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ASTM D 189 Document Information:
Title
Standard Test Method for Conradson Carbon Residue of Petroleum Products
ASTM International
Publication Date:
Nov 1, 2006
Scope:
This test method covers the determination of the amount of
carbon residue (Note 1) left after evaporation and pyrolysis of an
oil, and is intended to provide some indication of relative
coke-forming propensities. This test method is generally applicable
to relatively nonvolatile petroleum products which partially
decompose on distillation at atmospheric pressure. Petroleum
products containing ash-forming constituents as determined by Test
Method D 482 or IP Method 4 will have an erroneously high carbon
residue, depending upon the amount of ash formed (Note 2 and Note
4).
NOTE 1—The term carbon residue is used throughout this
test method to designate the carbonaceous residue formed after
evaporation and pyrolysis of a petroleum product under the
conditions specified in this test method. The residue is not
composed entirely of carbon, but is a coke which can be further
changed by pyrolysis. The term carbon residue is continued
in this test method only in deference to its wide common usage.
NOTE 2—Values obtained by this test method are not numerically
the same as those obtained by Test Method D 524. Approximate
correlations have been derived (see Fig. X1.1), but need not apply
to all materials which can be tested because the carbon residue
test is applied to a wide variety of petroleum products.
NOTE 3—The test results are equivalent to Test Method D 4530,
(see Fig. X1.2).
NOTE 4—In diesel fuel, the presence of alkyl nitrates such as
amyl nitrate, hexyl nitrate, or octyl nitrate causes a higher
residue value than observed in untreated fuel, which can lead to
erroneous conclusions as to the coke forming propensity of the
fuel. The presence of alkyl nitrate in the fuel can be detected by
Test Method D 4046.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- Conradson carbon residue
- lubricants
- petroleum products
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