1、BRITISH STANDARD BS 5070-1: 1988 Incorporating Amendment No. 1 Engineering diagram drawing practice Part 1: Recommendations for general principles UDC 744:003.63:62BS5070-1:1988 This British Standard, having been prepared under the directionof the General Mechanical Engineering Standards Committee,
2、was published under the authority ofthe Board of BSI and comes intoeffect on 29 February 1988 BSI 12-1998 First published as BS 5070, May1974 First revision as BS 5070: Part 1 February 1988 The following BSI references relate to the work on this standard: Committee reference GME/4 Draft for comment
3、84/75487 DC ISBN 0 580 15346 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Committee (GME/-) to Technical Committee GME/4 upon which the following bodies were represented: Amalgamated Union of
4、 Engineering Workers (TechnicalandSupervisorySection) British Engine Group of SMMT British Paper and Board Industry Federation British Railways Board British Standards Society Drawing Office Material Manufacturers and Dealers Association Electricity Supply Industry in England and Wales Electronic En
5、gineering Association Engineering Equipment and Materials Users Association Federation of Manufacturers of Construction Equipment and Cranes Gauge and Tool Makers Association Institution of Electrical Engineers Institution of Electronic and Radio Engineers Institution of Engineering Designers Instit
6、ution of Mechanical Engineers Institution of Production Engineers Ministry of Defence Post Office Society of British Aerospace Companies Limited Telecommunication Engineering and Manufacturing Association United Kingdom Atomic Energy Authority The following bodies were also represented in the drafti
7、ng of the standard, through subcommittees and panels: British Shipbuilders British Telecommunications plc GAMBICA (BEAMA Ltd.) Independent Broadcasting Authority British Coal Corporation Amendments issued since publication Amd. No. Date of issue Comments 8190 August 1994 Indicated by a sideline in t
8、he marginBS5070-1:1988 BSI 12-1998 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Principal types of diagrams 1 4 Drawing sheets 1 5 Principles of application 4 6 Lettering 9 7 Graphical symbols 10 8 Explanatory notes 10 9 Use of colour 11 10 Markin
9、g 11 Figure 1 Drawing sheets showing frame, title block other markings 3 Figure 2 Terminal points and lines entering and leaving a drawing sheet 5 Figure 3 Use of thicker lines for emphasis 7 Figure 4 Line identification 8 Figure 5 Line grouping 8 Figure 6 Single line representation on a multi-line
10、diagram 8 Figure 7 Indication of number of paths in single-line representation 8 Figure 8 Omitting lines 9 Figure 9 Connections entering and leaving in common line representation 9 Table 1 Recommended drawing sheet sizes (trimmed) 1 Table 2 Special elongated sheet sizes 2 Table 3 General types of li
11、nes 6 Table 4 Minimum character height for capital letters and numerals 9 Publications referred to Inside back coverBS5070-1:1988 ii BSI 12-1998 Foreword This Part of BS 5070 has been prepared under the direction of the General Mechanical Engineering Standards Committee and, together with Parts2 and
12、3 1) , supersedes BS5070:1974 which is now withdrawn. The 1974edition set out recommendations for drawing practice to be followed in preparing engineering diagrams in all fields of engineering with a view to securing uniformity between one drawing office and another in the same industry. It also aim
13、ed to increase uniformity between one field of engineering and another in the basic principles involved and in the designations for different types of diagram. Attention is drawn to BS5070 being a companion standard to BS308; the latter covers engineering drawing practice used in a wide range of eng
14、ineering disciplines. Commonly, as a diagram can be called a “drawing” and a drawing can be called a “diagram”, it is useful to summarize the difference in the scopes of these standards. BS308 covers what are commonly accepted to be drawings that define shape, size and form. BS5070 covers the drawin
15、g of diagrams that are normally associated with flow of one sort or another and which relate components (usually indicated by symbols) functionally one to another by the use of lines, but do not depict their shape, size or form; neither do they in general indicate physical connections or locations.
