UFC 4-159-03
3 October 2005
Table 3-10. Conditions Requiring Special Analysis
FACTOR
SPECIAL ANALYSIS REQUIRED
Wind
> 45 mph for small craft
> 75 mph for larger vessels
Wind waves
> 1.5 ft for small craft
> 4 ft for larger vessels
Wind gust fronts
Yes for SPMs
Current
> 3 knots
Ship waves and passing ship effects
Yes for special cases (see
Kizakkevariath, 1989; Occasion,
1996; Weggel and Sorensen, 1984 &
1986)
Long waves (seiches and tidal waves or
Yes
tsunamis)
Berthing and using mooring as a break
Yes (see MIL-HDBK-1025/1)
Parting tension member
May be static or dynamic
Ship impact or other sudden force on the
Yes (if directed)
ship
Earthquakes (spud moored or stiff
Yes
systems)
Explosion, landslide, impact
Yes (if directed)
Tornado (reference NUREG 1974)
Yes
Flood, sudden water level rise
Yes (if directed)
Ice forcing
Yes (if a factor)
Ship/mooring system dynamically
Yes (dynamic behavior of ships at
unstable (e.g., SPM)
SPMs can be especially complex)
Forcing period near a natural period of the
Yes; if the forcing period is from 80%
mooring system
to 120% of a system natural period
Note: SPM = single point mooring
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