COAL CONCEPTS PROFICIENCY TESTING GENERAL ANALYSIS … · • ISO Ash x 3 • ISO volatile matter x...

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COAL CONCEPTS PROFICIENCY TESTING

GENERAL ANALYSIS SAMPLE

REPORT – ONE HUNDRED AND THREE

Revision 00

Final report

DATE ISSUED: 31 MAY 2020

PARTICIPANT

SCHEME COORDINATOR: K MUNSAMY

SIGNATURE

CHECKED BY: R BABOOLAL (SCHEME MANAGER)

Disclaimer: Opinions and interpretations expressed herein are outside the scope of SANAS accreditation *Moisture in the analysis sample is not included in the SANAS schedule of accreditation as robust statistics cannot be applied.

Chlorine, Fluorine, Quick ash, ASTM ash and ASTM Volatiles is not included in the scope of accreditation.

THINKING QUALITY, QUALITY THINKING

REGISTRATION NUMBER: 2006/149731/23 (RMB INDUSTRIAL STATIONERS cc t/a)

81 CERAMIC CURVE, ALTON, RICHARDS BAY 3900 l TEL: +27(0)35 751 2446 l CEL: +27(0)83 6500151 l FAX: 0862605793

E-MAIL: [email protected] l [email protected]

LABORATORY CODE:

mailto:[email protected]

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EXECUTIVE SUMMARY

1. One hundred and two samples were sent to participants with 94 timeous result submissions

2. The total number of outliers found were as follows (dry base):

• ISO Ash x 3

• ISO volatile matter x 5

• Calorific value x 1

• Total sulphur x 2

3. Chlorine, Fluorine, ASTM Ash, ASTM Volatile Matter, Carbon, Hydrogen and Nitrogen participants were insufficient to

warrant robust statistical calculations. 4. Trending for your laboratory is as follows:

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TABLE OF CONTENTS

ITEM

PAGE NUMBER

Letter to participant

4

List of participants

5

Type of sample used

6

Preparation of sample

6

Homogeneity check

6

Stability check

7

ISO Ash data

8

ISO Ash z-score trend

9

Quick Ash data 10

Quick Ash trend 11

ISO Volatile matter data

12

ISO Volatile matter z-score trend

13

Calorific value data

14

Calorific value z-score trend

15

Total sulphur data

16

Total sulphur z-score trend

17

Phosphorous data and Z-Score trend

18

Carbon data / Hydrogen data / Nitrogen data

19

AFT data and z-scores

20

ASTM Ash and ASTM Volatile matter, Chlorine & Fluorine 21

Conclusion

22

Terms & Conditions 23

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Dear Participant

RE: PROFICIENCY TESTING RESULTS FOR THE MONTH OF MAY 2020 Thank you for your participation in the Coal Concepts proficiency testing scheme.

Your laboratory code is as per the cover page.

All results are totally confidential. Any results in Bold, Italics and Underlined are outliers. Where applicable, the most

extreme outliers have been eliminated from calculations using the Grubbs estimate for outliers. Robust statistics has

been applied where possible. Analysis results have been reported on air dry and dry base. The dry base results have

been used to calculate the z-scores.

Please take note of the following:

1. Z-scores between -1 and +1 is deemed acceptable

2. Z-scores between -2 and -3 should serve as a warning that the analysis result could get worse

3. Z-scores between +2 and +3 should also serve as a warning that analysis results could get worse.

4. Z- scores lower than -3 and exceeding +3 should warrant an investigation

5. Compare your result to the robust average which will be the assigned value. The measurement of uncertainty (UoM)

of the results is also stated.

6. All calculations can be made available upon request

The Coal Concepts scheme adheres to the requirements of ISO/IEC 17043:2010 – Conformity assessment – General

requirements for proficiency testing.

Statistical analysis has been carried out using ISO/IEC 13528:2015-Statistical methods for use in proficiency testing by

interlaboratory comparisons

Please find results attached together with Z-score trends.

Best Regards

R Baboolal

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LIST OF PARTICIPANTS IN ALPHABETICAL ORDER

Arcelor Mittal - Vanderbijl Park Arcelor Mittal - Newcastle

Anglo SOC - Goedehoop Colliery South Plant Anglo SOC - Goedehoop Colliery North Plant

Anglo SOC - Kleinkopje Colliery Anglo SOC - Greenside Colliery

Afrisam - Dudfield Alfred H Knight -Richards Bay Laboratory

Afrisam - Ulco AquaSpecto

Botswana Power Corporation - Morupule B Power Station Bureau Veritas Inspectorate Laboratories - Middelburg

Bureau Veritas – Moatize, Vale Bureau Veritas - Nacala

Bureau Veritas Inspectorate Laboratories - Tendele Bureau Veritas Inspectorate Laboratories - Beira

Bureau Veritas Inspectorate Laboratories - Alton Bureau Veritas Testing & Inspection SA - Pretoria

Bureau Veritas Inspectorate Laboratories - Belfast

Castle Peak – Hong Kong Cotecna South Africa - Nasonti

Cotecna South Africa - Lurco Cotecna South Africa - Phola

Cotecna South Africa – Tselentis Cotecna South Africa - Kangala

Cotecna South Africa - Middelburg Cotecna Ubumbene(Pty)Ltd - Umlabu

- Umlabu Cotecna South Africa - Mimosa Cotecna South Africa - VDD

Cotecna South Africa - Droogvallei Cotecna South Africa - AMR

Delmas Coal Eyethu Coal Mooifontein

Eyethu Coal Wilge Eskom Holdings SOC Ltd - Matimba Power Station

Eskom Holdings SOC Ltd – Kendal Power station Eskom Holdings SOC Ltd - Duvha Power Station

Eskom Holdings SOC Ltd – Lethabo Power Station Eskom Holdings SOC Ltd - Komati Power Station

Eskom Holdings SOC Ltd - Tutuka Power Station Eskom Holdings SOC Ltd - Grootvlei Power Station

