Instrument Hook-up Drawing
Instrument Hook-up Drawing
Hook-up drawing indicates tubing slopes, position of instrument in reference to process tapping point, scope break between instrument vs piping.
Hook-up drawing also gives information the requirement of bulk material for each installation. It also details its specification (size, type and material) and the quantity.
There are two types of hook-up drawing:
Process Hook-Up
This hook-up drawing contains typical installations for instrument which connects to the process
Pneumatic Hook-Up
This hook-up drawing contains typical installations for instrument which requires instrument air such as control valve, actuated valve
Reference drawing: P&ID, Installation Detail Specification, Piping Specification P&ID tells the designer which instrument requires a hook-up drawing. A good designer can also read whether the instrument tapped in gas service or liquid service.
Battery limit between instrument and piping shall be made clear, this is stated in P&ID symbol and typical sheet or piping documents.
Installation detail specification will also specify items that should be utilized and factor that should be considered in one installation
The purpose of Instrument Hook Up Drawing
As stated earlier, information of the requirement of bulk material is stated for installation on each sheet hence the bulk material required for the whole drawings could be summarized and tabulated in a document named Material Take Off.
During project construction phase, this drawing is also referred as a guidance of how to install the instrument properly.
Check this website for original post and more info :
http://instrumentationportal.com/2011/document-drawing-checklist-form/instrument-drawing/instrument-hook-up-drawing/
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