Container Lashing 234b2q

CONTAINER LASHING SYSTEM CONVENTIONAL SYSTEM: THIS TYPE OF LASHING SYSTEM IS NORMALLY USED ON SHIPS WHICH ARE BASICALLY NOT A CONTAINER SHIP. • THE BASE PLATES ARE WELDED ON STRENGHTENED AREAS OF DECK SO AS TO THE POINT LOADS TRANSMITTED TO THE DECK FROM CONTAINER CORNER FITTINGS. • STACKING CONES ARE FITTED INTO THESE BASE PLATE TO PREVENT CONTAINER FROM SHIFTING • CONTAINERS IN INTERMEDIATE TIERS ARE CONNECTED VERTICALLY AND TRANSVERSELY BY STACKING CONES • THE TOP TIERS CONTAINERS ARE CONNECTED BY BRIDGE FITTINGS • CONTAINERS ARE STOWED ON THE DECK IN FORE AND AFT DIRECTIONS. • THE CONTAINERS ARE THEN LASHED WITH THE WIRES SLINGS TURNBUCKLES DISADVANTAGE OF THE SYSTEM • A LARGE QUANTITY OF LASHING QUANTITY AND A LARGE NUMBER OF LOOSE FITTINGS • HIGH COST OF LASHING EQUIPMENT • REDUCTION IN THE TOTAL CARGO QUANTITY DUE TO LARGE BROKEN STOWAGE • LONG TIME SPENT FOR LASHING • DIFFICULT TO ACCESS THE TOP TIER OF CONTAINER TWIST LOCK SYSTEM • • • • •

IN TWIST LOCK SYSTEM THE BASE PLATES OR FOUNDATION PLATE ARE WELDED TO THE DECK OR THE TANK TOP. THE BASE TWIST LOCKS ARE USED BETWEEN THE CONTAINER AND BASE PLATE. THE LINKAGE PLATE IS USED BETWEEN THE CONTAINERS EXCEPT FOR THE END CONTAINERS THE INTERMEDIATE TWIST LOCKS ARE USED BETWEEN THE CONTAINERS WHILE ANLED TWIST LOCKS ARE USED AT THE END CONTAINERS FINALLY THE BRIDGE FITTINGS ARE FITTED ON THE TOP TIERS OF CONTAINERS

THE TWIST LOCKS NOT ONLY PREVENT THE HORIZONTAL SHIFT BUT ALSO LASH THE CONTAINERS VERTICALLY.

THE TWIST LOCK CONSISTS OF A STEEL BODY THROUGH WHICH A CENTRAL SHAFT ES WHICH HAS CONES AT BOTH THE ENDS.THE SHAFT AND CONES CAN BE ROTATED BY APPROX. 90 DEG BY MEANS OF A LEVER WHICH IS PROTRUDES THROUGH THE HOUSING THE SHAFTS OF TWISTLOCKS ARE FORGED STEEL WITH MBL EXCEEDING 50 T.THE BODY IS GENERALLY MADE OF CAST STEEL.THE LEVER IS SCREW THREADED OR WELDED TO THE SHAFT CENTRE WITH LOCKED AND UNLOCKED POSITION MARKED.THE BODY IS BETWEEN 20-25 MM IN HEIGHT TO PROVIDE SUFFICIENT STRENGHT AND SPACE FOR LEVER OPERATION.THE TWISTLOCKS PROVIDEE THE VERTICAL CONNECTION .THE TRANSVERSE CONNECTION CAN BE ACHIEVED USING THE LINKAGE PLATE. THE TWISTLOCK SYSTEM REDUCES THE LASHING EQUIPMENTS .THIS MAKES THE LASHING OF CONTAINERS EASIERS AND QUICKERS TRANSVERSE LASHING SYSTEM: THIS SYSTEM MAINLY USED TO NEGATE THE EFFECT OF HOZONTAL FORCE ARISING DUE TO ROLLING OF THE SHIP IN ATHWARTSHIP DIRECTION.THIS SYSTEM IS TRANSMIITING ALL HORIZONTAL FORCES TO REINFORCED PART OF THE SHIP STRUCTURE. • THE CONTAINERS ARE CONNECTED TRANSVERSELY BY DOUBLE INTERMEDIATE STACKING CONES OR TWISTLOCKS WITH LINKING PLATES FORMING A SOLID BLOCK. • A TRANSVERSE LASHING EQUIPMENT IS THEN WEDGED BETWEEN THE CONTAINER BLOCK AND THE SHIP’S STRUCTURE AT THE LEVEL OF CORNER FITTINGS OF THE UPPER TIERS ON BOTH SIDES. • THE TRANSVERSE ELEMENTS CAN BE PRESSURE OR PRESSURETENSION TYPE.IF TENSION AND PRESSURE TYPE USED ON EACH SIDE,THE HORIZONTAL FORCE SPLIT INTO TWO AND EACH ELEMENTS BEARS THE HALF OF FORCE. ADVANTAGE: • A REDUCTION IN THE QUANTITY OF FIXED AND PORTABLE LASHING EQUIPMENT INCLUDING THE ELIMINATION OF ALL DIAGONAL LASHINGS • AT LEAST 50% SAVING IN COST AS COMPARAED TO CONVENTIONAL SYSTEM • IT PERMITS GREATER STACK WEIGHTS • EASY TO FIT AND ELIMINATION OF THE PROBLEM OF POSITIONING OF LASHING FOR UPPER TIERS THUS REDUCING THE LASHING TIME.

CELLULAR SYSTEM •

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IN CELLULAR SYSTEM THE FORCES ACTING ON THE CONTAINERS ARE TRANSMITTED TO HULL BY MEANS OF STEEL STRUCTURE CONSISTING OF VERTICAL STEEL ANGLES PLACED AT THE FOUR CORNERS OF THE CONTAINER WHICH KEEP IT IN POSITION. VERTICAL STEEL ANGLES ARE SLIGHTLY FLARED AT THE TOP TO FACILITATE THE ENTRY OF THE CONTAINERS. THE VERTICAL ANGLES ARAE WELDED OR BOLTED TO TANKTOP . THE CLEARANCE BETWEEN THE CONTAINERS AND CELL GUIDES ARE KEPT MINIMUM IN ORDER TO PREVENT THE MOVEMENT OF CONTAINERS. THE VERTICAL CELL GUIDES ARE CONNECTED BY HORIZONTAL BEAMS IN BOTH TRANSVERSE AND FORE AND AFT DIRECTIONS AT CORNER FITTING LEVELS. THE CELL GUIDES ARE FIXED AT 40’ LENGTHS AND REMOVABLE AT 20’ LENGTHS.

THE CELL GUIDE SYSTEM IS THE QUICKEST AND MOST PRACTICAL WAY OF SECURING CONTAINERS.IT COMPLETELY ELIMINATES THE USE OF PORTABLE LASHING EQUIPMENTS.