Eskom Holdings SOC Ltd - ERID Eskom Holdings SOC Ltd - Kriel Power Station

Eskom Holdings SOC Ltd - Hendrina Power Station Eskom Holdings SOC Ltd – Majuba Power Station

Eskom Holdings SOC Ltd - Arnot Power Station Exxaro Resources - Grootegeluk Mine

Eskom Holdings SOC Ltd - Matla Power Station Eskom Holdings SOC Ltd – Medupi Power Station

Exxaro Resources - Matla Mine G&W Base & Industrial Minerals

Glencore Wonderkop Glencore -Rustenburg Smelter

Glencore Boshoek Smelter Glencore -Lydenburg Smelter

Glencore Lion Smelter Hwange Colliery – Zimbabwe

HighVeld Laboratories Idwala Lime

Intertek Mozambique Kangra Coal (Pty) Ltd

Jindal Mining SA Pty Ltd – Kiepersol Colliery Mpumamanzi Group CC

Khwezela Colliery - Landau Mafube Colliery Mine PTY (Ltd)

Lafarge Industries SA (Pty) Ltd - Lichtenburg Mitra SK South Africa (PTY) Ltd

Morupule Coal Mine - Botswana Noko Analytical Services CC - Welgemeend

Msobo Coal PTY Ltd Noko Analytical Services CC - Twistdraai

M L Coal PTY Ltd Quality Ensure Eastside Laboratory

Noko Analytical Services CC - Hakahno Ronewa Lab Middelburg

Noko Analytical Services CC - Witbank Ronewa Lab Ubuntu

Richards Bay Minerals Seriti - New Vaal Colliery

RSA Labs Siza Coal Services - Vlakfontein

Seriti - Kriel Colliery Siza Coal Services - Kinross

Siza Coal Services - Wescoal Siza Coal Services - NCC

Siza Coal Services - Botswana Siza Coal Services - Mooiplaats

Siza Coal Services - Middelburg Siza Coal Services - Sasolburg

Siza Coal Services - Carolina Siza Coal Services - NBC

Siza Coal Services - Wildfontein South 32 – Khutala Colliery

Siza Coal Services - Umlalazi Sibonisiwe Coal Laboratory Services CC - West Coal Processing

Sibonisiwe Coal Laboratory Services CC - Vaalbult Sibonisiwe Coal Laboratory Services CC – Mzimkhulu

Sibonisiwe Coal Laboratory Services CC SABS Commercial SOC Ltd Richards bay

Sibonisiwe Coal Laboratory Services CC – Elandsfontein SABS Commercial SOC Ltd Secunda

SABS Commercial SOC Ltd CSIR SABS Commercial SOC Ltd Springlake

SABS Commercial SOC Ltd Uitkomst UIS Analytical Services

SPTE Lab - Middelburg Umzamo Analytical Services - Witbank

Tata Steel – Wales Lab, Europe Umzamo Analytical Services - Sudor

Umzamo Analytical Services - Overlooked Colliery Zululand Anthracite Colliery

Umzamo Analytical Services - Doornrug

Vitrovian Analytical Services DELMAS

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1. TYPE OF SAMPLE USED

The coal used in this proficiency testing round was bituminous coal

2. PREPARATION OF SAMPLE

Approximately 1000kg’s of sample with an approximate topsize of 50mm was sourced. This was crushed to -

4mm using a jaw crusher. The -4mm material was reduced to -212um using a cross beat pulveriser. The 212

material was sieved using a 212um screen. Any +212um material was pulverised and sieved until all material

passed through the 212 um sieve.

All the -212um material was then mixed in a mixing drum for 4 hours.

3. HOMOGENEITY CHECK

There were 110 participants in this round, 10 portions of sample were randomly extracted. These were

packaged in their final form i.e. in 200ml sample bottles. The bottles were labelled 1 to 10. The results were as

follows:

SAMPLE NO.

TEST PORTION 1

TEST PORTION 2

sample av (Xt) range (Wt) range sqd

1 24,60 24,37 24,49 0,23 0,0529

2 24,38 24,44 24,41 0,06 0,0036

3 24,38 24,29 24,34 0,09 0,0081

4 24,43 24,54 24,49 0,11 0,0121

5 24,39 24,40 24,40 0,01 0,0001

6 24,37 24,41 24,39 0,04 0,0016

7 24,45 24,66 24,56 0,21 0,0441

8 24,37 24,31 24,34 0,06 0,0036

9 24,25 24,42 24,34 0,17 0,0289

10 24,34 24,31 24,33 0,03 0,0009

GENERAL AVERAGE 24,41 STANDARD DEVIATION 0,079 WITHIN SAMPLE STANDARD DEVIATION 0,088

BETWEEN SAMPLE STANDARD DEVIATION 0,048

The between sample standard deviation must be ≤ 0.3 x ơ

(ơ = std deviation for the proficiency assessment)

Ơ = 2% of the mean was used, which is the repeatability for ISO ash (Ash % > 10%)

Hence 0.3 x 0.488 = 0.146

Since 0.048 < 0.146, the samples are homogenous

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4. STABILITY CHECK Samples were retained for sales as reference material. Ten of them were randomly chosen for stability testing.

In order for the proficiency testing samples to be declared stable the general average from the homogeneity

check and that of the stability check the difference in the general average should not differ by more than 0.3 X

precision.

This test has been carried out about a month after the samples were received by the participating laboratories

SAMPLE NO.

