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How about Piping symbols? Valves, pumps, heat exchangers, boilers, chillers, etc. It would be helpfull for making sketches for installs that the crew/engineers could understand.
Here are a couple of examples
http://www.roymech.co.uk/Useful_Tabl...ow_sheets.html
http://en.wikipedia.org/wiki/Piping_and_instrumentation_diagram