ML20141M246

Trials W/Wultex Radiometric Ash Meter Type G3 at Yorkshire Regional Lab & Manton Colliery Coal Preparation Plant,May/ Oct 1981

ML20141M246
Person / Time
Site:	07002930
Issue date:	12/31/1981
From:	Robertson W YORKSHIRE REGIONAL LABORATORY
To:
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ML20141J561	List: ML20141J555 ML20141J595 ML20141J637 ML20141J659 ML20141K814 ML20141K834 ML20141K845 ML20141K859 ML20141K906 ML20141K936 ML20141K951 ML20141K978 ML20141K983 ML20141K998 ML20141L016 ML20141L026 ML20141L044 ML20141L847 ML20141L872 ML20141L896 ML20141L920 ML20141M246 ML20141M264 ML20141M286 ML20141M301 ML20141M341 ML20141M398 ML20141M417 ML20141M432
References
YRL-14180, NUDOCS 8602270678
Download: ML20141M246 (25)

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I YRL 14180 Trisle with the Wultex Radiometric Ash Heter

• Type G3 at Yorkshire Regional Laboratory and Hanton Colliery Coal Preparation Plant (May/ October, l'J81)

Approved by:

W.H. Robertson Regional Chief Scientist L- -

^

O O

SUMMARY

Tests to determine the expected statistical estimate of ash (95%

probability level) when using a Wultex Radiometric Ash Heter to measure the ash content of Manton, Hanton/Steetley P.S.F., were carried out during Hay, 1981, at the Yorkshire Regional Laboratory.

Thebestresultsobtajneaby_

lineer and quadratic regresrion analysis for accuracy of ash were - 2.2% and,

1.9% respectively (95% probability levels).

After consideration of these results it was decided to install a Wultex Radiometric Ash Heter on line at Manton Colliery Coal Preparation Plant and

, r comprehensive tests to prove the reliability of the meter were carried out during the period 5th-30th October,1981.

To meet the Heads of Agreement to Purchase Document arranged between the N.C.B. and Wultex Machine Co. Ltd. the integgated ash measurements over a four minute coal flow were required to be within - 2.5% of the incinerated ash content for a minimum of 95% of at least one hundred such measurements.

7 Examination of the results show fourteen measurements to be outside these limits, but if a mean difference of 1.1% ash is deducted from the Wultex Ash Meter results, only four measurements lie outside the prescribed limits.

Additionally ash comparisons for train sets during the same period are included and these results show a mean difference in ash content of 0.7%.

I Initial examination of the results for iron content indicates no significant relationship between the iron contents and the ash errors for 1

semple numbers46-100. However, further work continues using computer I

programs to establish a correction factor to improve the ash errors.

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CONTENTS f,

p :.

C W?'

3 i pi.

Introduction l

1 l

Description of Equipment

[d, Test Samples and Procedure I

s' I

l

1. 7 Conclusions I v3 l

f-Acknowledgements a

l 1

APPENDIX i

1 M

Tables - Laboratory Trials t

1)

Counts /second, ash and moisture contents of the laboratory test samples 2)

Counts /second, ash and moisture contents of additional laboratory test samples i

3-6) Linear end quadratic regression analysis for the laboratory 9

1 y

test samples

\\

l

\\

7)

Summary of laboratory srial 3

l Tables - On Site Trials 8)

Ash comparisons, total moisture 9)

Differences in ash results 10).

Total moistures, ash comparisons and ash differences for i

l train sets filled during the test period 11)

Total sulphurs and iron contents for sample numbers46-100 Fiqures l

.i 1)

Linear and quadratic regression analysis for laboratory test i

i samples 2)

Plant performance tests - ash error as calibrated 3)

Plant performance tests - ash error adjusted for mean bias l

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1) Introduction he

..j g '

At the request of Mr. P. Camn.ack, Deputy Chief Coal Preparation Engineer, tests were carried out at the Yorkshire Regional Laboratory and Manton s

Colliery Coal Preparation Plant with the Wultex Radiometric Ash Heter Type G3

'J to assess its suitability for measuring the ash content of Manton and

'p; }-

Menton /Steetley coal blends in an on line situation.

