Civil Engineering Reference
In-Depth Information
TABLE 5.3
Weight Allowances by Project Stage
Project
Stage
Allowance for
Topside (%)
Allowance for
Sub-structure (%)
Available Data
Conceptual
design
Historic volumetric
15
10
Vendor catalog
15
Vendor data/quotation
12
Calculated from material
take-off (MTO)
10
Historical weight for similar
equipment
5
Design change allowance
5
5
Fabrication change allowance
5
5
Detailed
design
Vendor catalog
15
5
Vendor data/quotation
10
Calculated MTO from
approved for construction
drawings
5
Design change allowance
5
5
Fabrication change allowance
5
5
Fabrication
Vendor data/quotation
5
3
Design change allowance
0
0
Fabrication change allowance
5
2
Hydrotest generally occurs during topside hook-up and commissioning and
includes weight contributions from all permanent and temporary facilities
together with all weight elements associated with hydrotesting.
●
Load-out is the condition that exists during the activity of loading out the
platform (topside, sub-structure) from the fabrication facility into the trans-
portation barge.
●
Lift weight exists during lifting of the structure. The lift weight includes the
weight of the structure with the weight of all equipment and bulks actually
being lifted. It should also include: all temporary lifting accessories, such as
lifting slings, shackles and support frames; tie-down and support beams; and
any shipped-loose items temporarily placed on the structure during lifting,
but excluding hook-up spools, infill steel or other items that are to be lifted
separately.
●
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