欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ISO 5308-1992 Solid fertilizers method of checking the performance of mechanical devices for sampling of product moving in bulk《固体肥料 流动散料的取样机械装置性能校验方法》.pdf

    • 资源ID:1254224       资源大小:511KB        全文页数:6页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ISO 5308-1992 Solid fertilizers method of checking the performance of mechanical devices for sampling of product moving in bulk《固体肥料 流动散料的取样机械装置性能校验方法》.pdf

    1、IS0 5308 92 4853903 0521372 511 I NTE RNAT I O NAL S TA N DAR D IS0 5308 First editior! 1992-1 2-01 Solid fertilizers - Method of checking the performance of mechanical devices for sampling of product moving in bulk Matires fertilisantes solides - Mthode de contrle des performances des appareils mca

    2、niques dchantillonnage du produit en vrac en mouvement Reference number IS0 5308:1992(E) IS0 5308 92 4853903 0523373 Y58 IS0 5308:1992(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparin

    3、g International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liai

    4、son with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicatio

    5、n as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 5308 was prepared by Technical Committee iSO/TC 134, Fertilizers and soil conditioners, Sub-Committee SC 2, Sam- pling. O IS0 1992 All rights reserved. No part of this pu

    6、blication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-1 21 1 Genve 20 . Switzerland Printed in Switzerl

    7、and II IS0 5308 92 = 451903 0523374 394 INTERNATIONAL STANDARD IS0 5308:1992(E) Solid fertilizers - Method of checking the performance of mechanical devices for sampling of product moving in bulk 1 Scope This International Standard specifies a method of checking the performance of mechanical devices

    8、 for sampling fertilizers moving in bulk by comparison of particle size distribution with that obtained by a refer- ence method. It is applicable to any form of mechanical sampling device installed at some point in a bulk-handling sys- tem, providing that either the fertilizer passes along a conveyo

    9、r belt, before or after the device, or it is sub- sequently packed in bags in order that a reference collection can be made. NOTE 1 Although the mechanical sampling may be used for the collection of samples for chemical analysis instead of or as well as for physical testing, any bias will be more ea

    10、sily and economically found by size analysis than by chemical analysis of the nutrients. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated

    11、 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 re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid Int

    12、ernational Standards. IS0 2602:1980, Statistical interpretation of test re- sults - Estimation of the mean - Confidence in terval. IS0 3301 :I 975, Statistical interpretation of data - Comparison of two means in the case of paired ob- servations. IS0 331 0-1 :I 990, Test sieves - Technical require-

    13、ments and testing - Part ?: Test sieves of metal wire cloth. IS0 3534: 1 977, Statistics - Vocabulary and symbols. IS0 3963:1977, fertilizers - Sampling from a con- veyor by stopping the belt. IS0 7742:1988, Solid fertilizers - Reduction of sam- ples. IS0 8397:1988, Solid fertilizers and soil condit

    14、ioners - Test sieving. 3 Principle Collection of two series of increments, one using a mechanical device and one using a reference method, from a quantity of fertilizer passing through a bulk- handling system, and comparison of the means and variances of the particle size distribution of the two sam

    15、ples. 4 Apparatus 4.1 quirements of IS0 7742. Rotary sample divider, complying with the re- 4.2 Sample containers 4.3 Set of sieves, complying with the requirements of IS0 3310-1, of nominal aperture sizes 4,OO mm, 3,35 mm, 2,80 mm, 2,36 mm, 2,OO mm, 1,40 mm, 1,00 mm and 0,50 mm. 1 IS0 5308 92 H 485

    16、1903 0523375 220 IS0 5308:1992(E) 4.4 Sieve-shaking machine 5 General conditions The method of test specified in this International Standard should be carried out using a granular fertilizer. The use of a blended product may introduce additional sources of variation. If only blended fertilizer is av

    17、ailable for this test, in- crements of at least 200 g shall be collected (see 6.1 .I 1. It may be necessary to check the variability of the product before carrying out this test method in order to decide whether to take more increments than are specified, or to be able to conduct the test over a sho

    18、rter period of time. A statistician should be con- sulted on the most efficient and economical method of carrying out such a check. The test shall be carried out while at least 20 t (and preferably not more than 100 t) of fertilizer passes through the mechanical sampling device. 6 Procedure 6.1 Coll

    19、ection of increments Carry out the operations described in 6.1.1 and 6.1.2 concurrently. 6.1.1 Using the mechanical sampling device under test, collect at least 50 increments of a suitable size1) and label them from Al to A50, etc. 6.1.2 Carry out one of the following reference col- lections. a) If

    20、the fertilizer is conveyed by a conveyor belt feeding to, or extracting from, the mechanical sampling device, collect the same number of in- crements as collected in accordance with 6.1 .I by stopping the conveyor belt as specified in IS0 3963. If possible, synchronize the taking of the increments b

