Relation between Detailed eng. and Basic eng.

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factor to conduct the geotechnical investigation which we considered to be part of the basic engineering, the factor is no longer applicable.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

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

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?

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