This is my portofolio about dynamic analysis

1. DYNAMIC ANALYSIS OF
XYZ WELLHEAD
PLATFORM BASED ON
API RP2A WSD
Kristoforus Satya Anggara
Depok, 2021
Music : Eyes on Me - FFVIII

2. REDESIGN
• XYZ wellhead platform must be redesigned due to failures
in fatigue analysis.
Tubular Member
Initial size
(in)
Redesign
(in)
OD T OD T
Jacket leg 45 0,875 48 2
Jacket bracing 21 0,875 30 1,5
Pile above
mudline
38 0,875 42 2

3. INTRODUCING
THE REDESIGN
XYZ
WELLHEAD
PLATFORM

5. MAIN DATA
1. Earthquake analysis data
2. Fatigue analysis data
Soil Type
Strength Level Earthquake (SLE) - 100 year
PGA (g) Damping Ration (%) Cx, Cy, Cz
A 0,198 5 1,0; 1,0; 0,5
Hi (ft) Ti (ft)
Wave Events for 10 years at a high angle against true
north (TN)
0o - 45o 46o - 90o 91o - 135o 136o - 180o
0,0 - 3,9 4,6 8083600 19296200 6714600 8996200
4,0 - 7,9 6,4 276740 660750 229880 308050
8,0 - 11,9 6,8 9336 22270 7752 10390
12,0 - 15,9 7,2 314 754 260 348
16,0 - 19,9 7,5 10 25 8 11
20,0 - 23,9 7,8 0 1 0 1
T O T A L 8370000 19980000 6952500 9315000

6. MAIN DATA
Clockwise angular direction against the x-axis (horizontal to the right).
3. Load out
Name
LOA
(m)
DWT
(ton)
Deck Strength
(t/m2)
BB21/22 92 11178 20

7. SEISMIC ANALYSIS

8. 1. Load factor for superelement
2. Gravity load
Superelement
(kips)
Base Shear
(kips)
Load
Factor
Error
X 4431,98 115,87 0,0618
0,11%
Y 4431,98 118,87 0,0634
Description Value (kips)
Element weight -3740,62
Marine growth weigth -285,27
Element buoyancy 1913,10
Marine growth buoyancy 237,85
Self-weight in fluid -2570,99
Equipment weigth -456,05
Live load storm conditions -240,00
Total equipment load and live load -696,05
Total gravity load -4431,98

9. 3. Superelement result
Seastate Basic Load Case Summary Relative to Mudline
Load
Case
Load
Label
FX FY FZ MX MY MZ Dead Load Buoyancy
kips kips kips kips.ft kips.ft kips.ft kips kips
1 BP 0,00 0,00 -111,99 -0,20 0,00 0,00 0,00 0,00
2 SW 0,00 0,00 -3735,93 -918,50 37,96 0,00 0,00 0,00
3 BCKB 0,00 0,00 -72,50 44,26 -1063,60 0,00 0,00 0,00
4 BHKB 0,00 0,00 -240,00 -0,50 0,00 0,00 0,00 0,00
5 BHLI 0,00 0,00 -83,15 -1216,20 50,84 0,00 0,00 0,00
6 EQCD 0,00 0,00 -145,26 2,71 1,71 0,00 0,00 0,00
7 EQMD 0,00 0,00 -43,15 0,71 -12,60 0,00 0,00 0,00
8 GRVX 1874,93 0,00 0,00 0,00 132741,30 -933,10 4025,88 2150,94
9 GRVY 0,00 1874,93 0,00 -132741,30 0,00 38,79 4025,88 2150,94

10. 4. Mass participation factor
MODE X Y Z
1 9,80E-01 4,20E-05 5,00E-06
2 9,80E-01 9,85E-01 1,00E-05
3 9,80E-01 9,85E-01 1,00E-05
4 9,80E-01 9,85E-01 1,00E-05
5 9,84E-01 9,85E-01 1,20E-05
6 9,84E-01 9,86E-01 1,30E-05
7 9,84E-01 9,86E-01 2,10E-05
8 9,86E-01 9,86E-01 8,40E-05
9 9,87E-01 9,87E-01 4,03E-04
10 9,87E-01 9,88E-01 5,63E-04
MODE X Y Z
11 9,87E-01 9,88E-01 8,60E-01
12 9,89E-01 9,88E-01 8,66E-01
13 9,89E-01 9,89E-01 8,66E-01
14 9,89E-01 9,90E-01 8,67E-01
15 9,89E-01 9,90E-01 8,67E-01
16 9,90E-01 9,90E-01 8,89E-01
17 9,90E-01 9,90E-01 8,89E-01
18 9,90E-01 9,90E-01 8,90E-01
19 9,90E-01 9,90E-01 8,90E-01
20 9,90E-01 9,90E-01 9,41E-01

