined at 60°F (15.56°C), or converted to values at 60°F, by means of standard tables. These tables are not applicable to nonhydrocarbons or essentially pure hydrocarbons such as the aromatics.
NOTE 1 - The international version of this test method is described in Practice D1298.
1.2 Values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 8.3.
2. Referenced Documents
2.1 ASTM Standards:
D323 Test Method for Vapor Pressure of Petroleum Products (Reid Method)
D1250 Guide for Petroleum Measurement Tables
D1298 Practice for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method
E 1 Specification for ASTM Thermometers
E 100 Specification for ASTM Hydrometers
2.2 IP Standards:
Specifications for IP Standard Thermometers
IP Specifications for Petroleum Hydrometers
3. Terminology
3.1 Definitions:
3.1.1 API gravity - a special function of relative density (specific gravity) 60/60°F (15.56/15.56°C), represented by:
API gravity, deg = (141.5/sp gr 60/60°F) - 131.5
No statement of reference temperature is required, since 60°F is included in the definition.
