1、BRITISH STANDARD AEROSPACE SERIES BS ISO 14952-1:2003 Space systems Surface cleanliness of fluid systems Part 1: Vocabulary ICS 49.080; 49.140 BS ISO 14952-1:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 February 2004 BSI 4 February
2、2004 ISBN 0 580 43340 4 National foreword This British Standard reproduces verbatim ISO 14952-1:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations, which has the responsibility to: A li
3、st of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspo
4、ndence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of
5、itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments a
6、nd promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since pub
7、lication Amd. No. Date Comments Reference number ISO 14952-1:2003(E) OSI 3002INTERNATIONAL STANDARD ISO 14952-1 First edition 2003-11-15 Space systems Surface cleanliness of fluid systems Part 1: Vocabulary Systmes spatiaux Propret des surfaces en contact avec des fluides Partie 1: Vocabulaire BSISO
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13、eword 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 tech
14、nical 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
15、 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 t
16、o 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
17、 identifying any or all such patent rights. ISO 14952-1 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. ISO 14952 consists of the following parts, under the general title Space systems Surface cleanliness of fluid systems:
18、 Part 1: Vocabulary Part 2: Cleanliness levels Part 3: Analytical procedures for the determination of nonvolatile residues and particulate contamination Part 4: Rough-cleaning processes Part 5: Drying processes Part 6: Precision-cleaning processes BSISO149521:2003IS-25941 O1:(3002E) iv I SO 3002 All
19、 irhgts seredevrIntroduction This part of ISO 14952 defines the terms intended for use in cleaning processes for equipment and components used in space fluid systems. The purpose of this part of ISO 14952 is to establish uniform terms used in the cleaning, analysis, and verification processes for la
20、unch vehicles, spacecraft and ground support equipment. BSISO149521:2003INTENRATIONAL TSANDADR IS-25941 O1:(3002E)I SO 3002 All irhgts seredevr 1Space systems Surface cleanliness of fluid systems Part 1: Vocabulary 1 Scope This part of ISO 14952 defines the basic terms for use in cleaning processes
21、for equipment and components used in space fluid systems. It is applicable to terms used in the description of processes for the cleaning, analysis and verification of fluid systems used in ground support equipment, launch vehicles and spacecraft. 2 Terms and definitions 2.1 accuracy measure of how
22、close a value is to the “true” value 2.2 assembly two or more parts (2.19) having a common mounting and being capable of performing a definite function 2.3 blank result for an analytical sample of the virgin test fluid (2.11) prior to use in performing a cleanliness verification (2.34) test 2.4 comp
23、onent article that is normally a combination of parts (2.19) or assemblies (2.2) and is a self-contained element within complete operating equipment 2.5 condensable hydrocarbon hydrocarbon (2.14) capable of going from a gaseous to a liquid or solid state at ambient temperature and pressure 2.6 criti
24、cal surface any surface of an item that contacts the critical service medium (liquid oxygen, pneumatic gases, etc.) 2.7 dewar double-walled vessel with the annular space between the walls evacuated to provide insulation 2.8 dewpoint temperature at which condensation of water vapour takes place at pr
25、evailing pressure NOTE The prevailing pressure is usually atmospheric pressure. BSISO149521:2003IS-25941 O1:(3002E) 2 I SO 3002 All irhgts seredevr2.9 fibre flexible structure having a length-to-width ratio of 10 to 1 or greater 2.10 field cleaning processes of rough cleaning (2.27) and precision cl
26、eaning (2.25) of components (2.4) and systems (2.30) which cannot be processed in a controlled environment such as a clean room 2.11 fluid gas or liquid 2.12 generally clean GC free from manufacturing residue, dirt, oil, grease, processing debris, or other extraneous contamination based on visual ex
27、amination NOTE This level does not apply to hardware that is sensitive to contamination. 2.13 high-efficiency particulate air filter HEPA filter that is at least 99,97 % efficient by volume on 0,3 m particles 2.14 hydrocarbon organic compound consisting exclusively of the elements of carbon and hydr
28、ogen 2.15 hypergolic propellants any fuel/catalyst (monopropellant) or fuel/oxidizer (bipropellant) combination that ignites spontaneously and is used in propelling a rocket 2.16 item assembly, component, subsystem, or system 2.17 nonvolatile residue NVR soluble or suspended material and insoluble p
29、articulate matter remaining after temperature-controlled evaporation of a filtered, volatile liquid 2.18 oxidizer chemical reactants, such as liquid oxygen and nitrogen tetroxide, which when combined with appropriate fuels constitute the propellants for rocket engines NOTE For the purposes of this p
30、art of ISO 14952, gaseous oxygen and breathing air are considered to be oxidizers. 2.19 part one unit of two or more pieces joined together in such a way that it is not normally disassembled without destruction of the designed use NOTE A part is the basic unit in an assembly, component, subsystem, o
31、r system. BSISO149521:2003IS-25941 O1:(3002E) I SO 3002 All irhgts seredevr 3EXAMPLE Fittings, O-rings, and poppets are normally considered pieces that comprise a valve that is considered a part of an assembly (2.2). 2.20 particle unit of solid or liquid matter with observable size 2.21 Particle siz
32、e NOTE Various methods for defining size may be used and are dependant upon the measurement technique. 2.21.1 particle size manual method apparent maximum linear dimension of a particle in the plane of observation as observed with instruments such as optical, electron, or atomic force microscopes 2.
