Given the sheer amount of pumps, adding seal water lines would complicate things a lot. One alternative would be to draw the lines coming the pump that pumps the seal water, and just symbolize them "phasing out" of the drawing, and then drawing the seal water in- and outlets into the pumps, with a tag labelling it as seal water, and the outlets just phasing out of the drawing just like before.
The different lines of seal water could be enumerated, since given that the lines aren't actually shown, a way of knowing what lines go where is needed.
For lubrication oil, this issue is even greater, as there's even more equiptment that uses it, and there's a few temperature measurement instruments that need to be shown. Again however, the issue of readability arises; showing all of these lines would surely litter the diagram?
So, my question is this: are these auxilliary systems required to be shown (by ISO standards), and if so, how does one do this without littering the drawing? Perhaps one needs two drawings?
This one is drawn normally, though omitting seal water and lubricating oil lines.
This one contains the seal water and oil lines (and the instruments on those lines), plus the equiptment they go to, and only this equiptment.
Perhaps one could, with certain softwares (or with transparent drawing sheets), superimpose them to get the full drawing, in all of its messy glory?