16、From experience with the 1974edition it was decided that for this first revision, whilst bearing in mind the long term aim of uniformity of conventions, there was a need for more comprehensive treatment of the varying requirements of differing industries and for more careful attention to their prese
17、ntation. BS5070 is therefore now revised in Parts by which the practice and conventions of several disciplines and industries are collected into three groups. Part1 covers general principles common to all subsequent Parts, which in turn deal particularly with electro-technology; control, flow and sy
18、stems; and logic. This standard gives recommendations for the drawing of engineering diagrams using the symbols given in relevant British Standards. It does not itself originate symbols. The diagrams in this standard contain symbols as they appear in the particular standards current at the time this
19、 publication was prepared. However, although every effort has been made to ensure that correct and current symbols have been used, it has to be recognized that the particular symbols standards are themselves subject to periodic review. It is therefore stressed that the relevant symbols standards, an
20、d not this standard, have to be consulted to obtain definitive symbols. The recommendations of this standard have been established having regard to the requirements of microfilming. Diagrams prepared in accordance with this standard should be suitable for microfilming and reduced-size reproduction t
21、echniques. During the course of this revision particular attention has been paid to developments in computer aided machine draughting and it has been established that such machines are currently capable of complying with this standard. Any minor exceptions due to the limitations of a particular syst
22、em would not be expected to prejudice the understanding of a diagram otherwise claimed to comply with this standard. It is recognized that though this standard is published in a number of Parts, there may be instances when certain recommendations and descriptions are repeated. This has been kept to
23、a minimum and it is hoped that all the needs of any specialized engineering discipline are contained in the Part of this standard that deals with those specific needs. 1) An additional Part4 is also in preparation.BS5070-1:1988 BSI 12-1998 iii This Part of this standard deals with general principles
24、 of diagram drawing including types, basic preparation and presentation. It is the base document from which the other Parts are developed. Part3 of this standard deals with a variety of non-electrical diagrams including those concerned with control and flow; transfer of materials (both solids and fl
25、uids, i.e. liquids, vapours and gases); and energy transfer (hydraulic, pneumatic and mechanical). Part4 of this standard deals with logic diagrams. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
26、 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, pages i to iv, pages1to 12, aninside back cover and a back cover. This standard has been updated (see copyright d
27、ate) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS5070-1:1988 iv BSI 12-1998 Notes on the presentation of this standard NOTE 1The figures illustrating the text in this standard are independent and each is selected solely for its s
28、implicity and clarity to illustrate only the text to which it relates. They are not the only possible examples and they are not intended as design examples or to be full working diagrams, but otherwise are drawn according to the basic recommendations of this standard. NOTE 2Numerical values of compo
29、nents given in the figures throughout are arbitrarily chosen to assist in illustrating the point under consideration; they are typical and are not given as recommendations. NOTE 3In the figures in this standard, a convention is adopted of using capital letters for notes that would appear as part of
30、the drawing and lower case letters are used for notes explaining the point under consideration in relation to the text. An exception to this may be found in some diagrams where unit symbols are customarily written in lower case.BS5070-1:1988 BSI 12-1998 1 1 Scope This Part of BS5070 gives recommenda
31、tions for the general principles of presentation and practice to be applied to engineering diagrams of all types that depict by the use of graphic symbols the function of a system or the relationship between components and parts. Other Parts of this British Standard give recommendations and specific
32、 definitions that are appropriate to particular engineering disciplines. Electrotechnology diagrams are not covered. NOTE 1The relevant Part of BS5775 should be complied with for the correct application of units and symbols for quantities. NOTE 2The titles of the publications referred to in this sta
33、ndard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS5070 the following definitions apply. 2.1 line a graphic convention showing how devices (represented by symbols) are connected. A variety of types of line, some with embellishments, are used to represent conn
