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1、 Reference number ISO 24638:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 24638 First edition 2008-11-15 Space systems Pressure components and pressure system integration Systmes spatiaux Intgration des composants sous pression et des systmes sous pression Copyright International Organization for Stan
2、dardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lice
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7、-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 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale,
8、01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Abbreviated terms 5 5 General requirements. 5 5
9、.1 General. 5 5.2 Design requirements 5 5.3 Material requirements. 7 5.4 Fabrication and process requirements 7 5.5 Contamination control and cleanliness requirements 8 5.6 Quality assurance programme requirements 8 5.7 Qualification test requirements. 10 5.8 Operation and maintenance requirements 1
10、0 6 General pressurized-system requirements 12 6.1 System analysis requirements 12 6.2 Design features. 13 6.3 Component selection . 14 6.4 Design pressures 15 6.5 Mechanical-environment design. 16 6.6 Controls . 16 6.7 Protection 17 6.8 Electrical 17 6.9 Pressure relief. 17 6.10 Control devices. 19
11、 6.11 Accumulators 19 6.12 Flexhose 20 7 Specific pressure system requirements. 20 7.1 General. 20 7.2 Hydraulic systems 20 7.3 Pneumatic-system requirements 23 Annex A (informative) Recommended minimum safety factors 24 Annex B (informative) Open line force calculation factors 25 Copyright Internat
12、ional Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the International
13、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 technical committee has been esta
14、blished 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 electrotechnical standardiza
15、tion. 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 the member bodies for votin
16、g. 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 identifying any or all such
17、patent rights. ISO 24638 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2
18、009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) ISO 2008 All rights reserved v 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
19、 attitude control and spin control. Different engines have different propellant feed systems; for example, the gas-pressure feed system is typically used for liquid propellant engines, and it consists of a high-pressure gas tank, a fuel tank and an oxidizer tank, valves and a pressure regulator. All
20、 these components are referred to as pressurized hardware. Due to their specific usage, the liquid propellant tanks and the high-pressure gas bottles are often referred to as pressure vessels, while valves, regulators and feed lines are usually called pressure components. ISO 14623 sets forth the st
21、andard requirements for pressure vessels in order to achieve safe operation and mission success. However, the requirements for pressure components are not covered in ISO 14623. Furthermore, the standard requirements for pressure system integration are lacking. Significant work has been done in the a
22、rea of design, analysis and testing of pressure components for use in space systems. This International Standard establishes the preferred methods for these techniques and sets forth the requirements for assembly, installation, test, inspection, operation and maintenance of the pressure systems in s
23、pacecraft and launch vehicles. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organizat
24、ion for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 24638:2008(E) ISO 2008 All rights reserved 1 Space systems Pressure co
25、mponents and pressure system integration 1 Scope This International Standard establishes the baseline requirements for the design, fabrication and testing of space flight pressure components. It also establishes the requirements for assembly, installation, test, inspection, operation and maintenance
26、 of the pressure systems in spacecraft and launch vehicles. These requirements, when implemented on a particular space system, ensure a high level of confidence in achieving safe and reliable operation. This International Standard applies to all pressure components other than pressure vessels and pr
27、essurized structures in a pressure system. It covers lines, fittings, valves, bellows, hoses and other appropriate components that are integrated to form a pressure system. The requirements for pressure vessels and pressurized structures are set forth in ISO 14623. This International Standard does n
28、ot apply to engine components. 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) appl
29、ies. ISO 14623, Space systems Pressure vessels and pressurized structures Design and operation ISO 21347, Space systems Fracture and damage control 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 A-basis allowable mechanical strength value ab
30、ove which at least 99 % of the population of values is expected to fall, with a confidence level of 95 % NOTE See also B-basis allowable (3.3). 3.2 applied load applied stress actual load (stress) imposed on the hardware in the service environment Copyright International Organization for Standardiza
