1、BRITISH STANDARD AEROSPACE SERIES BS ISO 14952-2:2003 Space systems Surface cleanliness of fluid systems Part 2: Cleanliness levels ICS 49.080; 49.140 BS ISO 14952-2:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 February 2004 BSI 4 F
2、ebruary 2004 ISBN 0 580 43341 2 National foreword This British Standard reproduces verbatim ISO 14952-2:2003 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
3、to: A list 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
4、Correspondence 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
5、 not of 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 develo
6、pments and 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 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issue
7、d. Amendments issued since publication Amd. No. Date Comments Reference number ISO 14952-2:2003(E) OSI 3002INTERNATIONAL STANDARD ISO 14952-2 First edition 2003-11-15 Space systems Surface cleanliness of fluid systems Part 2: Cleanliness levels Systmes spatiaux Propret des surfaces en contact avec d
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13、:(3002E) I SO 3002 All irhgts seredevr iiiForeword 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
14、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, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electr
15、otechnical 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 task of technical committees is to prepare International Standards. Draft International Standards adopted
16、 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
17、rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14952-2 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
18、systems Surface cleanliness of fluid systems: 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 BSISO14
19、9522:2003IS-25941 O2:(3002E) iv I SO 3002 All irhgts seredevrIntroduction This part of ISO 14952 defines the cleanliness levels 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 cleanliness l
20、evels for use in the cleaning, analysis, and verification processes for launch vehicles, spacecraft and ground support equipment. BSISO149522:2003INTENRATIONAL TSANDADR IS-25941 O2:(3002E)I SO 3002 All irhgts seredevr 1Space systems Surface cleanliness of fluid systems Part 2: Cleanliness levels 1 S
21、cope This part of ISO 14952 defines the cleanliness levels used in the cleaning, analysis, and verification procedures for space fluid systems. It establishes a common nomenclature for use in describing cleanliness levels for equipment used in ground support equipment, launch vehicles and spacecraft
22、. This part of ISO 14952 is used to specify the cleanliness level of fluid system components and equipment used in space systems. It is applicable equally to ground support equipment, launch vehicles and spacecraft. 2 Normative references The following referenced documents are indispensable for the
23、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 14952-1:2003, Space systems Surface cleanliness of fluid systems Part 1: Vocabulary ISO 14952-3:2003, Spac
24、e systems Surface cleanliness of fluid systems Part 3: Analytical procedures for the determination of nonvolatile residues and particulate contamination 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 14952-1 apply. 4 Classification 4.1 General Parti
25、cle cleanliness levels are listed in Table 1, nonvolatile residue (NVR) contamination levels are listed in Table 2, and visible contamination levels are listed in Table 3. Particle cleanliness is based on particle counting using aided or unaided eye analysis, NVR analysis is based on fluid solvent a
26、nalysis, and the contamination levels are typically obtained by chemical analysis. Annex A gives the background for these tables. 4.2 Code usage After the desired level of cleanliness is decided, the appropriate code for that level shall be derived from the appropriate table or tables, as needed. Th
27、is code shall be used to specify to the cleaning facility the desired level of cleanliness. After cleaning, analysis and verification are completed by the cleaning facility, the cleaned part or component shall be sealed in a package and marked with the cleaning code attached to the package. BSISO149
28、522:2003IS-25941 O2:(3002E) 2 I SO 3002 All irhgts seredevrProduct cleanliness levels shall be determined by program and system requirements specified as in the following examples. a) Level 200 refers to limits on particulate matter contamination only. b) Level 200B refers to limits on particulate m
29、atter and nonvolatile residue (NVR) contamination. c) Level B refers to limits on NVR only. d) Level 200A is a more stringent cleaning level than level 300B for both particulate matter and NVR. e) A component cleaned to a more stringent cleanliness level than is required for a system application may
30、 be used in the system application (e.g. a component cleaned to level 200A may be used in a system application requiring cleanliness level 250A or some less stringent cleanliness level). 5 Test methods Cleanliness level test methods shall be as follows. Method Description I Liquid flush test for par
