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Waller Marine, Inc. LNG ATB gets ABS Approval in Principle
October 9, 2012

Classification society ABS has granted approval in Principle (AIP) to a new liquefied natural gas (LNG) and regasification articulated tug
barge concept introduced by Waller Marine Inc, Houston.

The vessel has the ability to load LNG from existing LNG terminals, liquefaction facilities or traditional LNG carriers and transport the LNG
to existing tanks, traditional LNG carriers, trucks or marine vessels using LNG as a fuel. The barge also is equipped for regasification of
LNG directly to a pipeline or to a power plant. An additional feature will be the use of natural gas as a fuel in the dual fuel engines of the tug
to drive the tug-barge unit.

The benefit of the LNG Articulated Tug and Barge Regas Vessel (ATB RV) is that it allows LNG to be moved and delivered more efficiently
on a small-scale basis in locations where large LNG infrastructure would be cumbersome, costly and time consuming.
Liquified Natural Gas (LNG)
The principals of WMI have a long association with LNG ship transportation beginning with the construction of the Methane
Princess in the 1960's. This association progressed through the 1980's with the construction of the El Paso ships and investigation
and analysis of the different LNG containment systems for the US Maritime Administration.
The Company has participated in the rejuvenation of the LNG business in the early 2000's in the design of mini LNG systems
including export terminals, mini liquefaction facilities, storage, mini transport ships and ITBs and import terminals with regasification
facilities for fueling power plants.
Offshore Floating LNG Terminal
Margret Hill
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The barge will be fitted with independent Type "C" LNG tanks. To make most efficient use of the hull volume and maximize the
cargo-carrying capacity of the barge, bi-lobe tanks of maximum width are centered along the barge centerline. The cargo containment
system is split into four longitudinally located independent tanks, with each tank supported by a simple structure that isolates the tanks
from hull loads. According to Waller Marine, these tanks will be constructed of either 9 percent nickel steel or Stainless Steel AISI 304L
to contain the cargo at a minimum temperature of -163 degrees C.

ABS worked with Waller from the inception of the project and has been the primary certification body in carrying out reviews, including
conducting a program review.

"ABS has been a great resource in developing the LNG ATB RV product", says Vice President-Gas Solutions Bill Hutchins, Waller
Marine. "By conducting multiple meetings, including a HAZID (hazard identification), ABS has helped us to ensure safety and regulatory
aspects have been appropriately addressed."

"ABS has worked closely with Waller Marine through the development of the LNG ATB RV," says Roy Bleberg, Director-Engineering,
ABS Americas. "We are pleased to be part of a project with the potential to improve the environmental impact of hydrocarbon emissions."

Since AIP was granted, Waller Marine has moved into the detail design phase with a goal of creating multiple variations for clients
around the world.
LNG ATB Cutaway
Liquid Natural Gas (LNG)
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Image of rendering of Waller Marine's LNG ATB - Cutaway view
Image of rendering of Offshore floating LNG terminal
Large floating import terminal are a realistic alternative to
land-based facilities particularly when gas supplies are needed in
the vicinity of large populations and permitting is difficult.  WMI
has looked at the viability of large floating, moored concrete LNG
storage and regasification, sufficient to discharge Q Max tankers
and store up to 400,000 cubic meters of product.  

Taking the concept further, a combined cycle power plant can be
installed on the platform together with the utilization of generated
heat for regasification and the production of freshwater from low
quality steam.
Offshore gas liquefaction directly from the wellhead or from
associated offshore gas will play an important part of the future
supply of LNG to the worlds markets; particularly from stranded
gas resources in remote areas of the world or where more
conventional production is not feasible.

WMI is involved in the design and conversion of ships that have
capability to import gas from the wellhead or subsea manifold,
pre-treat the gas and liquefy it to LNG for transfer to transport
Image of rendering of the Margret Hill
Image of the Hoegh Galleon
Articulated tug and barge arrangement for lng storage, transportation and regasification
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