OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

WIND CURRENT

FORCE / CONDITION COEFF. DIRECT. SPEED COEFF. DIRECT. SPEED APPLICABLE

WATER DEPTH

-^0 KNOTS -^0 KNOTS TO DRAFT RATIO
WD
F. i FULL LOAD - .95 180 60 - .035^180 3.00 --= 1.10
T

WD

F yF! FULL LOAD +.26 100 60 + .43 170 2.00 --= 1.10

T

WO

FYA I FULL LOAD +.^49 65 60 + .46^10 2.00 --= 1.10

T

WD

F.! BALLAST -.86^180 60 - .038^180 3.00 -< 4.4

T

WD

F yF J BALLAST + .49^115 60 + .342"^110 0.75 --= 3.0

T

WD

F yA I BALLAST + .55^70 60 +.345·^75 0.75 --= 3.0

T

• The tranS\le'rSEI current coefficients in the ballast condition are estimaled values sine.e no lest data Is available for the
  standard watel' depth to draft ralio of 3.0:'1. The accuracy 01 'these coeHicients ganerally does not affect the breast line
  requirements since these are governed by the lull load condition In most cases.

AI.1 formulae ma y be used for bmh "conventional" and "cylindrical" bow shapes as described in
Scct.ion 2.3. Under the standard wind and current criteria the how shape aHect~ only the transverse
current forces. A "conventional" bow shape was assumed. Forces wit.h "cylindrical" bows ma y be
lower, but the overall effect on the ma)timum transverse force is not signi ficant.

2.4.2 Maximum Longitudinal and Trans verse Forces on 75,()()O m-' Gas Carrier with Membrane or
Prismalic Tanks

For a 75,000 m) gas carrier (membrane tanks or prismatic tank, where the cargo tanks do not
protrude above the upper deck) the maximum combined forces are:

F, max = 0.557 AT + 0.0425 TLRP {kN)

F~F max = 0.331 Al + 0.2320 TLIlP fkNI

FYA max = 0.387 Al + 0.2482 TLap [kNI

(16)

( 17)

(18)

2.4.3 Maximum Longitudinal alld Transverse Forces on 125,O()() m'> Gas Carrier w;Ih Spherical Tanks

For a 125,000 m) gas carrier (spherical tanks) the forces are:

F, max = 0.597 AT + 0.0425 TLIlP [kNJ

F~I' max = 0.345 Al + 0.2320 TLop [kN)

F~A max = 0.365 AL + 0.2482 TLBP [kN)

( 19)

(20)

(21 )

Symbols and units are the same as used in Section 2 .3. Since a gas c,arrier's draft changt;s little
during normal cargo lransfcr operations. 1 he coefficients for a waler depth to draft ratio of 1.1: I
have been used throughout. The above formulae for gas carriers sho uld only be u sed for gas ships
that are geomc.rica[)y similar to tbase listed in Reference 5.