Page 20 - Impiantistica Industriale

TRANSPORTATION AND LIFTING REQUIRE- lability
MENTS • Identification of long lead items
• transportation methods, transportation costs, • Weather and seasonal restrictions for shipping
transportation infrastructure, permitting, risks and transportation
of loss during transportation, impacts of wea- • Conceptual module layout
ther conditions, insurance and warranties du- • High level risk assessment
ring transport, availability of lifting and hauling
equipment, foundations required for pre-work The result of this stage was that the Cogen Project,
items, heavy lifts and related planning. if executed with a modular approach, would provi-
de a cost and schedule advantage, provided that a
SUPPLIER CAPABILITY temporary gate for module delivery would be crea-
• availability of qualified suppliers, shop capa- ted and the substation was also modularised. Both
city, supplier’s information systems, supplier’s required approval by the end user.
availability of on-site representation.
The output from the modularisation tool is a nume- Stage 4 – Module proving study
rical value derived from weighted scores for the key During this stage, key modules were studied and
drivers. Following an initial ranking using the default philosophies for civil, structural, E&I (electrical &
weightings, sensitivity analysis was undertaken by instrumentation), equipment design and procu-
varying the prime drivers of labour, cost, site attri- rement and HSE (health, safety and environment)
butes and transport & lifting. developed. More clearly defined module weights
A numerically positive output indicates an overall and dimensions, and construction and logistics
benefit of modularisation, in which case, the next strategies provide a basis for a more detailed cost
stage on the road map, the “Module Quantification estimate and a definition of the extent of modulari-
Study”, shall be undertaken. sation that can be achieved.
The final CII Strategic Decision Tool for PPMOF
score of the study was good, meaning modularisa- The typical desired output of the proving study is:
tion was a desirable strategy for the Cogen Project. • Confirmed extent of modularisation
• Cost, schedule and risk assessment
Stage 3 – Module quantification • Installation sequence
Site plans (with module identification)
•
study • Preliminary module index (type, size, weight,
installation method)
A high level cost and schedule comparison was • Critical lift / transport studies
undertaken between “stick-build” and different le- • Module layout philosophy (size, weight range,
vels of modular construction relating to: module types, content, structural grid, opera-
• Full system optimised approach – complete or tion / maintenance access)
large section of process system contained in • Structural design philosophy
single module; • Civil design philosophy (site grading, spill con-
• Partial system optimised approach – as full tainment, underground impacts, foundation
system optimised, but with site installation of impacts)
specific equipment (e.g. gas turbine genera- • E&I design philosophy (interfaces)
tors, compressors); • Packaged equipment design / supply philoso-
• Envelope constrained approach – module size phy
constrained by an existing obstruction (bridge • Rotating equipment design / supply philoso-
capacity, overhead cables, etc); phy
• Layout constrained approach – module con- • Static equipment design / supply philosophy
strained by a specific layout requirement (dressed vessels)
(equipment spacing, copy of existing plant, • HSE philosophy
etc).
However, we approached this stage in a more
The following information was considered: qualitative manner and used the majority of engi-
• Details of local infrastructure neering and design information from the ongoing
• Availability and cost of local labour, relative to FEED work to extrapolate data as necessary for the
cost of fabrication yard labour modularisation case.
• Local content requirements A fabrication yard study, supported by visits and
• High level desk top survey of fabrication yards transport route and shipping surveys were under-
and capability taken to support the selected modular approach.
• Jetty / berthing considerations A heavy lift and transportation contractor was en-
• Preliminary route and site survey gaged to advise on transport and installation me-
• Outline shipping and heavy lift equipment avai- thods.

18 Impiantistica Italiana - Settembre-Ottobre 2017