TEST PORTION 1

TEST PORTION 2

sample av (Xt) range (Wt) range sqd

1 24,39 24,37 24,38 0,02 0,0004

2 24,37 24,69 24,53 0,32 0,1024

3 24,41 24,75 24,58 0,34 0,1156

4 24,41 24,80 24,61 0,39 0,1521

5 24,41 24,69 24,55 0,28 0,0784

6 24,38 24,78 24,58 0,40 0,1600

7 24,43 24,69 24,56 0,26 0,0676

8 24,41 24,69 24,55 0,28 0,0784

9 24,37 24,73 24,55 0,36 0,1296

10 24,39 24,67 24,53 0,28 0,0784

GENERAL AVERAGE 24,54 STANDARD DEVIATION 0,061 WITHIN SAMPLE STANDARD DEVIATION 0,219

BETWEEN SAMPLE STANDARD DEVIATION

0,142

(Ơ = 0.566 was used)

For this report 0.3 x 0.491 = 0.147

Absolute value of (24.54– 24.41) = 0.13

Since 0.13 < 0.147 the proficiency testing samples were stable

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COAL CONCEPTS - PROFICIENCY TESTING -MAY 2020

ANALYTICAL PARAMETER : ISO ASH (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE)

1a 3,64 24,34 25,26 0,85

6a 3,72 24,22 25,16 0,12

7a 3,12 24,72 25,52 2,65

9a 3,73 24,18 25,12 -0,15

10a 3,50 24,20 25,08 -0,42

12a 3,50 24,30 25,18 0,30

18a 3,19 24,23 25,03 -0,77

21a 3,23 24,30 25,11 -0,19

23a 3,43 24,34 25,20 0,47

28a 3,34 24,20 25,04 -0,71

33a 3,40 24,25 25,10 -0,24

35a 4,17 23,90 24,94 -1,39

36a 3,30 24,30 25,13 -0,06

37a 3,60 24,15 25,05 -0,60

38a 3,24 24,17 24,98 -1,11

42a 3,80 24,50 25,47 2,31

49a 3,84 24,19 25,16 0,13

58a 3,17 24,39 25,19 0,35

59a 3,55 24,30 25,19 0,40

60a 3,50 24,21 25,09 -0,35

66a 3,05 24,30 25,06 -0,51

67a 3,20 24,40 25,21 0,48

69a 2,85 24,39 25,11 -0,23

71a 3,40 24,40 25,26 0,85

73a 2,81 24,36 25,06 -0,52

74a 2,73 24,47 25,16 0,13

76a 3,80 24,03 24,98 -1,11

78a 1,20 24,11 24,40 -5,15

79a 3,60 24,30 25,21 0,49

80a 3,50 24,40 25,28 1,03

82a 3,50 24,29 25,17 0,23

83a 3,20 24,30 25,10 -0,24

88a 3,70 24,38 25,32 1,25

91a 2,90 24,30 25,03 -0,79

92a 6,76 24,01 25,75 4,29

95a 3,65 23,93 24,84 -2,11

96a 3,44 24,30 25,17 0,19

99a 3,30 24,20 25,03 -0,79

100a 3,50 24,14 25,02 -0,86

101a 3,71 24,30 25,24 0,69

105a 3,10 24,70 25,49 2,47

106a 3,70 24,39 25,33 1,32

110a 3,42 24,39 25,25 0,81

112a 3,60 24,30 25,21 0,49

117a 3,15 24,48 25,28 0,97

124a 3,48 24,24 25,11 -0,17

135a 3,49 24,32 25,20 0,43

139a 3,02 24,28 25,04 -0,71

143a 3,05 24,33 25,10 -0,30

145a 3,65 24,30 25,22 0,58

146a 3,50 24,40 25,28 1,03

151a 3,64 24,26 25,18 0,27

162a 3,62 24,20 25,11 -0,20

167a 3,60 24,20 25,10 -0,24

169a 3,59 24,44 25,35 1,49

170a 3,40 24,10 24,95 -1,33

171a 2,68 23,31 23,95 -8,31

177a 2,51 24,35 24,98 -1,13

179a 3,30 24,30 25,13 -0,06

184a 3,50 24,00 24,87 -1,87

190a 3,20 24,30 25,10 -0,24

191a 3,10 24,30 25,08 -0,42

192a 3,40 24,20 25,05 -0,60

195a 3,77 24,12 25,06 -0,51

198a 3,70 24,25 25,18 0,31

201a 3,03 23,96 24,71 -3,01

205a 3,85 24,29 25,26 0,87

Number of results - 67 67 67 -

OUTLIERS - - 1 3 -

AVERAGE - 3,41 24,27 25,14 -

STD DEVIATION - - 0,15 0,14 -

MEDIAN 24,30 25,12

ROBUST AVERAGE - - 24,27 25,14 -

ROBUST STD DEVIATION - - 0,15 0,15 -

UoM 0,02 0,02

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-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

Z-SC

OR

E

LABORATORY ID

ISO ASH Z-SCORE TREND

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ANALYTICAL PARAMETER : QUICK ASH (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%)

Z-SCORE (DRY BASE)