2) Description of Equipment n

The Wultex G3 Ash Heter utilises the principle of back scattered radiation to provide a means for on line measurement of ash contents and consists of the following component parts,

- source block

- system for head mounting and coal layer shaping

- high voltage feeder

)

- sensing element of coal layer presence

- attachment box

- electronic convarting device After the preliminary tests at the Yorkshire Regional Laboratory, the Wultex Ash Heter was installed at Manton Col)lery Coal Preparation Plant in s

August 1981.

The source block and detector are sited in a caged area above the P.S.F. outloading belt. A compact coal bed is presented to the Ash Heter by means of deep troughing and the levelling device.

The electronic converter attachment box and ash recorder are situated in the plant laboratory some one hundred and fifty yards from the source block.

The measuring method for ash content is based on the principle of monitoring the back scatter of gamma radiation.

The Ash Heter contains a 50mC1 Americium 241 isotope, and radiation from this source penetrates into the coal and is absorbed or back scattered to a degree dependent on the elements pr,esent in the coal. Elements in the ash constituents of the coal absorb more radiation than the combustible elements thus by measuring the back scattered radiation a measure of the cleanliness of the coal is obtained.

No compensation is made in thic apparatus for iron compounds within the coal.

3) Test Samples and Procedure a) Laboratory Trial Initially, thirty three samples of varying proportions of Manton and Steetley coal were collected. Subsequcntly, a further fourteen samples within the expected ash range of Manton Power Station fuel were collected. The test box was filled with -50mm coal sample, any excess being scraped off level before submission to the Ash Heter. 3 x 2 minute count periods were then monitored and the results recorded. After emptying the box, mixing and recharging the coal, the above procedures were twice repeated, thus average a

counts /second of back scattered radiation were recorded for each sample.

The samples were then analysed for moisture and ash contents (B.S.1016 Part 3).

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aus L

l b) On Site Trini E

.[ ~

Compech:nalva tNts to prove the Ash Meter calibration dsrived from ths 3-laboratory results were carried out during 5th-30th October, 1981, at Manton Colliery Coal Preparation Plant.

The source block and detector were k, '. -

positioned above the P.S.F. outloading belt.

A compact coal bed was presented to the Ash Meter and integrated ash measurements over a period of four minutes were recorded, the corresponding coal being automatically sampled (B.S.1017 Part 1) and analysed for moisture and ash contents (B.S.1016 Part 3).

'[

4) Conclusions

,e The laboratory tests show a good relationship between the 'as received' kJ ash level of Manton coal blend and the back scattered radiation as monitored

)u by the Wultex Radiometric Ash Meter.

r-The best results obtained by linear and quadratic regression analysis for accuracy of ash were 1 2.2% and 1 1.9% respectively (95% probability levels).

From this information the Wultex Radiometric Ash Heter was programmed to f

display % Ash instead of counts /second and comprehensive tests to prove the reliability of the meter were carried out at Manton Colliery Coal Preparation

• ,. r=

i f-Plant during the period 5th-30th October, 1981. Examination of the results show fourteen measurements to be outside the limits set in the Heads of Agreement to Purchase Document (1 2.5% ash).

All fourteen results were above F

the oppar limit, but after adjusting the Wultex readings for a mean bias of h

+1.1% ash, only four results lie outside the prescribed limits.

The bias within the Ash Meter was not constant, i.e. +0.8% for samples above the mean incinerated ash and 1.4% for samples below the mean incinerated ash; probablo

,41,,.,

contributions to this variation in bias being the shallow bed depth and the g,

high top size of the coal.

A-

5) Acknowledge < tents L

The co-operation and assistance of M.R.D.E., Bretby, South Yorkshire Coal w3 Preparation, Manton Colliery and Wultex staff is gratefully acknowledged.

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.W r Radiometric Ash Meter hm Counts /second, ash and moisture contents of the test samples s'..

Ni Sample Counts /sec.

Ash %

Total Colliery s.,.

