Estimation of Man-Hours for Fabrication of Ships and Offshore Platforms

Abstract

This paper presents a procedure for estimating the man-hours (MH) required for building ships and offshore platforms. Information gained from building completely different types of products may be used. The procedure is suitable for the bidding phase. The procedure makes it possible to investigate changes in estimated MH caused by changes in the fabrication process or design or effectiveness in the workshop. Sensitivity analysis of estimated MH may be used for evaluation of investments or as a basis for reduction of MH in bidding. Part I of the paper is the theoretical basis of the procedure. Part II is an implementation in building of a hull. This method for estimation of MH is implemented for building of load-bearing structures. Estimation can take place quickly, and sensitivity to changes in fabrication methods, design, and effectiveness in the workshop is visible. Examples of graphical representation of fabrication data for five disciplines are presented.