Study On The Hatch Cover Scheme Optimization Design And Manufacturing Technic Of Bulk Carrier

Hatch cover is one of the key equipments of bulk carrier,which is the closing device on cargo area deck opening.It is belonging to the vertical handling access equipment.The applicability and functionality is an index to assess ship quality,so the design and fabrication is very important.At present,almost all the hatch cover design applied to medium & large bulk carrier built in domestic ship yard are from two companies of Mac GREGOR and TTS.These two companies of strict technology confidentiality and high design & patent cost have been mainly monopolized the market of hatch cover,and restrict the saving cost and improving benefit for shipyard.With rapid development of shipbuilding,varieties of ship types appeared in market,several among of them are leading the market such as bulk carrier,ore carrier and container vessel.Especially,the market shares for bulk carrier occupied about 40%~50%.At present,almost all the hatch covers design of medium & large bulk carrier are monopolized by foreign companies and Sino-foreign joint venture companies.Thus the shipbuilder and design department had been making efforts all the time trying to create an independent brand and competitive brand,and this will directly help to save shipbuilding costs and promote shipyard competitive.The thesis outline the analysis for the bulk carrier hatch cover design technological process,and describe the design solution,type-selecting principle for hatch cover.what is more,it deeply research and summarize for hatch cover structure design standard、structure type、sealing device、 compression device、supporting device、limit device、roller device、power system etc.based on design element.Design optimization is the essential of the thesis,in which the hatch cover of 51000 DWT was researched as example to reduce the weight of cover.The research show that about20% ~ 30% cost was saving based on to the satisfaction of building specification signed between owner and shipyard.The thesis elaborate the fabrication workmanship for folding and sliding hatch cover,and detailed engineering breakdown and working guidance for steel laying-off 、 plate joint 、welding、 parts fabrication、deformation correcting、blasting and rust-removing、assembling、painting、storage and transportation、installation and commissioning on board etc.It shall provide instructive guidance for professional hatch cover manufacture and advance the shipbuilding industry promotion and competitiveness.