It is much you want from one source,
I think you need different sources,
What prices do you want,
Engineering, equipm., piping, instr., struct. electr.?
What plant? Ethylene, food, crackers?
Maybe there are sources for complete plants,
but presumable you won´t find it on the internet.
Manufacturers often put their prices not on the internet,
they make you an offer.

succes

Are you looking for Lang factors (i.e. process plant component costs as factor of priced equipment) or capital cost indices (CE Plant Cost Index, Nelson Farrar Refinery Inflation Index, etc.)?

I don’t know of any sources that give unit capital costs, say in terms of bbl/day capacity.  You may need to try to find capital cost figures for recent, similar plants in the public domain and factor them to suit your capacity and location.

In my country there is also an association of cost engineers where you can order a book with all costst of construction and engineering works.

To europipe,

Thanks for your replay. Could you provide me the address of association you are talking about?

http://www.dace.nl/

Also:
- The Association for the Advancement of Cost Engineering (USA), http://www.aacei.org/
- The Association of Cost Engineers (UK), http://www.acoste.org.uk/

We have a system for estimating new plant construction based upon John Page's database/estimating system:

http://www.interplansystems.com/html-docs/conceptual-cost-estimator.html

Bernard Ertl
InterPlan Systems
 - eTaskMaker Project Planning Software
 - ATC Professional Turnaround Management Software