I would have a fit if the IT Dept did my control design! They might
know computers and networks and programming, but they don't know
processes. That said, I don't do my P&ID development in a vacuum. I
work with controls integrators who have good ideas themselves, and they
keep up with technology of controls better than I do (hopefully I have
other things to do). But then, I run into a lot of process and design
people who have no idea about controls, and they might just turn it over
to anyone who can use a little bit of jargon.
... Bruce D. Bullough ...
Sebesta Blomberg & Associates
2381 Rosegate
Roseville, MN 55113 USA
651-634-7344 direct
651-634-7400 FAX
www.sebesta.com
-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com]
Sent: Wednesday, March 31, 2004 11:08 PM
To: <a href="/group/PipingDesign/post?postID=fZdqerFVl6NpbDR4_mjwzF6tGivjYHRn-EFyCzBgQBjg0l6QS8VvvioqcpX5L1bQhxOuOthx0m6J1pzeveL9e2zm">PipingDesign@yahoogroups.com</a>
Subject: Re: [PipingDesign] pipe size calculation [P&IDs]
[bcc][faked-from][bayes]
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.
Yahoo! Groups Links Received on Thu Apr 01 10:04:00 2004
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:33 EST