BS-5711-2-1979 ISO-2096-1972.pdf
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1、BRITISH STANDARD BS 5711-2: 1979 ISO 2096:1972 Methods of Sampling and test for glycerol Part 2: Methods of sampling ISO title: Glycerols for industrial use Methods of sampling NOTEIt is recommended that this Part of BS 5711 be read in conjunction with the general information given in BS 5711-0”Gene
2、ral introduction”, issued separately. UDC 661.188.1:547.426.1:543.05 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-2:1979 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was pub
3、lished under the authority of the Executive Board and comes into effect on 30 November 1979 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/6 Draft for comment 75/53579 DC ISBN 0 580 10983 6 National foreword This Part of BS 5711 is identical wit
4、h ISO 2096 “Glycerols for industrial use Methods of sampling”. 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 fr
5、om legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, 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 amendm
6、ent table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-2:1979 BSI 12-1999i Contents Page National forewordInside front cover 1Scope and f
7、ield of application1 2General principles1 3Particular precautions1 4Methods of sampling glycerols during filling1 5Method of sampling glycerols in drums2 6Methods of sampling glycerols in tanks3 7Sampling report4 Figure 1 Examples of tapping sampler5 Figure 2 Example of sampling tube6 Figure 3 Examp
8、le of open-ended cylindrical sampler7 Figure 4 Example of weighted bottle for sampling from tanks8 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na,
9、 Mon Dec 04 15:01:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-2:1979 BSI 12-19991 1 Scope and field of application This International Standard describes methods for sampling quantities of glycerol, either crude or refined, for industrial use, in the course of filling (see section 4), or al
10、ready contained in drums (see section 5) or in transportable or fixed tanks (see section 6). 2 General principles 2.1 The preparation of a representative sample presents particular difficulties owing to the frequent heterogeneity of the lots. This can lead either to sedimentation of the solids in su
11、spension in the case of crude glycerols, or the stratification in layers of different densities in the course of storage, particularly if the glycerol has frozen after filling into drums or tanks and has then thawed. 2.2 It is consequently recommended to adopt, as far as possible, a procedure of sam
12、pling during filling (section 4) or, at least, to carry out the sampling of the lots immediately after this operation, while the product is still homogeneous. 2.3 If glycerol that has been stored for some time is to be sampled, one of the methods described in this International Standard shall be cho
13、sen, according to the container in which the product has been stored and the details supplied as to its condition by several samples taken from different locations. 2.4 It is customary to divide the composite sample into at least three portions, each being stoppered and sealed by the sampler. One po
14、rtion is for the purchaser, one for the vendor and one is kept for an independent analysis in case of dispute. 3 Particular precautions 3.1 In view of the very hygroscopic nature of glycerol, it is essential that samples shall at all times be protected from humidity and humid air. The containers use
15、d for mixing and storage shall be airtight and kept closed between filling and between the taking of various samples. As far as possible, sampling shall be carried out under cover, the containers particularly being protected from rain and all other accidental pollution. 3.2 The laboratory samples sh
16、all be poured into flasks of chemically resistant glass closed with ground glass stoppers. In certain cases these flasks may be closed with a screw cap closure having a polyethylene or aluminium liner. The flasks intended for laboratories shall be sealed by the responsible sampler with the aid of se
17、aling wax. 3.3 In the case of samples containing a deposit or suspended material the containers shall be filled to only two-thirds of their capacity in order to aid mixing. Otherwise the containers shall be completely filled. 3.4 All the apparatus and containers shall be clean and dry at the time of
18、 use. 4 Methods of sampling glycerols during filling 4.1 Intermittent sampling method 4.1.1 Principle Successive samplings, at regular intervals, of equal quantities throughout filling. Mixing of these successive samples, homogenization and then taking the laboratory samples. 4.1.2 Apparatus 4.1.2.1
19、 Sampling can, with handle, capacity 300 to 500 ml, of brass or, for refined glycerols, of stainless steel. 4.1.2.2 Cylindrical container, of suitable capacity, of the same material as the can (4.1.2.1) or, preferably, of glass and fitted with a lid making it airtight. This container is used for hol
20、ding and mixing the successive samples taken. 4.1.3 Procedure Determine the number of samples to be taken and the time interval between successive samplings, according to the quantity of product and the rate of flow in filling. Take the product at the discharge end of the filling pipe by means of th
21、e can (4.1.2.1), spacing the samplings as uniformly as possible. Before each sampling rinse the can (4.1.2.1), after it has been inverted and allowed to drain, with the glycerol to be sampled. Place the successive samples together in the container (4.1.2.2), keeping it closed between each addition.
22、Mix the whole sample rapidly with the aid of a stainless steel palette knife or, preferably, by rotating the closed container on its side, about its axis. Take the laboratory samples and immediately bottle them in quantities of about 500 g, taking the precautions described in 3.2, 3.3 and 3.4. 4.2 C
23、ontinuous sampling method 4.2.1 Principle and field of application Taking an aliquot part by allowing a constant proportion of the product to flow through a special device fitted to the filling pipe. Mixing and taking the laboratory samples. This procedure is applicable only to glycerols free from m
24、aterials in suspension. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:01:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5711-2:1979 2 BSI 12-1999 4.2.2 Apparatus 4.2.2.1 Stainless steel continuous tapping sampler comprising the following parts: a) tubular element bent at 90, or bevelle
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