It is similar to a detail, assembly, or installation drawing, except that it presents pictorial, notational, or dimensional data to the extent necessary to convey the design solution used in preparing other engineering drawings. A selected item drawing defines refined acceptance criteria for an existing item under the control of another design activity which requires further selection, restriction, or testing for such characteristics as fit, tolerance, material (in cases where alternate materials are used in the existing item), performance, reliability, etc., within the originally prescribed limits. Organization 4. google_ad_width = 300; A two-point perspective is one of the most widely-used perspective drawings, as it gives a very realistic feel to the sketch. unless otherwise specified, (ii) elevation of equipment, (iii) all spare equipment, (iv) heat transfer equipment, pumps, compressor, etc., to be operated in parallel or in series (usually shown as one unit), (v) piping information such as size, orifice plates, strainers, and classification into hot or cold insulated of jacket piping, (vi) instrumentation not related to automatic control, (vii) instrumentation of trip system, (viii) drivers of rotating machinery except where they are important for control line of the process conditions, and (ix) any dimensional information on equipment, such as internal diameter, height, length, and volume. Engineering changes are incorporated into the latter drawing types to the extent that future production is to reflect the modifications. It includes (i) pictorial views, (ii) a wiring tabulation or reference to a wiring list which identifies wire numbers or colour codes, circuit reference designations, wire lengths, wire type and gauge, termination methods, and other related data, (iii) instructions for fabrication of the harnesses, minimum bend radii for conductors, and cross-references to the using assembly or installation drawings and associated electrical diagrams, (iv) parts list specifying parts (connectors, terminal lugs, etc.) It is prepared to provide maximum clarity in defining the part. The wiring list is a form of connection or interconnection diagram. It contains the details necessary to make or trace connections involved. required to mount assemblies in next higher assemblies or on foundations are included in the parts list of the drawing which define the attachment (usually the higher level assembly or installation drawing). Style Other types of lines are defined by the technique you are using: 1. These are described below. It is used to provide a means of establishing engineering requirements for the selection, qualification testing, and acquisition of an item, and documentation to assure interchangeability of specified items. Line drawings present themselves in a number of ways including outlines of objects, movement or density of objects and even erasing. It is an administrative type drawing which assigns unique identifiers which are compatible with automated data processing systems, item identification specifications, and provides a cross reference to the original incompatible identifier. required to produce the object code from the source code is also specified. (adsbygoogle = window.adsbygoogle || []).push({}); Except a few category of drawings (e.g. google_ad_height = 250; Technical drawings are also known as ‘engineering drawings’. Type of Lines. Depiction of the items in the assembly relationship, using sufficient detail for identification and orientation of the items. Zigzag 5. This is particularly because 2H contains a very light amount of lead. It establishes item identification for the controlled items. The seventh type is the logic circuit diagram. It is prepared to illustrate the functional relationship of major elements of an assembly, and system etc. A computer program drawing describes the design details, establishes item identification, and provides for control of the software it represents. A P&ID usually includes (i) instrumentation and designations, (ii) mechanical equipment with names and numbers, (iii) all valves and their identifications, (iv) process piping, sizes and identification, (v) miscellaneous such as vents, drains, special fittings, sampling lines, reducers, increasers and swagers etc., (vi) permanent start-up and flush lines, (vii) flow directions, (viii) interconnections references, (ix) control inputs and outputs, (x) interlocks, (xi) interfaces for class changes, (xii) seismic category, (xiii) quality level, (xiv) annunciation inputs, (xv) computer control system input, (xvi) vendor and contractor interfaces, (xvii) identification of components and subsystems delivered by others, and (xviii) intended physical sequence of the equipment. It is prepared to show the connection of wires and circuit elements at any level of assembly or installation. The drawing in itself does not provide complete design for which a detailed design drawing is needed. governing the original item. Continuous Thin Line . A contour definition drawing contains the mathematical, numeric, or graphic definition required to locate and define a contoured surface. looking at the drawing. The layout drawing is not generally used to fabricate equipment. Answer. A modification drawing describes changes to items after they have been delivered. Drafting students or those reading the drawings have to learn what they mean, just as one learns a new language. The drawing type permits the required alteration to be performed by any competent manufacturer including the original manufacturer, the altering design activity, or a third party. They describe typical applications and minimum content requirements. The Line type definition numbers are my own.

types of lines in technical drawing

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