Re: pipe size calculation [P&IDs]

From: <Jack>
Date: Thu Apr 01 2004 - 10:00:00 EST

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

• Original Message -----
  From: Paul Bowers
  To: <a href="/group/PipingDesign/post?postID=jFSdKCjRIOhbAFmP_mRhCLwbCdEGGCciEx07lEN4b5qR8_OIiEAOQrRfOL23WBD3LUDzdeVyD7TUmenq5LNtcsB3xA">PipingDesign@yahoogroups.com</a>
  Sent: Wednesday, March 31, 2004 9:08 PM
  Subject: Re: [PipingDesign] pipe size calculation [P&IDs]
  

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

• Original Message -----
  From: <Jagarlamudi.Suresh@ril.com>
  To: <PipingDesign@yahoogroups.com>
  Sent: Wednesday, March 31, 2004 11:30 PM
  Subject: Re: [PipingDesign] pipe size calculation
  

> 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