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ASTM-D7157:2009 Edition(Redline)

ASTM-D7157:2009 Edition(Redline)

$26.65

D7157-09 Standard Test Method for Determination of Intrinsic Stability of Asphaltene-Containing Residues, Heavy Fuel Oils, and Crude Oils (n-Heptane Phase Separation; Optical Detection) (Redline)

Published By Publication Date Number of Pages
ASTM 2009 9
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Significance and Use

This test method describes a sensitive method for estimating the intrinsic stability of an oil. The intrinsic stability is expressed as S -value. An oil with a low S -value is likely to undergo flocculation of asphaltenes when stressed (for example, extended heated storage) or blended with a range of other oils. Two oils each with a high S -value are likely to maintain asphaltenes in a peptized state and not lead to asphaltene flocculation when blended together.

This test method can be used by petroleum refiners to control and optimize the refinery processes and by blenders and marketers to assess the intrinsic stability of blended asphaltene-containing heavy fuel oils.

1. Scope

1.1 This test method covers a procedure for quantifying the intrinsic stability of the asphaltenes in an oil by an automatic instrument using an optical device.

1.2 This test method is applicable to residual products from thermal and hydrocracking processes, to products typical of Specifications D 396 Grades No. 5L, 5H, and 6, and D 2880 Grades No. 3-GT and 4-GT, and to crude oils, providing these products contain 0.5 mass% or greater concentration of asphaltenes (see Test Method D 6560).

1.3 This test method quantifies asphaltene stability in terms of state of peptization of the asphaltenes ( S -value), intrinsic stability of the oily medium ( So ) and the solvency requirements of the peptized asphaltenes ( Sa ).

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D396 Specification for Fuel Oils D2880 Specification for Gas Turbine Fuel Oils D4057 Practice for Manual Sampling of Petroleum and Petroleum Products D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products D4870 Test Method for Determination of Total Sediment in Residual Fuels D6560 Test Method for Determination of Asphaltenes (Heptane Insolubles) in Crude Petroleum and Petroleum Products D6792 Practice for Quality System in Petroleum Products and Lubricants Testing Laboratories

Keywords

asphaltenes; compatibility; crude oil; heavy fuels oils; intrinsic stability; S-value; phase separation; residual oil; Asphaltenes; Crude oil; Heavy fuel oils; n -Heptane; Intrinsic stability; Optical detection method; Phase separation; Residual oil;

ICS Code

ICS Number Code 75.040 (Crude petroleum)

DOI: 10.1520/D7157-09 ASTM International is a member of CrossRef.

Citing ASTM Standards

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