ASTM D3244-07a
(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 and statistical methodologies with which two parties, usually a supplier and a receiver, can compare and combine independently obtained test results to obtain an Assigned Test Value (ATV) for the purpose of resolving 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.
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Designation:D3244 −07a AnAmerican National Standard
Standard Practice for
Utilization of Test Data to Determine Conformance with
1
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 (´) 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.
1. Scope D6300Practice for Determination of Precision and Bias
Data for Use in Test Methods for Petroleum Products and
1.1 This practice covers guidelines and statistical method-
Lubricants
ologies with which two parties, usually a supplier and a
E29Practice for Using Significant Digits in Test Data to
receiver,cancompareandcombineindependentlyobtainedtest
Determine Conformance with Specifications
results to obtain anAssigned Test Value (ATV) for the purpose
3
2.2 ISO Standard:
of resolving a product quality dispute.
ISO 4259Determination and Application of Precision Data
1.2 This practice defines a technique for comparing an
in Relation to Methods of Test
assigned test value with a specification limit.
3. Terminology
1.3 This practice applies only to those test methods which
specifically state that the repeatability and reproducibility
3.1 Definitions:
values conform to the definitions herein. 3.1.1 acceptance limit (AL), n—a numerical value that
defines the point between acceptable and unacceptable quality.
2. Referenced Documents
3.1.1.1 Discussion—The AL is not necessarily the specifi-
2
2.1 ASTM Standards:
cation limit. It is a value that takes into account the specifica-
D1319TestMethodforHydrocarbonTypesinLiquidPetro-
tion value, the test method precision, and the confidence level
leum Products by Fluorescent Indicator Adsorption
desiredfordefiningminimumacceptablequalityrelativetothe
D4057Practice for Manual Sampling of Petroleum and
specification value.
Petroleum Products
3.1.2 assignedtestvalue(ATV),n—theaverageofallresults
D4177Practice for Automatic Sampling of Petroleum and
obtained in the several laboratories which are considered
Petroleum Products
acceptable based on the reproducibility of the test method.
3.1.3 determination, n—the process of carrying out the
1
This practice is under the jurisdiction ofASTM Committee D02 on Petroleum
series of operations specified in the test method whereby a
Products and Lubricants and is the direct responsibility of D02.94 on Coordinating
single value is obtained.
Subcommittee on Quality Assurance and Statistics.
Current edition approved Nov. 1, 2007. Published December 2007. Originally
3.1.4 dispute, n—when there is a question as to product
published as an appendix to the 1968 Annual Book of ASTM Standards, Part 18.
quality conformance to specification because a test value
Originally approved as a standard in 1974. Last previous edition approved in 2007
obtained falls outside the specification limit(s).
as D3244–07. DOI: 10.1520/D3244-07A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D3244−07a
3.1.5 operator, n—a person who normally and regularly becomes very large. Consequently, this definition of true value
carries out a particular test. is associated with the particular test method employed.
3.1.6 precision, n—the degree of agreement between two or
4. Significance and Use
more results on the same property of identical test material. In
this practice, precision statements are framed in terms of
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
Designation:D3244–07 Designation: D 3244 – 07a
Standard Practice for
Utilization of Test Data to Determine Conformance with
1
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.
1. Scope
1.1 This practice covers guidelines and statistical methodologies with which two parties, usually a supplier and a receiver, can
compare and combine independently obtained test results to obtain anAssigned Test Value (ATV) for the purpose of resolving 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1319 Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator Adsorption
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D6300 Practice for Determination of Precision and Bias Data for Use inTest Methods for Petroleum Products and Lubricants
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3
2.2 ISO Standard:
ISO 4259 Determination and Application of Precision Data in Relation to Methods of Test
3. Terminology
3.1 Definitions:
3.1.1 acceptance limit (AL), n—a numerical value that defines the point between acceptable and unacceptable quality.
3.1.1.1 Discussion—TheALisnotnecessarilythespecificationlimit.Itisavaluethattakesintoaccountthespecificationvalue,
the test method precision, and the confidence level desired for defining minimum acceptable quality relative to the specification
value.
3.1.2 assigned test value (ATV), n—the average of all results obtained in the several laboratories which are considered
acceptable based on the reproducibility of the test method.
1
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of D02.94 on Coordinating
Subcommittee on Quality Assurance and Statistics.
Current edition approved JulyNov. 1, 2007. PublishedAugustDecember 2007. Originally published as an appendix to the 1968 Annual Book of ASTM Standards, Part 18.
Originally approved as a standard in 1974. Last previous edition approved in 20022007 as D3244–97(2002).D3244–07.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D 3244 – 07a
3.1.3 determination, n—the process of carrying out the series of operations specified in the test method whereby a single value
is obtained.
3.1.4 dispute, n—whenthereisaquestionastoproductqualityconformancetospecificationbecauseatestvalueobtainedfalls
outside the specification limit(s).
3.1.5 operator, n—a person who normally and regularly carries out a particular test.
3.1.6 precision, n—thedegreeofagreem
...
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