as the progress of the project. Thus, the widest accuracy range is for a capacity
factored estimate at the beginning of a project. The narrowest range therefore is at a
definitive estimate stage around 30–40 % of project completion. The second set of
curves gives a range of contingencies to be applied to the various estimate types.
This is a plot of percent of total field and office costs against the estimate type used
for the accuracy curves.
Table 17 The definitive cost estimate summary
Plant
Description
Date
A/C
Estimated cost, MM $
No
Item
M/h
Labor
Subcont
Material
Total
Excavation
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Concrete
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Structural steel
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Buildings
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Machinery/equip
Xxxxxxxx
Xxxxxxx
17.876
Xxxxxxx
Piping
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Electrical
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Instruments
Xxxxxxxx
Xxxxxxx
Xxxxxxxxx
Xxxxxxx
Painting/scaffold
Factored
Insulation
Factored
Direct field cost
Xxxxxx
Xxxxxxxx
Xxxxxxxx
Xxxxxxxxx
Xxxxxxxx
Temp const facil
Xxxxxxxx
Xxxxxxxx
Xxxxxxxx
Constr expense
Xxxxxxx
Craft benefits and
burdens
Xxxxxxx
Equip rental
Xxxxxxxx
Xxxxxxx
Small tools
Xxxxxxxx
Xxxxxxx
Field O/heads
Xxxxxxx
Indirect field costs
Xxxxxxxx
Xxxxxxxx
Xxxxxxx
Total field costs
Xxxxxxx
Engineering
salaries
Xxxxxxx
Xxxxxxx
Purchasing sal
Xxxxxxx
Xxxxxxx
Gen office sal
Xxxxxxx
Xxxxxxx
Office expense
Xxxxxxxx
Payroll burdens
Xxxxxxxx
Overhead costs
Xxxxxxxx
Total office costs
Xxxxxxxx
Xxxxxxxxx
Xxxxxxxx
Xxxxxxxx
Total field and
office costs
Xxxxxxxx
Fee (contractor)
Xxxxxxxx
Escal/contingency
Xxxxxxxx
Total costs
Xxxxxxxx
Petroleum Refinery Planning and Economics
727