00617424 PDF BRITISH STANDARD BS EN 1237 1995 Fertilizers — Determination of bulk density (tapped) The European Standard EN 1237 1995 has the status of a British Standard ICS 65 080 Confirmed August 2[.]
BRITISH STANDARD BS EN 1237:1995 Fertilizers — Determination of bulk density (tapped) The European Standard EN 1237:1995 has the status of a British Standard Confirmed August 2010 ICS 65.080 BS EN 1237:1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CII/37, Fertilizers and related chemicals, upon which the following bodies were represented: Association of Public Analysts British Aggregate Construction Materials Industries British Coal Corporation Chemical Industries’ Association Consumers’ Association Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd Horticultural Trades Association Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food Water Services Association of England 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 December 1995 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CII/37 Draft for comment 94/503972 DC ISBN 580 24906 Amendments issued since publication Amd No Date Comments BS EN 1237:1995 Contents Committees responsible National foreword Foreword Introduction Scope Normative references Definition Preparation of test sample Method — Machine-tapping method Expression of results Test report Annex ZA (informative) Bibliography Figure — Apparatus for the determination of bulk density (tapped) by machine tapping List of references © BSI 11-1999 Page Inside front cover ii 3 3 3 4 Inside back cover i BS EN 1237:1995 National foreword This British Standard has been prepared by Technical Committee CII/37 and is the English language version of EN 1237:1995 Fertilizers — Determination of bulk density (tapped) published by the European Committee for Standardization (CEN) It supersedes BS 5551-3.2:1993, which is now withdrawn It was derived by CEN from ISO 5311:1992 published by the International Organization for Standardization (ISO) Cross reference Publication referred to Corresponding British Standard ISO 3944:1992 BS EN 1236:1995 Fertilizers — Determination of bulk density (loose) A British Standard does not purport to include all the necessary provisions of a contract 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, pages i and ii, the EN title page, pages to 6, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 11-1999 EUROPEAN STANDARD EN 1237 NORME EUROPÉENNE June 1995 EUROPÄISCHE NORM ICS 65.080 Descriptors: Fertilizers, tests, determination, bulk density, density measurement English version Fertilizers — Determination of bulk density (tapped) (ISO 5311:1992 modified) Engrais — Détermination de la masse volumique après tassement (ISO 5311:1992 modifiée) Düngemittel — Bestimmung der Rütteldichte (ISO 5311:1992 modifiziert) This European Standard was approved by CEN on 1994-12-04 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such 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 other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref No EN 1237:1995 E EN 1237:1995 Foreword The text of the International Standard from ISO/TC 134 Fertilizers and soil conditioners, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 260, Fertilizers and liming materials This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995 According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Endorsement notice The text of the International Standard ISO 5311:1992 was approved by CEN as a European Standard with agreed common modifications as given below This European Standard is based on ISO 5311:1992 Whereas the scope of ISO 5311 covers two methods: — the machine-tapping method (method 1) — the hand-tapping method (method 2) The scope of this European Standard comprises the text of ISO 5311:1992 amended by the deletion of the hand-tapping method (method 2, clause 6) and the following minor amendments: — in clause Scope of ISO 5311, the applicability is limited to dry fertilizers only This requirement has been amended to free-flowing fertilizers Furthermore, a limit for particles exceeding mm in diameter has been set at 20 %; — the bulk density (tapped) is expressed in grams per cubic centimetre (g/cm3) in ISO 5311; in this European Standard it is expressed in kilograms per cubic metre (kg/m3); — the normative references to International Standards ISO 7742:1988 and ISO 8358:1991 concerning methods of sampling and sample preparation have been deleted and the method used has to be indicated in the test report; — an informative Annex ZA Bibliography has been added The common modifications have been inserted in the text of the reference document and are indicated by a sideline in the margin © BSI 11-1999 EN 1237:1995 Introduction Preparation of test sample The bulk densities (loose and tapped) of a fertilizer provide information relative to the required size of packaging materials, store-houses, stock-rooms, etc Generally, the bulk density (tapped) is up to 10 % greater than the bulk density (loose), and sometimes it may exceed this value Both bulk densities depend on the actual density, surface form