31、tion Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) 2 ISO 2008 All rights reserved 3.3 B-basis allowable mechanical strength value above which at leas
32、t 90 % of the population of values is expected to fall, with a confidence level of 95 % NOTE See also A-basis allowable (3.1). 3.4 component functional unit that is viewed as an entity for the purpose of analysis, manufacturing, maintenance, or record keeping 3.5 critical condition most severe envir
33、onmental condition in terms of loads, pressures and temperatures, or combinations thereof, imposed on systems, subsystems, structures and components during service life 3.6 damage tolerance ability of a material or structure to resist failure due to the presence of flaws, cracks, delaminations, impa
34、ct damage or other mechanical damage for a specified period of unrepaired usage 3.7 damage tolerance analysis safe-life analysis fracture mechanics-based analysis that predicts the flaw growth behaviour of a flawed hardware item which is under service load spectrum with a pre-specified scatter facto
35、r 3.8 design burst pressure burst pressure ultimate pressure differential pressure that pressurized hardware needs to withstand without burst in the applicable operational environment NOTE Design burst pressure is equal to the product of the maximum expected operating pressure or maximum design pres
36、sure and a design burst factor. 3.9 design safety factor design factor of safety factor of safety multiplying factor to be applied to limit loads and/or maximum expected operating pressure (or maximum design pressure) 3.10 detrimental deformation structural deformation, deflection or displacement th
37、at prevents any portion of the structure or other system from performing its intended function 3.11 fittings pressure components of a pressurized system used to connect lines, other pressure components and/or pressure vessels within the system 3.12 hazard existing or potential condition that can res
38、ult in an accident Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) ISO 2008 All rights reserve
39、d 3 3.13 hydrogen embrittlement mechanical-environmental failure process that results from the initial presence or absorption of excessive amounts of hydrogen in metals, usually in combination with residual or applied tensile stresses 3.14 limit load highest predicted load or combination of loads th
40、at a structure can experience during its service life, in association with the applicable operating environments NOTE The corresponding stress is called “limit stress”. 3.15 lines tubular pressure components of a pressurized system provided as a means for transferring fluids between components of th
41、e system NOTE Flexhoses are included. 3.16 loading spectrum representation of the cumulative loading anticipated for the structure under all expected operating environments NOTE Significant transportation and handling loads are included. 3.17 maximum allowed working pressure MAWP maximum differentia
42、l pressure of a component designed to withstand safety and continue to operate normally when installed in any pressure system 3.18 maximum design pressure MDP highest differential pressure defined by maximum relief pressure, maximum regulator pressure and/or maximum temperature, including transient
43、pressures, at which a pressurized hardware item retains two-fault tolerance without failure 3.19 maximum expected operating pressure MEOP highest differential pressure that a pressurized hardware item is expected to experience during its service life and yet retain its functionality, in association
44、with its applicable operating environments NOTE In this International Standard, the use of the term “maximum expected operating pressure (MEOP)” also signifies “maximum design pressure (MDP)”, “maximum operating pressure (MOP)” or “maximum allowed working pressure (MAWP)”, as appropriate, for a spec
45、ific application or programme. 3.20 maximum operating pressure MOP maximum differential pressure at which the component or the pressure system actually operates in an application NOTE MOP is synonymous with MEOP. Copyright International Organization for Standardization Provided by IHS under license
46、with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/31/2009 02:07:55 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24638:2008(E) 4 ISO 2008 All rights reserved 3.21 pressure component component in a pressure system, other than a pressure vessel, or a pressurized
47、 structure that is designed largely by the internal pressure EXAMPLE Lines, fittings, pressure gauges, valves, bellows and hoses. 3.22 pressure vessel container designed primarily for the storage of pressurized fluids, which either contains gas/liquid with high energy level, or contains gas/liquid t
48、hat will create a mishap (accident) if released, or contains gas/liquid with high pressure level NOTE 1 This definition excludes pressurized structures and pressure components. NOTE 2 Energy and pressure levels are defined by each project and approved by the procuring authority (customer). If appropriate values are not defined by the project, the following levels are used: stored energy is at least 19 310 J, based on adiabatic expansion of