cost breakdown. Generally the engineering component of a large (grassroots
type job) is 4-5%. The tie in component and interfacing with exsting part
can be as high as 6 max 7% of that cost portion. A really ugly retrofit and
plant modification job alone might very rarely go as high as 9-10%. Were
doing one now thats 5%.
Piping cost is typically 40-50% of that cost. the biggest portion. IN the big multidiscipline houses ive worked everybody has access to the main model to interface their part. Each discipline stores its addins in different directories. Electrical dept does the cable trays. they have to work around the others but get to do their rough layout when the steel and major pipiing is roughed in. Small bore is not done till much later by which time the cable trays are laid out.
There is often an interdiscipline war on real estate. one dispute was tos versus top the the rebar that was put on the steel for linear support under the pipes rather than a surface promoting greater friction corrosion. caused a lot of interdiscipline grief.
What amazes me, as PaulH at NG mentioned is that as little as 5yrs, everything had excess material for field cut and fit up.(it still happens) Now the detailing is so accurate the clients are pissed if the modules dont butt perfectly together. 1/8 gskts and spacers now have an impact on the accuracy of fitup. The work is now done to a far higher level in a fraction of the time it used to be , for no more cost that it ever was. ie 5-7%. Why all the bitching about the cost of engineering. What about the other 95%. The only impact the 5% has is if you do it better it can make a significant impact on the other 95% , which really does matter. I hear few discussions about what solutions there are to that.
We've used cadworks to do singly do it all but the size of the job that one or two people can do is still severely limited. The one on coade website was done by one guy about 3months.
I know a plant who got (stupidly) persuaded to use NT for a small water treatment area. It was a joke. Windows foray into Plant control was a huge fiasco that they have dropped. They were pushing this pretty hard in the early 90's. can you imagine the effect of a lockup, which still happens with some graphics we are working on in two Xp machines.
-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com]
Sent: Friday, March 05, 2004 9:51 PM
To: <a href="/group/PipingDesign/post?postID=kb5KykxfB-d09JLYiknzzYv5hcAvcMm-uMPNE3dpuL3xkewkT82Zv6oyL8pjEBpsty6_RYvh05ukOZfiDW2uIyhIhg">PipingDesign@yahoogroups.com</a>
Subject: [PipingDesign] Cost Breakdown for Plant Piping - Questions
Does anyone have a recent cost breakdown for piping vs. other elements of plant construction?
Is it still the biggest single individual cost? Given computerization, I'd think that has also been a big cost factor over the past 20 years or so.
And related, do any of you use variants of MS Windows for plant control systems (snicker)? If so, how do you "three finger salute" (I.E., ctrl-alt-del) a malfunctioning 5000 HP compressor?
I've noticed that many current 3D modeling piping software packages also include the ability to route cable trays, ducts, place steelwork, etc. Who ideally will be doing this, the piping designers or is the idea to task out each discipline?
Theoretically, could one guy do everything? Design-wise, I mean, not engineering.
Paul
Yahoo! Groups Links Received on Sat Mar 06 12:35:00 2004
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:33 EST