Hitung drink water & Final draft

 Sebuah kpl = 150 m, tiba dimuara sungai dgn sarat depan = 5.5 m & sarat belakang 6.3. MTC = 200 ton/m TPC=15, COF berada 1,5m dibelakang center line. Kpl baru boleh masuk sungai jika Draft belakang=6.2 m shg perlu mengisi Ballast pd Fore peak Tank (FPT)

Hitunglah : drink water yg hrs diisi & Final draft

Draft Lama  = 6.3 m

Draft yg diinginkan         = 6.2 m

Penguranan Draft           = 0.1 m

Boclily Sinkage                 = w/TPC= W/15

COD yg diinginkan            = 10 + W/15

COD Aft     = l/L x COT

                  = 73.5 x w x 61.5

                             150        200

                  = 0.49 x 0.3075 w

                  = 0.1507 w

Draft belakang yg diinginkan = 10 + w/15

0.1507 w     = 10 + w/15

2.2605 w     = 150 + w

1.2605 w     = 150

w                = 119.0 Ton

Bodily Sinkage = W/TPC = 119/15 = 7.93 cm

COT   = Wx d = 119 x 61,5 = 36.59 cm

              MCTC       200

COD Aft  = l/L x COT = 73.5 /150 x 36,59 cm

= 17.93 cm

COD fwd = COT – COD

Aft = 36.59 – 17.93 = 18.66 cm

 Fwt            Aft

Initial Draft          =  5.5000 m     6.3000 m

Bodily Sinkage    =  0.0793 m +  0.0793 m +

Present Draft      =  5.5793 m     6.3793 m

COD      =  0.1866 m +   0.1793 m -

Final Draft   =  5.7659 m    6.2000 m

Draft akhir poros air dalam dock

Sebuah kapal L = 132 m dg draft F= 6,3 m, A= 7,5 m, sebelum memasuki dock diket stern post clearance = 0,3 m dari dock keel.

Ditanyakan :

Draft akhir jika poros air dalam dock turun = 0,9 m

HDC terlampir

Jawab :

P air trn dlm dock         = 0,9  m

Stern post clearance     = 0,3  m

Air trn hg lunas menyentuh

keel block               = 0,6  m

M.Draft = 6,9 

MCTC   = 130,8 ton

 TPC       = 19,6 ton

 Mid F    =  1,1 m forward

L1 = ½ 132 + 1,1 = 67,1  m

P  = (trim x MCTC)/d = (60 x 130,8)/67,1 

    = 116,96

COD = (67,1 / 132) x COT

(67,1/132) x COT = 60 – (116,96/130,8)

COT = 115,9  cm

COD Aft    = (67,1/132) x 115,9 = 58,92  cm

COD Fwd = 115,9 – 58,92        = 56,98  cm

Rise          = 116,96/19,6           = 5,97   cm

Initial Draft  ( F )   6,300   ( A )    7,500

Rise                -       0,060     -        0,060

COD              +       0,569     -        0,589

Final Draft    ( F )   6,809   ( A )    6,851