11. 5. CQC
Description Value Unit
X - Direction Base Shear 116 kips
Y - Direction Base Shear 119 kips
X - Direction Overturning
Moment
1,08E+05 kips-in
Y - Direction Overturning
Moment
1,08E+05 kips-in
Z - Direction Vertical
Load
310 kips

12. 6. Member with maximum UC
7. Joint with maximum UC
Level Group Member Load Con. Unity Check
Heli Deck Leg DLH A04L-B04L 1 0,09
Main Deck Leg DLM 904L-A04L 1 0,15
Cellar Deck Leg DLC P2BW-904L 2 0,15
Jacket Leg L1B L2A6-L2A5 1 0,16
Jacket Bracing BR1 L2B5-XBB4 2 0,05
Pile Above Mudline P1A P1A6-P1A5 1 0,21
Conductor CON 0243-0188 1 0,2
Conductor Support CON 0188-0463 1 0,25
Joint
Diameter
(in)
Thickness Yield Stress Unity
Check
(in) (ksi)
0473 15 0,625 36 0,203
0234 30 1,500 36 0,180
0235 30 1,500 36 0,173
0237 30 1,500 36 0,172
0320 30 1,500 36 0,171

13. 8. Single pile analysis
Pile
Group
Pile
Penetration
Pile Axial
Capacity
Pile Axial
Load
Safety
Factor
(feet) (kips) (kips)
P1A 260,5 4241,77 213,82 19,84
P2A 260,5 4241,77 166,79 25,43
P1B 260,5 4241,77 163,43 25,95
P2B 261,5 4241,77 266,06 15,94
Pile
Group
Distance from
Pile Head (feet)
Pile
Stress UC
Maximum
P1A 2,6 - 96,4 0,401
P2A 2,6 - 96,4 0,229
P1B 2,6 - 96,4 0,229
P2B 2,6 - 96,4 0,371

15. Maximum Member UC
Maximum Joint UC

16. FATIGUE ANALYSIS

17. 1. Dynamic amplification factor (DAF)
H wave
(ft)
T wave
(detik)
Tn/T (Tn/T)2 DAF
0,0-3,9 4,6 0,3921 0,1537 1,1692
4,0-7,9 6,4 0,2818 0,0794 1,0812
8,0-11,9 6,9 0,2614 0,0683 1,0691
12,0-15,9 7,4 0,2437 0,0594 1,0596
16,0-19,9 7,8 0,2312 0,0535 1,0534
20,0-23,9 8,1 0,2227 0,0496 1,0493
24,0-27,9 9,1 0,1982 0,0393 1,0387

18. 2. Critical member due to fatigue
Joint Member
Group Joint Stress Con. Factors * (SCF)
Service
Life Status
ID Type AX-CR AX-SD IN-PL OU-PL (year )
L1A4
L1A4-
XBA4
XBA K 3,3 5,46 2,69 5,81 2,42
VERY
CRITICAL
L1A5
L1A5-
L1A4
L1A K 3,95 7,45 2,95 8,24 2,28
VERY
CRITICAL
L1B4
L1B4-
XB14
XB1 K 3,27 5,47 2,69 5,80 3,48
VERY
CRITICAL
L1B5
L1B5-
L1B4
L1B K 3,99 7,34 2,95 8,27 2,52
VERY
CRITICAL

19. 2. Critical member due to fatigue (cont.)
Joint Member
Group Joint Stress Con. Factors * (SCF)
Service
Life Status
ID Type AX-CR AX-SD IN-PL OU-PL (year )
L2A4
L2A4-
XBA4
XBA K 3,30 5,44 2,69 5,82 3,19
VERY
CRITICAL
L2A5
L2A5-
L2A4
L2A K 3,93 7,51 2,95 8,23 1,85
VERY
CRITICAL
L2B4
L2B4-
XB24
XB2 K 3,28 5,48 2,69 5,78 2,55
VERY
CRITICAL
L2B5
L2B5-
L2B4
L2B K 3,08 5,47 2,65 6,05 4,29
VERY
CRITICAL

