American Oil and Gas Reporter - April 2015 - 106

SpecialReport: Offshore Tech Trends
vessel installed the mooring system, and Harvey Gulf's War Horse
and War Horse II vessels towed the hull 515 nautical miles to
location in February 2014, where it was upended, ballasted and
anchored in position with nine mooring lines.
The topsides were installed the following month. Crowley's
Ocean Wind and Pilot tug boats, and its Marmack 303 barge,
towed the production platform, which was installed by the Saipem
7000. Heerema's Balder conducted the heavy lifts, including recovering and hanging off the risers for connection to the FPS.
"The hull and FPS installations were very efficient," McEvilly reports. "Everything was performed as planned. That does not
happen without a lot of hard work from a lot of very capable people."
Two eight-inch subsea production flowlines and one eight-inch
water injection line tie to the FPS. The export system from the
FPS consists of two 12-inch oil and natural gas lines that span
16 miles before connecting to the 18-inch Williams Mountaineer
(oil) and Canyon Chief (gas) pipeline systems for transport to a
Chevron-operated shore terminal at Empire, La.
"Tubular Bells is our first FPS in the Gulf of Mexico, and the
first FPS built entirely in the United States," McEvilly relates.
"In fact, all aspects of engineering and constructing the project
were conducted almost entirely within the United States."
The Gulfstar One hull was fabricated at Ingleside and
Aransas Pass, Tx., and the topsides were constructed at
Houma, La., by Gulf Island LLC (topsides, living quarters and
hull section), Gulf Island Marine Fabricators (hull section and
water-tight flats), Gulf Marine Fabricators (hull fabrication),
Signal International (hull sections), Dolphin Services (hull spool
piping, topsides alloy spool piping, pipeline end terminals,
pipeline end manifolds, and in-line structures), Intermoor (suction piles), and NRG Manufacturing (subsea manifold and
chemical tanks). Wood Group Mustang engineered and designed
the topside facilities.
"Creating 7,000-plus direct and indirect jobs from the topsides
and FPS hull fabrication work in the United States certainly was
rewarding for Hess," McEvilly says. "We may not be able to make
that happen on every project, but we did on this one. It was satisfying to everybody in the group that we were able to help stimulate the area economies."
The hull measures 85 feet in diameter and weighs 15,000 short
tons, McEvilly says. The base operating crew, for both day and
night shifts, consists of 32 employees. A 50-man quarters also
has room for vendors and suppliers, McEvilly points out.

FIGURE 1
Subsea Umbilical, Riser
And Flowline Architecture

Subsea Architecture

Figure 1 shows a representation of the Tubular Bells subsea
infrastructure. It includes two drill centers, a manifold to accommodate future production tie-ins, more than 28 miles of dual flowlines, water injection line, and the umbilical.
Major contractors of the subsea architecture were Technip (design, engineering, fabrication and installation of flowlines, steel
catenary risers, pipeline end terminations, pipeline end manifolds,
106 THE AMERICAN OIL & GAS REPORTER

The 584-foot long hull is shown here in February 2014 as it was
making its way through Aransas Pass along a 515-nautical-mile
journey from Gulf Marine Fabricators' facility in Ingleside, Tx.,
to Mississippi Canyon 724. Once on location, the hull was upended, ballasted and moored in position.



American Oil and Gas Reporter - April 2015

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2015

Contents
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American Oil and Gas Reporter - April 2015 - Cover3
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