1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MENYHAPOAHAR OPrAHM3AuMR il0 CTAHAAPTM3AL(MM Aerospace - Pipelines - Identification Aronautique et espace - Tuyauteries - Identification I IS0 12 Second edition 1987-05-01 Reference num
2、ber IS0 12: 1987 (E) 12-87 IS0 (the International Organization for standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a sub
3、ject for which a technical committee has been established has the right to be represented on that committee, International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circul
4、ated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodiesvoting. International Standard IS0 12 was prepared by Technical Committee ISO/TC 20,
5、Aircraft and space vehicles. This second edition cancels and replaces the first edition (IS0 12 : 19761, which has been technically revised as follows: - the scope and field of application has been modified; - a symbol has been added for filtered air (see table 1 and figure 2); - sub-clause 3.3 (now
6、 4.3) on the supplementary identification marker has been expanded. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. I 0 International Orga
7、nization for Standardization, 1987 O Printed in Switzerland I INTERNATIONAL STANDARD IS0 12 : 1987 (E) Aerospace - Pipelines - Identification 1 Scope and field of application This International Standard lays down the requirements for a scheme to indicate, by appropriate marking, the functions or con
8、tents of rigid pipe assemblies in aircraft and spacecraft systems, but excluding those in aero-engines with the excep- tion of those which connect directly to the airframe systems at their break points. These requirements may also be applied to hose assemblies, if desired. The purpose of the scheme
9、is to provide the minimum iden- tification necessary for normal maintenance purposes. NOTE - Markers used for the purpose of applying this identification scheme should not adversely affect the chemical or mechanical proper- ties of the pipes or conduits. 2 Reference IS0 3323, Aircraft - Hydraulic co
10、mponents - Marking to indicate fluid for which component is approved. 3 Identification scheme 3.1 General 3.1.1 Where ambient temperatures permit, the scheme shall consist of markers fixed to the pipelines to indicate their func- tions or contents, to give due warning where the contents are dangerou
11、s and, when required, to indicate the direction of flow of the contents. Typical applications of the scheme are shown in figure 1. Any supplementary identification required should be separate and distinct from the lettering, symbols and colours specified in this International Standard. It is recomme
12、nded that such sup- plementary identification should be by means of a number code see figure 1d)l. 3.1.2 Where ambient temperatures are too high to permit the use of mark,ers, the requirements of this International Standard shall be met as fully as possible. As a minimum requirement, one inscription
13、 in black letters, located in accordance with clause 5, shall be applied ih such a manner that it remains legible throughout the temperature range imposed on the pipeline. 3.2 Basic identification 3.2.1 Each rigid pipe in the pipe systems listed in table 1 shall be identified by a marker bearing the
14、 designation of the system, together with the appropriate symbol as described in table 1 and shown in figure 2. 3.2.2 Pipelines for replenishment, vents, pressure transmis- sion, priming and drains, or related functional equipment, shall be identified by the same marker as the main pipeline. Table 1
15、 - Pipe systems and symbols Designation of pipe system Air conditioning (including cabin pressurizing) Battery activator Breathing oxygen Compressed gas Coolant De-icing Drinking water Electrical conduit Filtered air Fire protection Fuel Hydraulic Inerting Instrument air Lubrication Monopropellant R
16、ain repellent Pneumatic Rocket catalyst Rocket fuel Rocket oxidizer Solvent Vacuum Waste watet Water injection Symbol (see figure 2) Description Dot pattern Ellipse with radiating lines Rectangle Broad diagonal stripe Broad undulations Triangle11 “H2O“ Flash of lightning “NBC“ Horizontal diamond Fou
17、r-pointed star Circle Pipe cross11 Zig-zag line21 Square 1) Block T Falling raindrops “XZI Three vertical stripes21 Four-pointed star inside crescent . Crescent Horizontal stripes Wavy line21 Chain21 Chevron 1) Alternate symbols to be staggered. 2) Continuous pattern. No. 11 24 10 16 9 13 25 17 27 1
18、2 1 6 19 8 5 21 22 7 15 3 2 20 23 26 4 IS0 12 : 1987 (E) 3.2.3 The contents of pipelines other than those listed in table 1 (e.g. toilet) shall, where necessary, be identified by markers bearing the name of the function or contents only. 3.3 Supplementary identification 3.3.1 Sub-division of basic i
19、dentification Where necessary for the further identification of a pipeline, a basic identification shall be sub-divided by means of additional words, describing the specific function or contents of the sub- division (e.g. “Methyl bromide“, “Auto-pilot“), which may be on a second, narrower marker adj
20、acent to the basic identifica- tion marker or interposed between the words on the latter see figure le), 3.3.2 Warning symbol Markers bearing the skull and crossbones symbol, as shown in figure 2 (No. 14), shall be applied adjacent to the basic iden- tification markers on all pipelines where it is n
