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1、 Reference number ISO 15859-12:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 15859-12 First edition 2004-06-01 Space systems Fluid characteristics, sampling test methods Part 12: Carbon dioxide Systmes spatiaux Caractristiques, chantillonnage et mthodes dessai des fluides Partie 12: Dioxyde de carbone
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5、ss given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs
6、member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reserved ISO 15859-12:2004(E) ISO 2004 All rights reserved iii Fore
7、word ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a techn
8、ical committee has been established 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
9、electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to
10、 the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for
11、identifying any or all such patent rights. ISO 15859-12 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. ISO 15859 consists of the following parts, under the general title Space systems Fluid characteristics, sampling test
12、methods: Part 1: Oxygen Part 2: Hydrogen Part 3: Nitrogen Part 4: Helium Part 5: Nitrogen tetroxide propellants Part 6: Monomethylhydrazine propellant Part 7: Hydrazine propellant Part 8: Kerosine propellant Part 9: Argon Part 10: Water Part 11: Ammonia Part 12: Carbon dioxide Part 13: Breathing air
13、 ISO 15859-12:2004(E) iv ISO 2004 All rights reserved Introduction Fluid operations at a spaceport or launch site may involve a number of operators and supplier/customer interfaces, from the fluid production plant to the delivery to the launch vehicle or spacecraft. The purpose of ISO 15859 is to es
14、tablish uniform requirements for the components, sampling and test methods of fluids used in the servicing of launch vehicles, spacecraft and ground support equipment. The fluid composition limits specified are intended to define the purity and impurity limits of the fluid for loading into the launc
15、h vehicle or spacecraft. The fluid sampling and test methods are intended to be applied by any operator. The fluid sampling and test methods are acceptable methods for verification of the fluid composition limits. INTERNATIONAL STANDARD ISO 15859-12:2004(E) ISO 2004 All rights reserved 1 Space syste
16、ms Fluid characteristics, sampling test methods Part 12: Carbon dioxide 1 Scope This part of ISO 15859 specifies limits for the composition of carbon dioxide (CO2) and establishes the sampling and test requirements applicable for the verification of the carbon dioxide composition. This part of ISO 1
17、5859 is applicable to composition, sampling, and test methods for carbon dioxide intended for purging and pressurization in both space systems flight hardware and ground support facilities, systems, and equipment. This part of ISO 15859 may be applied to carbon dioxide influents. Carbon dioxide may
18、be of the gaseous or liquid type. This part of ISO 15859 is applicable to any sampling operation required to ensure that, when the fluid enters the launch vehicle or spacecraft, the fluid composition complies with the limits provided hereafter or with any technical specification agreed to for a part
19、icular use. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9000, Qual
20、ity management systems Fundamentals and vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 9000 and the following apply. 3.1 verification test analysis performed on the fluid in the container, or a sample thereof, which is representative of t
21、he supply, permitting the verification of fluid composition limits 4 Chemical composition Unless otherwise provided in an applicable technical specification, the composition of carbon dioxide delivered to the flight vehicle interface shall be in accordance with the limits given in Table 1 when teste
22、d in accordance with the applicable test methods. -,-,- ISO 15859-12:2004(E) 2 ISO 2004 All rights reserved Table 1 Composition limits Component Limit Carbon dioxide purity volume fraction, %, min.99 Water, at 21 C and 760 mm Hg mg per litre of gas, max.0,092 5 Procurement The carbon dioxide specifi
23、ed in Clause 1 should be procured in accordance with an applicable national standard. 6 Fluid sampling CAUTION Carbon dioxide is an asphyxiant. Care should be taken to prevent high concentrations of gaseous carbon dioxide in confined spaces. 6.1 Plan In order to ensure that the fluid composition com
24、plies with the limits specified in this part of ISO 15859, a fluid sampling plan should be established by all the involved operators, from the production to the space vehicle interface, and approved by the final user. Sampling activities and test methods shall comply with all safety regulations and
25、rules applicable to that task. This plan shall specify the sampling points, the sampling procedures, the sampling frequency, the sample size, the number of samples, the test methods, and the responsibilities of any involved operator. 6.2 Responsibility for sampling Unless otherwise provided in an ap
26、plicable technical specification, the carbon dioxide delivered to the flight vehicle interface shall be sampled and verified by the supplier responsible for providing the carbon dioxide to the flight vehicle. The supplier may use his/her or any other resources suitable for the performance of the ver