No. "

(As received basis)

Moisture %

14 2271 3.4 8.5 Hanton 16 1907 8.5 6.4 8N' 28 1724 15.3 8.8 18 1693 17.4 7.7 24 1681 17.4 9.3 19 1622 18.4 7.9 30 1587 21.2 8.4 3

1322 30.6 7.9 9

1318 37.7 7.8 6

1288 37.3 6.9 15 2003 5.7 8.8 13 2189 3.5 8.7 Steetley 21 2075 6.5 10.3 18 2057 7.6 10.8

'a 26A 2036 6.7 10.6 17 1975 10.3 12.1 26 1921 10.2 11.5 16 1898 10.4 13.6 27 1876 11.4 13.1 22 1837 12.5 13.4 6

1567 18.1 9.4 1

1488 29.5 7.8 13 2071 7.1 7.1 Manton and 12 2052 6.4 7.4 Steetley 11 1999 9.4 7.7 21 1939 9.1 5.6 16 1838 10.5 6.4 29 1824 11.8 7.0 30 1818 12.7 8.0 23 1746 16.2 10.3 19 1611 19.8 10.4 7

1311 34.3 6.2 3

1296 33.5 6.2

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O Table 2 Radiometric Ash Heter t'

Counts /second, ash and moisture contents of a further 14 samples d'

within the expected ash range A-

@ Sample Counts /sec.

Ash %

Total Colliery No.

(Classical method)

Hoisture %

(as received)

'.i '

24 1844 11.4 6.9 Hanton and E.

17 1680 18.5 10.1 Steetley

~

20 1688 17.2 9.7

d 28 1645 17.5 11.2 18 1681 17.2 9.2 27 1681 16.6 8.0 Hanton 17 1702 17.6 6.8 29 1654 18.5 7.5 25 1666 18.5 7.6 23 '

1690 17.9 6.4 7..

t

5 1670 19.5 9.7 Steetley 8

1552 24.9 9.0 J-10 1598 23.6 8.8

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Radiometric Ash Meter Summary of results No. of 33 Manton, Steetley _14 Manton, Steet ley 30 within 28 within Samples Manton/Steetley Manton/Steetley expected expected ash range ash range i

Ash range %

(as received basis) 3.4-38.6 11.4-24.9 10.2-24.9 10.2-24.9 Total Moisture Range %

5.6-13.6 6.4-11.2 6.4-13.6 6.4-13.6 Expected Accuracy of Ash %

(Linear regression) 1 5.4 1 2.5 1 2.7 1 2.2

6 6

j

,;j Expected i

Accuracy of A2 %

(Quadratic r

regression) 1 3.2 1 2.4 1 2.6 1 1.9 l

4

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t e;.

9-

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' ' ' ' - ~ - '

O O ""ite neoie etric ae" "ete e

~

Comparison of Ash results (Wultex Ash Heter v Standard Method)

Date Sample Train Set Total Ash % (as received basis)

No.

No.

Hoisture %

Nultex Ash Standard Meter Method BS1016 Part 3 5.10.81 1

288 8.8 15.2 12.3 5.10.81 2

288 8.3 15.0 12.9 5.10.81 T

288 8.2 15.0 14.4 5.10.81 4

288 9.2 13.8 11.6 5.10.81 5

288 8.0 14.9 14.7 6.10.01 6

292 9.5 18.9 15.7 6.10.81 7

292 8.6 17.5 16.5 6.10.81 8

292 8.0 18.3 15.9 6.10.81 9

292 6.0 19.2 16.0 6.10.81 10 292 10.4 14.0 12.1 7.10.81 11 295 9.1 22.9 21.2 7.10.81 12 295 0.6 16.6 17.5 7.10.81 13 295 7.9 16.0 15.6 7.10.81 14 296 6.9 21.2 19.9 7.10.81 15 296 8.2 18.5 17.6 8.10.81 16 299 7.9 14.2 13.8 8.10.81 17 299 8.0 14,6 14.3 8.10.81 18 300 7.6 14.3 14.4 8.10.81 19 300 7.7 15.7 17.1 8.10.81 20 300 8.8 16.3 18.4 9.10.81 21 304 8.4 16.1 16.9 l

9.10.01 22 304 8.4 18.1 16.5 9.10.81 23 304 8.0 16.3 16.6 9.10.81 24 304 7.9 18.1 19.3 9.10.81 25 304 8.5 17.6 18.0 12.10.81 26 307 7.9 22.0 20.2 12.10.01 27 309 10.5 17.0 15.8 12.10.81 28 309 8.7 17.2 15.9

