OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

(d) Breast line requirements, using formula (27):

BR x MBL = 7734 + 2272 = 10006 kN

Assuming that the ship has a total of 10 breast lines (BR = 10) symmetrically arranged

(five forward and five aft), the minimum breakiog slrength required for each line will be:

10006

MBL = -- = 1000 kN (= 102 tonnes force)

)0

For a 125,OOOmJ gas carrier (spherical tanks)

(a) Ship particulars:

LDP = 274.0 m

D = 25.0 m

T = 9.0 m (average ballast draft)

AT = 1382 m^2 (al average ballast draft)

A L = 7122 m^2 (al average baUast draft)

(b) Maximum forces on the ship, by use of formulae (19), (20) and (21):

F, max = 825 + 105 = 930 kN

Fy,' max = 2457 + 572 = 3029 kN

F~Amax = 2600 + 612 = 32J2 kN

(c) Spring line requirements, by use of formula (28):

S )( MBL = 3300 + 419 = 3719 kN

Assuming the ship has a total of four spring lines (S = 4); the minimum breaking strength

required for eacb line will be:

3719

MBL = --= 930 kN (= 95 connes force)

4

(d) Breast line requirements, using formula (29):

BR )( MBL = 13518 + 3184 = 16702 kN

Assuming that the ship has a total of 14 breast lines (B = t4) symmetrically arranged

(seven forward and seven aft), the minimum breaking strength required for each wire

wiU be:

MBL =

16702

14

= 1193 kN (= 12210nnes force)