Hydrocarbon Processing - August 2021 - GP-13

SPECIAL FOCUS: SMALL-SCALE LNG
For a 60,000-tpy, small-scale LNG
plant, the most appropriate module
transport envelope size was identified
to be 14.6 ft wide × 14.6 ft high × 80
ft long. This transportation constraint
fits most global inland transportation
infrastructures, normally requiring only
minimal permits. For smaller plant capacities,
modules of 8 ft wide × 8 ft high
× 40 ft long are being used, requiring no
special permitting.
The modular layouts produce a percent
modularization (amount of labor
moved offsite compared to traditional
stickbuilt designs) of approximately
75%-80%. FIG. 5 illustrates the conceptual
layout for a 60,000-tpy, small-scale
LNG plant and identifies the plug-andplay
module definitions and numbering.
Modularization typically results in
capital cost savings of 15% compared to
a traditional stickbuilt execution. This
number will vary in different locations
depending on the craft labor cost and
site productivity. An additional advantage
of a modular plant is the ability to
easily relocate the plant, if required.
Execution. Lean execution methods
were used, including standardization and
modularization, that provide program
flexibility and scalability, cost and schedule
certainty and overall schedule reductions.
This section reviews the details on
how this approach achieved a lean project
execution.
Plug-and-play modules. The use of
lean-designed, standardized, modular
units allows for multiple plants to be built
First small-scale LNG plant-Original capital cost
Two or more standardized, small-scale
LNG plants-10%-20% reduced capital cost
Plant price
Standardized engineering-approximately 60% home office
Cost savings = 4%-7% TIC reduction
Standardized equipment/tagged items-approximately
10%-15% equipment cost savings = 2%-5% TIC reduction
Standardized fabrication/assembly-approximately
5%-10% module cost savings = 2%-4% TIC reduction
Standardized construction-approximately 5%-10%
construction cost savings = 2%-4% TIC reduction
FIG. 4. Standardization ( " design one, build many " ) concept.
using standardized, plug-and-play process
or utility modules. Each standard process
module can be easily plugged in, depending
on the operating requirements. For example,
if local power is not available and
electrical generation is required, then the
appropriate electrical generator blocks can
be plugged into the facility. Onsite LNG
storage can be added by plugging in standard
storage units. Utilities can be added
by plugging in standard utility modules.
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Gas Processing & LNG | JULY/AUGUST 2021 13
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Hydrocarbon Processing - August 2021

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