Comparison between x1x1 system (MF04
-
221
-
01R0) and x1x2 (MF04
-
221
-
02R0)
No
x1x1 Option (MF04
-
221
-
01R0)
x1x2 Option (MF04
-
221
-
02R0)
1
Minimum Required Concrete
A x1x1 system required less minimum
concrete height. In this case, min.
required concrete heig
ht = 7300mm if
top elevation is fix at +9.00,
Minimum Required Concrete
A x1x2 system required much more
minimum concrete height. In this case,
min. required concrete height = 8325mm
if top elevation is fix at +9.00,
2
Performance of fender
Normal Comp
ression
Energy absorption = 1,750.84 kN
-
m
Reaction force = 2,345.25 kN
10° Horizontal Compression
(Berthing angle)
Energy absorption = 1,545.99 kN
-
m
Reaction force = 2,345.25 kN
5° Vertical Compression (Flare)
Energy absorption = 1,663.30 kN
-
m
Reaction fo
rce = 2,345.25 kN
Hence, with similar energy absorption,
the reaction force of x1x1 system is
lower.
Performance of fender
Normal Compression
Energy absorption = 1,837.64 kN
-
m
Reaction force = 2,616.12 kN
10° Horizontal Compression
(Berthing angle)
Energy
absorption = 1,622.64 kN
-
m
Reaction force = 2,616.12 kN
5° Vertical Compression (Flare)
Energy absorption = 1,520.87 kN
-
m
Reaction force = 2,616.12 kN
With similar energy absorption, the
reaction force of x1x2 system is higher.
No
x1x1 Option (MF04
-
22
1
-
01R0)
x1x2 Option (MF04
-
221
-
02R0)
3
Cost of frame
Due to the lower reaction force and
moment on frame, weight of frame is
much lighter (2218 kg)
Cost of frame
Due to the higher reaction force and
moment on frame, weight of frame is
much heavier (4028 kg
)
4
Installation & Maintenance
Easier as it involves on 1 fender body
Installation & Maintenance
Tougher as it involves on 2 fender bodies
Why the energy absorption of a x1x2 system reduce much more than a x1x1 system
during 5° vertical compression (Fla
re)?
No
x1x1 Option (MF04
-
221
-
01R0)
x1x2 Option (MF04
-
221
-
02R0)
1
During 5° vertical compression from
flare, fender is compressed to the
maximum where energy absorption
=1,663.30 kN
-
m due to angular reduction
factor.
During 5° vertical compression fro
m flare, top
fender is compressed to the maximum but due
to the pitch of the fenders, lower fender is
compressed by lesser. Therefore, energy
absorption during 5° flare = 1,520.87 kN
-
m
which is much less than the total energy
absorption of each individual
fender under 5°
reduction factor.
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