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1、 Reference number ISO 14952-1:2003(E) ISO 2003 INTERNATIONAL 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 ISO 14952-1:2003(E) PDF disclaimer
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6、uester. 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 2003 All rights reserved ISO 14952-1:2003(E) ISO 2003 All rights reserved iii Foreword ISO (the International Organizati
7、on 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 established ha
8、s 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 standardization. Inte
9、rnational 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 voting. Publica
10、tion 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 patent rig
11、hts. 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: Part 1: Vocabulary Part 2: Cleanliness
12、 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 ISO 14952-1:2003(E) iv ISO 2003 All rights reserved Introduction This part of ISO 14952 def
13、ines 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 launch vehicles, spacecraft and ground support equipment.
14、 INTERNATIONAL STANDARD ISO 14952-1:2003(E) ISO 2003 All rights reserved 1 Space 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 for equipment and components used in space fluid systems. It is applic
15、able 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 close a value is to the “true” value 2.2 assembly two or more parts (2
16、.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 component article that is normally a combination of parts (2.19) or assemb
17、lies (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 critical surface any surface of an item that contacts the critical service
18、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 prevailing pressure NOTE The prevailing pressure is usually atmospheric
19、pressure. ISO 14952-1:2003(E) 2 ISO 2003 All rights reserved 2.9 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 cleaning (2.25) of components (2.4) and systems (2.30) which cannot be processed in a co
20、ntrolled 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 examination NOTE This level does not apply to hardware that is sensitive to contaminatio
21、n. 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 hydrogen 2.15 hypergolic propellants any fuel/catalyst (monopropellant) or fuel/oxidizer (
22、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 particulate matter remaining after temperature-controlled evaporation of a filtered, vo
23、latile 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 part of ISO 14952, gaseous oxygen and breathing air are considered to be oxidizers. 2.1
24、9 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, or system. ISO 14952-1:2003(E) ISO 2003 All rights reserved 3 EXAMPLE Fittings, O-rings
25、, 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 size NOTE Various methods for defining size may be used and are dependant upon the measurement technique.
26、 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 2.21.2 particle size automatic method equivalent diameter of a particle detected by automatic instrument
27、ation 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 passivation process by which a corrosive-resistant layer is bonded to a metal surface by submersing the surfa
28、ce 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 a solution. NOTE 2 The pH is measured over the nominal range of 0 to 14. NOTE 3 A pH reading below 7 i
29、s 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 to achieve cleanliness levels more stringent than visibly clean (2.35) 2.26 repeatability closeness o
30、f 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 cleaning process normally used to achieve the visibly clean (2.35) cleanliness level 2.28 silting accumul
31、ation 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 magnification -,-,- ISO 14952-1:2003(E) 4 ISO 2003 All rights reserved 2.29 subsystem two or more assemblies (2
32、.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 (2.29) joined together to perform a definite function 2.31 test fluid fluid (2.11), which is either a liquid solve
33、nt 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, 5-day week, to which an average worker may be exposed to hazardous chemicals without harmful effect NOTE 1 The
34、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 proving that an item, subsystem (2.29), or system (2.30) meets the specified requirements 2.34 verify/verification
35、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 flush might be used to verify the cleanliness level of a system. 2.35 visibly clean VC absence of surface contami
36、nation 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) methods but a particle (2.20) count may be optional. NOTE 2 Fluorescence indicates possible contamination by, fo
37、r 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 if the cleaning method is adequate. 2.36 visibly clean plus ultraviolet VC + UV cleaning level that is visibly
38、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 ISO 14952-1:2003(E) ISO 2003 All rights reserved 5 2.37 volatile hydrocarbon hydrocarbon (2.14) capable of going from liquid or solid to a gaseous state at ambi
39、ent temperature and pressure ISO 14952-1:2003(E) 6 ISO 2003 All rights reserved Bibliography 1 ISO 9000:2000, Quality management systems Fundamentals and vocabulary 2 VIM:1993, International vocabulary of basic and general terms in metrology. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML ISO 14952-1:2003
40、(E) ISO 2003 All rights reserved 7 Index A accuracy 2.1 assembly 2.2 B blank 2.3 C component 2.4 condensable hydrocarbon 2.5 critical surface 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
41、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 particle 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 subsy
42、stem 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 clean 2.35 visibly clean plus ultraviolet 2.36 volatile hydrocarbon 2.37 ISO 14952-1:2003(E) ICS 49.080; 49.140 Price based on 7 pages ISO 2003 All rights reserved