1、BRITISH STANDARD AEROSPACE SERIES BS3G198-2: 1997 Sleeves and moulded components for aircraft electric cables and equipment wires Part 2: Specification for slip-on sleeves for identification purposes ICS 49.060BS3G198-2:1997 This British Standard, having been prepared under the directionof the Engin
2、eering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 November1997 BSI10-1999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment96/713869 DC ISBN 0 580 28327 5 Committees responsible for this
3、British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, upon which the following bodies were represented: British Airways British Cable Makers Confederation British Rubber Manufacturers Associatio
4、n Civil Aviation Authority (Airworthiness Division) Federation of the Electronics Industry Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBS3G198-2:1997 BSI 10-1999 i Contents Page Committees responsible Inside front cover Forewor
5、d ii 1 Scope 1 2 References 1 3 Information and requirements to be agreed and documented 1 4 Materials 1 5 Colour 1 6 Finish 1 7 Printing 2 8 Dimensions 3 9 Type testing 3 10 Production routine and quality testing 4 11 Tests 5 12 Marking and packaging 10 Annex A (informative) Storage recommendations
6、 11 Figure 1 Disposition of characters on identification sleeves 2 Table 1 Size of printed characters 2 Table 2 Dimensions of type7 sleeves 3 Table 3 Standard cutting tolerances for cut lengths of sleeves 4 Table 4 Type tests 4 Table 5 Production routine tests 4 Table 6 Production quality tests 4 Ta
7、ble 7 List of test fluids 9 Table 8 Standard colours, availability and coding 10 List of references 12BS3G198-2:1997 ii BSI 10-1999 Foreword This Part of BS G198 has been prepared by Technical Committee ACE/6 and specifies requirements for slip-on sleeves for the identification of aircraft electric
8、cables and insulated equipment wires. BS G198 is published in the following separate Parts. Part1: Specification for elastomeric sleeves for binding and identification; Part2: Specification for slip-on sleeves for identification purposes; Part3: Specification for heat-shrinkable sleeving for binding
9、, insulation and identification; Part4: Specification for fluoropolymer heat-shrinkable sleeving for binding and insulation; Part5: Specification for heat-shrinkable moulded shapes 1) . It is envisaged that there will be a further Part on heat-shrinkable dual wall sleeves. This Part is a revision of
10、 BS2G198-2:1982. It incorporates all amendments since the publication of BS2G198-2:1982, which is superseded and withdrawn. It refers to slip-on sleeves in a range of colours, diameters, and lengths suitable for identification of electric cables and insulated equipment wires in aircraft. The sleeves
11、 may also be used for other identification purposes, e.g.marking of pipe lines, but they are not suitable for binding. The sleeve type numbers used in British Standard2G198-2:1982 are retained in this revision. WARNING NOTE 1. This standard calls for the use of substances and/or test procedures that
12、 may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves either the supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. It is strongly recommended that users of this
13、 standard refer to BFPG Publication No.284/11. WARNING NOTE 2. When heated above260 C, PTFE will begin to degrade and the rate of degradation will increase with increasing temperature. The gases produced during degradation will vary according to the temperature and other conditions but will invariab
14、ly contain toxic components and good ventilation is therefore essential. WARNING NOTE 3. It is strongly recommended that users of this standard refer to BFPG Publication No.254/12. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
15、re responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to12, an inside back cover and a back cover. This standard h
16、as been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In preparation.BS3G198-2:1997 BSI 10-1999 1 1 Scope This Part of BS G198 specifies the design, performance, quality assurance requirements and me
17、thods of test for the following type of polytetrafluoroethylene (PTFE) slip-on sleeves suitable for identification of electric cables and insulated equipment wires in aircraft. The design of the sleeves is such that they do not expand in diameter. Type7. These are sleeves which, when fitted, are for
18、 use in the following temperature ranges: a) 65 C to250 C for at least20000h 2) ; b) up to300 C for at least168h 3) ; c) up to350 C for at least4h 4) . These sleeves are resistant to fuels, lubricants and hydraulic fluids, including ester-based lubricants and ester-based hydraulic fluids. NOTEThe la
