ASTM D3244-97(2002)
(Practice)Standard Practice for Utilization of Test Data to Determine Conformance with Specifications
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
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Standards Content (Sample)
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An American National Standard
Designation: D 3244 – 97 (Reapproved 2002)
Standard Practice for
Utilization of Test Data to Determine Conformance with
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Specifications
This standard is issued under the fixed designation D3244; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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
propertyofaspecificsamplebyanygiventestmethodusuallywillnotgivepreciselythesameanswer.
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.
Manydifficultiesthatariseininterpretingspecificationsareduetotestimprecision.Becauseofthis,
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 2.2 ISO Standard:
ISO 4259 Determination andApplication of Precision Data
1.1 This practice covers guidelines with which two parties,
in Relation to Methods of Test
usually a supplier and a receiver, can compare and combine
independentlyobtainedtestresultswheneverthereisaproduct
3. Terminology
quality dispute.
3.1 Definitions:
1.2 This practice defines a technique for comparing an
3.1.1 acceptance limit (AL), n—a numerical value that
assigned test value with a specification limit.
defines the point between acceptable and unacceptable quality.
1.3 This practice applies only to those test methods which
3.1.1.1 Discussion—The AL is not necessarily the specifi-
specifically state that the repeatability and reproducibility
cation limit. It is a value that takes into account the specifica-
values conform to the definitions herein.
tion value, the test method precision, and the confidence level
2. Referenced Documents desiredfordefiningminimumacceptablequalityrelativetothe
specification value.
2.1 ASTM Standards:
3.1.2 assignedtestvalue(ATV),n—theaverageofallresults
D1319 Test Method for Hydrocarbon Types in Liquid
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obtained in the several laboratories which are considered
Petroleum Products by Fluorescent Indicator Adsorption
acceptable based on the reproducibility of the test method.
D4057 Practice for Manual Sampling of Petroleum and
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3.1.3 determination, n—the process of carrying out the
Petroleum Products
series of operations specified in the test method whereby a
D4177 Practice for Automatic Sampling of Petroleum and
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single value is obtained.
Petroleum Products
3.1.4 dispute, n—when there is a question as to product
E29 Practice for Using Significant Digits in Test Data to
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quality because a test value obtained falls outside the accep-
Determine Conformance with Specifications
tance limit.
3.1.5 operator, n—a person who normally and regularly
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This practice is under the jurisdiction ofASTM Committee D02 on Petroleum carries out a particular test.
ProductsandLubricantsandisthedirectresponsibilityofSubcommitteeD02.94on
3.1.6 precision, n—thedegreeofagreementbetweentwoor
Quality Assurance and Statistics.
more results on the same property of identical test material. In
Current edition approved Dec. 10, 2002. Published March 2003. Originally
publishedasanappendixtothe1968AnnualBookofASTMStandards,Part18.Last
previous edition approved in 1997 as D3244–97.
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Annual Book of ASTM Standards, Vol 05.01.
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Annual Book of ASTM Standards, Vol 05.02. Available from American National Standards Institute, 25 W. 43nd St., 4th
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Annual Book of ASTM Standards, Vol 14.02. floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 3244 – 97 (2002)
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. tiesarecorrectlystatedonlabelsorinotherdescriptionsofthe
3.1.7 receiver, n—any individual or organization who re- product.
ceives or accepts the product delivered by the supplier. 4.1.2 Thispracticecanbeimplementedinthosecaseswhere
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 the product to a shipper
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