1、STD*BSI BS EN L2047-ENGL 1797 LbZibbS Ob21234 353 BRITISH STANDARD Solid fertilizers - Measurement of static angle of repose The European Standard EN 12047 : 1996 has the status of a British Standard ICs 65.080 BS EN 12047 : 1997 NO COPYING WITHOUT ES1 PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
2、 BS EN 12047 : 1997 Amd. No. Date Committees responsible for this British Standard Text affected The prepamtion of his British Standard was entrusted to Technid Committee CIIB7, Fertilizers and related chemicals, upon which the following bodies were represented: Association of Public Analysts Britis
3、h Aggregate Construction Materials Industries Chemical Industries Association Consumers Association Fertiliser Manufadmers Associaiion Ltd. Institute of ?i.ading Standards AdnMstmh on Laboratory of the Government Chemist Ministry of Agriculture, Fisheries and Food Water Services Association of Engla
4、nd and Wales This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1997 O BSI 1997 The foliowing BSI references reiate to the work on this standard: Co
5、mmittee reference CI37 Announced in BSZ Update October 1995 ISBN O 680 27623 6 * m * STD.BS1 BS EN L2097-ENL 1797 m 1b24bb9 Ob2123b 126 m BS EN 12047 : 1997 Contents Committees responsible page inside front cover National foreword ii Foreword 2 Specification 1 Scope 2 Normative references 3 Denition
6、 4 principle 5 ApP- 6 Procedure 7 Expression of resuits 4 8 Precision 4 9 Testreport 4 Annex ZA (informative) Bibliography 5 Figure 1 Apparatus for the determination of static angle of repose 4 O BSI 1997 1 STDmBSI BS EN 12047-ENGL 1997 i Lb2qbb b21237 b2 BS EN 12047 : 1997 National foreword This Br
7、itish Standard has been prepared by Technical Committee Cm7, and is the English language version of EN 12047 : 1996, Solid fercil.izers - Memrernent of static angle of repose (IS0 8398 : 1989 modified), published by the European Co if necessary, this condition can be achieved by fdg a suitable lter
8、paper on the surace of the baseplate. Four straight lines shall be drawn at angles of 45“ to each other, intemxting at the cenixe of the Plate. 6.3 Funnel support, comprising a frame of substantial construction to support the funnel (6.1) so that the axis of the funnel passes through the centre of t
9、he baseplate and the tip of the funnel spout is 120 mm above the surface of the baseplate. 6 Procedure 6.1 Test sample We a test sample of appropriate size. NOTE. Usually 10 kg will be sufficient. 6.2 Determination 6.2.1 Carry out the determination at ambient temperature. 6.2.2 Check that the base-p
10、late (6.2) is level and that the funnel (6.1) is properly located and fixed in the support (6.3). 6.2.3 Pour the test sample (6.1) int the funnel (6.1) with the slide closed. Then open the slide and alow the fertilizer to discharge in a steady stseam, takmg care not to vibrate the apparatus. if the
11、amount of fertilizer is not sufficient, i.e. if the top of the cone which is formed on the base-plate does not reach the tip of the funnel spout, pour an additional amount of the test sample into the funnel in a steady stream with the slide still open until the top of the cone reaches the tip of the
12、 funnel spout Mark the circumference of the base of the cone on the eight radii drawn on the baseplate, ignoring any grains which form only a single layer around the base of the cone. Remove the fertilizer from the base-plate and measure the four masked diameters. O BSi 1997 STD.BSBS-N 12047-ENGL 19
13、77 Lb24bb9 Ob21291 593 Page 4 EN12047:1996 I Dimensions in millimetres Slide Funnel support (5.31 N 01 I -1 1 I / Square base-plate (5.21 1- 7 50 -_ - Figure 1. Apparatus for the determination of static angle of repose 7 Expression of results The angle of repose, a, expressed in degrees, is given by
14、 the equation: a=arctanLeJ or a = arctan L+-) where: h is the height of the cone, in millimetres; ii is the arithmetic mean of the four diameters measured as specified in 6.2.3, in milhetres; 4 is the internal diameter of the funnel spout, in miiimetres. 8 Precision The precision of the method was e
15、stablished by an inter-laboratory test carried out in accordance with Is0 5725. For the oblained repeatability limit and reproducibility limit a probability level of 95 % holds. 8.1 Repeatability The absolute difference between two singie test results, obtained under repeatability conditions, will e
16、xceed 1“ on average not more than once in 20 cases. Both resuits should be considered suspect if this limit is exceeded NOTE. Repeatability conditions: Conditions where mutually independent test results are obtained with the same method on identical test material in the same laboratory by the same o
17、perator using the same equipment under the same conditions within short intervais of time. 8.2 Reproducibility The absolute difference between two single test results, obtained under reproducibility conditions, wil exceed 2“ on average not more than once in 20 cases. Both results should be considere
18、d suspect if this limit is exceeded NOTE. Reproducibility conditions: Conditions where test resuits are obtained with the same method on identical test material in different laboratories with different operators using different equipment under different conditions. 9 Tkst report The test report shal
19、l include the foilowing particulais. a) the reference of the method used, i.e. EN 12047; b) methods of sampljng and sample preparation; c) the results and the method of expression used; d) details of any unusual features noted during the detemhatioq e) details of any operations not specified in this
20、 Internafionai Standard, or in the Internalional Standard to which reference is made, or regarded as optional. O BSI 1997 STD-BSI BS EN 12047-ENGL 1777 H Lb24bb7 Ob212Li2 42T W Page 6 EN 12047 : 1996 Annex ZA (informative) Bibliography IS0 3963 : 1977 Fert.izers - Sampling fmm a conveyor by stopping
21、 ULe belt IS0 7742 1988 Solid fertil- - Reucth Of IS0 8358 : 1991 samples samples for chem.ical and physical analysis Solid fertil- - Simple sampling method for Smau lots Sampling of solid frtiizers and liming materials solid fm - Prepamtzon of IS0 8633 : 1992 EN 1482 : 1996 * * u) O BSll997 - - STD
22、SBSI BS EN LZU47-ENGL 1777 = 1b24bb9 Ob21243 3bb BS EN 12047 : 1997 List of references See national foreword. * * rn O BSI 1997 STD-BSI BS EN LZOY7-ENGL 1777 m Lb2qbb7 Ob212YY 2T2 m BS EN 12047 : 1997 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent
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