《ISO-1552-1976.pdf》由会员分享，可在线阅读，更多相关《ISO-1552-1976.pdf（8页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON METJYHAPOIWAR OPrAHH3AUMX ITO CTAHAPTASAUBA.ORGAN,SAT,ON ,NTERNAT,ONALE DE NC,RMAL,SAT,ON Liquid chlorine for industrial use - Method of sampling (for determining only the volumetric chlorine content) Chlore liquide ri usage indus
2、triel - Methode d khantillonnage (en we uniquement de la de termination du titre volumktrique en chlore) First edition - 1976-04-15 -_ . - “* yi x- f ._I 3, -._ _. ._-s * t 6-“ C. 2.: i. y, “i- .1;y CT - ,._ 1 ,_ : ;. 1 ._, _a x . -. . - .:_ -_ .I . . . . . iii UDC 661.41 : 543.05 Ref. No. IS0 1552-
3、1976 (E) (D s ; N Descriptors : liquefied gases, chlorine, sampling, determination of content, volumetric analysis. s 0 II Price based on 6 pages i Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for R
4、esale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 Member Bodies). The work of developing International Standards is car
5、ried out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Dra
6、ft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. Prior to 1972, the results of the work of the Technical Committees were published as IS0 Recommendations; these docum
7、ents are now in the process of being trans- formed into International Standards. As part of this process, Technical Committee lSO/TC47 has reviewed IS0 Recommendation R 1552 and found it technically suitable for transformation. International Standard IS0 1552 therefore replaces IS0 Recommendation R
8、1552-1970 to which it is technically identical. IS0 Recommendation R 1552 was approved by the Member Bodies of the following countries : Austria Belgium Colombia Cuba Czechoslovakia Egypt, Arab Rep. of France Germany Hungary India I ran Israel Italy Korea, Rep. of Netherlands New Zealand Poland Port
9、ugal Romania South Africa, Rep. of Spain Switzerland Thailand Turkey United Kingdom U.S.S.R. No Member Body expressed disapproval of the Recommendation. No Member Body disapproved the transformation of ISO/R 1552 into an Inter- national Standard. 0 International Organization for Standardization, 197
10、6 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDA
11、RD IS0 1552-1976 (E) Liquid chlorine for industrial use - Method of sampling (for determining only the volumetric chlorine content) 1 SCOPE 4 PRINCIPLE This International Standard specifies a method of sampling A check that the equipment used is gas-tight. liquid chlorine for industrial use, with a
12、view to determining only the volumetric chlorine content. The collection of two representative samples in steel bottles during the filling of the delivery tank-wagon. One bottle is intended for the customer and the other is retained by the manufacturer in case an analysis is required for checking pu
13、rposes. 2 FIELD OF APPLICATION The method is applicable to the sampling of liquid chlorine for industrial use, with a view to determining only the volumetric chlorine content, when an agreement has previously been reached between the interested parties (removal of two representative samples during f
14、illing of the tank-wagon at the manufacturer s premises). It cannot be applied when it is intended to determine the water content. 2.1 Special case 5 APPARATUS The installation, which is shown in diagrammatic form in figure 4, consists of 5.1 Liquid chlorine bottle, made of steel, having a usable ca
15、pacity of from 1 to 10 I (see example in figure 1) and provided with a two-valve head having two dipping tubes (see example in figure 2), the shorter tube having a length so calculated as to keep below its lower end a residual volume of 12 to 15 % of the total capacity of the bottle. 5.2 Connection
16、pipes, of copper or steel, having a diameter of approximately IO mm and suitable needle valves of stainless steel. Method to be applied when no agreement has been made, and it is therefore a question of taking one or more representative samples (during emptying of the tank-wagon at the customer s pr
17、emises), with a view to determining only the volumetric chlorine content. 6 PROCEDURE 3 WARNING The sampling of liquid chlorine involves dangerous and difficult handling operations which can only be carried out by specialist staff using suitable equipment and operating in the open air or in well-ven
18、tilated places. Direct sampling from the glass containers used for the titration processes (gas burettes in the case of gaseous chlorine, and insulated vessels in the case of liquid chlorine) seems at first sight to be a satisfactory solution, since it prevents any pollution of the sample resulting
19、from intermediate operations. 6.1 Preliminary operations Clean the piping and valves of the installation with a jet of steam and dry them with dry air. Clean the liquid chlorine bottle and bottle head in the same way with a jet of steam and dry them with dry air. Fix the head on the bottle after mak
20、ing a reference mark on the outer wall to indicate the lower level of the shorter tube, and weigh the complete assembly. Check that there is no blockage in the plunger tubes. For this purpose, connect the bottle as indicated in figure 3 to a vacuum pump and open carefully and progressively both valv
21、es. The rapid passage of air observed in the sulphuric acid bubbler indicates the absence of any blockage. However, it can only rarely be carried out under sufficiently safe conditions, since the testing laboratory is not usually near the place where the sample is taken. For this reason, it is recom
22、mended that the representative sample be taken in the small steel bottles which are commonly available, and the use of which entails no deterioration of the product. Then check that the valves are functioning correctly by closing them alternately. The passage of air should then cease. 1 Copyright In
23、ternational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1552-1976 (E) 6.2 Sampling liquid chlorine during filli
24、ng of the If this value is exceeded, eliminate the excess liquid by tank-wagon inclining the head of the bottle downward. 6.2.1 Connection of the bottle and verification of gas-tightness. Once the liquid chlorine bottle has been cleaned, weighed and checked, connect it to the installation illustrate
