Re: Urgent Vent and Drain Issue!

On the P&ID all that is needed is a note; "designer shall ensure that vents and drains are properly specified".

That "P&ID is God" statement I agree with, but I think you've left out some other religious denominations.

Paul "the Devil is in the details" Bowers

• Original Message ----- From: "Steve McKenzie"

> Yeah
> I have two.
>
> 1) I agree it shouldnt be on the PFDs, but it should be on the P&IDs. What
> is the supervisor meant to do when he starts finding branches on the
> pipework that arent on the P&ID? Does not comply. I always tell my guys
the
> P&ID is god.
> Not convinced the branches are hydro test connections as these often go in
> the test flanges. Have sometimes used branches for installed hydro tests
on
> multiple lines, however.
>
> 2) Old guys dont whine about the good old days any more because nostalgia
> aint what it used to be.
>
> Cheers
>
> Steve McKenzie
>
> -----Original Message-----
> From: Paul Bowers [mailto:pbowers@pipingdesign.com]
> Sent: Wednesday, July 03, 2002 7:53 PM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] Urgent Vent and Drain Issue!
>
>
> Someone already mentioned that connections may be required for shop hydro
or
> pneumatic testing (not for draining or venting).
>
> Unless the designer is actually specifying spool lengths and knows exactly
> how the parts of the puzzle will be assembled prior to erection - heh-heh,
> he said "erection" - in the field, usually the fabricator dictates any
> supplementally needed connections. The cost of this is covered in the
> contract.
>
> PFDs should only show connections which are process-related or
> specially-required connections due to unusual fluids or processes. Adding
> this information at an early stage only confuses everything. P&IDs are
> similar; it is not required to show *every piping detail* on it. It's
always
> fun to see the newbies argue about what should and should not be on the
> P&ID.
>
> Then again, I'm assuming that even junior CAD guys are given
> project/process/piping specs the day they start and that they actually
read
> and absorb them. Maybe I'm wrong and juniors are too busy these days/are
not
> considered important enough to be given the documents.
>
> Or maybe the older guys that know all this stuff can't figure out how to
> access the project specs on the intranet, so they sit around all day
whining
> about the old days.
>
> Comments?
>
> Paul
>
> > If at all, It will be as per the process requirement only. Are you sure
> > it's not there in the P&ID?
>
>
> > > Recently one of our Piping subcontractor has asked for extra drain
> points
> > > in the GRP pipe lines.These would be in additional to the normal high
> > > point vents or low point drains. Is there any technical reason for the
> > > same? Should the same be provided?
Received on Wed Jul 03 04:49:00 2002