Dulang Redevelopment (Phase 1) Analysis Result and proposed mitigation.ppt

Dulang

1. DULANG-A
Location
No. of item do not
meet code check
requirement
Remarks
Item
description
No.
Topside
Upper Deck Member UC >1.0 1 Primary Beam at west of Upper Deck. The member UC >1.0 due
to PAR loads. Strengthening is required.
Row B Member UC >1.0 1 Diagonal Truss member at Row B below skid beam. The member
UC > 1.0 due to KM-1 rig mud package weight. Strengthening is
required.
Substructure
EL (+) 3.658m Member UC >1.0 1 The members UC >1.0 due to updated metocean data
Reduction of Corrosion Allowance
EL (+) 3.658m Member UC >1.0 1 The members UC >1.0 due to updated metocean data
Reduction of Corrosion Allowance
Summary of Analysis Findings:-

2. Member
Member
Group
Max UC
Load

Case
Member
Section
Location Remarks
Strengthening with
Channel section
Strengthening
with built –up tee
section
Upper Deck
9513-9512 G0 1.262
<1.19>
OP13 W36x135 Primary beam at
west of Upper
Deck.
Mitigation required
as UC exceeded
code check due to
the PAR pin load

9513-9000 K2 1.461
<1.35>
OP1860.96 Ø cm
x 3.175 cm
Diagonal Truss
member at Row B
below skid beam.
Mitigation required
as UC exceeded
code check due to
the PAR pin load

TOPSIDE
Dulang A
Note: < > denotes refined UC

3. Length = 5m
Beam : W36 x 135 - Strengthened with built –up tee section
Dulang A
Built-up
Tee
Added

4. Length = 3m
Tubular : 609.6mm x 31.75mm w.t - Strengthened with Channel section

Dulang A
Channels
Added

5. Member
Member
Group Max UC
Load

Case Member Section Location Remarks
Reduction of
Corrosion
Allowance
*22- 20 E33 1.001 OP15 26.705 Ø cm x
0.627cm
Caisson Stub
EL (+) 3.658
Mitigation is
required.
Corrosion
allowance reduced
from 6 to 3mm.
New UC = 0.67
*113- 124 ET2 1.130 OP19 21.907 Ø cm x
0.952cm
Electrical Tube
Stub
EL (+) 3.658
Mitigation is
required.
Corrosion
allowance reduced
from 6 to 3mm.
New UC = 0.85
SUBSTRUCTURE
MEMBER U.C
Dulang A

6. DULANG-B
Location
No. of item do not
meet code check
requirement
Remarks
Item
description
No.
Topside
Production Deck Row L-6 Member UC >1.0 1 The members UC >1.0 due to PAR loads and KM-1 rig mud
package weight.
Production Roof Deck at
EL. (+) 26500mm
Member UC>1.0 6
Member Vertical
Deflection >
Allowable
1
The member UC >1.0 due to PAR loads and KM-1 rig mud
package weight.
Substructure
Seadeck at EL. (+) 3.658mMember UC>1.0 2 The members UC >1.0 due to updated metocean data and new
full dynamic inertia load.
All the members are located at splash zone with 3mm and 6mm
corrosion allowance considered in the analysis.
Joint UC>1.0 4
Row A Member UC>1.0 1
Row B Member UC>1.0 2
Row 2 Member UC>1.0 2
Row 3 Member UC>1.0 2
Pile & Foundation Pile UC>1.0 NilThe foundation FOS (1.96) < 2.0 for operating condition due to
updated metocean data and new full dynamic inertia load.
Fdn FOS<2.0
Fdn FOS<1.5
1
Nil
Summary of Analysis Findings:-

7. Member
Member
Group
Max
UC
Load


Case
Member
Section
Location Remarks
Strengthening
with skid beam
extension
Strengthening
with built –up
tee section
8316-9834 M3C 7.70CS02 W24x68
Cantilever beam at row
L-6, west of Production
Roof Deck.
The bending
stress in major
axis of the
members do not
meet code check
requirement.
Mitigation is
required.

9834-9831 M3C 6.99OP19 W24x68
Cantilever beam at row
L-6, west of Production
Roof Deck.
8315-9830 M3A 1.67OP14 W24x94
Cantilever beam at row
L-6, east of Production
Roof Deck.

