OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

Where doublers (or pads) are used, the width should be small to prevent bending under tension
loads. Following are typical pad widths and thicknesses which may be used as a guide:

Leg thickness of Pad width (mm) Pad thickness (mm)

fittings (mm) (max)

Less than 12 50 14

12-13 50 16

14-16 60 19

17-19 70 22

20 and above 75 25

Note. (a) Pad corners should be provided with a minlP':Jm of 20 mm radius. The shape 01 pads should be d~igned 10 suil

!hal of legs of fittings.

(b) A greater pad widlh causes failures (separation of the pad from the deck plate) at lower loads.

5.7.3 High Strength Steel Fillings

Some mooring fittings may be built of higb tensile steel (HTS) to reduce weight or to improve

slrengrh. Connections of such filtings, especially when the deck structure is of a lesser strength steel,

should be carefully calculat.ed. Where tbe maximum stress occurs at the base of tbe fitting (such as the

frame of a universal cbock) and fhe deck is not of HTS or of a sufficient t.hickness, a deck inse.rt

plate of HTS may be required along with HTS strengthening members below the deck. Likewise.

ex.isting structures such as deck beams directly in line wit h HTS members above Ihe deck may have

to be locally replaced with HTS members. If the deck connection and reinforcing method is carefully

thought out before designing or selecting fittings for a ship, installation will be simplified and overall

costs reduced.