34、ections having different functions 2.2 symbol a symbolic graphic convention representing a discrete manufactured device contributing to the function of a system or circuit 3 Principal types of diagrams This standard deals with the presentation and practice to be used in the production of diagrams. F
35、or the purpose of this standard a diagram is defined as a drawing that shows symbols connected by lines. The symbols usually depict function rather than physical shape and the diagram depicts a fluid type flow. Different engineering disciplines use a variety of diagrams that fall within the bounds o
36、f the above description and within each discipline there are different types of diagram each with a specific purpose. Each Part of this standard covers a particular field of engineering and particular types of diagram are defined within those Parts. The following list shows the different types of di
37、agrams covered by Parts 3 and 4 of this standard. The relevant Part carries definitions of each type of diagram together with specific uses and recommendations for that diagram in that field of engineering. Part 3 (Mechanical/fluid flow diagrams) Block diagram Flow diagram Circuit diagram (fluid) Pi
38、ping/system diagram Piping and instrumentation diagram installation diagram Supplementary diagram Part 4 (Logic) 2)Logic diagram Logic circuit diagram 4 Drawing sheets 4.1 Sizes 4.1.1 General. It is recommended that ISOAseries drawing sheet sizes be used as specified in BS3429. The sizes of these sh
39、eets are given inTable 1. Sizes larger than A0 should be exceptional. Table 1 Recommended drawing sheet sizes (trimmed) 4.1.2 Selection of drawing sheet size. The choice of drawing sheet size should be decided after taking into account the following points: a) the volume and complexity of the design
40、; b) the requirements of handling and filing; c) the level of knowledge of the user; d) the environment of use; e) the requirements of computer aided design (CAD); f) the limitations of reduced-size reproductions. 4.1.3 Multi-sheet diagram. All sheets of a multi-sheet document should be numbered in
41、such a manner that will relate them to one another by: a) including the number of sheets on the first sheet and not on subsequent sheets; or 2) Logic systems powered by electrical energy are covered by BS EN 61082-1. Designation Size Minimum border width from drawing frame to edge of sheet mm mm A0
42、841 1189 20 A1 594 841 20 A2 420 594 10 A3 297 420 10 A4 210 297 10BS5070-1:1988 2 BSI 12-1998 b) including the number of sheets on every sheet, e.g. sheet1of5 or sheet 3of5; or c) an index sheet or drawing list. 4.1.4 Elongated sheet sizes. When a sheet of greater length is needed, one of the sizes
43、 given inTable 2 should be used. Table 2 Special elongated sheet sizes 4.2 Formats 4.2.1 General. Drawing sheets have two formats as follows. a) Landscape: intended to be viewed with the longest side of the drawing sheet horizontal, seeFigure 1(a). b) Portrait: intended to be viewed with the longest
44、 side of the drawing sheet vertical, seeFigure 1(b). 4.2.2 Trimming marks. Trimming marks may be provided in the borders at four corners of the sheet in order to facilitate trimming. These marks can be in the form of right-angled isosceles triangles or alternatively two short strokes at each corner
45、3)(seeFigure 1). 4.2.3 Borders and frames 4.2.3.1 General. It is recommended that all sheets should include a frame to enclose the drawing area together with the title block and other standard information. The frame should be symmetrical with the edges of the sheet. The minimum widths of these borde
46、rs are shown inTable 1. In the majority of cases the values shown are sufficiently large to allow for gripping during printing. The frame should accommodate such marks as are necessary for microfilming procedures as given in BS5536 and other reduced-size reproduction techniques. 4.2.3.2 Frame lining
47、. Lines forming the frame should be continuous and of a minimum thickness of0.5mm. 4.2.3.3 Grid system or zoning. The provision of a grid reference system is recommended for all sizes of drawing sheets, in order to permit easy location on the drawing of details, changes, etc. The number of divisions
48、 should be divisible by two and be chosen in relation to the complexity of the drawing. It is recommended that the length of any side of the rectangles comprising the grid should not be less than 25mm and not more than 75mm. The grid reference system lines should be drawn as short lines of 0.5mm min
49、imum thickness (seeFigure 1). The rectangles of the grid should be referenced by means of capital letters down the vertical edges beginning at the top and numerals along the horizontal edges beginning at the left-hand side of the sheet. The references may be repeated on the opposite sides. The letters and numerals should be placed in the borders, close to the frame at a minimum distance of5mm from the edges of the trimmed sheet, and should be written in upright characters (seeFigure 1). 4.2.3.4 Centring marks. Centring marks should be