19、test revision of an Aerospace Series standard is indicated by a prefix number. Recommendations for the storage of finished sleeves are given in Annex A. 2 References 2.1 Normative references This Part of BS G198 incorporates, by dated or undated reference, provisions from other publications. These n
20、ormative references are made at the appropriate places in the text and the cited publications are listed on page 12. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Part of BS G198 only when incorporated in the re
21、ference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative reference This Part of BS G198 refers to other publications that provide information or guidance. Editions of these publications current at the
22、 time of issue of this standard are listed on page 12, but reference should be made to the latest editions. 3 Information and requirements to be agreed and documented The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throu
23、ghout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified. a) the number of this British Standard (i.e.BS3G198-2:1997); b) the total quantity required; c) cut length, if required, (see8.2) and tolerance on cut len
24、gth, if the tolerance required is different from Table 3; d) whether the sleeves are to be tested in any further fluids in addition to those given in Table 7; e) codified identification (see12.1 note1); f) packaging requirements (see12.2); g) cleaning fluid (see Table 7); h) the dimensional requirem
25、ents, if non-standard (see8.2). 4 Materials 4.1 Sleeves shall be made from PTFE. No reprocessed polymer shall be used. 4.2 Overlays may be used to provide added protection for the sleeve or marking, provided the finished sleeves conform to the requirements of11. For the purposes of this standard the
26、 overlay shall be regarded as part of the sleeve. 5 Colour 5.1 The colour of type7 sleeves shall be translucent or recognizable as specified in BS6746C:1993. 5.2 The colour of sleeves shall be uniform and evenly dispersed throughout. 6 Finish The sleeves shall be smooth and free from bubbles, pinhol
27、es, creases and other defects that may affect performance. 2) The procedures described in BS5691-2:1995 for evaluation of thermal endurance are not readily applicable to PTFE. However, experience of product performance indicates that PTFE sleeving may be suitable for inclusion in systems for operati
28、on at temperatures upto260 C. 3) When assessed in accordance with11.12. 4) When assessed in accordance with11.5.BS3G198-2:1997 2 BSI 10-1999 7 Printing 7.1 When required, sleeves shall be indelibly printed with a character or legend to the specific requirements of the purchaser and such printing sha
29、ll not be affected by normal handling. 7.2 The printing shall be blue-black except on sleeves that would not provide adequate contrast. The characters shall be clearly printed, of uniform density and shall be legible with normal reading vision. The characters shall be underlined or have a dot follow
30、ing the legend when it is capable of being misinterpreted e.g.M. M W. W 6.6 9.9 The printing shall be longitudinal on the sleeve. (See Figure 1). 7.3 When sleeves are marked more than once, the printing shall be equally spaced around the sleeve. The characters shall be of a height such that the tota
31、l number of upper case characters shall cover at least25% of the circumference. Lower case characters shall be the same point size as the upper case characters. NOTE 1The preferred sizes and repetition of characters are given in Table 1. NOTE 2See clause3 for ordering procedure. 7.4 The production r
32、outine test for sleeves shall be25 strokes of tissue paper impregnated with isopropyl alcohol (IPA) after which the printing shall be legible with normal reading vision. Table 1 Size of printed characters Figure 1 Disposition of characters on identification sleeves Nominal internal diameter of sleev
33、e Nominal height of character Preferred number of times printed around periphery of sleeve mm 0.5to1.6 1.61to4.0 4.1to10.0 10.1to25.0 mm 2.0(1.6min) 2.5 4.5 6.0 1 2 2 4BS3G198-2:1997 BSI 10-1999 3 Table 2 Dimensions of type7 sleeves 8 Dimensions 8.1 The internal diameters and related wall thicknesse
34、s of the sleeves shall conform to the dimensions of Table 2. 8.2 Sleeves supplied to lengths specified by the purchaser shall, unless otherwise specified (seeclause3) be cut to the tolerances specified in Table 3. NOTEIf sizes and/or tolerances other than those specified in this standard are require