21. LOAD OUT ANALYSIS

23. JACKET DATA
• Jacket weigth 2649,12 kips
• Jacket heigth 171,85 ft
• Jacket width 94,2 ft
OD 48 in
t 2 in
A 288,88 in²
Fy 36 ksi
E 29000 ksi
K 1
l 5 ft
r 16,8 in
π 3,14

24. SUPPORT CAN DATA
Type tubular
OD 48,000 in
ID 44 in
Fy 36 ksi
W 982,9944 lb/ft
t 2,000 in
A 288,88 in2
I 81533,49 in4
rx 16,80 in
E 29000 ksi
K 1
L 5 ft
# support can 10 can(s)
OD/t 24
BEAM DATA
Type W 40x593
Fy 36 ksi
W 592,08 lb/ft
Sx 2340 in3
Ix 50400 in4
E 2900 ksi
Aw 174 in2
rx 17 in
# beam 5 beam(s)

25. SKID SHOE

26. BOA BARGE 21/22

27. BOA BARGE 21/22 CONTAINER
Name Type Aft m Fore m F.Port m F.Stb m F.Top m F.Bott m
Unit
volume m3
1S Tank -0,001 -15,33 7,73 15,75 6,71 0 499,152
1C Tank -0,001 -15,33 -7,73 7,73 6,71 0 962,206
1P Tank -0,001 -15,33 -15,75 -7,73 6,71 0 499,152
2S Tank -15,33 -30,67 7,73 15,75 6,71 0 825,51
2C Tank -15,33 -30,67 -7,73 7,73 6,71 0 1591,319
2P Tank -15,33 -30,67 -15,75 -7,73 6,71 0 825,51
3S Tank -30,67 -46,00 7,73 15,75 6,71 0 824,972
3C Tank -30,67 -46,00 -7,73 7,73 6,71 0 1590,282
3P Tank -30,67 -46,00 -15,75 -7,73 6,71 0 824,972
4S Tank -46,00 -61,33 7,73 15,75 6,71 0 824,972
4C Tank -46,00 -61,33 -7,73 7,73 6,71 0 1590,282
4P Tank -46,00 -61,33 -15,75 -7,73 6,71 0 824,972
5S Tank -61,33 -76,67 7,73 15,75 6,71 0 825,51
5C Tank -61,33 -76,67 -7,73 7,73 6,71 0 1591,319
5P Tank -61,33 -76,67 -15,75 -7,73 6,71 0 825,51
6S Tank -76,67 -92,00 7,73 15,75 6,71 0 398,607
6P Tank -76,67 -92,00 -15,75 -7,73 6,71 0 398,607

28. BALLASTING
STEPS

29. FINAL BALLASTING STEPS

30. Equivalent Results Example
Draft Amidships (m) 2,94
Displacement (ton) 6606
Heel deg 0
Draft at FP(m) 2,938
Draft at AP (m) 2,943
Draft at LCF (m) 2,94
Trim (+ve by stern) (m) 0,005
WL Length (m) 78,35
Beam max extents on WL (m) 31,5
Wetted Area m^2 2858,729
Waterpl. Area m^2 2448,335
Prismatic coeff. (Cp) 0,888
Block coeff. (Cb) 0,888
Max Sect. area coeff. (Cm) 1
Waterpl. area coeff. (Cwp) 0,992
LCB from zero pt. (+ve aft) (m) -45,887
LCF from zero pt. (+ve aft) (m) -45,702
KB (m) 1,529
KG fluid (m) 6,317
BMt (m) 30,979
BML (m) 191,828
GMt corrected (m) 26,19
GML (m) 187,04
KMt (m) 32,507
KML (m) 193,357
Immersion (TPc) (tonne/cm) 25,095
MTc (tonne.m) 134,302
RM at 1deg = GMt.Disp.sin(1)
tonne.m 3019,464
Max deck inclination deg 0,0032
Trim angle (+ve by stern) deg 0,0032
STEP 1
Draft Amidships (m) 2,968
Displacement (ton) 6676
Heel deg 0
Draft at FP(m) 2,966
Draft at AP (m) 2,971
Draft at LCF (m) 2,968
Trim (+ve by stern) (m) 0,005
WL Length (m) 78,512
Beam max extents on WL (m) 31,5
Wetted Area m^2 2867,859
Waterpl. Area m^2 2453,068
Prismatic coeff. (Cp) 0,887
Block coeff. (Cb) 0,887
Max Sect. area coeff. (Cm) 1
Waterpl. area coeff. (Cwp) 0,992
LCB from zero pt. (+ve aft) (m) -45,885
LCF from zero pt. (+ve aft) (m) -45,696
KB (m) 1,544
KG fluid (m) 8,222
BMt (m) 30,704
BML (m) 190,922
GMt corrected (m) 24,026
GML (m) 184,243
KMt (m) 32,248
KML (m) 192,465
Immersion (TPc) (tonne/cm) 25,144
MTc (tonne.m) 133,704
RM at 1deg = GMt.Disp.sin(1)
tonne.m 2799,502
Max deck inclination deg 0,0033
Trim angle (+ve by stern) deg 0,0033
STEP 8

