Instrument Layout is also known as instrument location plan. This drawing shows the exact position of each instruments with reference to plant layout.
The drawing shall detail:
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The point indication of instrument position and its mounting stand where instrument to be mounted and process tap location. Often the tap location and the instrument is separated quite distant. In some project, it is not mandatory to show the process tap location.
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Elevation information of instrument (and its mounting stand) and process tap.
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Junction box location including its elevation.
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Instrument Air Manifold location including its elevation.
Reference drawing: Piping plan, Isometric, P&ID
To prepare instrument layout, designer should obtain piping plan which will used as a background. Refer to Piping isometric and P&ID to verify the location of tapping point location.
Instrument shall be mounted on instrument stand at location as close as possible to the tapping point or at location where required by operator for ease maintenance/reading.
The purpose of Instrument Layout Drawing
Instrument layout derives other layout related to instrument discipline such as instrument cable layout and instrument tubing layout. In instrument cable layout, cable connecting instrument and junction box as well as cable connecting junction box and control room will be routed with reference to instrument layout drawing.
Likewise, the instrument which requires air supply such as control valves, actuated valves will have its tubing drawn in instrument tubing layout with reference to instrument layout drawing.
Example of Instrument Layout Drawing
Example of Instrument Layout Drawing.pdf (297.4 KB)