1、 STD-BSI BS EN 13277-ENGL 2000 I 1b24bbS O51340 O40 BRITISH STANDARD Fertilizers - Determination of flow rate The European Standard EN 13299:2000 has the status of a British Standard ICs 65.080 BS EN 13299:2000 NO COPYNG WITHOUT BSI PERMISSION EXCEPT AS PERMIWED BY COPYRIGHT LAW STD-BSI BS EN L3299-
2、ENGL 2000 W 1b24bb9 0851341 TA7 been prepared under the direction of the Sector AmdNo. Date Committee for Materiais and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June ZOO0 O BSI 06-2000 ISBN O 580 34283 2 BS EN 13299:2000 Comments National fo
3、reword This British Standard is the official English language version of EN 13299:2000. The UK participation in its preparation was entrusted to Technical Committee CIV37, Fertilizers and related chemicals, which has the responsibility to: - aid enquirers to understand the text; - present to the res
4、ponsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed them in the UK A list of organizations represented on this committee can be obtained on request to its
5、 secretary. The United Kingdom voted against the acceptance of this standard at the CEN Formal Vote stage because of discrepancies in the instsuctions in clauses 6 to 8 that might lead to confusion in the calculation of results. In particular, the variables appearing in the various equations, and th
6、e symbols by which they are represented, are inconsistent. It is the recommendation of the BSI technical committee that equations (2) and (3) are disregarded and that equation (4) is used directly. Cross-references The British Standards which implement international or European publications referred
7、 to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contr
8、act. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover
9、. The BSI copyright notice displayed in this document indicates when the document was last issued. STD-BSI BS EN 13277-ENGL 2000 D Lb2qbbS 0851342 913 EN 13299 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM February 2000 ICs 65.080 English version Fertilizers - Determination of flow rate Engrais
10、- Dtermination du taux dcoulement Dngemittel - Bestimmung der Fliekennzahl This European Standard was approved by CEN on 12 December 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europeen Standard the status of a nation
11、al standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any
12、other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany
13、, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Porugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FR NORMUNG Centrai Secretariat: rue de Stassart, 36 B-1050 Brussels O 2000 CEN All
14、rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13299:2000 E Page 2 EN 13299:2000 Contents Page Foreword 3 Introduction . .-. . 3 1 2 3 4 5 6 7 8 8.1 8.2 9 9.1 9.2 9.3 10 Scope 4 Normative references . - 4 Principle 4 Apparatus . 4 Test po
15、rtions 5 Calibration of the funnel . 5 Procedure . 5 Expression of results 6 Calculation of the calibration factor (c) . 6 Calculation of the flow rate of the fertilizer . 6 Precision . 7 General 7 Repeatability . 7 Reproducibility 7 Test report 7 OBSI 06-2000 - STD*BSI BS EN 13277-ENGL 2000 = Lb24b
16、b9 0851344 776 Page 3 EN 13299:2000 Foreword This European Standard has been prepared by Technical Committee CENilC 260, Fertilizers and liming materials, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an i
17、dentical text or by endorsement, at the latest by August 2000, and conflicting national standards shall be withdrawn at the latest by August 2000. According to the CENEENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European St
18、andard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction The flow rate of a fertilizer provides a measure of comparison for the mass flow whe
19、n flowing out of containers or during spreading. OBSI 06-2000 STD-BSI BS EN 13277-ENGL 2000 1b24bb7 0851345 b22 W Page 4 EN 13299:2000 1 Scope This European Standard specifies a method for the determination of the flow rate of free flowing solid fertilizers. The method is not applicable to powder ma
20、terials ( 0,5 mm) or liming materials. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated referen
21、ces, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1236, Fertilizers - Determination of bulk density (loose
22、) (IS0 3944:1992 modified). IS0 3310-1, Test sieves - Technical requirements and testing - Part 1 : Test sieves of metal wire cloth. 3 Principle Measurement of the time taken for 2 kg of fertilizer to flow from a calibrated funnel into a vessel placed on a balance. 4 Apparatus 4.1 Balance, with a ca
23、pacity of at least 33 kg and capable of weighing to an accuracy off 1 g. 4.2 Funnel, as specified in EN 1236 made of stainless steel. The slide of this funnel shall be such that the orifice is completely clear when the slide is in the open position. 4.3 Collecting vessel, capable of holding at least
