PHOTOGRAMMETRY IN SHIPBUILDING: MEASURING A COMPLEX CASTING
Within the last three years photogrammetry has been employed in real production situations by six shipbuilders in the United States. Five of them have applied the process repeatedly for: surveys to predict the fit of 126,000DWT tankships built in halves, measuring city-block size subassemblies for the world's largest offshore platform, determining the circularity of Trident class submarine hulls, verifying that Conch type and spherical LNG tanks are within dimensional tolerances and producing LNG tank sounding tables of unprecedented accuracy. Some ship and airplane builders in the United States are already considering in-house capabilities. They appreciate photogrammetric measurement because it imposes the least interference with ongoing production and the photographs used are irrefutable permanent records. This report describes a procedure for obtaining accurate dimensions of a complex casting. It should be of particular interest to quality assurance people and those responsible for fitting a casting to adjoining structure. The last two pages provide a time and cost analysis and are especially noteworthy because it describes potential productivity gains in the entire process associated with complex castings including design, inspection and installation. It also identifies benefits that could be obtained, without the application of photogrammetry, if shipbuilders impose certain nominal dimensioning requirements on designers and if certain marking instructions are included in purchase specifications for castings.
Todd Pacific Shipyards Corporation1801 16th Avenue, SW
Seattle, WA USA 98124
Washington, DC USA 20590
- Publication Date: 1979-2
- Pagination: 11 p.
- TRT Terms: Analysis; Casting; Costs; Data processing; Hulls; Photogrammetry; Productivity; Quality control; Shipbuilding; Shipyards; Struts
- Uncontrolled Terms: Cost analysis
- Old TRIS Terms: Casting methods; Hull fit up
- Subject Areas: Finance; Marine Transportation;
- Accession Number: 00189269
- Record Type: Publication
- Source Agency: Maritime Administration
- Files: TRIS, USDOT
- Created Date: Mar 28 1979 12:00AM