October 9, 2012
Classification society ABS has granted an
Approval In Principle (AIP) to a new liquefied
natural gas (LNG) and regasification articulated
tug barge concept introduced by Waller Marine
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.
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.