35、d, full details of the requirements should be specified by the purchaser in the contract or order (seeclause3). 9 Type testing 9.1 Type tests 9.1.1 The manufacturer or supplier shall provide details of the following: material composition; agreed techniques (including printing); and evidence, to the
36、satisfaction of the type approving authority, that sleeves supplied in accordance with this standard conform to the tests listed in Table 4 details of which are given in11. 9.1.2 Manufacturers/suppliers of printed sleeves shall demonstrate that the sleeves conform to all the material and printing re
37、quirements of this standard. Manufacturer/suppliers of unprinted sleeves shall demonstrate conformance to the material requirements. Certification to this standard shall indicate the scope of the manufacturers/suppliers and printers approval. 9.1.3 Type tests shall be performed on sizes taken from t
38、he top, middle and bottom of the manufacturer or suppliers range, unless otherwise indicated in Table 4. 9.1.4 In the event of a failure of the sleeves to conform to the requirements of a test, the batch shall be re-sampled and the test repeated using two further sets of test pieces. Both sets shall
39、 conform to the appropriate test requirements, otherwise the sleeves shall be deemed not to conform to this standard. Size code Internal diameter Wall thickness Nominal Actual Nominal Actual min. max. min. max. 01 mm 0.71 mm 0.62 mm 0.80 mm 0.25 mm 0.18 mm 0.32 02 03 04 05 06 07 08 09 10 11 12 0.89
40、1.02 1.14 1.27 1.40 1.58 1.73 1.91 2.16 2.41 2.72 0.80 0.93 1.02 1.15 1.28 1.46 1.61 1.79 2.04 2.29 2.60 0.98 1.11 1.26 1.39 1.52 1.70 1.85 2.03 2.28 2.53 2.84 0.30 0.23 0.37 13 14 15 16 17 18 19 20 21 22 3.05 3.43 3.84 4.29 4.83 5.44 6.07 6.81 7.62 8.53 2.93 3.28 3.69 4.14 4.58 5.19 5.82 6.56 7.37
41、8.28 3.17 3.58 3.99 4.44 5.08 5.69 6.32 7.06 7.87 8.78 0.38 0.31 0.45BS3G198-2:1997 4 BSI 10-1999 Table 3 Standard cutting tolerances for cut lengths of sleeves 9.1.5 No changes shall be made to the declared material composition and agreed techniques used in the production of the sleeves without the
42、 prior written agreement of the type approving authority. NOTEFollowing such changes, the type approving authority may require a repetition of type testing. 9.1.6 Type approval is valid for a period of5 years after which time the manufacturer or supplier shall apply for reapproval of the material. T
43、able 4 Type tests 9.2 Test conditions 9.2.1 Unless otherwise specified in a particular test, the tests shall be carried out under test conditions without control of humidity, at a temperature of(20 5) C. In the event of a dispute, tests shall be conducted at(23 2) C. 9.2.2 Conditioning The test piec
44、es and measurement gauges (if used) shall be conditioned for at least4h under the conditions specified in clause9.2.1 prior to testing. 9.2.3 A fan assisted air oven shall be used for heating unless otherwise specified. 10 Production routine and quality testing 10.1 Production routine tests Producti
45、on routine tests shall be applied to samples taken at random from every batch and shall consist of the tests listed in Table 5. Table 5 Production routine tests 10.2 Production quality tests The frequency of application of each production quality test shall be to the requirements of the Approving Au
46、thority and will depend on the maintenance of the basic formulation of the sleeve material and printing ink, and the manufacturing conditions, e.g.sintering. Production quality tests shall be applied to samples taken at random from batches and shall consist of the tests listed in Table 6. 10.3 Batch
47、 A batch of sleeves shall consist of those sleeves of the same type, nominal internal diameter and colour (printed if required) produced from a single mix, provided that the processing conditions are maintained constant throughout. Table 6 Production quality tests Cut length Tolerance mm 0to9.9 10to
48、24.9 25to49.9 50to99.9 100to149.9 150to249.9 250to1200.0 mm 0.5 1.0 1.5 3.0 4.0 5.0 12.5 Title Clause Finish Printing Dimensions Relative density a Resistance to heat Bending at low temperature Tensile strength and elongation at break Breakdown voltage c Volume resistivity Colour fastness to light a
49、bc Resistance to fluids ac Resistance to extremes of temperature c 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 11.11 11.12 a For the purposes of this test, one sleeve may be taken as representative of other sizes. b All colours are to be tested. c If the manufacturer/supplier intends to supply printed sleeves, only printed sleeves shall be tested. Title Clause Finish Printing Dimensions Resistance to heat 11.1 11.2 11.3 11.5 Title Clause Bending at low temperature Tensile strength and elongation