8a 2,60 24,50 25,15 0,28

21a 3,23 24,48 25,30 0,96

22a 2,49 23,96 24,57 -2,48

23a 3,43 24,36 25,23 0,62

35a 4,17 24,10 25,15 0,25

36a 3,30 24,30 25,13 0,16

37a 3,60 24,25 25,16 0,29

39a 3,10 24,30 25,08 -0,08 41a 2,60 24,40 25,05 -0,21 49a 3,84 24,15 25,11 0,09 50a 2,66 24,00 24,66 -2,08 59a 3,55 24,14 25,03 -0,32 74a 2,73 24,40 25,08 -0,05 77a 3,80 24,10 25,05 -0,20 84a 4,40 24,10 25,21 0,54 92a 6,76 23,91 25,64 2,60 94a 3,85 24,13 25,10 0,00 98a 3,03 24,15 24,90 -0,90 100a 3,50 24,10 24,97 -0,57 101a 3,71 24,40 25,34 1,16 102a 3,00 24,10 24,85 -1,18 105a 3,10 24,60 25,39 1,38 113a 3,69 24,35 25,28 0,89 130a 3,10 24,30 25,08 -0,08 133a 3,63 24,18 25,09 -0,02 138a 3,89 24,27 25,25 0,74 140a 3,41 24,28 25,14 0,20 143a 3,05 24,23 24,99 -0,49 145a 3,65 24,10 25,01 -0,39 153a 3,37 23,70 24,53 -2,69 162a 3,62 24,20 25,11 0,07 163a 3,30 24,50 25,34 1,14 169a 3,59 24,13 25,03 -0,32 176a 3,20 24,50 25,31 1,02 178a 3,08 24,23 25,00 -0,45 179a 3,30 24,20 25,03 -0,33 181a 3,00 24,20 24,95 -0,70 182a 2,70 24,60 25,28 0,89 184a 3,50 24,20 25,08 -0,08 185a 3,62 24,48 25,40 1,44 187a 2,45 24,78 25,40 1,46 188a 2,43 24,45 25,06 -0,17 189a 3,52 24,38 25,27 0,83 190a 3,20 24,10 24,90 -0,94 191a 3,10 24,10 24,87 -1,06 192a 3,40 24,10 24,95 -0,70 198a 3,70 24,28 25,21 0,56 199a 3,91 23,90 24,87 -1,06 Number of results - 48 48 48 - OUTLIERS - - 0 0 -

AVERAGE - 3,38 24,24 25,10 -


MEDIAN 24,22 25,09

ROBUST AVERAGE - - 24,24 25,10

ROBUST STD DEVIATION - - 0,21 0,21

UoM 0,04 0,04

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-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00Z-

SCO

RE

LABORATORY ID

QUICK ASH Z-SCORE TREND

of 23 COAL CONCEPTS - PROFICIENCY TESTING -MAY 2020

ANALYTICAL PARAMETER : ISO VOLATILE MATTER (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE)

