1、W 3404589 0109754 790 BRITISH STANDARD Technical drawings - Simplified representation of pipelines Part 2. Isometric projection The European Standard EN IS0 6412-2 : 1994 has the status of a British Standard ICs 01.100.20; 23.040.90 BS EN IS0 BS 308 : Section 4.7 : 1995 6412-2 : 1995 3404589 0309755
2、 627 m BS EN IS0 6412-2 : 1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1995 O BSI 1995 Committees responsible for this British Standard The prepdon of
3、 this British Standard was entrusted to Technical Committee “DW4, Engineering drawing practice, upon which the following bodies were represented Atomic Weapons Estabiishment British Gas plc British Standards Society Drawing Ofnce Materiai Manufacturers and Deders Association Electricity Association
4、Gauge and Tool Makers Association WAC Association Institution of Chemical Engineers Institution of Engineering Designers Power Generation Contractors Association Society of British Aerospace Companies Lt. University of Warwick Amendments issued since publication Amd.No. ID 23.040.90 Descriptors: Pip
5、elines, drawings, technical drawings English version Technical drawings - Simplified representation of pipelines - Part 2: Isometric projection (Is0 6412-2 : 1989) Dessin techniques - Reprsentation simplifie des tuyaux et lignes de tuyauteries - Partie 2: Projection isomtrique Technische Zeichnungen
6、 - Vereinfachte Darstellung von Rohrleitungen - Teil 2: Isometrische Darstellung (Is0 6412-2 : 1989) (Is0 6412-2 : 1989) This European Standard was approved by CEN on 199410-14. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this Eu
7、ropean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (Engli
8、sh, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Fi
9、nland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050
10、Brussels O 1994 Copyright reserved to CEN members Ref. No. EN IS0 6412-2 : 1994 E 3404589 0309759 272 Page 2 EN IS0 6412-2 : 1994 Foreword This European StandaMi was taken over by CEN from the work of ISOITC 10, Technical drawings, product denition and related documentation, of the International Org
11、anization for Standardization (ISO). The Technicai Board had decided to submit the final draft for Formal Vote. The result was positive. This European Standard sha be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 1995, a
12、nd conflicting national standards shall be withdrawn at the latest by April 1995. According to the CENKENELEC Internal Regulations, the following countries axe bound to implement this European Standard Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Itay, Luxembourg, N
13、etherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. NOTE Normative references to international publications are listed in annex ZA (normative). Introduction For drawings for tender, manufacturing drawings and erection drawings in pipeline construction as well as in machine cons
14、truction and the construction industry, isometric projection has been introduced to a great extent, since the drawing work can be cut down and the presentation made clearer. For the purposes of this part of IS0 6412, all dimensions and tolerances on the drawings have been stencilled in upnght letter
15、ing. It should be understood that these indications could just as well be written in free-hand or inclined (itaiic) lettering without altering the meaning of the indications. For the presentation of lettering reportions and dimensions), see IS0 6412-1. 3404589 0309760 T4 Page 3 EN IS0 6412-2 : 1994
16、Technical drawings - Simplified representation of pipelines - Part 2 : Isometric projection 1 Scope This part of IS0 6412 specifies supplementary rules, in addition to the general rules given in IS0 6412-1, applicable to isometric representation. Isometric representation shall be used where the esse
17、ntial features are to be shown clearly in three dimen- sions. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 64412. At the time of pubiication, the editions indicated were valid. All standards are sub
18、ject to revision, and patties to agreements based on this part of IS0 6412 are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and IS0 main- tain registers of currently valid International Standards. 3 Definitions For the p
19、urposes of this part of IS0 6412, the definitions given in IS0 6412-1 apply. 4 Coordinates As far as it is necessary to use Cartesian coordinates. for instance for calculations or numerical control of machine tools, the coordinate axes shall comply with figure 1. In all cases, the coordinates of ind
20、ividual pipes or pipe assemblies should comply with those adopted for the complete installation and shall be indicated on the drawing or in an associated document. Z 1 IS0 128 : 192, Technical drawings - General princip/es of presenta tion. IS0 129 : 1985, Technicaldrawings - Dimensioning - General
21、principles, definitions, methods of execution and special indica- tions. IS0 5261 : 1981, Technical drawings for structural metal work. IS0 6412-i : 1989, Technical drawings - Simplified represen- tation of pipelines - Part 1: General rules and orthogonal representation. Figure 1 5 Line conventions
22、See IS0 6412-1. 3404587 OL077bL 720 Page 4 EN IS0 6412-2 : 1994 6 Deviations from the direction of coordinate axes 6.1 General Pipes, or pa- of pipes, running parallel to the coordinate axes, shall be drawn parallel to the relevant axis without any further indication. Deviations from the directions
23、of the coordinate axes should be indicated by means of auxiliary hatched projection planes as shown in figure 2. Figure 2 al 6.2 Pipes in a vertical plane Pipes, or parts of pipes, situated in a vertical plane, shall be indicated by showing their projections on a horizontal plane see figure 3a)l. 6.
24、3 Pipes in a horizontal plane Pipes, or parts of pipes, situated in a horizontal plane, shall be indicated by showing their projections on a vertical plane see figure 3b)l. 6.4 Pipes not parallel to any coordinate plane Pipes, or parts of pipes, not running parallel to any coordinate plane, shall be
25、 indicated by showing both their projections on a horizontal and on a vertical plane see figure 3c)l. 6.5 Auxiliary projection planes It is recommended that the right angles of the triangles limiting the auxiliary projection planes be indicated. Auxiliary projection planes may be emphasized by hatch
26、ings, parallel to the X- or Y-axis for horizontal auxiliary planes. and vertical for all other auxiiiary planes. b) Figure 3 Page 5 EN IS0 6412-2 : 1994 if such hatching is not convenient it may be omitted, but in that case the rectangle (see figure 4) or the rectangular prism (see figure 5). of whi
27、ch a diagonal coincides with the pipe, should be shown, using continuous thin lines (type B, IS0 128). 7.3 Longitudinal and angular dimensions Longitudinal and angular dimensions should be indicated in accordance with IS0 129; the length shall start from the outer faces of the pipe ends, flanges, or
28、 centre of the joint, whenever / appropriate. 7.4 Pipes with bends Pipes with bends shall be dimensioned from central line to central line or from the central line to the end of the pipe (ee figure 61. Figure 4 Figure 6 7.5 Radii and angles of bends Radii and angles of bends may be indicated as show
29、n in figure 7. The functional angle shall be indicated. Figure 5 7 Dimensioning and special rules 7.1 General Drawings shall be dimensioned in accordance with IS0 129. There are, however, special rules for isometric projection for pipelines which are specified in 7.2 to 7.10. 7.2 Diameters and wall
30、thickness The outer diameter (d) and the wall thickness (1) of pipes may be indicated in accordance with IS0 Q61 (see figure6). Nominal dimensions may be indicated in accordance with IS0 3545 using the short designation “DN“ (see IS0 6412-1 : 1989, figure 1). NOTE - Bends may be simplified by extend
31、ing the straight length of the flow line to the vertex. However, the actual bends in the pipes may be shown for sake of clarity. In this case, if projections of bends would otherwise have been elliptical, these projections may be simplified by drafting circular arcs. Figure 7 3404589 0109763 7T3 Pag
32、e 6 EN IS0 6412-2 : 1994 7.6 Levels 7.9 Redundant dimensioning Levels should be indicated in accordance with IS0 129 and IS0 6412-1 (see figure 81. If nece-b, the auxiliaV hatched Projection Planes can be dimensioned (see figure 101. The horizon Fax: 0181 996 7001. In response to orders for internat
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