'1 12.10.81 29 339 8.7 20.1 18.9 12.10.81 30 309 7.7 18.8 19.8 13.10.81 31 311 8.8 16.2 16.3 I

13.10.81 32 311 8.3 17.2 16.0 13.10.81 33 311 7.2 18.8 16.5 13.10.81 34 311 7.6 17.7 18.3 13.10.01 35 312 8.3 19.1 18.9 14.10.81 36 314 8.I 17.0 12.7 14.10.81 37 314 7.4 17.5 14.2 i

14.10.01 38 315 8.9 18.7 16.7 14.10.81 39 315 8.2 18.4 15.4 14.10.01 40 315 8.6 18.2 16.2 15.10.81 41 319 3.1 15.4 13.1 15.10.81 42 319 8.6 16.4 13.2 m

3 m

.), v -

Det, Sarple Train Set Total Anh % (n3 raccived bacia)

No.

No.

_Holuture %

Wultex Ash Standard 3

Meter Method 8S1016 Part 3

]

15.10.81 43 319 8.3 16.3 14.1 15.10.81 44 319 8.7 14.7 12.0 J

15.10.81 45 319 9.7 16.8 14.0 "E

16.10.01 46 323 9.6 15.6 13.6 I

V 16.10.81 47 323 10.9 16.1 13.7 i

16.10.81 48 323 9.2 16.2 12.9

,s 16.10.81 49 323 8.7 17.6 16.2 i

16.10.81 50-323 9.0 17.3 16.7 I

)

19.10.81 51 327 8.4 16.9 16.1 19.10.81 52 327 9.6 17.5 16.6 19.10.81 53 327 9.7 17.5 17.5 19.10.81 54 328 9.9 17.9 17.9 19.10.81 55 328 8.8 1.1 16.8 20.10.81 56 333 10.2 18.9 19.2 9

20.10.81 57 333 9.0 16.4 16.4 20.10.01 58 333 8.7 17.8 17.0 20.10.81 59 333 9.2 19.7 20.0 20.10.81 60 333 8.6 15.6 16.5 y

21.10.81 61 337 0.4 15.3 15.4 4

21.10.81 62 337 8.7 16.0 16.4 21.10.81 63 337 7.8 17.2 16.2 21.10.81 64 337 7.3 17.8 16.6 J

21.10.81 65 337 8.6 17.6 15.9 22.10.81 66 341 8.8 18.6 17.0 22.10.81 67 341 8.8 16.2 15.0 22.10.81 68 341 7.9 18.1 16.2 22.10.81 69 341 9.1 16.5 15.4 22.10.81 70 341 8.5 15.4 13.8 w

23.10.81 71 346 8.5 17.6 16.5 23.10.81 72 346 8.4 16.0 14.9 23.10.81 73 346 8.2 15.0 14.3 23.10.81 74 346 10.1 18.6 18.5 23.10.81 75 346 8.6 18.6 17.9 23.10.01 76 346 8.9 15.2 15.5 27.10.81 77 351 8.8 14.5 13.6 27.10.81 78 351 8.9 14.6 14.5 27.10.81 79 351 9.2 17.6 16.3 27.10.81 80 351 9.2 15.1 15.3

~

27.10.81 81 351 9.0 14.0 13.2 27.10.81 82 352 9.0 14.9 14.1 27.10.81 83 352 8.7 17.2 16.1 28.10.01 84 355 8.5 15.9 15.5 28.10.81 85 356 8.4 18.0 16.2 28.10.81 86 356 8.3 14.0 13.0 7

28.10.81 87 356 8.7 14.3 13.2 1

28.10.01 88 356 8.8 12.6 11.7 28.10.81 89 356 8.1 14.8 12.3 7

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n Det7 Sample Train Set Jotal Ash % (as received basis)

No.

No.

Hoisture %

Wultex Astl Standard

{

Meter Method i..