1a 3,64 16,79 17,42 -0,69

6a 3,72 16,78 17,43 -0,68

7a 3,12 16,61 17,14 -1,54

8a 2,60 16,80 17,25 -1,22

9a 3,73 16,94 17,59 -0,18

10a 3,50 17,10 17,72 0,21

12a 3,50 17,20 17,82 0,52

18a 3,19 16,87 17,43 -0,68

21a 3,23 17,23 17,81 0,47

22a 2,49 17,32 17,76 0,34

23a 3,43 16,80 17,40 -0,76

28a 3,34 17,50 18,10 1,37

33a 3,40 16,68 17,27 -1,17

35a 4,17 17,01 17,75 0,30

36a 3,30 16,80 17,37 -0,84

37a 3,60 16,95 17,58 -0,21

38a 3,24 18,55 19,17 4,61

39a 3,10 16,98 17,52 -0,40

41a 2,60 17,20 17,66 0,02

42a 3,80 17,10 17,78 0,38

49a 3,84 16,63 17,29 -1,08

50a 2,66 17,03 17,50 -0,47

58a 3,17 17,26 17,83 0,53

59a 3,55 17,23 17,86 0,64

60a 3,50 16,66 17,26 -1,17

66a 3,05 17,48 18,03 1,15

67a 3,20 16,90 17,46 -0,58

69a 2,85 16,90 17,40 -0,78

71a 3,40 18,00 18,63 2,98

73a 2,81 18,48 19,01 4,13

74a 2,73 16,68 17,15 -1,53

76a 3,80 16,27 16,91 -2,24

77a 3,80 18,20 18,92 3,84

78a 1,20 17,97 18,19 1,63

79a 3,60 17,10 17,74 0,26

80a 3,50 16,80 17,41 -0,73

82a 3,50 16,16 16,75 -2,74

83a 3,20 17,20 17,77 0,35

88a 3,70 17,10 17,76 0,32

91a 2,90 17,50 18,02 1,13

92a 6,76 13,28 14,24 -10,33

94a 3,85 17,23 17,91 0,80

95a 3,65 17,25 17,90 0,76

96a 3,44 17,13 17,74 0,27

98a 3,03 17,90 18,46 2,45

99a 3,30 17,10 17,68 0,10

100a 3,50 20,62 21,37 11,27

101a 3,71 17,41 18,08 1,30

102a 3,00 17,20 17,73 0,24

105a 3,10 17,60 18,16 1,55

106a 3,70 17,26 17,92 0,82

110a 3,42 16,84 17,44 -0,65

112a 3,60 17,00 17,63 -0,05

113a 3,69 17,01 17,66 0,03

117a 3,15 16,70 17,24 -1,24

124a 3,48 16,59 17,19 -1,40

130a 3,10 16,90 17,44 -0,64

133a 3,63 16,85 17,48 -0,51

135a 3,49 16,97 17,58 -0,22

138a 3,89 17,18 17,87 0,67

139a 3,02 16,85 17,37 -0,84

140a 3,41 17,10 17,70 0,16

143a 3,05 17,18 17,72 0,21

145a 3,65 16,90 17,54 -0,34

146a 3,50 16,70 17,31 -1,05

151a 3,64 17,03 17,67 0,07

162a 3,62 17,19 17,84 0,56

167a 3,60 17,30 17,95 0,89

169a 3,59 16,60 17,22 -1,31

170a 3,40 17,10 17,70 0,15

179a 3,30 17,50 18,10 1,35

181a 3,00 17,70 18,25 1,81

182a 2,70 17,30 17,78 0,39

184a 3,50 17,00 17,62 -0,11

187a 2,45 17,75 18,20 1,65

188a 2,43 17,30 17,73 0,24

189a 3,52 17,28 17,91 0,78

190a 3,20 17,00 17,56 -0,27

191a 3,10 17,30 17,85 0,61

192a 3,40 16,80 17,39 -0,79

195a 3,77 16,94 17,60 -0,14

198a 3,70 16,70 17,34 -0,94

199a 3,91 17,10 17,80 0,44

201a 3,03 17,20 17,74 0,26

205a 3,85 16,67 17,34 -0,95

NUMBER OF RESULTS - 85 85 85 -

OUTLIERS - - 4 5 -

AVERAGE - 3,37 17,08 17,65 -

STD DEVIATION - 0,36 0,33 -

MEDIAN 17,10 17,68



UoM - - 0,05 0,05

of 23

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

92a

82a

76a

7a 74a

124a

169a

117a

8a 60a

33a

49a

146a

205a

198a

36a

139a

192a

69a

23a

80a

1a 18a

6a 110a

130a

67a

133a

50a

39a

145a

190a

135a

37a

9a 195a

184a

112a

41a

113a

151a

99a

170a

140a

10a

143a

188a

102a

201a

79a

96a

35a

88a

22a

83a

42a

182a

199a

21a

12a

58a

162a

191a

59a

138a

95a

189a

94a

106a

167a

91a

66a

101a

179a

28a

105a

78a

187a

181a

98a

71a

77a

73a

38a

100aZ-SC

OR

E

LABORATORY ID

VOLATILE MATTER Z-SCORE TREND

of 23 COAL CONCEPTS - PROFICIENCY TESTING -MAY 2020

ANALYTICAL PARAMETER : CALORIFIC VALUE (MJ/kg)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (MJ/kg) DRY BASE (MJ/kg)

Z-SCORE (DRY BASE)

1a 3,64 23,10 23,97 -0,54

6a 3,72 23,41 24,31 0,67

8a 2,60 23,90 24,54 1,46

9a 3,73 23,17 24,06 -0,22

10a 3,50 23,29 24,13 0,0

12a 3,50 23,19 24,03 -0,33

18a 3,19 23,26 24,03 -0,35

21a 3,23 23,37 24,15 0,09

23a 3,43 23,20 24,02 -0,38

28a 3,34 23,37 24,18 0,18

33a 3,40 23,61 24,44 1,12

35a 4,17 22,98 23,98 -0,52

36a 3,30 23,20 23,99 -0,47

37a 3,60 23,78 24,67 1,92

38a 3,24 24,60 25,42 4,59

39a 3,10 23,46 24,21 0,28

42a 3,80 24,00 24,95 2,91

49a 3,84 22,88 23,79 -1,17

50a 2,66 23,29 23,93 -0,70

58a 3,17 23,35 24,11 -0,04

60a 3,50 23,26 24,10 -0,08

66a 3,05 23,36 24,09 -0,11

67a 3,20 23,24 24,01 -0,41

71a 3,40 23,46 24,29 0,57

73a 2,81 22,62 23,27 -3,01

74a 2,73 23,34 24,00 -0,46

76a 3,80 23,57 24,50 1,33

77a 3,80 23,58 24,51 1,36

79a 3,60 23,13 23,99 -0,47

80a 3,50 23,20 24,04 -0,30

82a 3,50 23,59 24,45 1,13

83a 3,20 23,51 24,29 0,57

84a 4,40 23,34 24,41 1,02

88a 3,70 23,10 23,98 -0,51

91a 2,90 23,65 24,36 0,82

92a 6,76 22,62 24,26 0,48

94a 3,85 22,97 23,89 -0,85

95a 3,65 23,44 24,33 0,72

96a 3,44 23,28 24,11 -0,06

98a 3,03 23,26 23,99 -0,49

99a 3,30 23,07 23,86 -0,95

100a 3,50 23,59 24,45 1,13

101a 3,71 22,52 23,39 -2,61

102a 3,00 23,46 24,19 0,21

105a 3,10 23,50 24,25 0,45

106a 3,70 23,39 24,29 0,58

110a 3,42 23,27 24,09 -0,11

112a 3,60 23,13 23,99 -0,47

117a 3,15 23,34 24,10 -0,09

124a 3,48 23,13 23,96 -0,57

130a 3,10 23,25 23,99 -0,47

133a 3,63 23,37 24,25 0,44

135a 3,49 23,24 24,08 -0,16

140a 3,41 23,25 24,07 -0,19

143a 3,05 23,24 23,97 -0,55

145a 3,65 23,75 24,65 1,85

151a 3,64 23,14 24,01 -0,39

153a 3,37 23,10 23,91 -0,78

162a 3,62 24,14 25,05 3,26

163a 3,30 23,42 24,22 0,33

167a 3,60 23,42 24,29 0,60

169a 3,59 23,07 23,93 -0,70

170a 3,40 23,06 23,87 -0,90

171a 2,68 23,73 24,38 0,91

172a 3,81 22,71 23,61 -1,83

174a 4,57 22,91 24,01 -0,42

176a 3,20 23,41 24,18 0,21

177a 2,51 23,07 23,66 -1,63

179a 3,30 23,38 24,18 0,18

181a 3,00 23,39 24,11 -0,04

182a 2,70 23,32 23,97 -0,56

184a 3,50 23,16 24,00 -0,44

187a 2,45 23,18 23,76 -1,29

188a 2,43 23,33 23,91 -0,76

189a 3,52 23,45 24,31 0,64

190a 3,20 23,40 24,17 0,17

191a 3,10 23,34 24,09 -0,14

192a 3,40 23,46 24,29 0,57

195a 3,77 23,40 24,32 0,68

198a 3,70 22,89 23,77 -1,26

199a 3,91 23,05 23,99 -0,49

201a 3,03 23,15 23,87 -0,89

205a 3,85 23,55 24,49 1,30

NUMBER OF RESULTS - 83 83 83 -

OUTLIERS - - 1 1 -

AVERAGE - 3,42 23,30 24,13 -


MEDIAN 23,31 24,09



UoM - - 0,04 0,04 -

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-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

73a

101a

172a

177a

187a

198a

49a

99a

170a

201a

94a

153a

188a

50a

169a

124a

182a

143a

1a 35a

88a

98a

199a

36a

79a

112a

130a

74a

184a

174a

67a

151a

23a

18a

12a

80a

9a 140a

135a

191a

110a

66a

117a

60a

96a

181a

58a

10a

21a

190a

28a

179a

176a

102a

39a

163a

133a

105a

92a

71a

192a

83a

106a

167a

189a

6a 195a

95a

91a

171a

84a

33a

82a

100a

205a

76a

77a

8a 145a

37a

42a

162a

38aZ-

SCO

RE

LABORATORY ID

CALORIFIC VALUE Z-SCORE TREND

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ANALYTICAL PARAMETER : TOTAL SULPHUR (%)

LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE)

1a 3,64 0,99 1,03 0,54 6a 3,72 0,93 0,97 -0,24 7a 3,12 0,29 0,30 -8,63 9a 3,73 0,90 0,93 -0,63 10a 3,50 0,93 0,96 -0,26 12a 3,50 0,91 0,94 -0,53 18a 3,19 0,96 0,99 0,09 21a 3,23 0,94 0,97 -0,17 23a 3,43 0,88 0,91 -0,93 28a 3,34 1,05 1,09 1,28 35a 4,17 0,88 0,92 -0,84 36a 3,30 0,86 0,89 -1,20 37a 3,60 1,25 1,30 3,93 38a 3,24 1,16 1,20 2,69 39a 3,10 0,91 0,94 -0,57 42a 3,80 0,85 0,88 -1,27 49a 3,84 0,94 0,98 0,00 50a 2,66 0,99 1,02 0,41 60a 3,50 0,95 0,98 0,00 66a 3,05 0,98 1,01 0,33 69a 2,85 1,12 1,15 2,08 71a 3,40 0,88 0,91 -0,93 74a 2,73 1,14 1,17 2,36 76a 3,80 0,94 0,98 0,0 78a 1,20 0,99 1,00 0,22 79a 3,60 1,08 1,12 1,71 80a 3,50 0,90 0,93 -0,66 83a 3,20 0,95 0,98 0,0 88a 3,70 0,93 0,97 -0,24 95a 3,65 0,91 0,94 -0,51 99a 3,30 0,92 0,95 -0,42 101a 3,71 0,88 0,91 -0,89 106a 3,70 0,99 1,03 0,54 110a 3,42 0,92 0,95 -0,41 112a 3,60 0,91 0,94 -0,51 113a 3,69 0,97 1,01 0,28 130a 3,10 0,86 0,89 -1,22 133a 3,63 0,92 0,95 -0,38 135a 3,49 0,98 1,02 0,39 138a 3,89 0,85 0,88 -1,26 139a 3,02 1,05 1,09 1,27

140a 3,41 0,91 0,94 -0,54 143a 3,05 0,88 0,91 -0,97 145a 3,65 0,89 0,92 -0,77 146a 3,50 1,05 1,09 1,30 151a 3,64 0,96 1,00 0,14 162a 3,62 1,06 1,10 1,45 167a 3,60 0,86 0,89 -1,17 169a 3,59 0,94 0,98 0,00 172a 3,81 0,99 1,03 0,56 174a 4,57 0,91 0,95 -0,39 177a 2,51 0,77 0,79 -2,45 179a 3,30 0,87 0,90 -1,07 181a 3,00 1,03 1,06 0,97 188a 2,43 0,90 0,92 -0,78 189a 3,52 0,94 0,97 -0,13 190a 3,20 0,94 0,97 -0,17 191a 3,10 0,92 0,95 -0,44 192a 3,40 0,96 0,99 0,11 198a 3,70 1,07 1,11 1,59 199a 3,91 0,95 0,99 0,05 201a 3,03 1,09 1,12 1,75 205a 3,85 1,04 1,08 1,22 NUMBER OF RESULTS 63 63 63 -

OUTLIERS - - 2 2 -

AVERAGE - 3,40 0,95 0,98

MEDIAN - 0,94 0,97

STD DEVIATION - - 0,08 0,08



UoM - - 0,01 0,01

of 23

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

7a 177a

42a

138a

130a

36a

167a

179a

143a

71a

23a

101a

35a

188a

145a

80a

9a 39a

140a

12a

112a

95a

191a

99a

110a

174a

133a

10a

88a

6a 190a

21a

189a

83a

60a

49a

76a

169a

199a

18a

192a

151a

78a

113a

66a

135a

50a

1a 106a

172a

181a

205a

139a

28a

146a

162a

198a

79a

201a

69a

74a

38a

37a

Z-SC

OR

E

LABORATORY ID

TOTAL SULPHUR Z-SCORE TREND

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ANALYTICAL PARAMETER : PHOSPHOROUS IN COAL (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE

Z-SCORE (DRY BASE)

1a 3,64 0,079 0,082 2,35

7a 3,12 0,073 0,076 1,71

9a 3,73 0,062 0,064 0,52

12a 3,50 0,059 0,061 0,24

18a 3,19 0,059 0,061 0,22

21a 3,23 0,062 0,064 0,54

23a 3,43 0,051 0,053 -0,56

67a 3,20 0,056 0,058 -0,09

69a 2,85 0,034 0,035 -2,40

74a 2,73 0,067 0,069 1,03

78a 1,20 0,062 0,063 0,41

99a 3,30 0,050 0,052 -0,71

112a 3,60 0,054 0,056 -0,27

113a 3,69 0,052 0,054 -0,48

114a 3,37 0,056 0,058 -0,08

138a 3,89 0,058 0,060 0,16

139a 3,02 0,043 0,044 -1,45

146a 3,50 0,050 0,052 -0,70

169a 3,59 0,053 0,055 -0,38

172a 3,81 0,057 0,059 0,00

177a 2,51 0,056 0,057 -0,13


OUTLIERS - - 0 0 - AVERAGE - 3,24 0,057 0,059 -

STD DEVIATION - - 0,010 0,010 -

MEDIAN - 0,056 0,058

ROBUST AVERAGE - - 0,057 0,059 ROBUST STD DEVIATION - - 0,008 0,009

UoM - - 0,002 0,002

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

69a 139a 99a 146a 23a 113a 169a 112a 177a 67a 114a 172a 138a 18a 12a 78a 9a 21a 74a 7a 1a