24、 3 kg of fertilizer, for example. 4.4 Stop-watch, with an accuracy of 0,l s. 4.5 Woven wire test sieves, conforming to IS0 3310-1 with aperture sizes 335 mm and 4,O mm. 4.6 Glass balls, for calibration of the funnel, conforming to the following requirements: - Diameter: 4 mm f 0,3 mm; - Form: spheri
25、cal; - Material: glass of density 2,5 kg/dm3; - Surface: polished. Before use, sieve the glass balls using the 4,OO mm and 3,55 mm sieves (4.5) and use only those which pass the 4,OO mm sieve and remain on the 335 mm sieve. OBSI 06-2000 STD-BSI ES EN 13299-ENGL 2000 Lb24bb7 085134b 5b9 sl Page 5 EN
26、13299:2000 5 Test portions Weigh two representative test portions of about 3 kg f 100 g each, taken from the test sample. 6 Calibration of the funnel 6.1 Pour 3 kg f 100 g of the sieved glass balls (4.6) into the closed funnel (4.2). Place the balance (4.1) under the funnel and stand the collecting
27、vessel (4.3) on it. Simultaneously, fully open the slide of the funnel and start the stop-watch. 6.2 Record the time to the nearest 0,l s. Stop the stop-watch when the balance indicates 2 kg and close the slide at the same time. 6.3 flow time of exactly 2 kg of glass bails is calculated according to
28、 equation (I): Weigh the actual amount of glass balls collected in the vessel to the nearest 1 g. The corrected where: tb,2 is the corrected flow time, in seconds, of 2 kg of glass balls; tb is the measured flow time, in seconds, of 2 kg of the glass balls; mb is the weighed mass, in kilograms, of t
29、he glass balls. 6.4 to the funnel. Completely empty the funnel into the collecting vessel. Close the funnel and return all the balls 6.5 the time (tb.2) taken for 2,O kg of the glass balls to pass through the funnel. Repeat the calibration process. Calculate the arithmetic mean (t) of the two determ
30、inations of 7 Procedure 7.1 of the sieved glass balls. Repeat the procedure described in 6.1 and 6.2 using one of the test portions (clause 5) in place 7.2 time taken for exactly 2,O kg to pass through the funnel. Weigh the actual amount of fertilizer collected in the vessel to the nearest 1 g and c
31、alculate the 7.3 Completely empty the funnel into the collecting vessel. Discard the contents. 7.4 Repeat the procedure described in 7.1 to 7.3 using the second of the two test portions. QBSI 06-2000 STD-BSI BS EN 13279-ENGL 2000 Lb24bb7 0851347 4T5 I Page 6 EN 13299:2000 8 Expression of results 8.1
32、 Calculation of the calibration factor (c) The calibration factor for the funnel is given by the equation: where: c is the calibration factor; t is the measured flow time, in seconds; 10 is the assumed flow rate, in kilograms per minute, of the glass balls through a hypothetical standard funnel. 8.2
33、 Calculation of the flow rate of the fertilizer The flow rate of the fertilizer is given in kilograms per minute by the equation: F=mf (T)xc=-xc 60 - 120 - t f where: F is the flow rate, in kilograms per minute, of the fertilizer: mf is the weighed mass, in kilograms, of the fertilizer; tf is the me
34、asured flow time, in seconds, of the fertilizer; F is the mean calibration factor. For mf = 2 the simplified equation (4) can be used: tb,2 /=lo- tf.2 (3) (4) where: - tb.* is the mean flow time, in seconds, of 2 kg glass balls to pass through the funnel; ff,2 is the flow time, in seconds of 2 kg fe
35、rtilizers to pass through the funnel. Take as the result the arithmetic mean of the two determinations if the requirement concerniig repeatability (9.1) is satisfied. If not, repeat the whole test. OBSI 06-2000 Page 7 EN 13299:2000 9 Precision 9.1 General The statistical information given here is on
36、ly intended as a guideline to what can be expected. The values are based on collaborative studies which have been carried out on urea and NPK complex fertilizers. 9.2 Repeatability The difference between two single results found on identical test material by one operator using the same apparatus wit
37、hin a short time interval should exceed the repeatability limit, r, expressed as a percentage, given by the equation: r= 0,015 f (5) where: F is the arithmetic mean of the two results; on average not more than once in 20 cases in the normal and correct operation of the method. Both results should be
38、 considered suspect if the repeatability valuer is exceeded. 9.3 Reproducibility The difference between two single and independent test results found by two operators working in different laboratories using identical test materials should exceed the reproducibility limit, R, given by the equation: w
39、here: F is the arithmetic mean of the two test results: on average not more than once in 20 cases in the normal and correct operation of the method. 10 Test report The test report shall contain the following: - identification of the sample; - sampling method: - sample preparation; - reference to the
40、 method used; - the test result: - any unusual features observed in the course of the determination; - any operations not specified in this European Standard or regarded as optional. OBSI 06-2000 BS EN 13299:2000 BSI 389 Chiswick High Road London w4 4AL STD-BSI BS EN 13277-ENGL 2000 W 1b24bb7 08513L
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