Hi All
Good Day
I am doing damage stability analysis for a LPG barge. Class notation is : C Hull + Machinery.My barge is without any double bottom, C type LPG cylinder is mounted on deck. I am just trying to check the result after a single compartment ( Largest compartment, in this case Void 3 (p)) damage)
Here attached of my tank plan and Damage case ( Damage case are defined as per IGC code)
After Run with loaded departure and Void 3 (p) damaged. I got below result
Loadcase - LD With 100% Consumables
Damage Case - Void 3 P/S
Free to Trim
Specific gravity = 1.025; (Density = 1.025 tonne/m^3)
Compartments Damaged -
Compartment or Tank Status Perm.% PartFlood.% PartFlood.WL
VOID 3 (P) Fully flooded 98
Fluid analysis method: Simulate fluid movement
Item Name
Quantity
Unit Mass
tonne
Total Mass
Unit Volume
m^3
Total Volume
Long. Arm
m
Trans. Arm
Vert. Arm
Lightship
1
492.390
28.305
0.000
2.039
APT (P)
100%
7.306
7.128
0.761
-3.735
2.628
APT (S)
3.735
BWT 1 (P)
20%
145.535
29.107
141.985
28.397
27.668
-2.466
0.355
BWT 1 (S)
2.466
FWT (P)
43.954
42.882
20.817
-2.522
0.995
FWT (S)
2.522
FOST (P)
98%
5.543
5.432
5.870
5.753
12.575
-4.098
2.690
FOST (S)
4.098
FORT (P)
17.435
17.086
18.464
18.094
12.583
-3.303
0.897
FORT (S)
3.303
BWT 2 (P)
59%
121.481
71.674
118.518
69.926
47.838
-2.528
0.969
BWT 2 (S)
2.528
Fuel Tank
3.443
3.646
52.067
1.600
Cargo Tank 1 (P)
99.845
97.848
181.537
177.906
22.142
-2.400
5.517
2.400
Cargo Tank 2 (P)
99.940
97.941
181.709
178.075
45.641
Cargo Tank 2 (S)
VOID 1 (P)
0%
28.114
23.041
-2.550
1.950
VOID 1 (S)
2.550
VOID 2 (P)
70.506
68.787
18.541
-4.544
0.021
VOID 2 (S)
4.544
VOID (C)
2.998
14.050
0.025
VOID 3 (P) (Damaged)
Damaged
VOID 3 (S)
189.345
44.032
3.364
FPT
50%
40.254
20.127
39.272
19.636
58.657
1.006
VOID 4 (C)
171.900
57.533
0.006
Total Loadcase
1256.658
1997.146
1079.602
31.390
2.813
Heel to Starboard
deg
-30.0
-20.0
-10.0
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
GZ m
-0.118
0.049
0.319
0.605
0.582
0.596
0.685
0.704
0.632
0.480
Area under GZ curve from zero heel m.deg
-1.8800
-2.0713
-1.6279
0.5801
4.8179
10.8963
16.6794
23.0879
30.1094
36.8615
42.4602
Displacement t
1257
Draft at FP m
3.709
3.482
3.035
2.837
2.787
3.067
3.204
3.184
2.983
2.604
1.901
Draft at AP m
2.516
2.293
2.214
2.259
2.219
2.276
2.495
2.595
2.585
2.401
2.003
WL Length m
61.372
61.436
61.736
61.211
61.733
61.735
61.732
61.731
Beam max extents on WL m
10.648
9.614
10.309
10.201
10.335
9.202
10.491
9.946
9.093
8.371
7.679
Wetted Area m^2
1257.170
1162.705
1007.452
920.384
960.116
1080.746
1190.312
1185.961
1153.659
1129.069
1125.729
Waterpl. Area m^2
439.835
399.680
472.390
538.032
483.430
348.532
383.610
361.373
335.144
306.920
281.573
Prismatic coeff. (Cp)
0.684
0.695
0.705
0.728
0.746
0.758
0.765
0.782
0.795
0.801
0.800
Block coeff. (Cb)
0.353
0.451
0.533
0.700
0.563
0.504
0.381
0.372
0.395
0.433
0.488
LCB from zero pt. (+ve fwd) m
31.438
31.423
31.421
31.404
31.415
31.417
31.409
31.398
31.388
31.379
LCF from zero pt. (+ve fwd) m
30.706
29.363
26.512
28.332
26.980
27.852
29.963
30.702
31.113
31.707
31.964
Max deck inclination deg
30.0143
20.0265
10.0287
0.5445
10.0138
20.0118
30.0051
40.0019
50.0004
60.0000
70.0000
Trim angle (+ve by stern) deg
-1.1243
-1.1201
-0.7738
-0.5445
-0.5355
-0.7458
-0.6687
-0.5555
-0.3746
-0.1910
0.0958
Key point
Type
Immersion angle
Emergence angle
Margin Line (immersion pos = 60.799 m)
0
n/a
Deck Edge (immersion pos = 60.799 m)
ER Vent (P)*
Downflooding point
Not immersed in positive range
ER Vent (S)*
ER Exhaust (P)*
ER Exhaust (S)*
66.5
Code
Criteria
Value
Units
Actual
Status
Margin
%
Regulation 28 GZ-based
28.3.2 Equi heel <= 25 or <= 30 if no DE immersion
Fail
Ratio of equilibrium heel angle to the lesser of:
spec. heel angle
shall not be greater than (<=)
100.00
-243.52
+343.52
or
Intermediate values
Equilibrium angle
-24.4
28.3.3 Range of positive stability including DF
Pass
from the greater of
angle of equilibrium
to the lesser of
first downflooding angle
angle of vanishing stability
shall not be less than (>=)
94.4
+371.76
28.3.3 Residual righting lever
in the range from the greater of
angle of max. GZ
47.3
0.100
0.708
+608.00
angle at which this GZ occurs
28.3.3 Area under GZ curve
spec. angle above equilibrium
20.0 (-4.4)
-4.4
1.0027
m.deg
1.1394
+13.63
Now my question is why the first criteria always fail?
Can anyone help me clarify this matter.
Thanks in advance
Farhad
Hi Farhad,
Is this a question for Maxsurf or for MOSES?
Hi Georgina,
This question is for Maxsurf. Could you please advice me any answer?
Thank You
Hi Farad,
Do You have a SELECT Subscription for MAXSURF (Annual Maintenance). If you do - This would be good to pop in as a Service Request so I can take a look at your model.
Is your damaged vessel heeling to Port or to Starboard? Under Analysis | Heel you can choose if your vessel is heeling towards the Port or Starboard side. As a Naval Architect you need to test your vessel in the worst heel direction. However if you heel in the wrong direction then things like your equilibrium position may not be calculated properly.
Take a look at the graph of your GZ curve to help understand what is happening.
Regards,
James
Hi James
Sorry I don't have that subscription.
However I tried to heel both way and got similar results with following error message
Can you advice me anything to resolve this error.
Thank youFarhad
Good morning, we have the same problem too.
Could you give us some answer to fix this problem?
This problem has been request by the register; ok for the max KG which are the really resaults, but we need to answer them.