PetroBob
Chemical
- Dec 23, 2005
- 60
What are typical rule of thumb ratios that experienced engineers use when calculating number of deliverables for a process design? For example, if you know the approximate number of PFDs in a typical plant, how do you ratio to estimate of number of P&IDs, lines, major equipment, instruments etc? Recognizing that of course this will vary for each type of process. I'm looking for a starting point, say for a reasonably industrial process such as refinery, SAGD, LNG plant, Water Treatment, etc.
For example, how does the following look:
No of P&IDs = 6 x no of PFDs
No of LDT lines = 9 x no of P&IDs
No of plot plans = 0.5 x no of PFDs
No of major equipment items = 4 x no of PFDs
No of instruments = 7 x no of P&IDs
For example, how does the following look:
No of P&IDs = 6 x no of PFDs
No of LDT lines = 9 x no of P&IDs
No of plot plans = 0.5 x no of PFDs
No of major equipment items = 4 x no of PFDs
No of instruments = 7 x no of P&IDs