25、d in figure 4, with all the valves closed. Slightly open the valve A connecting the storage tank containing the liquid chlorine to the tank-wagon. Open valves 1 and 4 in succession and check the gas-tightness of the bottle connections with a little soapy water (do not use ammonium hydroxide). Close
26、valves 1 and 4. 6.2.2 Filling of the bottle Successively open valves 2 and 3 and then 1 and 4 in such a way that the liquid chlorine flows in the direction indicated by the arrows in figure 4. Regulate the flow by operating valve 1 so as to take two representative samples over the whole period of fi
27、lling of the tank-wagon. Operate in such a way that the flow can still continue for at least 10 min after the level has reached the lowest point of the shorter plunger tube, which has been previously marked as specified in 6.1. Finally, a compressed gaseous phase is thus left in the top part of the
28、bottle, which prevents complete filling of the latter. When these conditions have been fulfilled, close valves 1, 2, 3 and 4 in succession and immediately open valves 5 and 6. 6.2.3 Disconnection of the bottle Allow the chlorine contained in the piping to evaporate. If necessary, heat the pipes with
29、 a jet of steam. Then close valves 5 and 6 and disconnect the bottle. 6.3 Checking the filling by weighing the bottle Wipe away the condensation water on the outer wall and then weigh the bottle. The mass of chlorine taken, expressed in kilograms, is given by the formula : where mo is the mass, in k
30、ilograms, of the empty bottle; m, is the mass, in kilograms, of the bottle after filling. This difference shall be not greater than the product V x I,25 (to be labelled on each bottle) where V is the total capacity, in litres, of the bottle (previously measured by weighing with water at 20 “C). 7 SP
31、ECIAL CASE The taking of one or more representative samples during unloading of a tank-wagon, in the absence of a previous agreement between the interested parties. 7.1 Warning See clause 3. 7.2 Principle A check that the equipment is gas-tight. Purging of the tank-wagon. The collection of one or mo
32、re representative samples in steel bottles during emptying of the tank-wagon. 7.3 Apparatus See clause 5, but in this case the installation is diagrammatically illustrated in figure 5. 7.4 Procedure 7.4.1 Purging of the tank-wagon Allow approximately 100 kg of liquid chlorine to flow from the tank-w
33、agon towards the liquid chlorine tank, by slightly opening the valve A, and then close it again. 7.4.2 Preliminary operations See 6.1. 7.4.3 Collection of a sample 7.4.3.1 CONNECTION OF THE BOTTLE AND VERIFICATION OF GAS-TIGHTNESS Connect the liquid chlorine bottle which has just been cleaned, weigh
34、ed and checked, to the installation as illustrated in figure 5, with all the valves closed. Slightly open valve A connecting the tank-wagon to the liquid chlorine tank. Open valves 4 and 1 in succession and check the gas-tightness of the bottle connections with a little soapy water (do not use ammon
35、ium hydroxide). Close valves 4 and 1. 7.4.3.2 FILLING THE BOTTLE Successively open valves 3 and 2 and then 4 and 1 so that the liquid chlorine flows in the direction indicated by the arrows in figure 5. Regulate the flow by operating valve 4. 2 Copyright International Organization for Standardizatio
36、n Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1552-1976 (E) When the level reaches the point below the shorter plunger tube which has been previ
37、ously marked as specified in 7.4.2, let the liquid chlorine continue to flow for at least IO min. Finally, a compressed gaseous phase thus remains in the upper part of the bottle, which prevents total filling. When these conditions have been fulfilled, close valves 4,3, 2 and 1 in succession and imm
38、ediately open valves 5 and 6. 7.4.3.3 DISCONNECTION OF THE BOTTLE See 6.2.3. 7.4.4 Checking the filling by weighing the bottle See 6.3. 8 SAMPLING REPORT The sampling report shall include the following particulars : a) the reference of the method used; b) any unusual features noted during the sampli
39、ng; c) any operation not included in this International Standard or regarded as optional. See figure 2 Steel bottle - (dimensions according to capacity : (I to 10 I) FIGURE 1 - Liquid chlorine bottle 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Li
40、censee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO1552-1976 (E) Dimensions in millimetres ,120,8/22,8 14 G/l” I w/l A A 2 coaxial unconnected holes 2 plugs and 2 tubes solidly attached by weld
41、ing, the head silvered all over l% .- ” ti : VI r G i q5 23,4/25,8 Taper 3125 5 26,4/28,8 14 11 ” FIGURE 2 - Head of liquid chlorine bottle 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale,
42、 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1552-1976 (E) Air drawn in e LJ Liquid chlorine bottle FIGURE 3 - Checking of liquid chlorine bottle before the removal of the sample - Diagram of assembly Storage tank containing the liquid chlorine L
43、 5 To the tank-wagon FIGURE 4 T To degassing unit (hood or scrubber containing sodium hydroxide) Liquid chlorine bottle Removal of a sample of liquid chlorine during the filling of a tank-wagon - Diagram of the installation 5 Copyright International Organization for Standardization Provided by IHS u
44、nder license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1552-1976 (E) Liquid chlorine tank A L 5 1 I 6 8 1 - 3 t r 1 t To degassing unit (hood or scrubber contaimng sodium h
45、ydroxide) Liquid chlorine bottle FIGURE 5 - Removal of a sample of liquid chlorine during the draining of a tank-wagon - Installation diagram ANNEX IS0 PUBLICATIONS RELATIN& TO LIQUID CHLORINE FOR INDUSTRIAL USE IS0 1552 - Method of sampling (for determining only the volumetric chlorine content). IS
46、0 2120 - Determination of the content of chlorine by volume in the vaporized product. IS0 2121 - Determination of water content - Gravimetric method. +, IS.9 2202 -.,Determination of water content using an electrolytic analyser. : p c . s- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:41:23 MDTNo reproduction or networking permitted without license from IHS -,-,-