tailieunhanh - Guide to Ship Repair Estimates Episode 6

Tham khảo tài liệu 'guide to ship repair estimates episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5 Mechanical works In the following mechanical works it is assumed that all are in situ overhauls and that the items considered are all accessible for the work to be performed. If any item is to be removed ashore to the workshops then an assessment of the work involved must be made and the rates given amended accordingly. This is considering removals to permit transportation of the item from the ship and their later refitment on completion of the reinstallation. Mechanical works 41 Overhauling diesel engines single-acting slow-running two-stroke cross-head In the overhauling of large main propulsion engines it is assumed that the ship will provide all the specialized equipment necessary. This refers to heavy-duty equipment which is normally supplied by the engine manufacturer and also any special hydraulic tensioning equipment for fastenings. In main engines it is assumed that there are lifting devices such as overhead beams runner blocks and or overhead cranes. Figure 8 A main propulsion diesel engine 42 Guide to Ship Repair Estimates in Man-hours Table Top overhaul Disconnect and remove cylinder head withdraw piston remove piston rings clean calibrate and reassemble as before using all owner s supplied spares. Cylinder bore mm Man-hours per cylinder 500 67 550 70 600 75 650 80 700 87 750 95 800 105 850 115 900 125 950 137 1000 150 Cylinder cover Disconnect and remove cylinder head clean all exposed parts including piston crown and reassemble as before using all owner s supplied spares. Assume as 60 the rate of top overhaul rate. Mechanical works .

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