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Standard Test Method for Conradson Carbon Residue of Petroleum Products
Přeložit název
NORMA vydána dne 1.12.2019
Označení normy: ASTM D189-06(2019)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.12.2019
Kód zboží: NS-978377
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
Conradson carbon residue, lubricants, petroleum products,, ICS Number Code 75.080 (Petroleum products in general)
Significance and Use | ||||||||||||||||||
5.1 The carbon residue value of burner fuel serves as a rough approximation of the tendency of the fuel to form deposits in vaporizing pot-type and sleeve-type burners. Similarly, provided alkyl nitrates are absent (or if present, provided the test is performed on the base fuel without additive) the carbon residue of diesel fuel correlates approximately with combustion chamber deposits. 5.2 The carbon residue value of motor oil, while at one time regarded as indicative of the amount of carbonaceous deposits a motor oil would form in the combustion chamber of an engine, is now considered to be of doubtful significance due to the presence of additives in many oils. For example, an ash-forming detergent additive may increase the carbon residue value of an oil yet will generally reduce its tendency to form deposits. 5.3 The carbon residue value of gas oil is useful as a guide in the manufacture of gas from gas oil, while carbon residue values of crude oil residuums, cylinder and bright stocks, are useful in the manufacture of lubricants. |
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1. Scope | ||||||||||||||||||
1.1 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 D482 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 D524. 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
D4530, (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 D4046.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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2. Referenced Documents | ||||||||||||||||||
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