when orienting fittings and valves it’s important to know that there are good methods and poor methods in this orientation process.remember that if pipes or features are parallel in the piping layout, they they’ll be parallel in the isometric view.the illustration shown above and on page 218 in your book shows the planes and possible positions of fittings & valves.with three planes, there are a number of ways for valves and fitting to be shown.there are three planes that exist in isometric drawings.coordinates should also be shown on the isometric drawing.dimensions MUST always be given to points of reference such as structures, existing equipment…etc.structural reference points that provide location can be shown on isometric.a north arrow give direction and should ALWAYS point to the upper-right corner of the paper.location and direction help to properly orient the isometric drawing.because of the lack of scale in an isometric, it’s IMPORTANT that the written dimensions are accurate Direction & location:.many companies draw isometrics on B-size paper (11” x 17”) which is a limited space so sometimes proportion may be sacrificed.
Isometrics also provide a drafter with the ability to calculate angular offsets in the pipe run.Isometrics are used as fabrication & shop drawings for pipe run fabrication.Sometimes it is used in lieu of plans and elevations but typically it is used to supplement the plan drawings.It’s popular within the process piping industry because it can be laid out and drawn with ease and portrays the object in a realistic view.
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