Page 81: of Maritime Reporter Magazine (January 1998)

SHIP & BOATBUILDING TECHNOLOGY • Producibility: will the design reduce the cost or schedule to build? • Affordability: a cost comparison between Slow Speed and Medium

Speed Diesel engine rooms.

The Producibility metric rated each ship system based on infor- mation from the cognizant system engineers. The rating values were derived from QFD analysis and cost estimate rationale. The results constituted an in-process method that could be easily evalu- ated during the design evolution.

The costs for the Affordability metric were derived from vendor quotes and costs from active ships.

Labor hours were from the Odense shipyard. The results were used as in-process cost monitoring.

The product and process spider charts developed during the

SSD#1 design were also main- tained. Agreement was reached during this phase, that these spi- der charts would reflect the cumu- lative measurements for each pro- ject.

The team dynamics measure- ment tool developed during the

SSD#1 design was refined, and toward the middle of the MSD design the tool was used biweekly.

The team analyzed the informa- tion, collected from the previous two weeks, with decent results. At this time, prior data was not used in the analysis.

Product Lessons Learned

The 3-D-product model continued to gain importance to the project as more and more of the team members became acclimated to the information (both graphical and technical) that could be extracted from it.

The Level 3 Unit simplified the integration of the equipment arrangement and piping with the support structure. In addition, the ability to complete assembly and a significant portion of the testing of the Level 3 unit in the shop prior to erection was projected as having a significant impact on the erec- tion schedule and the completion of the engine room at launch. The elimination of the space required for the upper portion of the slow speed diesel engine and its service area on the 12 m deck resulted in an increase of cargo space of 1,100 cu. m. The side stack potentially increased the container capacity by 40 TEUs. The potential annu-

January, 1998 al revenue increase was $7.5 mil- lion at 75 percent utilization, which was offset by an estimated annual increase of fuel consump- tion costs of $50,000 over the base- line SSD#1 design. Consensus on the maintenance cost impact of the slow speed design with a total of 31 cylinders versus the medium speed diesel design with a total of 30 cylinders was not achieved and remained as a point of contention within the team and the Steering

Committee.

Although the material cost of the three 50 percent seawater cooling pumps was equal to that of two 100 percent pumps — and the installation cost was increased — there would be an estimated $36,000 annual decrease in fuel cost by coupling the three pumps to the Alfa-Laval ENGARD sys- tem. In addition the design pro- vided an increase in reliability, availability and maintainability due to the flexibility of three

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