31、ticle population and NVR remaining on critical surfaces of items normally cleaned in a controlled environment (applicable for small parts, vessels and surface areas) II Liquid flow test for monitoring particle population and NVR remaining on critical surfaces of items normally cleaned in the field (
32、applicable to hoses, tubing, subsystems and systems) III Gas flow test for moisture remaining on critical surface after cleaning (applicable to vessels, subsystems and systems) IV Liquid flow test to evaluate systems capability to deliver fluid that meets specified cleanliness (particle or NVR) requ
33、irements (applicable to inservice systems) V Gas flow test method to evaluate systems capability to deliver fluid or gases that meet specified cleanliness (particle or NVR) requirements (applicable to inservice systems) VI Gas flow test method to evaluate the cleanliness of a pipeline and associated
34、 parts after cleaning with a liquid wetted tampon, slug or mole. Determination of the cleanliness level of a component or system shall be made by using Method I or II unless otherwise specified by the customer. Procedures for Methods I, II, III, IV, V and VI are specified in ISO 14952-3. BSISO149522
35、:2003IS-25941 O2:(3002E) I SO 3002 All irhgts seredevr 3Table 1 Particle cleanliness levels Cleanliness level Particle size (m) Maximum allowable particle count (per 0,1 m 2 ) Maximum allowable particle count (per litre) 1 X 1 X = 1 1 X a1 0 a10 0 5 X 1 1 u X 2 2 u X 5 5 u X aa1 0 aa10 0 10 X 1 1 u
36、X 2 2 u X 5 5 u X 10 10 u X a1 4 2 0 a10 40 20 0 25 X 2 2 u X 5 5 u X 15 15 u X 25 25 u X a30 19 2 0 a304 194 24 0 50 X 5 5 u X 15 15 u X 25 25 u X 50 50 u X a141 17 6 0 a1 410 174 63 0 100 X 5 5 u X 15 15 u X 25 25 u X 50 50 u X 100 100 u X a1 520 187 68 10 0 a1 520 1 870 677 97 0 200 X 5 15 u X 25
37、 25 u X 50 50 u X 100 100 u X 200 200 u X a2 950 1 070 154 15 0 a29 500 10 700 1 540 148 0 300 X 25 25 u X 50 50 u X 100 100 u X 250 250 u X 300 300 u X a6 430 926 93 1 0 a64 300 9 260 928 13 0 BSISO149522:2003IS-25941 O2:(3002E) 4 I SO 3002 All irhgts seredevrTable 1 (continued) Cleanliness level P
38、article size (m) Maximum allowable particle count (per 0,1 m 2 ) Maximum allowable particle count (per litre) 500 X 50 50 u X 100 100 u X 250 250 u X 500 500 u X a10 720 1 075 25 0 a107 200 10 750 250 0 a750 X 50 50 u X 100 100 u X 250 250 u X 500 500 u X 750 750 u X a86 890 8 705 206 7 0 a868 890 8
39、7 050 2 060 70 0 1 000 X 100 100 u X 250 250 u X 500 500 u X 750 750 u X 1 000 1 000 u X a41 635 980 34 4 0 a416 350 9 800 340 40 0 NOTE 1 The particles per litre for fluids column is presented for information only. Fluid system cleanliness should be specified and measured as particles per 0,1 m 2 .
40、 Fluid cleanliness may be presented as particles per litre. NOTE 2 X is the particle count. NOTE 3 Cleanliness levels were based on Military Standard MIL-STD-1246C, Product Cleanliness Levels and Contamination Control Program, 1994. aNo silting allowed. BSISO149522:2003IS-25941 O2:(3002E) I SO 3002
41、All irhgts seredevr 5Table 2 NVR contamination levels NVR level NVR limit surface (mg/0,1 m 2 ) NVR limit volume (mg/l) A/100 0,01 mg 0,1 mg A/50 0,02 mg 0,2 mg A/20 0,05 mg 0,5 mg A/10 0,1 mg 1,0 mg A/5 0,2 mg 2,0 mg A/2 0,5 mg 5,0 mg A 1,0 mg 10 mg B 2,0 mg 20 mg C 3,0 mg 30 mg D 4,0 mg 40 mg E 5,
42、0 mg 50 mg F 7,0 mg 70 mg G 10,0 mg 100 mg H 15,0 mg 150 mg J 25,0 mg 250 mg Table 3 Visible contamination levels Level Definition GC Freedom from manufacturing residue, dirt, oil, grease, etc. VC Absence of all particulate and nonparticulate matter visible to the normal unaided eye or corrected-vis
43、ion eye VU Visibly clean and inspected with an ultraviolet light wavelength of 320 nm to 380 nm BSISO149522:2003IS-25941 O2:(3002E) 6 I SO 3002 All irhgts seredevrAnnex A (informative) Background Table 1 was derived from a log-log 2distribution of particles with a slope of 0,926 that was based on a
44、lognormal distribution with the maximum number of particles at the 1 m size. This lognormal distribution was derived from measurements of precision-cleaned hardware and, therefore, is representative of cleaned products. Tables 1 and 2 prescribe the cleanliness levels established to provide a uniform
45、 set of criteria for specifying product cleanliness in terms of particles or NVR or both. Cleanliness levels in Tables 1 and 2 are specified in terms of maximum amounts per unit area (0,1 m 2 ) or volume of test fluid (1 litre). Table 3 prescribes the product cleanliness level in terms of visual eva
46、luation. Unless otherwise specified, cleanliness levels are specified in terms of maximum amounts per unit extent (area, volume or mass) such as counts per 0,1 m 2 . The use of a particular extent does not imply that the measurements are to be taken over this extent, but rather that the total amount
47、 is to be divided by the total extent. In general, higher accuracy is fostered by the measurement of larger extents. BSISO149522:2003blankBS ISO 14952-2:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing Brit
48、ish Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is
49、the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updat
