OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

2.4 MAXIMUM LONGITUDINAL AND

TRANSVERSE FORCES UNDER THE STANDARD

ENVIRONMENTAL CRITERIA

The foUowing formuJae are based on force and moment coefficients provided io rbe 1994 edition of
Refere nce 3 and the 1985 edit ion of Reference 5 and are valid for the standard wind and current
criteria outlined in Section 2.2 above.

For oil tankers subject to the standard wind and current environmental conditions. formulae are
Jjsteci for borh the full and loaded baUast condi tions. The condition showing the highest total force
will govern. For gas ~'arriers. only one condirion is listed since the draft changes lillle during nonnal
cargo transfer operations.

2.4.1 Maximum Longiludinal and Transverse Forces on Oil Tankers

For oil tankers over 16.000 tonnes deadweighr the maximum forces are as follows:

Full Load Condition:

F y max = 0. 550 ATI' + 0.0425 d Lop [kN]

F), mal( = O.1506AI.F + 0.2320 d LRf [kNJ

F yA m.ax = 0.2839 A Lf + 0.2482 d L11P [kN-1

Ballast Condition (mean draft = do)

F. max = 0 .49 (^8) An + 0 .04613 da Lap [kNJ
F yJ' max = 0. (^284) AWl + 0 .02595 da LAP [kN)

F),ft max = 0.3 19 ' AlO + 0.02617 de La,' [kN]

Ballast Condition (mean draft = 0 .02 LBP + 2 metres)

Where:

F, max '" 0.498 ATB + 0.0923 (0.01 L~p + L 8 .. ) (kNJ

F\F max = 0.284 ALII + 0 .0520 (0.01 L~ .. + L8P) [kNJ

F y A rnax = 0.319 A l~ + 0 .0524 (0. 01 L~p + Lnp) (kNJ

cl = full load (summcr) draft in mClres

(7)

(8)

(9)

{ 10}

( 11)

(12)

(13 )

( 14)

(IS)

ATF = Iransverse above water area in the full load condition, in square melres

An = transverse above water area in (be ballast condition. in square melres

AlF = longitudinal above water arca i.n (he fuU load condition, in square metres

ALB = longirudinal above water area in rhe ballast condition, iD square metres

The maximum forces arc based on the following wi.nd and current coefficients.