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Relation between Detailed eng. and Basic eng.

4 replies [Last post]
Fri, 2006-08-04 08:22
Carmen Arape
User offline. Last seen 7 years 27 weeks ago. Offline
Joined: 26 Jun 2004
Posts: 292
Groups: Petro-Chem / Oil & Gas

Hi Planners,

Is it true that the relation between Detailed eng. and Basic Eng. is 1.5 in terms of duration.?????

For instance, 9 months for Basic Eng., therefore I can assume 14 months for Detailed Eng. based on this factor.

p.s: please think that everything goes well with vendor drawings and the interface with detailed design.

Thanks&Cheers,
carmen
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Replies

Tue, 2006-08-08 22:16
#1
Armando Moriles
User offline. Last seen 17 years 16 weeks ago. Offline
Joined: 9 Dec 2005
Posts: 104
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Ronald,

Thanks for your comments...


Carmen,

Appreciate sharing your actual parameters too. I could use it actually for reference. By the way, does the 3.5 factor includes CADD? Just don’t bother if you find my verification irrelevant...

Regards,
Arman
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Tue, 2006-08-08 20:32
#2
Ronald Winter
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Joined: 4 Jan 2003
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There is never enought time to do it right the first time, but always enought time to do it again correctly. Strange, isn’t it?
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Tue, 2006-08-08 15:45
#3
Carmen Arape
User offline. Last seen 7 years 27 weeks ago. Offline
Joined: 26 Jun 2004
Posts: 292
Groups: Petro-Chem / Oil & Gas
Armando,

Thanks for your response. The relation of 1.5 was a good start if I had only the reference of 9 months of Basic Engineering. I did not have TIME for talking to estimators and doing the exercise trough man-hours.

Well I got a detailed Eng of 12 month and my boss gave the factor of 3.5 for man-hours. I had the total man-hours for Basic Eng.; therefore I had the man-hours for Detailed Eng. (multiplied by 3.5)

Lastly the two estimates of duration and man-hours (both based on factors) gave me a better feeling for checking the IPC schedule (may be +/- 30% accurate, the portion of Engineering).

Building this EPC schedule, the most important for me, was the LLI procurement and Client contracting process. These two phases were based on real durations.

Cheers,
Carmen





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Mon, 2006-08-07 02:09
#4
Armando Moriles
User offline. Last seen 17 years 16 weeks ago. Offline
Joined: 9 Dec 2005
Posts: 104
Groups: None
Carmen,

I tried to check my records, it holds basically applicable to projects like Gold Mining Processing Plant,etc. But, for project like access is a huge factor to conduct the geotechnical investigation which we considered to be part of the basic engineering, the factor is no longer applicable. I think the factor you have is a very good baseline to start with to derive indicative durations.

I would be willing to further establish with you this parameter depending upon the type of project.

Regards,

Arman
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