Our innovation delivers solution for offshore gas field development with safety, high efficiency, and high cost performance

LiBro® FLNG ConceptMODEC, Inc. (MODEC) has developed the LiBro® FLNG concept with Toyo Engineering Corporation (TOYO) and Nippon Kaiji Kyo-kai (ClassNK) as an economical solution for monetizing remote stranded offshore gas fields. The LiBro® FLNG concept applies MODEC’s LiBro® technology and Air Products’ Triple N² Expander Liquefaction technology (Air Products® AP-N LNG Process).Key features of the LiBro® FLNG concept are ;▶ High efficiency by application of LiBro®▶ High availability by proven equipment▶ Enhanced safety by use of N² refrigerant▶ Cost effectiveness by conventional ship hull design▶ Early delivery by Shipyard-friendly design

LiBro®

MODEC’s LiBro® technol-ogy is based on L ithium Bromide (Li-Br) Absorption Refrigeration. The LiBro® unit produces chilled water using waste heat from gas turbine exhaust.The Li-Br based Absorption Refrigeration unit is widely

used for centralized air conditioning application onshore. Over 10,000 Li-Br Absorption Refrigeration units have been delivered. The largest unit has successfully been in operation since 2007 and the performance of the unit is well demonstrated. MODEC developed the proprietary guide plates for the distri-bution of absorption solution onto the entire heat exchanging surface in order to achieve the expected chilled water generation

performance under sea motion conditions. The effectiveness and performance of the guide plate were demonstrated successfully using a full scale LiBro® unit and were confirmed through dynamic motion tests.

Process Configuration and PerformanceA schematic process flow diagram of the LiBro® FLNG concept is shown below (Fig.-1).

Fig.-1 : Flow schematic of the LiBro® FLNG

Chilled Water(From LiBro® Unit)

Chilled Water(From LiBro® Unit)

Combustion Air

LiBro® Unit

N2 RefrigerationSystem

Chilled Water(From LiBro® Unit)

LNG

C5+

C5+ Removal Column

C2-C4

C1

Coil Wound Heat Exchanger (CWHE)

Scrub Column

Gas TurbineFeed Gas

The LiBro® unit is integrated with Air Products® AP-N LNG Pro-cess and the chilled water produced in the LiBro® unit is used for precooling of the natural gas and cooling of N² refrigerant for improved LNG train efficiency. Produced chilled water is also used for cooling of the gas turbine combustion air for maximizing output of gas turbine driver. With the LiBro® unit integration, the

Safe and Efficient FLNG Solution

Safety ConsiderationThe LiBro® FLNG concept involves N² as refrigerant for natural gas liquefaction. N² is a non-flammable fluid and much safer compared to mixed hydrocarbon refrigerants.Air Products’ Coil Wound Heat Exchanger (CWHE) is used as the main heat exchanger for natural gas liquefaction. Air Products’ CWHE is widely applied with its robust design and high reliability. For the LiBro® FLNG concept, the CWHE shell is mechanically designed to withstand natural gas supply pressure against coil rupture scenarios.

Cost EffectivenessUtilization of an existing standard shipbuilding hull design as the basis will contribute to significant cost savings compared to a purpose designed and built hull. Air Products® AP-N LNG Process which uses non-flammable N² refrigerant will allow a more com-pact topside design on the limited available deck space for top-side equipment and piping because of reduced safety corridor requirements. In addition, the LNG production capacity can be maximized by the integration of the LiBro® unit. The LiBro® unit is compact and can be installed beneath the gas turbines. No ad-ditional deck space is required for installation.For the typical gas composition from an offshore gas field, the standard hull design (300m x 50m) will accommodate the topside facilities with LNG production capacity of 2.0 MTPA and LNG storage capacity of 160,000 m³.

Early DeliveryThe Shipyard-friendly design is adapted to the hull design of the LiBro® FLNG concept. Conversion of standard shipbuilding bulk carrier, instead of special purpose built hull, is considered as the basis of the LiBro® FLNG concept in order to realize early deliv-ery. IHI Marine United Inc. SPB ( Self-Supporting Prismatic-Shape IMO Type B ) Tank, which features ( 1 ) wide & flat upper deck to enable installation of the topside plant and ( 2 ) no sloshing with internal bulkheads construction to enable partial cargo opera-tion, are installed into the cargo space as LNG product storage and will also contribute to its early delivery.The LiBro® FLNG concept can be applied to both new built hull and existing hull conversions.

Typical Specification of LiBro® FLNGTypical specification of the LiBro® FLNG is summarized below. Maximum achievable LNG production capacity is 2.0 MTPA based on existing shipbuilding standard hull of “Setouchi-Max”size vessel. The LNG storage capacity can be adjusted flexibly to meet the capacity of offloading shuttle LNG carriers. The LNG offloading system can be selected for either Side-by-Side or Tan-dem per customer’s preference. Also the electrical motor driven LiBro®FLNG can be offered with high reliability and availability for smaller LNG production capacity.

Fig.-3 : Topside equipment layout of the LiBro® FLNG

Toyo Engineering Corporation2-8-1 Akanehama, Narashino-shi, Chiba 275-0024, JapanTEL: +81-47-454-1571FAX: +81-47-454-1164http://www.toyo-eng.co.jp

overall efficiency of LNG train is improved, greater gas turbine power is made available, and increased LNG production capacity with the gas turbines selected is achieved (Fig.-2).

Efficiency improved by LiBro® pre cooling

Efficient but Complicated and unsafe

Typically Considered for Large FLNGs

Typically Considered for Mid/Small FLNGs

Proposed as economical solution Safe, Simple & Robust, but Inefficient

MODEC Solution Safe, Simple, Robust, and Efficient

Simplify with Compromised Efficiency

90100 100

8772

80 8796

Cascade 2xN2 3xN2

Onshore Only

Flammable Gas Refrigerant

Plural Compressors in Series

LiBro®+3xN2

LiBro®+3xN2 GT Intake Air Cooled

SMRDMRC3MR

Fig.-2 : Comparison of LNG Production per GTG Selected

300m

50m

L-Size M-Size

Liquefaction Technology Air Products® AP-N LNG Process+ MODEC LiBro®

LNG Production Capacity 2.0 MTPA 1.6 MTPA

Refrigerant Compressor Driver Gas Turbine(PGT25+G4) Motor

LNG Storage Capacity 160,000 m3

LNG Offloading Side-by-Side or Tandem

Condensate Storage Capacity 20,000 m3

Condensate Offloading Conventional Floating Hose

Hull Size 300mL x 50mW

MODEC, Inc.Nihonbashi Maruzen Tokyu Building 4th & 5th Floors2-3-10 Nihonbashi, Chuo-ku, Tokyo 103-0027 JapanTEL: +81-3-5290-1200FAX: +81-3-5290-1501http://www.modec.com/

Safe and Efficient FLNG Solution

2014.02.20③FP

* LiBro is a trademark of MODEC, Inc., registered in Japan, U.S. and other countries.