![]() ![]() Each view should serve a purpose and be used to communicate vital details.Īs with dimensioning, as few as possible views should be used only necessary items should be shown. There are several common views in mechanical engineering and manufacturing drawings. They condense the data into a smaller amount of space, for example, in a symmetric or continuous uniform component.Ĭut-out lines (two arrows joined by a dash-dot line) are used to show the cutting plane and trajectory of the cut out in a cut-out view. The measurement can sit on top or inside the lines.īreak lines (continual lines with intermittent zig-zags) indicate that a view has been broken. This can help reduce the number of dimensions and annotations on a drawing to prevent over detailing.Įxtension lines (two vertical lines joined by a double-headed arrow) annotate what is being measured. These are seen in instances such as showing an internal step in a turned part without the need for a section or cut-out view.ĭash-dot lines are used as center lines to indicate the center lines of a hole or show a part’s symmetric properties. ![]() The line thickness can vary, with the outer contours represented by thicker lines and the inner contours by thinner lines.ĭashed lines (also referred to as hidden lines) show something that would otherwise not be seen on the drawing. In simple terms, these lines draw out the object. – meaning not every line is equal.Ī continuous line (also referred to as a drawing line) represents an object’s physical boundary. Lines in an ED show both visible and hidden edges of a part, centerlines, etc. Several features describe a component, such as lines, views, and title-blocks. To find out more about specific standard PFD symbols, click here, and for P&ID symbols, click here. This is also known as a “Tag” identifier of a field device, which is normally given to the measurement’s location and function and identifies it’s on the same loop. This is followed by a loop number unique to the loop. To provide detail about the components, a 5 letter system is used: They are a standard set of symbols used for the identification of measurements and functionality within the process. PFDs use specific shapes to represent different equipment, valves, instruments, and piping flow in a system. Once you familiarise yourself with these features, you’ll be able to trace the lines in a system to understand specific components and the overall function in the case of PFDs and P&IDs or understand the manufacture and assembly of a product in the context of mechanical engineering. To read an ED, you must first become familiar with the various symbols, abbreviations, and diagram basics. They are far less detailed and shows the system overall.Įngineering Drawing Abbreviations and Symbols PFDs differ from P&IDs, showing a more general overview of a system. To find out how to draw P&ID, click here, and to understand how to mark up a drawing in real-time, click here. ![]() Permanent start-up, finish and bypass lines.Specific piping data can be read from a diagram, including: Process piping sizes and identification. ![]() Control instrumentation and designation.P&ID engineering drawings differ from the typical mechanical variant they include: Often models are used in conjunction with engineering drawings to show a good visual representation. Unlike a model, engineering drawings offer more specific detail and requirements, such as: How to Read an Engineering Drawing SymbolĮngineering drawings are simple to pick up and use – once you understand how to read them. In this post, we’ll go over the basics of how to read engineering drawing symbols. ![]()
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