31. PUMPING

32. Ballasting Pumping Time Example
STEP 8
STEP 1
Compartment
Initial
Condition
(m3)
Finish
Condition
(m3)
Volume
Difference
(m3)
Pumping
Rate (m3/hr)
Ballasting
Time (hr)
Ballasting
Time
(minutes)
6S 98,356 78,685 19,671 500 0,0393 2
6C 189,599 151,679 37,920 500 0,0758 5
6P 98,356 78,685 19,671 500 0,0393 2
5S 179,927 143,941 35,986 500 0,0720 4
5C 346,841 277,473 69,368 500 0,1387 8
5P 179,927 143,941 35,986 500 0,0720 4
4S 179,809 143,848 35,961 500 0,0719 4
4C 341,069 277,292 63,777 500 0,1276 8
4P 179,809 143,848 35,961 500 0,0719 4
3S 230,156 258,926 28,770 500 0,0575 3
3C 457,532 494,966 37,434 500 0,0749 4
3P 230,156 258,926 28,770 500 0,0575 3
2S 230,306 287,883 57,577 500 0,1152 7
2C 443,957 554,946 110,989 500 0,2220 13
2P 230,306 287,883 57,577 500 0,1152 7
1S 105,677 128,093 22,416 500 0,0448 3
1P 105,677 128,093 22,416 500 0,0448 3
3827,460 3839,108 720,250 Max time 13

33. Ballasting Pumping Time Example (cont.)
STEP 8
Compartment
Initial
Condition
(m3)
Finish
Condition
(m3)
Volume
Difference
(m3)
Pumping
Rate (m3/hr)
Ballasting
Time (hr)
Ballasting
Time
(minutes)
6S 78,685 78,685 0,000 500 0,0000 0
6C 151,679 151,679 0,000 500 0,0000 0
6P 78,685 78,685 0,000 500 0,0000 0
5S 143,941 143,941 0,000 500 0,0000 0
5C 277,473 277,473 0,000 500 0,0000 0
5P 143,941 143,941 0,000 500 0,0000 0
4S 143,848 143,848 0,000 500 0,0000 0
4C 277,292 277,292 0,000 500 0,0000 0
4P 143,848 143,848 0,000 500 0,0000 0
3S 244,541 179,809 64,732 500 0,1295 8
3C 457,532 342,456 115,076 500 0,2302 14
3P 244,541 179,809 64,732 500 0,1295 8
2S 237,503 187,124 50,379 500 0,1008 6
2C 457,830 360,715 97,115 500 0,1942 12
2P 237,503 187,124 50,379 500 0,1008 6
1S 112,081 86,463 25,618 500 0,0512 3
1P 112,081 86,463 25,618 500 0,0512 3
3049,355 493,649 Max time 14

34. Conclusion

35. Conclusion (cont.)

36. Conclusion (cont.)
So, from the analysis of load out obtained ballasting process with one pump
capacity of 500 m3 / h on Boabarge 21/22 from the end of the jetty to the
midship of the barge takes 2 hours 31 minutes.

37. MORE INFORMATION
• You can access my paper in
https://its.academia.edu/KristoforusSatyaAnggara
• You can also email me in kristoforussatya1997@gmail.com