BS1016 Part 3

)

g/ 20.10.81 90 356 8.9 13.2 12.2 29.10.81 91 359 7.5 17.0 14.2 29.10.81 92 359 8.0 18.8 15.9

)

29.10.81 93 359 9.4 17.6 16.0 29.10.81 94 359 8.5 15.3 13.9

)

f 29.10.81 95 359 8.2 17.7 16.1

" 29.10.81 96 359 8.3 20.5 17.1

}

• 29.10.81 97 359 9.2 18.6 15.4

)

,;~ 30.10.81 30.10.81 98 363 9.1 13.2 14.3 99 363 8.1 13.9 15.5 30.10.81 100 363 8.3 13.4 15.5

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,; g 1) On 28th, 29th, 30th October, 1901, Manton Cool Preparation Plant operated intermittently

2) On 30th October,1981, the Manton Cool Blend contained large proportions of Wached Doubleu

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Dif ferrncen in Ash liesults:- Ash Met er - Incincrried Anh N

% Ash (ns reed, basis)

Sample No.

Wultex Ash Meter Incinerated Ash Difference

~

(BS 1016 Part 3)

\\

1-5 15.0 13.2

+1.8 6-10 17.6 15.2

+2.4 11-15 19.1 18.4

+0.7 7

16-20 15.0 15.6

-0.6 21-25 17.2 17.4

-0.2 1

s 26-30 19.0 18.1

+0.9 31-35 17.0 16.8

+1.0 q

36-40 18.0 15.0

+3.0 41-45 15.9 13.3

+2.6 46-50 16.6 14.6

+2.0 7

51-55 17.2 17.0

+0.2 56-60 17.7 17.8

-0.1 61-65 17.0 16.1

+0.9 7

66-70 17.0 15.5

+1.5 71-75 17.2 16.4

+0.8 a

76-80 15.4 15.0

+0.4 81-85 16.2 15.0

+1.2 i

86-90 13.8 12.5

+1.3 91-95 17.3 15.2

+2.1 96-100 15.9 15.5

+0.4 1-10 16.3 14.2

+2.1 1-20 16.7 15.6

+1.1 7

1-30 17.2 16.3

+0.9 1-40 17.3 16.3

+1.05 1-50 17.1 15.8

+1.3 3

1-60 17.1 16.0

+1.1 1-70 17.1 16.0

+1.1 1-80 17.0 16.0

+1.0 1-90 16.0 15.7

+1.05 1-100 16.8 15.7

+1.1 Samples < Mean incinerated nch % (i.e. <l5.7% Ash) 46 samples 15.4 14.0

+1.4 m

Samples > Menn incinerated ash % (i.e. >l5.7% Ash) 54 semples 10.0 17.2

+0.8 Hean difference = 1.1% Ash Student'o t tect chovic ' t' = 8.25 i

14 samples (NLmberg 1, 6, 9, 35, 37, 39, 42, 44, 45, 48, 91, 92, 96, 97) are outside the limit - 2.5% ach of the incinerated ash content.

If the mean difference of 1.1% is subtracted from the Wu are outside the limit -} tex results, 4 samples (Numbers 20, 36, 99, 100) 2.5% ash of the incintrated och content.

L

Train Set - Comparinon Wulten Anh Meter /

inerntor Ash

.o -

(as received bauis)

% Ash (as received basia)

Train Set Total Wultex Incinernted Difference No.

Holuture %

Anh Meter HS1016 Pt. ]

Wultex-Incinernted

~

288 9.2 15.3 13.7

+1.6 39 8.2 16.1 14.4

+1.7 290 8. 4.

