PROFICIENCY TESTING BY INTERLABORATORY COMPARISONS
ILT - E - 22 Round 7 Chemical Analysis of Steel samples According Standard E1086 and ASTM E415
October 2018
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RV01 Spiro 918 2A Adrogué (1846), Buenos Aires, Argentina. Tel. /Fax: 54 11 6009-1221
[email protected] www.ptinterlaboratory.com
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Index 1. Introduction 2. Objective 3. Organization 4. Procedure 4.1 Start and finish dates 4.2 Selection of samples 4.3 Shipping the samples and the results form 4.4 Conducting the testing 4.5 Parameters to be measured 4.6. Statistical treatment of the results 4.7. Metrological traceability details and measurement uncertainty of all reference value. 4.8. Uncertainty of the reference values. 4.9. Data and statistical summaries, including assigned values and range of acceptable results and graphical representations. 4.10. Procedures used to set any value assigned 4.11. Procedures used to establish the standard deviation for proficiency assessment or other evaluation criteria 4.12. Assigned values and statistical summaries for methods / testing procedures used by each group of participants (if different groups of participants use different methods) 4.13. Homogeneity and stability 4.14. Information on the design and implementation of proficiency testing program 4.15. Continuous test programs. 4.16. Confidentiality 5. Final Report 6. Expertise 7. Fees 8. Application form
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1. Introduction International standards such as ISO/IEC 17043 define proficiency test as evaluation of participant performance against pre-established criteria by means of interlaboratory comparisons. This program sets out the general criteria for the implementation of technical proficiency test mode for interlaboratory comparisons. The purpose of the program is to evaluate the performance of the participating laboratories, on the basis of objective evidence through the results they produce and report to ILT – Interlaboratory Test as proficiency testing provider. The participation in this proficiency test is open to accredited and not accredited laboratories worldwide.
2. Objective The objective of the ILT-E-22 program is the chemical analysis of steel samples according standard ASTM E1086 and ASTM E415.
3. Organization Proficiency testing provider: ILT - Interlaboratory Test S.A. Coordinator ILT-E-22 program: Ing. Tulio A. Palacios Statistical Consulting: Ing. Jorge Rodriguez Technical Consulting: Ing. Tulio A. Palacios
3.1 Outsourced Activities.
Statistical advice was subcontracted to Ing. Eduardo Rodriguez.
4. Procedure 4.1. Start and finish dates Start date: October 2018. Finish date (Estimated): 30 days after receiving results from all the participants.
4.2. Selection of samples ILT – Interlaboratory Test sent two specimens of steel of 20 mm x 25mm x 2mm. The participants received the samples on October 2018 (estimated).
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4.3 Shipping the samples and the results form ILT – INTERLABORATORY TEST provides the samples and the participants also receive a form to be completed with the results of each test. This form should be sent for evaluation by e-mail to:
[email protected]
The deadline to send the test results is 20 days from the date of receipt the sample. Each participant laboratory receives, as well, an instructive and a numeric code in order to keep anonymous for confidential reasons. 4.3.1 Lost or damaged of test items In case of lost or damaged proficiency test items, ILT send a new sample from the same batch (where possible)
4.4 Conducting the testing The participant laboratories will use the technique and equipment necessary. The test must be conducted under normal routine conditions and the technical responsible must complete the results form.
4.5 Parameters to be measured The parameter measured is the composition of Steel samples.
4.6. Statistics treatment of results The statistical treatment is based on ISO 13528 standard and ISO 17043. The assigned values of the 4 parameters will be determined as consensus values of the data of all participants. Robust statistics as indicated in ISO 13528 standard will be used to obtain a consensus assigned value X (robust median), a robust standard deviation (s*) and the uncertainty u x of the assigned value. The performance evaluator is the Z score that is defined as follows:
z
x X s
*
Where x is the result obtained by the participating laboratory and X is the assigned value If z 2 , the result is considered acceptable. If 2 z 3 , the result is questionable. If
z
3 , the result is not acceptable.