and particle size of the fertilizers The bulk density (loose) can be used to calculate the maximum volume of a given weight of fertilizer which may be expected in practice The actual volume occupied by a given weight of fertilizer will normally be within the range calculated from the bulk density (loose) and the bulk density (tapped) Prepare the test sample by appropriate methods, ensuring that the sample is sufficient to carry out two separate determinations Scope This International Standard specifies a method for the determination of the bulk density (tapped) of solid fertilizers, except powder fertilizers The method is applicable to free-flowing fertilizers The method is not suitable for materials which contain more than 20 % by mass of particles exceeding mm in diameter Annex ZA lists the bibliography Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard At the time of publication, the editions indicated were valid All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below Members of IEC and ISO maintain registers of currently valid International Standards ISO 3944:1992, Fertilizers — Determination of bulk density (loose)1) Definition For the purposes of this International Standard, the following definition applies 3.1 bulk density (tapped) of a fertilizer the mass per volume of a material tipped into a container and then compacted under clearly specified conditions the bulk density (tapped) is expressed in kilograms per cubic metre (kg/m3) 1) Technically Method — Machine-tapping method 5.1 Principle Pouring of the fertilizer from a specified funnel into a specified measuring cylinder of known volume, tapping by means of a tapping machine, and weighing of the contents of the cylinder 5.2 Apparatus 5.2.1 Balance, capable of weighing to the nearest g 5.2.2 Apparatus for determination of bulk density (loose), according to ISO 3944, with a collar of transparent plastic and a measuring-cylinder holder with guide clamp (see Figure 1) 5.2.3 Tapping machine, having a camshaft the cams of which lift the guide clamp, measuring-cylinder holder and measuring cylinder once per revolution The rotational frequency of the camshaft shall be (250 ± 15) revolutions min–1 (See Figure 1.) 5.2.4 Spatula, approximately 120 mm × 20 mm, or other suitable scraper 5.3 Procedure Pour into the closed funnel of the apparatus (5.2.2) a quantity of the fertilizer greater than that needed to fill the measuring cylinder Fully open the slide of the funnel so that the contents discharge into the measuring cylinder in s to 12 s If the fertilizer does not flow freely, keep the outlet clear by inserting a rod of mm to mm diameter into the opening Remove the measuring cylinder from its holder, slip on the plastic collar and add by hand a quantity of fertilizer such that, after tapping, the fertilizer still remains several centimetres above the top of the measuring cylinder Place the measuring cylinder firmly in its holder in the tapping machine, and tap 500 times Remove the measuring cylinder from the tapping machine, remove the collar, and scrape away the surplus fertilizer heaped on the measuring cylinder by means of the spatula (5.2.4) Weigh the contents of the measuring cylinder to the nearest g of the total mass identical with EN 1236 © BSI 11-1999 EN 1237:1995 Carry out two determinations, in rapid succession, on separate test portions taken from the same test sample Expression of results 6.1 Method of calculation and formula The bulk density (tapped), Ôt, of the fertilizer is given, in kilograms per cubic metre, by the equation Ôt = m V where m is the mass, in kilograms, of the test portion; V is the volume up to the brim, in cubic metres, of the measuring cylinder 6.2 Repeatability The difference between the results of two determinations, carried out in rapid succession by the same operator using the same apparatus, shall not exceed 10 kg/m3 Test report The test report shall include the following particulars: a) identification of the sample; b) reference to the method used; c) the result and the method of expression; d) any unusual features noted during the determination; e) any operation not included in this International Standard or regarded as optional; f) methods of sampling and sample preparation © BSI 11-1999 EN 1237:1995 Figure — Apparatus for the determination of bulk density (tapped) by machine tapping © BSI 11-1999 EN 1237:1995 Annex ZA (informative) Bibliography ISO 3944:1992, Fertilizers — Determination of bulk density (loose) ISO 3963:1977, Fertilizers — Sampling from a conveyor by stopping the belt ISO 7410:1983, Fertilizers and soil conditioners — Final samples — Practical arrangements ISO 7742:1988, Solid fertilizers — Reduction of samples ISO 8358:1991, Solid fertilizers — Preparation of samples for chemical and physical analysis EN 1236, Fertilizers — Determination of bulk density (loose) Pr EN 1482, Sampling of solid fertilizers © BSI 11-1999 BS EN 1237:1995 List of references See national foreword © BSI 11-1999 BS EN 1237:1995 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this 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