Trans RINA, Vol 156, Part C1, Intl J Marine Design, Jan - Dec 2014
Figure 4.1 Parallel versus linear production methodology
Once the design and sub-assemblies for modularity have been defined these can be made off line from the vessel. This approach can be used for any aspect from interior fit out through to machinery.
4.1(a) Prefabrication reducing cost increasing quality
The most significant of the parallel process flow is the production of subassemblies or pre-fabricated items. This technique is not new and is used widely to speed up build, whether it be houses, airplanes or cruise ships. With the prefabrication technique for small vessels the Author has
experience that an activity that normally takes three hours on a vessel
environment. Not only does the cost reduce but the quality increases. This being the case during initial design the objective should always be to produce as much as possible off the vessel as possible.
Additional benefits of prefabrication and modularity include.
Predictable costs Predictable fitting time and labour cost Addresses skill shortages and labour cost Reduction of procurement overhead Lean and quality control Supply kits line side JIT saving inventory and working capital requirement
Lower fleet operating cost Lower refit costs Lower scrap costs
©2014: The Royal Institution of Naval Architects
determined over the last 30 years of takes 30 minutes in a factory
4.2 MODULARITY AND INFRASTRUCTURE
In order to be able to achieve reduced build times and costs by using modularity it is important to configure the platform to accept the modular system.
For a
number of decades the Mass Transit industry, including trains, coaches and planes have defined infrastructures to improve build and versatility of vehicles.
In addition using standardized infrastructure ensures that any fit out is repeatable, predictable and accessible. In many instances the items such as seat tracks can be tested to a unified standard such as FAA (aviation), ECE 80-annex 10 (Train and HSC), thus improving the safety of the install.
As with trains and planes provision is made within the infrastructure for the running of service and electrical cables. If these service routings are planned and provisioned at the design stage then time and cost can be reduced by the ease of access and fitting. If done correctly the whole vessel should be able to be wired
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