33、21.2 particle size automatic method equivalent diameter of a particle detected by automatic instrumentation NOTE The equivalent diameter is the diameter of a reference sphere having known properties and producing the same response in the sensing instrument as the particle being measured 2.22 passiva
34、tion process by which a corrosive-resistant layer is bonded to a metal surface by submersing the surface in an acid solution 2.23 pH value taken to represent the acidity or alkalinity of an aqueous solution NOTE 1 pH is defined as the logarithm of the reciprocal of the hydrogen ion concentration of
35、a solution. NOTE 2 The pH is measured over the nominal range of 0 to 14. NOTE 3 A pH reading below 7 is acidic, pH 7 is neutral, and pH above 7 is alkaline. 2.24 pickling chemical or electrochemical process by which surface oxides are removed from metals 2.25 precision cleaning cleaning process used
36、 to achieve cleanliness levels more stringent than visibly clean (2.35) 2.26 repeatability closeness of the agreement between the results of successive measurements of the same measurand carried out under the same conditions of measurement VIM:1993, definition 3.6 2.27 rough cleaning/precleaning cle
37、aning process normally used to achieve the visibly clean (2.35) cleanliness level 2.28 silting accumulation of particles (2.20) (approximately 2 m to 20 m) of sufficient quantity to cause a haze or obscuring of any portion of a filter membrane when viewed visually or under 40-power maximum magnifica
38、tion BSISO149521:2003IS-25941 O1:(3002E) 4 I SO 3002 All irhgts seredevr2.29 subsystem two or more assemblies (2.2) joined together to perform a definite function NOTE A subsystem should be capable of independent operation when interconnected into a system (2.30). 2.30 system series of subsystems (2
39、.29) joined together to perform a definite function 2.31 test fluid fluid (2.11), which is either a liquid solvent or an aqueous solution, that is utilized to determine the fluid system wetted-surface cleanliness level 2.32 threshold limit valve TLV maximum average daily dosage, based on an 8-h day,
40、 5-day week, to which an average worker may be exposed to hazardous chemicals without harmful effect NOTE 1 The TLV is a time-weighted average concentration. NOTE 2 The TLV is normally expressed in parts of the gas or vapour in microlitres per litre. 2.33 validate/validation process or method of pro
41、ving that an item, subsystem (2.29), or system (2.30) meets the specified requirements 2.34 verify/verification process or method to establish the truth, accuracy (2.1), or reality of the cleanliness level of a cleaned item NOTE This definition is different from that in ISO 9000. EXAMPLE A solvent f
42、lush might be used to verify the cleanliness level of a system. 2.35 visibly clean VC absence of surface contamination when examined using a specified light source and angle of incidence, viewing distance and angle, and normal or magnified vision NOTE 1 This level requires precision-cleaning (2.25)
43、methods but a particle (2.20) count may be optional. NOTE 2 Fluorescence indicates possible contamination by, for example, a hydrocarbon (2.14). NOTE 3 If recleaning fails to remove fluorescent indications, an investigation should be made to determine if the item material is naturally fluorescent or
44、 if the cleaning method is adequate. 2.36 visibly clean plus ultraviolet VC + UV cleaning level that is visibly clean (VC) and also meets the requirements for inspection with the aid of an ultraviolet light (black light) of wavelength 320 nm to 380 nm BSISO149521:2003IS-25941 O1:(3002E) I SO 3002 Al
45、l irhgts seredevr 52.37 volatile hydrocarbon hydrocarbon (2.14) capable of going from liquid or solid to a gaseous state at ambient temperature and pressure BSISO149521:2003IS-25941 O1:(3002E) 6 I SO 3002 All irhgts seredevrBibliography 1 ISO 9000:2000, Quality management systems Fundamentals and vo
46、cabulary 2 VIM:1993, International vocabulary of basic and general terms in metrology. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML BSISO149521:2003IS-25941 O1:(3002E) I SO 3002 All irhgts seredevr 7Index A accuracy 2.1 assembly 2.2 B blank 2.3 C component 2.4 condensable hydrocarbon 2.5 critical surfac
47、e 2.6 D dewar 2.7 dewpoint 2.8 F fibre 2.9 field cleaning 2.10 fluid 2.31. 2.11 G GC 2.12 generally clean 2.12 H HEPA 2.13 high-efficiency particulate air 2.13 hydrocarbon 2.14 hypergolic propellants 2.15 I item 2.16 N nonvolatile residue 2.17 NVR 2.17 O oxidizer 2.18 P part 2.19 particle 2.20 parti
48、cle size 2.21.2. 2.21.1 passivation 2.22 pH 2.23 pickling 2.24 precision cleaning 2.25 R repeatability 2.26 rough cleaning/precleaning 2.27 S silting 2.28 subsystem 2.29 system 2.30 T threshold limit valve 2.32 TLV 2.32 V validate/validation 2.33 VC 2.35 VC + UV 2.36 verify/verification 2.34 visibly
49、 clean 2.35 visibly clean plus ultraviolet 2.36 volatile hydrocarbon 2.37 BSISO149521:2003BS ISO 14952-1:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Br
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