piping isometric drawing symbols autocad

In the image below the true north is at 18°. In principle, with a simple reliable compass the direction of the magnetic north can to be determined. You'll find a lot of information about how reference points are measured and identified.ĭefining a starting point of the site related to the North / South direction, is one of the first steps in setting up a coordination system. search on the Internet on geographic coordinate conversion, triangulation stations, benchmarks, geography or topography. In the Netherlands, for example, are thousands of official reference points, distributed across the country. A coordination system, which refers to an officially recognized point therefore is necessary. Without consensus on these things, communication of the location of a Process Plant becomes unclear.īefore beginning with making drawings for a new process plant or building, there must be determine where the new building in the area will take his place.

Several things are assumed to be known, the place to begin (General Service Building), and understanding of east and south (reference directions), and the length of a block (unit of displacement). With this illustration, a direction and a distance from the General Service Building has been established. To be more specific, the Heat Exchanger is four blocks east and three blocks south of the General Service Building. Reference Points Location is RelativeĪn object's location is always given relative to another reference object.įor example, the location of a Heat Exchanger may be described as five blocks from the General Service Building.

Piping isometric drawing symbols autocad