Hi Paul...
Finally!....something I can comment on. In my business (water and wastewater), we begin a project by fleshing out the PFDs. Then, as the design process gets more involved (and more people get involved) the P&IDs are established by Control Systems Engineers, not, god forbid, the good folks that take care of our Windows and Microsoft applications.
Jack
Don't forget that a P&ID is also useful so that there is some sort of planning involved in what you want to do and which fluids you are expected to transmit. For those that are *really* good, all they need is a PFD and a pencil (and a lot of background knowledge). Even more brilliant are those people who come up with an innovative process related to fluids and design and build it all by themselves. A lot of these people are, um, "no longer with us" due to their lack of safety precautions.
Step one is learning how to read and understand a P&ID.
Which leads me to this question for the really experienced guys out there: based on a PFD and an understanding of the process, could you create a P&ID yourself? Does the computerized logic for plant/process control come from the computer programmers/IT department or the engineers?
A real tough question for this group, I'll bet.
Paul
> you mean to find out for discharge of the pipe.
> Generally pipes are designed for quantity of discharge.
> Discharge=area*velocity
> velocity will effect your friction inside the pipe(friction is
proportional
> to square the velocity of the fluid).If you want to go for less
velocity
> then you must choose large diameter pipes.
> once you decide your diameter for particular discharge then pressure
will
> decide your thickness of the pipe,means which schedule pipe you want
to use
> for particular case.
> all above considerations are primary.
> If you want to calculate exact diameter and thickness you must
consider all
> elbow,fittings ,contraction and expansion losses as well as work done
on
> the fluid for moving fluid from place to place then only you will get
exact
> dimensions of the pipes.
> hope this may help you.
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[Non-text portions of this message have been removed] Received on Thu Apr 01 10:00:00 2004
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