15.0 14.7

+0.3 291 8.4 15.3 15.2

+0.1 292 8.1 17.4 15.9

+1.5 293 8.5 15.2 15.6

-0.4 294 9.0 18.2 17.9

+0.3 295 9.2 18.2 17.2

+1.0 296 9.5 17.1 16.1

+1.0 297 8.2 16.3 16.9

-0.6 298 8.0 17.6 17.0

+0.6 299 9.0 15.6 15.1

+0.5 300 8.8 16.0 16.0 NIL 301 8.2 15.6 16.1

-0.5 302 8.3 20.7 17.0

+3.7 303 9.7 15.8 15.4 40.4 3 04 8.6 16.7 17.1

-0.4 305 8.7 16.1 17.2

-1.1

~

306 8.3 16.1 15.7

+0.4 307 7.8 16.9 19.8

-2.9 308 8.9 18.2 15.3

+3.0 309 8.2 18.5 18.5 NIL 310 9.4 18.6 16.9

+1.7 311 9.1 17.7 15.8

+1.9 312 7.7 17.8 18.0

-0.2 313 8.4 16.7 16.9

-0.2 314 7.G 16.6 15.1

+1.5 315 8.7 17.8 16.4

+1.4

~

316 8.3 16.1 16.2

-0.1 317 7.8 17.2 15.9

+1.3 318 8.8 16.6 15.3

+1.3 319 8.1 16.4 15.3

+1.1 320 8.5 15.8 13.9

+1.9 321 8.1 16.6 15.4

+1.2 322 8.7 16.4 12.4

+2.0 323 11.5 18.4 16.6

+1.8 324 10.4 16.2 15.0

+1.2

~

325 9.7 16.7 17.5

-0.8 326 8.6 18.3 17.3

+1.0 327 7.8 17.6 17.4

+0.2 328 9.3 16.0

'6.6

+0.2 329 8.9 16.9 16.7

+0.2 330 8.8 14.4 14.5

-0.1 332 8.9 17.9 15.6

+2.3 333 9.5 17.4 15.0

+2.4 3-334 10.3 16.3 15.3

+1.0 n.

i7' o

o

% Ash (ns received basis)

Train Set Total

Waltex, Incinerated Difference No.

Hoisture %

Anh Het er 11S tll16 P t. 3 Wultex-Incinerated J

335 9.1 17.7 15.6

+2.1 336 8.1 19.7 15.6

+4.1 337 7.3 16.8 15.0

+1.8 338 9.3, 16.5 14.2

+2.3 1

339 8.4 16.2 15.0

+1.2 a

340 7.5 17.9 15.7

+2.2 341 9.2 17.0 15.1

+1.9 342 8.7 14.6 13.7

+0.9 343 8.7 14.7 13.7

+1.0 344 8.1 14.7 15.4

-0.7 345 8.5 15.2 14.1

+1.1 346 9.6 16.3 16.5

-0.2 347 9.2 16.8 16.2

+0.6

~

348 8.2 15.5 15.1

+0.4 7

349 8.5 16.9 14.5

+2.4 350 9.2 16.5 17.8

-1.3 351 8.6 17.7 16.1

+1.6 352 9.0 16.1 14.7

+1.4 353 9.2 16.9 18.9

-2.0 354 8.5 15.8 13.9

+1.9 355 8.7 16.3 15.4

+0.9 356 9.3 16.5 17.0

-0.5 357 9.9 16.7 16.2

+0.5 358 9.1 17.7 17.7 NIL 359 8.7 17.3 16.1

+1.2 360 8.8 16.8 16.1

+0.7 361 8.2 17.3 17.3 NIL 362 9.8 16.2 15.7

+0.5 363 8.4 14.9 14.5

+0.4 M

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o Hanton P.S.F.t-Total Sulphur % and Iron Content %

Wultex Sample Nos.46-100 1

1 Sample Total Inherent Tntn1 Sulphur %

Fe % Air No.

Holsture % Hointure %

Air Dried Dry As Reed. Oried Basis Hanis Banis Onsis 46 9.6 2.5 2.20 2.26 2.04 1.29 47 10.9 2.4 2.21 2.26 2.02 1.35 48 9.2 2.2 2.28 2.33 2.12 1.32 49 8.7 2.4 2.14 2.19 2.00 1.34 50 9.0 2.2 2.24 2.29 2.08 1.39 51 8.4 2.2 2.18 2.23 2.04 1.35 52 9.6 2.3 2.22 2.27 2.05 1.36 53 9.7 1.0 2.30 2.34 2.11 1.42 7

54 9.9 2.1 2.27 2.32 2.09 1.44 55 8.8 2.1 2.22 2.27 2.07 1.34 56 10.2 2.0 2.31 2.36 2.12 1.38 57 9.0 1.9 2.22 2.26 2.06 1.36 58 8.7 2.0 2.22 2.27 2.07 1.44 59 9.2 1.9 2.29 2.33 2.12 1.51 60 8.6 2.1 2.21 2.26 2.06 1.40 61 8.4 2.7 2.21 2.27 2.08 1.33 62 8.7

