GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 4 of 84
10.5
Installation vessel
39
10.6
DP systems (if applicable)
39
10.7
Mooring systems (if applicable)
39
11
STRUCTURAL CALCULATIONS
40
11.1
Codes and specifications
40
11.2
Load cases and structural modelling
40
11.3
Structure
40
11.4
Consequence factors
40
11.5
Lift
points
40
11.6
Spreader bars, frames & other structural items of
lifting equipment
41
11.7
Allowable stresses
41
11.8
Independent analysis
41
12
LIFT POINT DESIGN
42
12.1
Introduction
42
12.2
General design requirements
42
12.3
Lateral lift point load
42
12.4
Sling ovalisation
42
12.5
Padeyes
43
12.6
Cast Padears and welded trunnions
43
12.7
Inspection of lift points
43
13
FABRICATION YARD LIFTS
45
13.1
Introduction
45
13.2
Weight
and CoG
45
13.3
Additional loads
45
13.4
Dynamic loads
45
13.5
Load cases
46
13.6
Lifting equipment
46
13.7
Fabrication yard cranes
46
13.8
Operational and practical considerations for onshore lifts
46
14
FABRICATION OF RIGGING AND LIFTING EQUIPMENT
48
14.1
Introduction
48
14.2
Materials and construction of steel slings and grommets
48
14.3
Materials and construction of fibre slings and grommets
48
14.4
Materials and construction of shackles
49
14.5
Materials and construction of lifting tools
49
14.6
Materials and construction of spreader bars and spreader frames
50
14.7
Materials and construction of other lifting equipment
51
15
CERTIFICATION AND INSPECTION OF RIGGING AND LIFTING EQUIPMENT
52
15.1
Introduction
52
15.2
Certification, inspection and revalidation of slings and grommets
52
15.3
Certification and Inspection of shackles
54
15.4
Certification and Inspection of lifting tools
55
15.5
Certification and Inspection of spreader bars and spreader frames
55
15.6
Certification and Inspection of other lifting equipment
55
16
CLEARANCES
57
16.1
Introduction
57
16.2
Clearances around lifted object (floating crane)
57
16.3
Clearances around lifted object (jacked-up crane)
57
16.4
Clearances around crane vessel
58
16.5
Clearances around mooring lines and anchors
58
16.6
Clearances for fabrication yard lifts
58
17
BUMPERS AND GUIDES
59
17.1
Introduction
59
17.2
Module movement
59
GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 5 of 84
17.3
Position
of bumpers and guides
59
17.4
Bumper and guide forces
60
17.5
Design considerations
60
18
OPERATIONS AND PRACTICAL CONSIDERATIONS
62
18.1
Organisation, planning and documentation
62
18.2
Safety
64
18.3
Weather-restricted operations and weather forecasts
64
18.4
Environmental design criteria
64
18.5
Survey and positioning
64
18.6
Vessel motions and operational details
64
18.7
Safe access
65
18.8
Loose equipment
65
18.9
Seafastening removal and lifting operations
65
18.10 Slings & shackles
66
18.11 Spreader bars and spreader frames
68
18.12 Load and motion limiting systems
68
19
INSTALLATION OF SUBSEA EQUIPMENT
69
19.1
Scope
69
19.2
Design principles
69
19.3
Subsea lifting requirements (additional to those in air)
70
19.4
Deployment system
71
19.5
Positioning and landing
71
19.6
ROV systems
72
19.7
Testing
72
19.8
Suction piles & foundations
73
19.9
Driven anchor piles
73
19.10 Jumpers and tie-in spools
74
19.11 Rigid pipe riser installation
74
19.12 Subsea storage tanks
75
REFERENCES
77
APPENDIX A - INFORMATION REQUIRED FOR APPROVAL
78
APPENDIX B - GUIDELINES FOR DERIVATION OF DESIGN LOADS
81
TABLES
Table
4-1
Typically Required Surveys
20
Table
5-1
Dynamic Amplification Factors (DAF) in Air
24
Table
7-1
Bending Factors
33
Table
11-1
Consequence Factors
c
40
Table
17-1
Default Bumper & Guide Forces (Offshore)
60
FIGURES
Figure
5-1
Lift Calculation Flowchart
22
Figure
6-1
Resolving Sling Loading
29
Figure
12-1
Indicative shaping of padear bearing surface
43
Figure
B-1
Derivation of Tilt Factor for CoG Below Lift Points
82
Figure B-2
Derivation
of Lift Point Loads
83