ASTM D3244-97

Standard Practice for Utilization of Test Data to Determine Conformance with Specifications

SCOPE
1.1 This practice covers guidelines with which two parties, usually a supplier and a receiver, can compare and combine independently obtained test results whenever there is a product quality dispute.  
1.2 This practice defines a technique for comparing an assigned test value with a specification limit.  
1.3 This practice applies only to those test methods which specifically state that the repeatability and reproducibility values conform to the definitions herein.

General Information

• Status: Historical
• Publication Date: 09-Nov-1997
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.94 - Coordinating Subcommittee on Quality Assurance and Statistics

Relations

• Replaced By: ASTM D3244-97(2002) - Standard Practice for Utilization of Test Data to Determine Conformance with Specifications
• Effective Date: 10-Dec-2002

Standards Content (Sample)

Designation: D 3244 – 97 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Utilization of Test Data to Determine Conformance with
1
Specifications
This standard is issued under the fixed designation D 3244; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The properties of commercial petroleum products are measured by standardized laboratory test
methods to check their conformance to specifications. Two or more measurements of the same
property of a specific sample by any given test method usually will not give precisely the same answer.
Therefore, the test methods generally include a paragraph on the precision of results. This precision
is an expression of the reliability of the value of the measured property.
Many difficulties that arise in interpreting specifications are due to test imprecision. Because of this,
a true value of a property can never be determined exactly; and it is necessary to infer from measured
values the range within which the “true value” is likely to lie. The main purpose of this practice is to
indicate how test imprecision should be interpreted relative to specification values.
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1. Scope Determine Conformance with Specifications
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2.2 ISO Standard:
1.1 This practice covers guidelines with which two parties,
ISO 4259 Determination and Application of Precision Data
usually a supplier and a receiver, can compare and combine
in Relation to Methods of Test
independently obtained test results whenever there is a product
quality dispute.
3. Terminology
1.2 This practice defines a technique for comparing an
3.1 Definitions:
assigned test value with a specification limit.
3.1.1 acceptance limit (AL), n—a numerical value that
1.3 This practice applies only to those test methods which
defines the point between acceptable and unacceptable quality.
specifically state that the repeatability and reproducibility
3.1.1.1 Discussion—The AL is not necessarily the specifi-
values conform to the definitions herein.
cation limit. It is a value that takes into account the specifica-
2. Referenced Documents tion value, the test method precision, and the confidence level
desired for defining minimum acceptable quality relative to the
2.1 ASTM Standards:
specification value.
D 1319 Test Method for Hydrocarbon Types in Liquid
2 3.1.2 assigned test value (ATV), n—the average of all results
Petroleum Products by Fluorescent Indicator Adsorption
obtained in the several laboratories which are considered
D 4057 Practice for Manual Sampling of Petroleum and
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acceptable based on the reproducibility of the test method.
Petroleum Products
3.1.3 determination, n—the process of carrying out the
D 4177 Practice for Automatic Sampling of Petroleum and
3
series of operations specified in the test method whereby a
Petroleum Products
single value is obtained.
E 29 Practice for Using Significant Digits in Test Data to
3.1.4 dispute, n—when there is a question as to product
quality because a test value obtained falls outside the accep-
tance limit.
3.1.5 operator, n—a person who normally and regularly
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This practice is under the jurisdiction of ASTM Committee D-2 on Petroleum
carries out a particular test.
Products and Lubricantsand is the direct responsibility of Coordinating Subcom-
mittee D02.94 on Quality Assurance and Statistics. 3.1.6 precision, n—the degree of agreement between two or
Current edition approved Nov. 10, 1997. Published September 1998. Originally
published as an appendix to the 1968 Annual Book of ASTM Standards, Part 18. Last
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previous edition D 3244 – 96.
Annual Book of ASTM Standards, Vol 14.02.
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Annual Book of ASTM Standards, Vol 05.01.
Available from American National Standards Institute, 11 W. 42nd St., 13th
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Annual Book of ASTM Standards, Vol 05.02. floor, New York, NY 10036.
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D 3244
more results on the same property of identical test material. In properties which can be tested and expressed numerically.
this practice, precision statements are framed in terms of the 4.1.1 This practice can be used to ensure that such proper-
repeatability and reproducibility of the test method. ties are correctly stated on labels or in other descriptions of the
3.1.7 receiver, n—any individual or organization who re- product.
ceives or accepts the product delivered by the supplier. 4.1.2 This practice can be implemented in those cases where
3.1.8 repeatability (r), n—quantitative expression of the a supplier uses a commercial testing laboratory to sample and
random error associated with a single operator in a given test a product prior to releasing th
...