    21、y the device under test with the taking of increments by the reference method, so that corresponding increments are taken from the same part of the fertilizer bed (see 7.2). For ex- ample, if the reference sample is taken after the sample taken by the mechanical sampling device, it may be possible t

    22、o see the gap in the fertilizer bed on the conveyor belt. b) Collect the same number of full bags as the num- ber of increments specified in 6.1.1, from the same tonnage of fertilizer, at intervals corre- sponding as closely as possible to the time- intervals at which increments are taken in accorda

    23、nce with 6.1 .I. Label the reference increments or bags R1 to R50, etc. If necescary, reduce the size of the increments, or the quantities of fertilizers taken in bags, to approximately the same size as those collected in 6.1 .I, by the method specified in IS0 7742. 6.2 Preparation of samples Combin

    24、e the increments into equal groups to give at least 10 individual samples taken by the same method (6.1.1 and 6.1.2). The groups shall be formed of con- secutive increments, for example Al to Ag, A6 to Mix each of the individual samples thoroughly, then, proceeding in accordance with IS0 7742 using

    25、the rotary sample divider (4.11, reduce each sample to a suitable mass (200 g to 250 g) for particle-size analy- sis. Alo, . . ., A46 to A50, etc. 6.3 Analysis of samples Carry out a particle-size analysis on each of the re- duced samples, obtained as described in 6.2, by the method described in IS0

    26、 8397 using four or five sieves from the set (4.31, chosen to suit the fertilizer used in the test. Use the same sieves for the analysis of each reduced sample. Record the percentages of fertilizer retained on each sieve and the percentage passing through the sieve with the smallest aperture. 7 Expr

    27、ession of results 7.1 General case where the increments taken by the two methods do not correspond exactly to each other For each series of n reduced samples, calculate the mean and the standard deviation for the percentage of fertilizer retained successively on each of the sieves and the percentage

    28、 passing through the sieve with the smallest aperture size used. For each successive test sieve, calculate the value of the statistic t by means of the formula I- where FA and sA are the mean and the standard devi- ation for the reduced samples ob- tained using the device (6.1.1); 1) Information on

    29、the minimum mass of an increment is given in ISODR 7553:1987, Fertilizers - Sampling - Minimum mass of increment to be taken to be representative of the total sampling unit. 2 IS0 5308 92 4853903 0523376 367 XR and sR are the mean and the standard devi- ation for the reduced samples ob- tained using

    30、 the reference method (6.1.2). Refer to the statistical tables in IS0 2602 for the sig- nificance of the values of t obtained with 2(n - 1) de- grees of freedom. 7.2 Special cases where the increments taken by the two methods correspond exactly to each other For each pair of reduced samples, calcula

    31、te the dif- ference between the percentages of fertilizer retained on each sieve in turn and the percentage passing through the sieve of smallest aperture size used. Cal- culate the mean d and the standard deviation Sd of these differences for each test sieve in turn and for the undersize fraction,

    32、and calculate the value of the statistic t by means of the formula tz- d Refer to the statistical tables in IS0 3301 for the sig- nificance of the values of t obtained with (n- 1) de- grees of freedom. 8 Interpretation of results The interpretation of the individual results depends on the precision

    33、that is both acceptable and practically feasible. It is to be expected that the most significant bias will be shown by the results for the percentages IS0 5308:1992(E) of fertilizer retained on the sieve of largest aperture size and passing through the sieve of smallest aper- ture size used for the

    34、test, and the least significant bias by the results for the intermediate sieves. A mechanical sampling device shall be rejected if any of the values of t for the percentages of fertilizer re- tained on the sieve of largest aperture size and the percentages of fertilizer passing through the sieve of

    35、smallest aperture size are significant at the 95 % confidence level. The device shall be accepted as being without bias if all the values of t are not significant at the 95 % con- fidence level. In other cases, e.g. where one of the values of t is significant at the 95 % confidence level, indicating

    36、 the possibility of bias, the tests should be repeated on a larger number of samples. NOTE 2 As tests of this sort, requiring larger numbers of samples, are tedious and costly to carry out, it is rec- ommended that a statistician be consulted before further tests are carried out. Additional informat

    37、ion on the performance of the tested device c$n be obtained by comparing the varl- ances si and sR obtained in 7.1 using the F-test as defined in IS0 3534. In the special case (7.21, si and si may be calculated in the normal way from the individual results. If a significantly larger variance is obta

    38、ined for the tested mechanical device than for the reference method, this implies that the device is not reliable. 3 IS0 5308 92 = 4853903 0523377 OT3 IS0 5308:1992(E) UDC 631.8:620.115.2 Descriptors: fertilizers, sampling, sampling equipment, tests, performance tests, grain size analysis Price based on 3 pages


    注意事项

    本文(ISO 5308-1992 Solid fertilizers method of checking the performance of mechanical devices for sampling of product moving in bulk《固体肥料 流动散料的取样机械装置性能校验方法》.pdf)为本站会员(visitstep340)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开