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1、a Date: 30 April 2007 Origin: International Latest date for receipt of comments: 31 July 2007 Project no.: 2006/00553 Responsible committee: ACE/68/-/1 Space systems and operations - Engineering Design production Interested committees: ACE/68 Title: Draft ISO 24638 Space systems Pressure components
2、and pressure system integration Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details bel
3、ow). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 July 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent
4、. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limite
5、d to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. British S
6、tandards on CD or Online are available from British Standards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-ref
7、erences The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-. Direct tel: 020 8996 7792 Responsible Committee Secretary: Mrs Sara Ansari (BSI) E-mail: sara.ansar
8、ibsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30146438 DC Licensed Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Co
9、py, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are invited and will assist in the preparation of the consequent standard. Comments submitted will be reviewed by the relevant BSI committee befo
10、re sending the consensus UK vote and comments to the international secretariat, which will then decide appropriate action on the draft and the comments received. If no comments are received to the contrary, then the UK will approve this draft. If the international standard is approved, it is possibl
11、e the text will be published as an identical British Standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate att
12、ention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 o
13、f Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting c
14、omments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figu
15、re/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connecti
16、on . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed
17、Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS
18、SUCH. IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. DRAFT
19、 INTERNATIONAL STANDARD ISO/DIS 24638 International Organization for Standardization, 2007 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ISO/TC 20/SC 14 Voting begins on: 2007-04-23 Secretariat: ANSI Voting terminates on: 2007-09-23 Space systems Pressur
20、e components and pressure system integration Systmes spatiaux Intgration des systmes et des composants sous pression ICS 49.140 In accordance with the provisions of Council Resolution 15/1993 this document is circulated in the English language only. Conformment aux dispositions de la Rsolution du Co
21、nseil 15/1993, ce document est distribu en version anglaise seulement. To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage. Pour acclrer la distribution,
22、 le prsent document est distribu tel quil est parvenu du secrtariat du comit. Le travail de rdaction et de composition de texte sera effectu au Secrtariat central de lISO au stade de publication. Licensed Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00
23、 2007, Uncontrolled Copy, (c) BSI ISO/DIS 24638 ii ISO 2007 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to
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28、e 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 Reproduction may be subject to royalty payments or a licensing agreement. Violators may be prosecuted. Licensed Copy: London South B
29、ank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO/DIS 24638 ISO 2006 All rights reserved iii Contents Page Foreword vi Introductionvi 1 Scope1 1.1 Purpose 1 1.2 Field of application1 2 Normative references1 3 Terms and definitions.1 4 Sy
30、mbols and abbreviated terms5 5 General requirements .5 5.1 General .5 5.2 Design requirements.5 5.2.1 Loads, pressures, and environments5 5.2.2 Strength6 5.2.3 Stiffness .6 5.2.4 Thermal effects6 5.2.5 Stress analysis 6 5.2.6 Fatigue analysis/or damage tolerance (safe-life) analysis6 5.3 Material re
31、quirements.7 5.3.1 Metallic materials.7 5.3.2 Non-metallic-material requirements7 5.4 Fabrication and process requirements.7 5.5 Contamination control and cleanliness requirements8 5.5.1 General contamination control requirements 8 5.5.2 Design considerations8 5.6 Quality assurance (QA) program requ
