BS 5551-2 3-1978 Fertilizers - Sampling - Sampling from a conveyor by stopping the belt [reference method]《肥料 第2部分 取样 第3节 停(止输送)带(进行)取样(比对法)》.pdf

1、BRITISH STANDARD BS 5551-2.3: 1978 ISO 3963:1977 Incorporating Amendment No. 1 Fertilizers Part 2: Sampling Section 2.3: Sampling from a conveyor by stopping the belt reference method ISO title: Fertilizers Sampling from a conveyor by stopping the belt UDC 631.8:543.05:621.867.2BS5551-2.3:1978 This

2、British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Executive Boardon 31January1978 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/37 Draft for comment 75/53678 D

3、C ISBN 0 580 09989 X Cooperating organizations The Chemicals Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Fatty Acid Distillers British

4、Tar Industry Association Chemical Industries Association* Chemical Society, Analytical Division Department of Health and Social Security Department of Industry, Chemicals and Textiles Division Department of Industry, Laboratory of the Government Chemist* Fertiliser Manufacturers Association Ltd.* Hy

5、drocarbon Solvents Association Institution of Gas Engineers Ministry of Agriculture, Fisheries and Food* Ministry of Defence National Sulphuric Acid Association Paintmakers Association of Great Britain Ltd. Royal Institute of Public Health and Hygiene Soap and Detergent Industry Association Standard

6、ization of Tar Products Tests Committee The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Agrochemicals Association Institute of Trading Standards Admin

7、istration Amendments issued since publication Amd. No. Date of issue Comments 6962 February 1992 Indicated by a sideline in the marginBS5551-2.3:1978 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Re

8、ferences 1 3 Principle 1 4 Apparatus 1 5 Procedure 1 6 Sampling report 1 Publications referred to Inside back coverBS5551-2.3:1978 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Chemicals Standards Committee in order to standardize terminology and

9、 labelling, sampling and methods of physical and chemical testing for fertilizers. For some years the United Kingdom has participated in the standardization of methods of sampling fertilizers through Subcommittee 2, Sampling, of Technical Committee134, Fertilizers and soil conditioners, of the Inter

10、national Organization for Standardization (ISO). As international agreement is reached on the methods, it is proposed to publish them as Sections of BS5551. The standard is to be published in4 Parts, each Part being subdivided into Sections and, where appropriate, Subsections. The four main Parts ar

11、e: Part 1: Terminology and labelling; Part 2: Sampling; Part 3: Physical properties; Part 4: Chemical analysis. This Section of Part2 is identical with ISO3963 “Fertilizers Sampling from a conveyor by stopping the belt”. Terminology and conventions. The text of the International Standard has been ac

12、cepted as suitable for publication, without deviation, as a British Standard. Certain terminology is used, however, that is not identical with that used in British Standards. Attention is therefore drawn to the following. Where the words “International Standard” relating to this publication, appear,

13、 they should be interpreted as “British Standard”. Cross references. For each of the following references to other International Standards that are given in the text, there is an equivalent British Standard; these are as listed below: A British Standard does not purport to include all the necessary

14、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. International Standard Corresponding British Standard BS 5551 Fertilizers Part 2 Sampling ISO 5306:1983 a

15、Section 2.2:1984 Presentation of sampling reports (Identical) ISO 8634:1991 b Section 2.9:1991 Sampling plan for the evaluation of a large delivery of solid fertilizer (Identical) a “ISO . Fertilizers Sampling report” was published in1983 as ISO5306 “Fertilizers Presentation of sampling reports”. b

16、“ISO . Fertilizers Sampling” was published in1991 as ISO8634 “Solid fertilizers Sampling plan for the evaluation of a large delivery”. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard ha

17、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5551-2.3:1978 BSI 10-1999 1 0 Introduction Taking a representative sample from a consignment of fertilizer by sampling from a conveyor by stopping t

18、he belt is time consuming and interrupts the loading or unloading process considerably. The method should be used only where other methods, such as automatic sampling or scoop sampling from a free fall, are impossible, or as a reference method to assess the accuracy of other techniques. The procedur

19、e given applies to each increment to be taken to form the final sample. The size of each increment, the number of increments or the frequency of sampling is found by reference to ISO . . . SAFETY The sampling method involves contact with machinery which is normally in motion. Safety precautions must

20、 be such that there is no possibility of the conveyor starting up while the increments are being taken. An override start/stop button should be provided at the point of sampling. The sampler should be able to reach the whole cross-section of the belt without undue physical strain. The position of sa

21、mpling should be made as convenient as possible, for example by using a suitable platform. 1 Scope and field of application This International Standard specifies a reference method for sampling all solid fertilizers transported on a conveyor belt from the place of manufacture or storage to some othe

22、r location. 2 References ISO . . ., Fertilizers Sampling 1) . ISO . . ., Fertilizers Sampling report 1) . 3 Principle Stopping of the belt conveying the fertilizer. Insertion of two parallel boards or metal sheets vertically down into and at right angles to the stream of fertilizer and to the axis o

23、f the conveyor belt. Removal of the material between the boards or sheets. 4 Apparatus Two parallel boards or metal sheets shaped to the characteristics of the trough of the belt, sufficiently long to project beyond the sides of the belt by500mm and sufficiently wide for the upper edge to be at leas

24、t50mm above the top of the fertilizer on the belt. It is recommended that a metal frame be made to carry the boards or metal sheets. This frame can then be placed across the belt in a single operation. Failing this, two marks should be made on the supporting structure on each side of the belt so tha

25、t the boards or metal sheets can be inserted in the same places each time. 5 Procedure Care must be exercised when samples are being taken from inclined belts. The boards shall, in these cases, be inserted rapidly and at right angles to the stream to avoid backflow. Select a suitable position on the

26、 conveyor belt where the fertilizer is well spread out and the stream stabilized, at least1m from the feed to the conveyor; stop the belt. Do not take a sample if there is a small feed at that time or if the flow has only just started or is just finishing. Once the belt has stopped, insert the two b

27、oards or metal sheets vertically down into the stream of fertilizer and at a sufficient distance apart to give an increment larger than the minimum mass required according to ISO . . . Push the boards gently down until they are in contact with the belt across the whole section. Any fertilizer obstru

28、cting the insertion of the boards shall be pushed: a) in the case of the downstream board, into the sample; b) in the case of the upstream board, out of the sample. As quickly as possible, completely remove the material between the two boards into a suitable air-tight container. Remove the boards or

29、 metal sheets and re-start the conveyor. Make sure that nothing has been left on the belt which could cause damage further down the line. Repeat the process for each increment, the number or frequency of the increments being decided by the sampling scheme. 6 Sampling report The sampling report shall

30、 follow the provisions of ISO . . . NOTEUntil this is published the following particulars shall be included: a) all information necessary for the complete identification of the sample; b) the method used, making reference to this International Standard; c) the sampling conditions; d) any operations

31、not specified in this International Standard or regarded as optional, as well as any factors likely to have influenced the results. 1) In preparation.2 blankBS5551-2.3:1978 BSI 10-1999 Publications referred to See national forewordBS 5551-2.3: 1978 ISO 3963:1977 BSI 389 Chiswick High Road London W4

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