Z-SC

OR

ES

LAB ID

PHOSPHOROUS IN COAL Z-SCORES

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ANALYTICAL PARAMETER : TOTAL CARBON (%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,64 60,74 63,03 -0,37

9a 3,73 60,56 62,91 -0,47

12a 3,50 60,40 62,59 -0,71

18a 3,19 60,79 62,79 -0,55

21a 3,23 60,55 62,57 -0,73

36a** 3,30 62,97 65,12 1,24

66a** 3,05 63,75 65,76 1,73

88a** 3,70 63,19 65,62 1,63

99a 3,30 60,90 62,98 -0,41

145a 3,65 60,30 62,58 -0,72

177a 2,51 61,10 62,67 -0,65


OUTLIERS - - 0 0 -

AVERAGE - 3,35 61,39 63,51 -

MEDIAN - - 60,79 62,91 -


REPRODUCIBILITY UPPER LIMIT - - - 64,51 - LOWER LIMIT - - - 62,51 -


ANALYTICAL PARAMETER : HYDROGEN (%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,64 2,71 2,81 -0,30

9a 3,73 2,82 2,93 0,40

12a 3,50 2,74 2,84 -0,14

18a** 3,19 2,50 2,58 -1,68

21a 3,23 2,87 2,97 0,62

36a 3,30 2,65 2,74 -0,73

88a 3,70 2,71 2,81 -0,29

99a 3,30 2,79 2,89 0,14

177a** 2,51 3,11 3,19 1,97

Number of results 9 9 9

OUTLIERS - - 0 0 -

AVERAGE - 3,34 2,77 2,86 -

MEDIAN - 2,74 2,84 -


REPRODUCIBILITY UPPER LIMIT - - 3,11 - LOWER LIMIT - - - 2,61 -


ANALYTICAL PARAMETER : NITROGEN(%)

LAB ID


Z-SCORE (DRY BASE)

1a 3,64 1,29 1,34 0,11

9a** 3,73 1,87 1,94 1,94

12a 3,50 1,29 1,34 0,10

18a** 3,19 1,03 1,06 -0,72

36a** 3,30 0,74 0,77 -1,63

88a 3,70 1,31 1,36 0,17

99a 3,30 1,28 1,32 0,06

177a 2,51 1,26 1,29 -0,03

Number of results 8 8 8 -

OUTLIERS - - 0 0 -

AVERAGE - 3,36 1,26 1,30 -

MEDIAN - 1,29 1,33 -

STD DEVIATION - - 0,32 0,33 - REPRODUCIBILITY UPPER LIMIT - - - 1,45 - LOWER LIMIT - - - 1,15 -

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ANALYTICAL PARAMETER : ASH FUSION TEMPERATURES (oC)

LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW

1a 1479 1500 1500 1500

9a 1500 1500 1500 1500

10a 1500 1500 1500 1500

18a 1500 1500 1500 1500

21a 1460 1480 1490 1500

23a 1409 1468 1499 1500

28a 1361 1416 1465 1500

38a 1500 1500 1500 1500

42a 1500 1500 1500 1500

49a 1400 1500 1500 1500

60a 1490 1500 1500 1500

95a 1480 1490 1500 1500

99a 1500 1500 1500 1500

151a 1390 1430 1460 1500

Number of results 14 14 14 14

Outliers 0 0 0 0

AVERAGE 1462 1485 1494 1500

MEDIAN 1485 1500 1500 1500

STDEV 50 28 14 0

REPRODUCIBILITY

UPPER LIMIT 1500 1500 1500 1500

LOWER LIMIT 1382 1425 1434 1420

Z-SCORES

LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW

1a 0,34 0,55 0,45 0

9a 0,76 0,55 0,45 0

10a 0,76 0,55 0,45 0

18a 0,76 0,55 0,45 0

21a -0,04 -0,16 -0,28 0

23a -1,07 -0,59 0,38 0

28a -2,03 -2,45 -2,12 0

38a 0,76 0,55 0,45 0

42a 0,76 0,55 0,45 0

49a -1,25 0,55 0,45 0

60a 0,56 0,55 0,45 0

95a 0,36 0,19 0,45 0

99a 0,76 0,55 0,45 0

151a -1,45 -1,95 -2,49 0

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ANALYTICAL PARAMETER : CHLORINE (ppm)

LAB ID


Z-SCORE (DRY BASE)

12a 3,50 120 124 -

177a 2,51 135 138 -


OUTLIERS - - - - -

AVERAGE - 3,01 128 131 -

STD DEVIATION - - 11 10 -

MEDIAN - - 128 131 -


ANALYTICAL PARAMETER : FLUORINE (ppm)

LAB ID


Z-SCORE (DRY BASE)

12a 3,50 135 140 -

169a 3,59 214 222 -

177a 2,51 206 211 -


OUTLIERS - - - - -

AVERAGE - 3,20 185 191 -

STD DEVIATION - - 43 45 -

MEDIAN - - 206 211 -


ANALYTICAL PARAMETER : ASTM ASH (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%)

DRY BASE (%)

Z-SCORE (DRY BASE)

1a 3,64 24,38 25,30 -

172a 3,81 25,60 26,61 -


OUTLIERS - - - - -

AVERAGE - 3,73 24,99 25,96 -


MEDIAN - - 24,99 25,96 -


ANALYTICAL PARAMETER : ASTM VOLS (%)

LAB ID

MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%)

DRY BASE (%)

Z-SCORE (DRY BASE)

1a 3,64 17,78 18,45 -

172a 3,81 16,81 17,48 -


OUTLIERS - - - - -

AVERAGE - 3,73 17,30 17,96 -


MEDIAN - - 17,30 17,96 -

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CONCLUSION

1. The overall ISO Ash determination trend was almost evenly distributed. The average, robust average and median are similar with three outliers detected.

2. The overall ISO volatile determination trend is positively biased. Five outliers were detected. The outliers

seemed to be due to a combination of analytical and calculation errors.

