2. MAJOR FEM ANALYSES
TOPSIDE STRUCTURAL INTEGRITY ANALYSIS
SPUD CAN ANALYSIS
JACKCASE ANALYSIS (Pinion and hydraulic)
CRANE PEDESTAL ANALYSIS
TRUNION ANALYSIS
SCF CALCULATION BY FEM
HELIDECK ANALYSIS
3. TOPSIDE STRUCTURAL INTEGRITY ANALYSIS
Project : Independent Verification Report- Structural integrity for Topsides and
lifting consoles
Client :Dry dock world Dubai
Finite element analysis and buckling calculation for Dolwin 2 semisubmersible
Topside and the analysis of Lifting consoles
Dolwin-2 topsides is a steel framed model with 89.7m length, 71.5m width and
19.5m height. It has three horizontal levels of deck framing-main deck level,
intermediate deck and weather deck.
Modelling and analysis is done in Abaqus 6.10-1
4. TOPSIDE STRUCTURAL INTEGRITY ANALYSIS
The 10,000 MT topsides of Dolwin-2 HVDC semisubmersibles are to be lifted
and mated on to the hull structure using ALE’s gantry system at Dubai Dry
docks.
The lifting of the Dolwin-2 topside is carried out using a gantry system with
hydraulic strand lift units positioned on top of beams above each of the four main
support towers and two A-frame supports.
12. Factored self weight and Wind load are considered for the analysis. The factors are
based on the DNV Rules for Marine operations.
Total load of the topside is increased by factoring the acceleration due to gravity
according to the different load cases.
For the local analysis of the Lifting Consoles,The sling reactions from the integrated
model applied at the anchor head of the lifting console as pressure load
For the structural integrity analysis of the topsides, the slings are modelled as axial
members along with the integrated topside model
18. SPUD CAN ANALYSIS
Project :OCD035-Design GPC JU 125/300
Client :GPC
Objectives:FEM analysis of Spud can
Spud can is the foundation of individual leg in Jack
up
Spud can diameter is 14m and height is
4.375m.Out of three One of the spud can is
modelled
Loads are applied according to ABS MODU part 3
and analysed for maximum reaction (6000T) from
in place condition
Modelling and analysis is done in Abaqus 6.10-1
25. JACKCASE ANALYSIS
Client :GPC
Objective:FEM analysis of Jack case
Jack case is a important structure for jack up rig.
The rising and lowering of leg and Rising and lowering of
hull are done by jacking system
Jacking system of GPC JU 125/300 is of pinion-electrical
motor type
Out of the three jack cases, one is modelled analysed for
critical consistent load sets
26. Critical load sets are identified from Global
inplace analysis, Ocean &Field tow analysis and
Maximum preload holding capacity
Modelling analysis and drawing preparation is
Critical
Worked along with ZPMC engineers for
Integrated analysis
The pinion loading is redefined to include the
local motor loading effects in the jacking frame.
JACKCASE ANALYSIS
30. CRANE PEDESTAL ANALYSIS
Project : OCD042 –Sagar Samrat Conversion ProjectClient : ONGC
Objective: FEM analysis of Crane pedestal
Crane pedestal is the foundation structure for crane. Modelling
and analysis done three time as per the changes in SHI dwg.
At the same time this crane pedestal is supporting the beams from the
technological structure. The connection is moving connection
33. JACKCASE ANALYSIS
Project : OCD042 –Sagar Samrat Conversion Project
Objectives:FEM analysis of Jack case
Out of four jack cases, one is modelled and analysed for critical load sets
It is hydraulic pin type jacking system
35. JACKCASE ANALYSIS
Modelling and analysis are done similar to the previous jacking system analysis
Challenge: Working with Old drawings
Here the jacking frame is absent
The loads from the hydraulic system is applied to the upper shock foundation to
simulate the real phenomenon
Lower and upper guide loads are applied as pressure. The loads are extracted
from Final Inplace analysis for different conditions.
40. TRUNION ANALYSIS
• Shell modelling
• Maximum Lifting load is considered
(2750T).
• In plane and out of plane loads are
considered for the analysis.
43. TRUNION ANALYSIS
The edges of the deck beams are pinned and the load is applied as pressure load for initial
analysis, and modified to line load later.
44. CRANE PEDESTAL ANALYSIS
Objectives: Crane pedestal analysis
Rated Capacity of Crane -55T
Pedestal is attached to the side shell
Pedestal is analysed for the maximum loads from the vendor: Modelling and
analysis are done similar to crane previous pedestal analysis
47. SCF CALCULATION BY FEM
Objectives: SCF calculation
A particular joint with chord and braces are modelled using shell elements
Axial load, inplane and out of plane bending loads are applied to calculate the
SCF
Pinned boundary condition is used at a distance equal to two bays
SCF= Hot Spot stress/Nominal stress
52. HELIDECK ANALYSIS
The helideck and its support structure is analysed in SESAM-Genie for various
loading conditions and loading combinations.
Different loading conditions are considered as per CAP 437
55. HELICOPTER DETAILS
The Helideck is designed considering the helicopter types SIKORSKY S61N and
SIKORSKY S92.
SIKORSKY S61N
Overall Length : 22.2 m
MTOM : 9.3 t
Landing Gear Separation : 4.27 m
SIKORSKY S92
Overall Length : 20.88 m
MTOM : 12.8 t
Landing Gear Separation : 3.18 t
