By David MacGregor
Amazing, specified examine the similarities and ameliorations among American and British Clipper Ships that have been in carrier within the 1850s; profusely illustrated with the authors personal, hugely special plans and line drawings plus extra b w illustrations.
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Extra info for British American Clippers: A Comparison of Their Design, Construction and Performance in the 1850s
Removing internal floor plates, or grating, cleaning, painting, and refitting. Small vessels Cable dia. (mm) Man-hours (per side) <25 25–50 75 90 Large cargo vessels and oil tankers DWT Man-hours (per side) <20,000 20,000–50,000 50,000–100,000 100,000–200,000 200,000–300,000 Over 300,000 100 130 140 200 250 270 Note: Removal of sludge will be charged extra per m3. 36 Guide to Ship Repair Estimates Staging This item is usually charged within a particular job. When included within the charge of a job, that job price is increased accordingly.
5 17 18 19 20 22 24 25 27 30 Notes: Valves in pump rooms, additional 15%. Valve in cofferdams and inside tanks, additional 20%. Removals for access not included. Staging for access not included. Removing valve ashore to workshop for above type of overhaul requires special consideration, dependent upon size. Valves below 20 kg in weight can be assessed as double the in-situ rate. Above this requires rigging and cranage input, which should be assessed separately. 13 Ship side storm valves Opening up ship side storm valve for in-situ overhaul, by disconnecting and removing cover, spindle and gland, cleaning all exposed parts, testing bedding, painting internal exposed areas and reassembling with new cover joint and repacking external gland with conventional soft packing.
From the above tables and results, it will be seen that approximately three to four times the weight of zinc anodes are required, to that of aluminum, for the same protection. It is for this reason that, in larger vessels, aluminum is used in preference to zinc. Of course, aluminum is much more expensive than zinc. 11 Sea chests and strainers Opening up of sea chests by removing ship side strainers, cleaning, and painting with owner’s paints, as per hull treatment specification. Assuming single grid per chest.