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船舶工程英語（簡體書）
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《全國船舶工業職業教育教學指導委員會推薦教材?示范性高等職業院校船舶專業英語規劃教材:船舶工程英語》可作為船舶工程類專業三年制高職或五年制高職的全日制教材，也可供造船企業、船舶維修及船務公司等相關人員參考使用。
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Common conventional anchor types are: Spek,Hall,Union,Baldt.Spek anchors have the advantage of being fully balanced.Accepted HHP anchors are AC14,Pool and Danforth.CQR and plow-type anchors are only used on small craft.Various copies of accepted types are made all over the world.The conventional type is still used a lot and serves as a standard for newer types of anchor(see table).Conventional anchors are always cast.Newer types can also consist of plates(or other components)that are welded together.If the flukes are hollow,they tend to be more resistant towards bending forces.
Some anchors are fully balanced; this means that the centre of gravity lies so low that the anchor always leaves the water with the flukes vertical.
This has the following advantages:
-an anchor recess that completely envelops the anchor can be used.
-the shell cannot be easily damaged during heaving when the anchor flukes leave the water vertically.
The crown plate ensures that the flukes of the anchor penetrate the sea floor.In certain types of anchor,the flukes prevent the anchor from burying itself too deep in the sea bottom.The navy uses a specially developed HHP-anchor with an open crown plate(bottom,plate).The advantage of this type of anchor is that it digs into the bottom very rapidly.For dredging and offshore jobs there are special anchors which have to be laid down by anchor run boats and are certified as recoverable mooring systems.HHP_anchors are allowed to be 25% lighter in weight because their holding force is twice as strong as that of a conventional anchor.The SHHP-anchors can be 50% lighter in weight,because their holding force in even larger,namely 4 times as large as with a conventional anchor.However,this type of anchor is not accepted by Class for normal ships and can only be used on yachts and special craft.
For Offshore and Dredging special very high holding power anchors are m use,which have to be laid down in position by a tugboat,a so-called"anchor run boat",and also have to be lifted out by the same boat,using a separate wire attached to the crown of the anchor.
