GUIDELINES FOR MARINE LIFTING & LOWERING OPERATIONS 0027/ND Rev 11 Page 78 of 84 APPENDIX A - INFORMATION REQUIRED FOR APPROVAL A.1. GENERAL INFORMATION REQUIRED A.1.1
Where approval is required, a package shall be submitted to the MWS for review, consisting of:
a.
Structural analysis report for structure to be lifted, including lift points and spreaders, as in
Sections 11 and A.2.
b.
Rigging arrangement package as in Section A.3.
c.
Details of the lifting vessel, cranes and mooring /DP systems as in Section A.3.3.
d.
The management structure, risk assessments and marine manuals /procedures as in Section
18.
e.
A site survey of the installation area covering the full area of any anchor pattern, carried out not
more than 4 weeks before the start of installation, shall be provided to verify the location of all
subsea infrastructure, debris and obstructions.
A.2. THE STRUCTURE TO BE LIFTED A.2.1
Calculations shall be presented for the structure to be lifted, demonstrating its capacity to withstand,
without overstress, the loads imposed by the lift operation, with the load and safety factors stated in
Section 5, and the load cases discussed in Section 11. The calculation package shall present, as a
minimum:
a.
A document clearly expressing the design basis
b.
Plans, elevations and sections showing main structural members
c.
The structural model. This should account for the proposed lifting geometry, including any
offset of the lift points
d.
The weight and centre of gravity, including justification of weight and centre of gravity, by
Weight Control Report or weighing report, as in Section 5.2. For subsea lifts the weight report
shall include the submerged weight and centres of gravity and buoyancy.
e.
For partly immersed and subsea lifts the requirements of Section 19.2 and 19.3 shall be
addressed.
f.
For subsea lifting or lowering the additional information covered in Sections 19.2.9 and 19.3.
g.
The steel grades and properties
h.
The load cases imposed
i.
The Codes used
j.
A tabulation of member and joint Unity Checks greater than 0.8
k.
Justification or proposal for redesign, for any members with a Unity Check in excess of 1.0.
A.2.2
An analysis or equivalent justification shall be presented for all lift points, including padeyes, padears
and trunnions, to demonstrate that each lift point, and its attachment into the structure, is adequate for
the loads and factors set out in Sections 5, 6, 11 and 12.
A.2.3
A similar analysis shall be presented for spreader bars, beams and frames.
A.2.4
Confirmation shall be presented, from a Certifying Authority, Classification Society or similar, that the
structure including the lift points and their attachments has been constructed in accordance with the
drawings and specifications before any operation commences. The acceptable condition of the
structure for the lifting operation will be based on certificates, test reports, survey reports and NDT
reports.
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