4.1.1 Where
specified in the Rules the fatigue performance of the hull structure
is to be assessed in accordance with the applicable ShipRight FDA
procedures. Where an appraisal has been made whether on a voluntary
or mandatory basis of the fatigue performance of the hull structure
in accordance with the relevant procedures and found to comply with
the requirement of 20 years fatigue life based on the 100A1 Fatigue
Wave Environment (World-wide) trading pattern the ShipRight notation FDA will be assigned, see also
Pt 1, Ch 2, 2.3 Class notations (hull) 2.3.17. In general the
ShipRight FDA procedure is mandatory for all bulk carriers and oil
tankers without a CSR notation and of length greater
than 190 m or where the type, size and structural configuration demand.
The ShipRight notation FDA is not applicable to ships
approved using the IACS Common Structural Rules.
4.1.2 Where
an appraisal is requested for a higher level of fatigue performance
of the hull structure than that made for the assignment of the ShipRight
notation FDA, the relevant procedures for the application
of the ShipRight notation FDA plus() are to be applied.
The appraisal may be made based upon a specific trading pattern, which
is to be expressed in terms of either a Worldwide trading route, as
defined in the relevant ShipRight procedures, or a North Atlantic
trading route (that utilises the wave data from IACS Recommendation
34). The ShipRight notation FDA plus() is to be followed
by the number of years that the vessel has been assessed for the specific
trading pattern shown in brackets, for either the Worldwide or North
Atlantic trading routes, denoted by WW and NA respectively,
e.g. FDA plus(25, NA). This procedure is applicable to
all ships including those built in accordance with the IACS Common
Structural rules.
4.1.3 Where
an appraisal is requested for the fatigue performance of the hull
structure when navigating through ice, the relevant ShipRight FDA
ICE procedures are to be applied. Where the relevant procedures have
been applied the ShipRight notation FDA ICE will be assigned, see also
Pt 1, Ch 2, 2.3 Class notations (hull) 2.3.17.
4.1.4 Where
specified in the Rules an appraisal is to be made of the fatigue performance
of the hull structure taking into account of the effects due to the
continuous vibrational response of the hull girder in waves (springing)
in accordance with the relevant ShipRight procedures. Where the relevant
procedures have been applied the ShipRight notation FDA SPR will
be assigned, see also
Pt 1, Ch 2, 2.3 Class notations (hull) 2.3.17.