3. Calorific value graph is negatively biased. One outlier was detected.

4. The z-score trend for sulphur is negatively biased. The median, robust average and mean similar. Two

outliers were detected by Grubbs estimate.

5. Phosphorous analysis was well done with the median, robust average and mean comparing well with each

other indicating that the extreme values did not affect the centralized values.

6. Carbon, Hydrogen and Nitrogen analysis was generally well done.

7. AFT: Analysis was well done with no outliers detected at any stages.

8. Assessment criterion for homogeneity check

8.1 Comparison of the between sample standard deviation with the standard deviation for proficiency

testing Standard deviation for ISO ash =0.15 Check value = 0.15 x 0.3 = 0.045

Between sample standard deviation = 0.048 The between standard deviation is greater than the check value for the criterion assessment for

homogeneity, therefore the following assessment will be used to establish homogeneity:

Calculate ơ2 allow = (0.3 ơpt) 2 = (0.3x0.15) 2 = 0.002025

Calculate c = F1 ơ2 allow + F2s2w = (1.59 x 0.002025) + (0.57 x 0.007795) = 0,0076629

√𝑐 > 𝑆𝑠 Samples are homogenous

√0.0076629 = 0.087537992

Since 0.048 is less than 0.0875, the batch of test items is homogenous.

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COAL CONCEPTS: Terms and Conditions

Return of results: Laboratories participate in proficiency testing programs on the understanding that they will be sharing their results and information anonymously with other laboratories performing the same analysis. No return of results compromises the spirit of the programs, and reports will not be sent to laboratories unless they return results. Payment in full is required from all laboratories enrolling whether they return results or not. Errors in Participant Proficiency Testing Results: Proficiency testing reports should reflect the level of accuracy that a regular testing client would receive. If a participant finds an error in their proficiency testing results, they may notify us in writing and change their submission PRIOR to the due date for return. Changes after this time will not be accepted. Coal Concepts’ reports results as submitted by participants. On occasion, it seems as though participants have mixed up the samples or not processed the samples according to the instructions. Coal Concepts cannot make assumptions of this nature and change results 'to suit'. We also cannot compromise the integrity of the programs by suggesting to some participants that they should review their results prior to the due date. (This is unfair to other participants) It is the responsibility of the participants to check all aspects of the program, including sample identification, preparation, testing instructions, calculations and reporting of the results prior to results submission. If samples are not in good condition on arrival to the participant laboratory, Coal Concepts must be notified in writing IMMEDIATELY, as often samples can be replaced in good time. Claims about samples received in bad condition will not be accepted after the report has been issued. Late Enrolments and Late Results: Late enrolment requests cannot always be accommodated, as sample manufacture must be scheduled well in advance to the shipping date of the program to allow all necessary quality assurance activities to be carried out. Shipping of PT materials and evaluating test results from PTPs out of cycle with the mainstream programs is considerably time consuming and therefore costly. In order not to disadvantage participants able to comply with time frames, Coal Concepts may charge a late fee in the following circumstances: Requests that Coal concepts staff enters results on behalf of participants Requests to record results after the due date Requests for PTP participation that is out of cycle with the scheduled dates Shipping fees and Customs clearance: Costs incurred for shipping samples and clearance of same through customs are the responsibility of the participating laboratory unless otherwise indicated Non-payment of fees: Coal Concepts retains the right to withhold reports and/or test materials and services when invoices are outstanding. Confidentiality of results: All data and information received by Coal Concepts from its clients are considered confidential unless the client has given express permission to pass on information. Definitions: The dictionary definitions of “collusion” and “falsification” are as follows. · Collusion: A secret agreement or cooperation for a fraudulent or deceitful purpose. · Falsification: Deliberately changing something to be false. In proficiency testing terms, collusion is comparing data (and perhaps changing data) to fit in with a believed “correct” result. This is contrary to the spirit of proficiency testing programs, which are issued with the intention of providing an objective comparison of a laboratory’s performance with others. Coal Concepts tries to minimise the occurrence of collusion by being aware that laboratories should be objective when they report their results, and should therefore not know the intended results at the time they are reporting to us. Answers are not provided to clients until results have been submitted. To prevent collusion and falsification our advice to clients is: DON’T confer with others about PT samples or results. DO accept the fact that everyone makes errors. DON’T average the results or opinions of every person in the laboratory before selecting the answer to be submitted. Instead, use one of the answers AS SUBMITTED to you and take advantage of the Coal Concepts internal QA services and submit all answers generated by the technicians. DO have confidence in your own results. Proficiency Testing (PT) is a compulsory part of laboratory accreditation, but it is also an important tool for giving you confidence in your results. “Enhancing” your PT results with assistance from another participant cannot increase confidence in your laboratory’s performance. Coal concepts’ testing staff are not told what the expected results are, nor what we are expecting. We subject ALL results to analysis, even if they are different. The staff have the right to check that the results we enter on their behalf are correctly transcribed. Clients are always welcome to contact Coal Concepts to seek advice or information about collusion or falsification of data. Policy for Participant Appeal of PT Performance Assessment: If participants disagree with their performance assessment in a proficiency report, they should inform Coal Concepts in writing. The response will include Coal Concepts interpretation of the outcome of the reassessment and an explanation of that outcome. (For example, explanation of a calculation, or the rationale for the outcome of the evaluation.) If a mistake has been made by Coal Concepts, it will be dealt with via Coal Concepts’ non-conformance system. Liability In no event shall a party's liability to the other party for direct damages exceed an amount equal to the value of the amount for the PT Programme, under that specific month End of report

COAL CONCEPTS PROFICIENCY TESTING GENERAL ANALYSIS … · • ISO Ash x 3 • ISO volatile matter x...

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Transcript of COAL CONCEPTS PROFICIENCY TESTING GENERAL ANALYSIS … · • ISO Ash x 3 • ISO volatile matter x...