27、ification tests specified herein unless otherwise directed by the customer. 6.3 Sampling points Unless otherwise specified, sampling shall be conducted at the fluid storage site or the flight vehicle interface. 6.4 Sampling frequency Sampling shall be performed annually or in accordance with a time
28、agreed upon by the supplier and the customer. ISO 15859-12:2004(E) ISO 2004 All rights reserved 3 6.5 Sample size The quantity in a single sample container shall be sufficient to perform the analysis for the limiting characteristics. If a single sample does not contain a sufficient quantity to perfo
29、rm all of the analyses for the required quality verification test, additional samples shall be taken under similar conditions. 6.6 Number of samples The number of samples shall be in accordance with one of the following: a) one sample per storage container; b) any number of samples agreed upon by th
30、e supplier and the customer. 6.7 Storage container Unless otherwise provided by the applicable sampling plan, the fluid storage container shall not be refilled after the sample is taken. 6.8 Gaseous samples Gaseous samples shall be a typical specimen of the carbon dioxide supply. Samples shall be ob
31、tained in accordance with one of the following. a) By filling the sample container and storage containers at the same time, on the same manifold, and under the same conditions and with the same procedures. b) By withdrawing a sample from the supply container through a suitable connection into the sa
32、mple container. No pressure regulator shall be used between the supply and the sample containers. (Suitable valves are permissible.) For safety reasons, the sample container and sampling system shall have a rated service pressure at least equal to the pressure in the supply container. c) By connecti
33、ng the container being sampled directly to the analytical equipment using suitable pressure regulation to prevent over-pressurizing this equipment. 6.9 Rejection When any sample of the fluid tested in accordance with Clause 7 fails to conform to the requirements specified herein, the fluid represent
34、ed by the sample shall be rejected. Disposal of the rejected fluid shall be specified by the customer. 7 Test methods 7.1 General The supplier will ensure, by standard practice, the quality level of carbon dioxide. If required, alternate test methods are described in 7.3 to 7.4. Other test methods n
35、ot listed in this part of ISO 15859 are acceptable if agreed upon between the supplier and the customer. These tests are a single analysis or a series of analyses performed on the fluid to ensure the reliability of the storage facility to supply the required quality level. This can be verified by an
36、alysis of representative samples of the fluid from the facility at appropriate intervals as agreed upon between supplier and the customer. Tests may be performed by the supplier or by a laboratory agreed upon between the supplier and the customer. The analytical requirements for the tests shall incl
37、ude the determination of all limiting characteristics of carbon dioxide. ISO 15859-12:2004(E) 4 ISO 2004 All rights reserved 7.2 Parameters of analysis The parameters for analytical techniques contained in 7.3 and 7.4 are the following: a) purity shall be expressed as a percentage by volume (volume
38、fraction, %) unless otherwise noted; b) calibration gas standards containing the applicable gaseous components may be required to calibrate the analytical instruments used to determine the limiting characteristic levels of fluid; c) if required by the customer, the accuracy of the measuring equipmen
39、t used in preparing these standards shall be traceable to an established institute for standards; d) analytical equipment shall be operated in accordance with the manufacturers instructions. 7.3 Carbon dioxide purity The carbon dioxide purity shall be determined by one of the following procedures. a
40、) By a volumetric absorption (Orsat type) gas analysis apparatus. b) By a gas chromatograph capable of separating and determining the components of interest. c) By determining the amount of the aggregate impurities using other acceptable methods. The purity of carbon dioxide is the value obtained wh
41、en the quantity of aggregate impurities, expressed as a volume fraction (%), is subtracted from 100. 7.4 Water content The water content shall be determined by one of the following procedures. a) By an apparatus employing a detector tube filled with a colour-reactive chemical. The degree of accuracy
42、 is dependent on the precision of the measurements and the analytical bias of the tube. b) By an electrolytic hygrometer having an indicator graduated in cubic centimetres per cubic metre within a range which is not greater than 10 times the specified maximum water content. c) By a dew-point analyse
43、r in which the temperature of a viewed surface is measured at the time water first begins to form. d) By a piezoelectric sorption hygrometer, of which the accuracy of analysis shall be 0,1 cm3/m3 or 5 % of the reading, whichever is greater. e) By a metal-oxide-capacitor-equipped analyser within a range which is not greater than 10 times the specific maximum water content. -,-,- -,-,- ISO 15859-12:2004(E) ICS 49.140 Price based on 4 pages ISO 2004 All rights reserved