_2.2 2.22 2.27 2,07 1.39 63 7.8 2.7 2.28 2.34 2.16 1,42 64 7.3 2.3 2.24 2.29 2.13 1.37

.i 65 8.6 2.1 2.34 2.39 2.18 1.40 66 8.8 2.4 2.15 2.20 2.01 1.40 67 8.8 2.3 2.24 2.29 2.09 1.32 68 7.9 2.3 2.26 2.31 2.13 1.35 69 9.1 2.3 2.22 2.27 2.07 1.34 70 8.5 2.3 2.20 2.25 2.06 1.24 71 8.5 1.9 2.29 2.33 2.14 1.36

-.1 72 8.4 2.0 2.21 2.26 2.07 1.32 73 8.2 2.0 2.25 2.30 2.11 1.34

~'

74 10.1 2.0 2.15 2.19 1.97 1.38 75 8.6 1.9 2.28 2.32 2.12 1.41 76 8.9 2.1 2.26 2.31 2.10 1.31 77 8.8 2.3 2.20 2.25 2.05 1.33

-m 78 8.9 2.6 2.20 2.26 2.06 1.36 79 9.2 2.4 2.18 2.23 2.03 1.31 BG 9.2 1.8 2.22 2.26 2.05 1.29 81 9.0 1.9 2.24 2.28 2.08 1.23 82 9.0 2.1 2.26 2.31 2.10 1.22 83 8.7 1.6 2.40 2.44 2.23 1.35

)

84 8.5 1.6 2.28 2.32 2.13 1.28 85 8.4 1.9 2.22 2.26 2.07 1.34 86 8.3 2.2 2.16 2.21 2.03 1.17 87 8.7 3.3 2.12 2.19 2.00 1.19 88 8.8 2.8 2.20 2.26 2.06 1.18 89 8.1 3.1 2.22 2.29 2.11 1.23 90 8.9 3.4 2.22 2.30 2.09 1.19

I

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Samplo Total inherent Total Sulphur %

fe % Air

. No.

Hoisture % Mcinture %

Air Dried Dry As Reed.

Dried Basis Basis Basis Basis 91 7.5 3.0 2.26 2.33 2.16 1.30 92 8.8 2.9 2.10 2.25 2.05 1.37 93 9.4 2.9 2.26 2.33 2.11 1.42 94 8.5 3.0 2.28 2.35 2.15 1.31 95 8.2 3.1 2.27 2.34 2.15 1,44 96 8.3 3.4 2.26 2.34 2.15 1.44 97 9.2 3.2 2.26 2.33 2.12 1.40 98 9.1 3.1 2.23 2.30 2.09 1.33 99 8.1 3.0 2.25 2.32 2.13 1.36 100 8.3 3.1 2.10 2.25 2.06 1.35 9

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Distribution Mr. A.D. Hakower, Director of Scientific Control, Harrow 47 Mr. A.B. Nichols, Asst. Director of Scientific Control, Harrow Mr. G. Armstrong, Area Chief Scientist, Scottish Area Mr. C. Scott, Area Chief Scientist, North Cast Area Mr. N. Wood, Regional Chief Scientist, Cast Midlands Region

'l, Mr. 3.H. Atkin, Area Chief Scientist, Western Area Mr. S.J. Criddle, Area Chief Scientist, South Midlands Area

~~

Mr. R.H. Thomas, Area Chief Scientist, South Wales Aren Mr. R.R. English, Area Coal Prep. Cngineer, South Yorkshire Area Mr. B.C. Radford, Dep. Area Coal Prep. Cngineer, South Yorkshire Area Mr. P. Cammack, Head of Coal Preparation, H.R.D.E., Bretby Mr. M.P. Armstrong, Head of Transducer Section, H.R.D.E.

^

Mr. E.J. Fox, Coal Preparation Cngineer, H.R.D.E.

Mr. J.V. Armishaw, Manager, Manton Colliery, South Yorkshire Area Mr. F. Leary, Coal Preparation Manager, Manton Colliery, South Yorkshire Area Mr. D. Clark, Sales Manager, Wultex Machine Co. Ltd.

Mr. S. Hill, Draughtsman, Wultex Machine Co. Ltd.

{

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- - - - - - - -