Tham khảo tài liệu 'guide to ship repair estimates episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table Crankshaft deflections - 2 a Opening up crankcase door for access works and refitting on completion. b Setting up deflection indicator gauge turning engine using ship s powered turning gear and recording observed readings. Removing equipment and closing up crankcase door on completion. Cylinder bore a Crankcase doors b deflections mm Man-hours per door Man-hours per unit 100 4 4 100-200 4 6 200-300 4 8 300-400 6 12 400-500 8 16 500-600 8 20 Mechanical works 51 Valves Table Overhauling valves Opening up hand-operated globe and gate valve for in situ overhaul by disconnecting and removing cover spindle and gland cleaning all exposed parts hand grinding of globe valve light hand scraping of gate valve testing bedding painting internal exposed areas and reassembling with new cover joint and repacking gland with conventional soft packing. For low-pressure valves below 10 kg cm2 the tariff is the same as for sea valves. This also applies to the increases for location. The following increases can be applied according to the pressure Pressure kg cm2 Increase over sea valve tariff 10 100 16 120 20 140 40 160 60 180 80 200 Notes Insulation renewal excluded. Pressure testing in situ using ship s pump additional 5 hours per valve. Pressure testing in situ using contractor s pump additional 7 hours per valve. Removal and overhaul ashore in workshop double the in situ rate. Metallic or special packings owner s supply additional 2 hours per valve. Rates apply to hand-operated valves only. 52 Guide to Ship Repair Estimates in Man-hours Figure 10 A ballast system valve chest Mechanical works .
