Tham khảo tài liệu 'guide to ship repair estimates episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure 6 Repair of damage to shell plating Steel angle For flat steel angles measure the length in metres the widths of each leg in metres and the common thickness in millimetres. Take the specific gravity of the material. For steel the SG is but it is common practice for estimators to use 8. To calculate the weight of the steel angle in kg Multiply L X W1 W2 X Th X SG For example Angle no. L m W1 m W2 m Th mm SG Wt kg 1111 1 10 8 26 For other steel sections break each down into separate flat sections calculate individually and finally add together to obtain the total weight of the section. Steel works 31 Table Steel works renewals Plate thickness mm Man-hours per tonne Up to 6 8 10 16 18 20 250 245 240 230 220 210 200 Correction for curvature Factor increase Single Double Correction for location - external Factor increase Flat vertical side above 2 metres in height and requiring staging for access Bottom shell accessible areas . no removals of keel blocks Keel plate Garboard plate Bilge strake Deck plating Correction for location - internal Factor increase Bulkhead Longitudinal transverse above DB areas Longitudinal transverse below DB areas 32 Guide to Ship Repair Estimates in Man-hours Other adjustment factors Man-hour adjustment For fairing works Remove fair and refit Fair in place if practicable 80 of renewal price 50 of renewal price Note For high-tensile grade AH shipbuilding steels increase rates by 10 . Notes for steel works renewals The steel weight is calculated from the maximum dimensions of each single plate and applying a specific gravity of 8. Staging for access and cranage is normally included within the price differences for repair locations. This should be checked with the contractor. A minimum quantity of steel renewals per area is usually stated in a ship repairer s tariff or conditions and is dependent upon the size of the shipyard and of the vessel. Below this .
