Page 21 - Impiantistica Industriale

The result of this stage was a higher level of confi- • Logistic and permits required to transport the
dence in the feasibility of a full modularisation ap- modules to site
proach, supported by cold-eye reviews on the exe- • Market inquiries for yard assembly, shipping,
cution risks and associated mitigations, with high staging and heavy lifting
emphasis on the out-of schedule scenarios. • Project schedule
As a consequence we received the technical ap- • Risk assessment on logistic aspects (out of
proval from owner to develop a FEED package for sequence)
full modularisation. • Detailed cost estimate

Stage 5 – Module definition phase The FEED book alternative case for modular
approach represented the completion of the
The module definition phase was carried out in stage 5. Credits and debits vs. the stick-built base
the second part of FEED with the support of long case approach were assessed in the final project
lead equipment bids, which included the option for estimate.
modularisation, the availability of consolidated plot The result was that with a modular approach sa-
plan, preliminary piping layouts, preliminary substa- fety and quality performance would increase (as
tion layout and civil pre-design. The module instal- expected) and cost and schedule would decrease.
lation sequence and shipping strategy was detailed The higher cost of modules and their transport is
and agreed during this stage. A plan for the enga- offset by the lower cost of performing work at the
gement of a heavy lift and transport contractor was fabrication yards and their higher productivity.
also defined. The limited area available at the refinery site, sur-
rounded by existing units in operation and the pre-
The output of this phase was: sence of several underground obstructions, would
• Layouts, foundations, steel structures, buil- originate a longer than usual duration of site prepa-
ding design, piping, instrument and electrical ration and civil works, with impacts on start of me-
equipment location and cable routing, all revi- chanical and E&I works in the stick-built case. The
sed to align to a full modularisation approach modular approach would instead decouple yard
• Modules index and datasheets mechanical works from civil works and mitigate the
• Ad-hoc EPC engineering, procurement, yard congestion issues, limited at the hook-up phase,
and construction execution plans with the result of an earlier project completion.
• Fabrication and yard assembly technical Because of the above reasons a full modular approach
packages was authorised for the funding of the EPC phase of
• Acceptance criteria for pre-assembled units the project and the stick-built case abandoned.

Impiantistica Italiana - Settembre-Ottobre 2017 19