32、irements.8 5.6.1 General .8 5.6.2 QA program inspection plan requirements9 5.6.3 QA inspection technique requirements9 5.6.4 QA inspection data requirements9 5.6.5 Acceptance test requirements.9 5.7 Qualification Test Requirements.10 5.8 Operation and maintenance requirements.10 5.8.1 Operating proc
33、edure.10 5.8.2 Safe operating limits.10 5.8.3 Inspection and maintenance10 5.8.4 Repair and refurbishment.10 5.8.5 Storage .11 5.8.6 Documentation 11 5.8.7 Reactivation .11 5.8.8 Recertification11 6 General pressurized-system requirements 12 6.1 System analysis requirements.12 6.1.1 System pressure
34、analysis 12 6.1.2 System functional analysis 12 6.1.3 System hazard analysis12 6.2 Design features13 6.2.1 Assembly13 6.2.2 Routing.13 6.2.3 Separation13 DRAFT 2007 Licensed Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) B
35、SI ISO/DIS 24638 iv ISO 2006 All rights reserved 6.2.4 Shielding 13 6.2.5 Grounding 13 6.2.6 Handling. 13 6.2.7 Special tools 13 6.2.8 Test points. 13 6.2.9 Common-plug test connectors 13 6.2.10 Individual test connectors. 14 6.2.11 Threaded parts 14 6.2.12 Friction-type locking devices 14 6.2.13 In
36、ternally threaded bosses 14 6.2.14 Retainer or snap rings 14 6.2.15 Snubbers . 14 6.3 Component selection . 14 6.3.1 Connections 14 6.3.2 Fluid temperature 14 6.3.3 Actuator pressure rating 14 6.3.4 Pressure rating 14 6.3.5 Pump selection . 15 6.3.6 Fracture and leakage 15 6.3.7 Oxygen system compon
37、ents. 15 6.3.8 Pressure regulators 15 6.3.9 Manual valves and regulators . 15 6.4 Design pressures 15 6.4.1 Overpressure or underpressure 15 6.4.2 Back pressure. 15 6.4.3 Pressure isolation. 15 6.4.4 Gas/fluid separation . 15 6.4.5 Compressed-gas bleeding. 15 6.5 Mechanical-environment design. 16 6.
38、5.1 Acceleration and shock loads. 16 6.5.2 Torque loads . 16 6.5.3 Vibration loads 16 6.6 Controls. 16 6.6.1 Interlocks. 16 6.6.2 Multiple safety-critical functions. 16 6.6.3 Critical flows and pressures 16 6.7 Protection 16 6.8 Electrical 16 6.8.1 Hazardous atmospheres 16 6.8.2 Radio frequency ener
39、gy. 16 6.8.3 Grounding 17 6.8.4 Solenoids. 17 6.8.5 Electric-motor-driven pumps. 17 6.9 Pressure relief. 17 6.9.1 General requirements. 17 6.9.2 Flow capacity 17 6.9.3 Sizing . 17 6.9.4 Unmanned flight vehicle servicing . 17 6.9.5 Automatic relief. 17 6.9.6 Venting. 18 6.9.7 Relief valve isolation 1
40、8 6.9.8 Negative-pressure protection 18 6.9.9 Reservoir pressure relief . 18 6.9.10 Air pressure control . 18 6.10 Control devices. 18 6.10.1 Directional control valves 18 6.10.2 Overtravel 18 6.10.3 Pressure and volume control stops 19 6.10.4 Manually operated levers. 19 6.11 Accumulators 19 DRAFT
41、2007 Licensed Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO/DIS 24638 ISO 2006 All rights reserved v 6.11.1 Accumulator design19 6.11.2 Accumulator gas pressure gauges .19 6.11.3 Accumulator identification.19 6.12
42、 Flexhose.19 6.12.1 Installation19 6.12.2 Restraining devices.19 6.12.3 Flexhose stress .20 6.12.4 Temporary installations20 7 Specific pressure system requirements.20 7.1 General .20 7.2 Hydraulic systems.20 7.2.1 Hydraulic system components20 7.2.2 Pressure limit.21 7.2.3 Cavitations .21 7.2.4 Hyd
43、raulic lockup21 7.2.5 Pressure relief22 7.3 Pneumatic-system requirements.22 7.3.1 Pneumatic-system components22 7.3.2 Controls23 Annex A (informative) Recommended minimum safety factors 25 Annex B (informative) Open line force calculation factors.26 DRAFT 2007 Licensed Copy: London South Bank Unive
44、rsity, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO/DIS 24638 vi ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
45、preparing International Standards is normally carried out through ISO 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,
46、 in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main t
47、ask of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attent
48、ion 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 identifying any or all such patent rights. ISO 24638 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, S
49、pace systems and operations. DRAFT 2007 Licensed Copy: London South Bank University, London South Bank University, Wed May 16 04:11:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO/DIS 24638 ISO 2006 All rights reserved vii Introduction Space vehicles and their launch systems usually have a series of engines to use for both primary propulsion and secondary propulsion functions such as attitud