This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Ship Production
Lecture 10 – Shipyard Processes
Shipyard Processes:
• Ship Drawing offices & Loftwork
• Plate & section preparation & machining
• Welding & cutting
• Subassembly
• Prefabrication
• Launching
• Outfit
• Corrosion control & paint systems
2
Plate & Section Preparation :
Steel plates & sections shot-blasted to remove rust & millscale, primed with temporary protective paint.
Plate & Section Preparation – Shot Blasting :
3
Plate Section Preparation :
Steel plates straightened using roll machines (mangles).
Plate & Section Preparation :
Plate handling may be performed by:
• Overhead electric cranes
• Electric powered trolleys – collacator unit running on rails
• Transporter lowloader
• Conveyor systems and integrated units
4
Plate & Section Preparation - Handling:
Plate & Section Preparation - Handling:
5
Plate & Section Machining:
Number of methods for forming plates into required shapes.
Information derived from CAD/CAM systems
• Profile cutting machine
• Planing machines
• Drilling machines
• Guillotines
• Presses
• Plate rolls
• Heat line bending
Plate & Section Machining - Profilers:
Employed when plate is required to be cut into two or more plates or complicated shapes. Usually flame or plasma-arc.
6
Plate & Section Machining - Profilers:
Plate & Section Machining - Profilers:
7
Plate & Section Machining - Planing:
Some plates only require trimming and edge preparation – carried out using planing machine.
• Flame or plasma-arc
• Mechanical
Plate & Section Machining - Planing:
8
Plate & Section Machining - Planing:
Plate & Section Machining - Presses:
Hydraulically powered press to cold work steel press.
• Sacrificial anode – metals attached to hull which are more anodic (less noble) than steel when immersed in salt water, e.g. zinc plates.
• Impressed current systems – voltage difference maintained between hull and fitted anodes. May use noble metals as anodes to reduce deterioration.
27
Paints:
• Anti-foul paints – self polishing anti-foul paints can last up to 5 years. Now Tributylen Compound (TBT) free due to International Maritime Organisation (IMO) requirements.
• Paint coating to prevent corrosion.
What differences would be visible when constructing a composite vessel?
28
Composite Vessel:
• Mould construction
• Materials storage & resin shelf life
• Safety & quality considerations
• Laminating sequences
• Curing times
• Crane requirements
Composite Vessel:
29
Composite Vessel:
Composite Vessel:
30
Composite Vessel:
Composite Vessel:
31
Composite Vessel:
Composite Vessel:
32
Aluminium Vessel:
• Welding/cutting techniques
• Labour intensive
• Painting requirements
• Crane requirements
Aluminium Vessel:
33
Further reading:
Eyres, D., Ship Construction, 5th Edition, Butterworth-Heinmann, Oxford, UK, 2001.
Taylor, D., Merchant Ship Construction, 4th Edition, Institute of Marine Engineers, London, UK, 1998.
Taggart, R., Ship Design and Construction, SNAME, New Jersey, USA, 1980.
Storch, R., Hammon, C., Bunch H., and Moore R., Ship Production, 2nd Edition, SNAME New Jersey, USA, 1995.
Lamb, T., Ship Design and Construction I & II, SNAME, New Jersey, USA, 2003.
Lewis, E., Ed. Principles of Naval Architecture: Volume I - Stability and Strength, SNAME, New Jersey, USA, 1988.
Shenoi, R. & Wellicome, J. (Ed.) Composite Materials in Marine Structures. Volume 1 Fundamental Aspects. Volume 2 Practical Considerations, Cambridge University Press, Cambridge, UK, 1993.