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If for any of the parameters the condition u x
0, 3 (with the assigned standard deviation s ˆ
fulfilled, then the performance evaluator will be z '
ˆ
x X s
2
*
2
*
) is not
.
u x
4.7. Metrological traceability and uncertainty of measurement of assigned values detailed
This type of program is quantitative; traceability to material reference or standard or uncertainty of measurement is necessary.
4.8. Uncertainty of the reference values
Not applicable as there is no reference value.
4.9. Data and statistical summaries, including assigned values and range of acceptable results and graphical representations.
Not applicable as there is no reference value.
4.10. Procedures used to set any value assigned
Not applicable as there is no reference value.
4.11. Procedures used to establish the standard deviation for proficiency assessment or other evaluation criteria
Please, see 4.7.
4.12. Assigned values and statistical summaries for methods / testing procedures used by each group of participants (if different groups of participants use different methods)
Not applicable for this program.
4.13. Homogeneity and stability
The samples are homogeneous among themselves, as they were taken of the same batch. The samples are sufficiently stable to ensure that they will not undergo any significant change throughout the conduct of the proficiency testing, including storage and transporte conditions.
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4.14. Information on the design and implementation of proficiency testing program The design of this program is open to accredited and not accredited laboratories. The assigned values are obtained by consensus.
4.15. Continuous test programs. ILT declares that this program is not continuous.
4.16. Confidentiality To ensure that the results of each laboratory will be known only by the participant, ILT - Interlaboratory Test assigns a numerical code together with the samples to be measured, respecting the confidentiality of the data as our management system establishes.
ILT declares that eliminate of proficiency test program participants who have made collusion or falsify the results. In the case that ILT suspects that the participants have made collusion or falsify the results, will contact them to request the relevant explanations. ILT also agree not previously broadcast the identity of the participants.
5. Final Report Program results will be informed with a final report sent to the participants laboratories taking into account our confidential procedure. The final report and the participation certificate shall be sending to the participants by email. 5.1. Advice on the interpretation of the statistical analysis Not applicable because the statistical analysis has one interpretation only. 5.2. Comments or recommendations based on the results of proficiency testing round Not applicable, because ILT makes no comments or recommendations unless exceptions 5.3. Comments proficiency testing provider and technical advisers on the performance of the participants Comments will be defined under "conclusions" of the report. The coordinator and the technical expert expressed that the result is satisfactory / unsatisfactory accordingly.
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6. Expertise ILT uses expertise to:
i) plan or participate in technical meetings with participants. a) planning test programs. b) identify and resolve difficulties foreseen in the preparation and maintenance of test items homogeneous or in determining a stable value assigned to an item of fitness proficiency test.
c) prepare detailed instructions for participants. d) comment on any technical difficulties or other comments submitted by participants in previous rounds of proficiency testing. e) advise on the performance evaluation of participants. f) to comment on the results and performance of the participants as a whole and, where appropriate, on individual participants or groups of participants. g) advise participants (within the limits of confidentiality), either individually or within the report. h) to respond to feedback from participants.
7. Fees The fee to participate on this proficiency testing is U$D 500 (five hundred dollars). Shipping costs are not included in the cost. (All shipping cost set by ILT do not include local import charges or taxes which will be covered by the participant). ILT cannot guarantee the number of participants that will return results for any particular parameter in each round. The program start date may be delayed if we didn`t have the minimum number of participants. Transfer costs must be paid by the laboratory receiving this service. ILT reserves the right to not send samples or the report for previous samples to any participant that has not paid whiting the terms stated on the invoice. If for some reason, a participant withdraws from participating in the program once sent the samples, must pay the shipping cost more U$D 100. The forms of payment are: International Bank transfer (Bank transfer charges 35U$D must be paid by the participant.), Credit Card by PayPal (there is a 6% service charge that will be added to the testing price and shipping). Please, once the payment has been made, send us correspondent proof to
[email protected]
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8. Application form See the next file.
Ing Tulio A. Palacios Coordinator ILT-E-22 program
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