21、ecessary to in- dicate that the contents of the pipelines are considered to be dangerous to maintenance personnel. 3.3.3 Direction of flow When required, the direction of flow of the contents of a pipeline shall be indicated by means of additional markers bearing arrows, as shown in figure 2 (No. 18
22、). 4 Markers 4.1 General Except as laid down in 4.2.2 and 4.3.2, all lettering and sym- bols shall be printed in black upon a white or equivalent background. If desired, alternate lines or, where appropriate, pairs of lines of the lettering may be inverted. 4.2 Basic identification marker 4.2.1 The
23、basic identification marker shall be not less than 25 mm wide and shall bear a) the appropriate symbol, at regular intervals or forming a continuous pattern (see figure 2) in a band approximately 7 mm wide on one margin of the marker; b) the designation of the pipe system, in lettering not less than
24、 3 mm high, repeated at regular intervals such that the gap between the lines is not more than twice the height of the lettering, on the portion of the marker not used for the symbol. 4.2.2 If desired, the background to the written description may be coloured, in which case the colouring shall be as
25、 shown in figure 2. The colours shall have the colorimetric values given in table 2 and shall not be of such density as to obscure the lettering, Where there is more than one colour, the widths of the bands shall be approximately equal. Table 2 - Colorimetric values of colours Colour A) Blue BI Gree
26、n C) Yellow ID) Brown E) Orange FI Red GI Grey Chromaticity coordinates and luminance factor under CIE* Standard Illuminant B Value x 0,201 0,366 0,483 0,506 0,620 0,645 0,342 Value y 0,188 0,510 0,488 0,386 0,356 0,316 0,363 % 8.8 14.3 62.3 3.3 16.2 7.7 29,l * Commission internationale de lclairage
27、 International Commission on Illumination) 4.3 Supplementary identification marker 4.3.1 A marker used for supplementary identification pur- poses (see 3.3) shall be not less than 12 mm wide and shall bear either a) the appropriate symbol at regular intervals, as shown in figure 2 (Nos. 14 and 181,
28、or b) the desired inscription, in lettering not less than 2 mm high, repeated at regular intervals such that the gap between the lines is not more than twice the height of the lettering. 4.3.2 Where a supplementary identification marker is used to indicate the type of fluid for which a hydraulic sys
29、tem pipeline is approved, the inscription shall be the name of the particular type of fluid as specified in IS0 3323. Where IS0 3323 makes provision for the use of a colour to indicate a particular type of fluid, the background to the written inscription may be coloured, if desired, in which case th
30、e colour used shall be that specified in IS0 3323 for that particular type of fluid. 4.4 Identification For purchasing and handling purposes, the markers shall be identified by the number of the relevant national standard together with the appropriate symbol number as shown in table 1 and/or figure
31、2. IS0 12 : 1987 (E) 5 Location of markers Markers shall be located at both ends of a pipeline component and at intervals along the pipeline. Identification points shall be selected so that when the pipeline is installed at least one marker is located adjacent to each servicing point and inspec- tio
32、n door. Where a length of pipeline is less than 600 mm and the installed pipeline may be readily traced, only one marker need be used. To preclude over-application of markers, discretion may be exercised when implementing these requirements. Where visi- bility is unrestricted over a one-piece pipeli
33、ne of considerable length, the markers need only be placed at intervals necessary to ensure that at least one marker is visible and recognizable from any observation point along the pipeline. a) Fuel COMPRESSED rru-n c) Compressed gas - warning METHYL BROMIDE zlu PROTKTION b) Fire protection - methy
34、l bromide Constructors marking (A) (C) HVDRAULIC d) Hydraulic - with supplementary identification e) Positioning of markers showing alternative methods of giving supplementary information (see 3.3.11 NOTES 1 The letters above the markers are the serial letterc of the colours as given in table 2. 2 T
35、he supplementary identification marker may be located on either side of the basic identification marker (see 3.3.1). Figure 1 - Typical applications of markers IS0 i2 : 1987 (E) BHEATHING BREATHING OXYGEN - DE DE DE DE DE - ( F) 1 (Cl LUBRICATION 5 COOLANT COOLANT COOLANT 9 (GI -ICING -ICING A -ICIN
36、G A -ICING A Y *ICING 13 Ir, U 14 Warning symbol 12-87 I 4851903 0019152 T (Cl (BI 15 (FI (GI 3 16 IWSTR MENT INSTR MEHT INST MENT PROTKTION 12 17 NOTES 1 The letters above the markers are the serial letters of the colours as given in table 2. The numbers below the markers are the symbol numbers for
37、 identification purposes. 2 The symbol may be located on either margin of a marker see 4.2.lail. Figure 2 - Identification symbols and colours 23 19 e o e (Cl (GI 24 20 (A) (6) W$ER IH,OI 25 21 (FI (A) 31 WA TE 26 IS0 12 : 1987 (E) (A) (GI I RdiN Il REP LENT REiihT 46 “ R IN 44 REPE LENT44 22 (6) (F
38、I FILT RED 3 pj& 27 NOTES 1 The letters above the markers are the serial letters of the colours as given in table 2. The numbers below the markers are the symbol numbers for identification purposes. 2 The symbol may be located on either margin of a marker see 4.2.lall. Figure 2 (concluded) .-_I- 12-87 -# 4851703 0017154 r UDC 621.643.2 : 629.7 : 003.62 Descriptors : aircraft, aircraft equipment, pipelines, designation, marking. Price based on 5 pages