8329-9835 M3C 1.48OP16 W24x68
Cantilever beam in
between row L-5 & L-6,
west of Production Roof
Deck.
8314-982Y M3A 1.60 OP13 W24x94
Cantilever beam at row
L-5, east of Production
Roof Deck.
9832-9836 M3D 2.92OP16 W18x35
Secondary beam at west
of Production Roof
Deck.
9836-9831 M3D 11.95OP11 W18x35
Secondary beam at west
of Production Roof
Deck.
TOPSIDE
Dulang B

8. 1
1
1
1
1
1
1 1
1 1
This W24x94 to
be replaced with
beam same size
as skid beam.
Beam : W24 x 117 & W24x68 - Strengthened with built –up tee section
Section 1-1
Dulang B
Built-up
Tee
Added

9. JACKET
LINK
Dulang B

10. DULANG-C
Location
No. of item do not
meet code check
requirement
Remarks
Item
description
No.
Topside
Upper Deck (9030-9034) Member UC >1.0 1 Primary Beam at west of Upper Deck. The member UC >1.0 due
to PAR loads. Strengthening is required.
Row B (8001-9030) Member UC >1.0 1 Diagonal Truss member at Row B below skid beam. The member
UC > 1.0 due to PAR loads. Strengthening is required.
Substructure
Row 1 (2000-1220) Member UC >1.0 1 The members UC >1.0 due to updated metocean data
Direction Sectors wave is considered for STORM
CONDITION only
Row 1 (3251-4000) Member UC >1.0 1 The members UC >1.0 due to updated metocean data
Direction Sectors wave is considered for STORM
CONDITION only
Row 1 (3251-4900) Member UC >1.0 1 The members UC >1.0 due to updated metocean data
Direction Sectors wave is considered for STORM
CONDITION only
Summary of Analysis Findings:-

11. TOPSIDE
Member
Member
Group
Max UC
Load


Case
Member
Section
Location Remarks
Strengthening with
Channel section
Strengthening with
built –up tee section
9030-9034 W33 1.280
<1.24>
OP13 W36x135 Primary beam
at west of
Upper Deck.
Mitigation required as
UC exceeded code
check due to the PAR
pin load

8001-9030 T01 1.264
<1.15>
OP1860.96 Ø cm x
3.175 cm
Diagonal
Truss member
at Row B
below skid
beam.
Mitigation required as
UC exceeded code
check due to the PAR
pin load

Dulang C
Note: < > denotes refined UC

12. Length = 5m
Beam : W36 x 135 - Strengthened with built –up tee section
Dulang C
Built-up
Tee Added

13. Length = 3m
Tubular : 609.6mm x 31.75mm w.t - Strengthened with Channel section

Dulang C
Channels
Added

14. SUBSTRUCTURE
Member
Member
Group
Max UC
Load

Case
Member
Section
Location Remarks
Direction Sectors wave is
considered for STORM
CONDITION only
2000-1220 Y02 1.027 ST1466.040 Ø cm
x 2.54 cm
Diagonal member at Row 1
between EL. (-)48158mm
and EL. (-) 77500mm.
Mitigation is
required
To be mitigated
New UC = 0.75
3251-4000 Y12 1.017 ST14 45.72 Ø cm
x 2.54 cm
Diagonal member at Row 1
between EL. (-)9144mm
and EL. (-) 27127mm.
Mitigation is
required
To be mitigated
New UC = 0.76
3251-4900 Y15 1.001 ST07 45.72 Ø cm
x 2.54 cm
Diagonal member at Row 1
between EL. (-)9144mm
and EL. (-) 27127mm.
Mitigation is
required
To be mitigated
New UC = 0.94
MEMBER U.C
Dulang C

15. Row 1

Dulang C

16. DULANG-D
Summary of Analysis Findings:-
Location
No. of item do not
meet code check
requirement
Remarks
Item descriptionNo.
Topside
Upper Deck and Row B Member UC >1.0 1 The members UC >1.0 due to PAR loads and KM-1 rig mud
package weight. Strengthening is required for this member.
Row B Member UC >1.0 1 The members UC >1.0 due to PAR loads and KM-1 rig mud
package weight. Strengthening is required for this member.
Substructure
Pile & Foundation Pile UC>1.0 NilThere are two foundations with FOS < 2.0 (A1=1.91 & B1=1.94) for
operating condition with rig load. Ageing effect study for pile ultimate
capacity is to be carried out. A 5% increment in the pile capacity is
needed to achieve FOS of 2.0.
Fdn FOS<2.0
Fdn FOS<1.5
2
Nil

17. Member
Member
Group
Max UC
Load

Case
Member
Section
Location Remarks
Strengthening with
channel section
Strengthening
with built –up tee
section
Upper Deck
8001-9030 T01
1.284
<1.104>
OP18
60.96 Ø cm x
3.175 cm
Truss member at
Row B below skid
beam.
Mitigation required
as UC exceeded
code check criteria
due to PAR pin load

9030-9034 W33
1.254
<1.220>
OP13 W36x135
Primary beam at
west of Upper Deck.
Mitigation required
as UC exceeded
code check criteria
due to PAR pin load

TOPSIDE
Note: < > denotes refined UC
Dulang D

18. 1 1
Beam : W36 x 135 - Strengthened with built –up tee section
Section 1-1
Dulang D
Built-up
Tee
Added

19. Section 2-2
Tubular : 609.6mm x 31.75mm w.t - Strengthened with Channel section

Dulang D
Channels
Added