Standard A3 size isometric sheets shall be used for an isometric drawing.Dimensions of valve, flanges, fittings etc.General arrangement of control valve stations, utility stations etc.Standard specifications – Typical standards & connecting details of the instruments to measure flow, pressure, temperature & level.
Standards for isometric symbols & Bill of Materials.The following data are required to prepare an isometric drawing. This detailing is required for the easiness in fabrication and erection at site. Isometric drawings of pipe lines are prepared to further detail the pipe line. The box technique is also known as the coordinate technique. The box technique is the most common construction technique. On isometric planes, circles in principal orthographic views turn to isometric ellipses and arcs appear as partial isometric ellipses This is done by drawing the lines parallel to isometric axes.
It is quite easy creating isometric lines on isometric planes. Construction Techniques for Isometric Drawing Drawing an isometric proportionally simply means drawing a 10M run of pipe twice as long as a 5M length of pipe. This information is conveyed through the use of callouts and notes placed on the drawing.Īlthough piping isometrics are not drawn to scale, it should be drawn proportionally. No attempt is made to represent a pipe’s actual size or pound rating graphically. Isometric symbols for fittings, flanges, and valves represent all sizes of pipe. Isometrics are also drawn as a schematic, which means they are not drawn to scale. The isometric must provide a detailed description of the pipe’s routing from beginning to end. Piping isometrics are typically drawn in single lines irrespective of the pipe’s size, with each pipe line drawn on a separate sheet. Most engineering and construction companies draw a piping isometric of every piping configuration to be installed in the facility. Once drawn and properly dimensioned, isometrics are provided to fabricators who will build each piping configuration.Īfter configurations are fabricated, isometrics serve as an aid to the construction and erection of the facility by providing workers with the locations of tie-ins, connections, and routings Isometrics are also used by many companies as fabrication drawings. Piping material take off is generated from isometrics in which each individual component that makes up a pipe configuration is tabulated for purchase or procurement. Isometrics in a single view provide a pictorial representation of the height, width and depth dimensions in a single view to provide a pictorial representation. In isometric drawings, the three principal axes make equal angles with the image plane. Starting with the camera aligned parallel to the floor and aligned to the coordinate axes, it is first rotated downwards around the horizontal axes by about 35.264° as above, and then rotated ±45° around the vertical axis.An isometric drawing is one of three types of axonometric drawings they are created based on parallel projection technique. In a similar way an isometric view can be obtained for example in a 3D scene editor. There is isometric paper that can be placed under your normal piece of drawing paper as an aid. Note that with the cube (see image) the perimeter of the 2D drawing is a perfect regular hexagon: all the black lines are of equal length and all the cube's faces are the same area. Next the cube is rotated ±45° about the vertical axis, followed by a rotation of approximately ☓5.264° (precisely arcsin(tan 30°) or arctan(sin 45°) ) about the horizontal axis. For example when taking a cube, this is done by first looking straight towards one face. You may want to review the Wikipedia entry on isometric projection to get some inspiration regarding the numbers you seek:Īn isometric view of an object can be obtained by choosing the viewing direction in a way that the angles between the projection of the x, y, and z axes are all the same, or 120°.
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