North Sounder
(continued from page 41)
The recovery system consists of
two conveyor units. The debris col-
lection unit is a stainless steel
conveyor that leads up to the de-
bris collection equipment. The oil-
handling unit is a powered, 37V2-
foot-long by 6-foot-wide PVC belt
that loads oil into the vessel's
cargo tanks. The belt is driven by
a Char-Lynn hydraulic motor. The
dynamic inclined plane (DIP) con-
veyor is located in the forward
half of the hull, behind the debris
conveyor.
PEMEX 652
Matsumoto Shipyards
The aluminum-hulled fireboat
Pemex 652 was delivered at mid-
1983 by Matsumoto Shipyards of
Vancouver, B.C., Canada to Pe-
mex, Mexico's national oil com-
pany. This is the first of two sister
ships of a new design ordered by
Pemex for use in the extensive
Gulf of Mexico oil tracts owned
and managed by the company.
These two Pemex fireboats are
among the largest in the world.
Each contains about 170 tons of
aluminum plate and 30 tons of
aluminum extrusions supplied by
Alcan Canada Products, Ltd.
The 500-gt Pemex 652 has an
overall length of 150 feet, a beam
of 32 feet and a height from the
deck to the top monitor of 40 feet.
Operating draft is 11.8 feet, cruis-
ing range is 250 miles, and top
speed is 16 knots.
The vessel is powered by two
MTU diesel engines, each with an
output of 1,725 bhp at 1,400 rpm.
Two Reintjes reduction gears
transmit the power to the two Os-
borne propellers.
Twin Worthington pumps pow-
ered by separate 1,200-bhp MTU
diesels are capable of drawing sea
water, mixing it with a 3-percent
AFFF foam solution, and spraying
it onto fires at a rate of up to
25,000 gpm. The three main mon-
itors (nozzles) manufactured by
the Swedish Foam Fire Extin-
guishing Company can each han-
dle 5,200 gpm. Cranes can position
two more Stang monitors 75 feet
above the water surface to handle
2,600 more gpm. The vessel car-
ries 6,000 gallons of foam concen-
trate to mix with the water.
The hull of the fireboat is con-
structed of a special Alcan alloy
that includes magnesium and
manganese. Pemex specified alu-
minum because of its light weight
and because the high superstruc-
ture of the vessel would have been
impossible without it. Aluminum
is also corrosion-resistant, even in
salt water, so maintenance can be
kept to a minimum.
In use, the fire-fighting power of
the Pemex 652 is controlled from
the bridge, which also contains the
latest in navigation equipment,
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radiotelephone, depth sounder, ra-
dar, loudhailer, engine controls,
and hydraulic steering controls.
Schottel bow and stern thrusters
enable the vessel to maneuver
with ease. This permits precise
station-keeping and allows the fire-
fighting equipment to be posi-
tioned quickly and to the best
advantage.
PEMEX 652
Major Suppliers
Main engines (2) MTU
Reduction gears (2) Reintjes
Propellers (2) Osborne
Engine controls Kobelt
Pumping engines (2) MTU
Generator sets (2) Caterpillar
Thrusters (2) Schottel
Steering gear Wagner
Cranes & davits Kingsway
Anchor windlasses . . . Harrison & Robbins
Pumps Jabsco, Paramount
Rotoking, Worthington
Internal fire-fighting (Halon) .... Svenska
Inflatable rafts Beaufort
Radar, echosounder, gyrocompass .Sperry
VHF & SSB Canadian Marconi
Fenders Seaward
Coatings International Paint
ROWAN GORILLA I
Marathon LeTourneau
The Rowan Gorilla I, largest off-
shore jackup drilling rig ever built,
was delivered in December 1983
by Marathon LeTourneau to Ro-
wan Companies, Inc. of Houston.
Designed by Marathon and built
at its Marine Division in Vicks-
burg, Miss., it is the first of the
new Gorilla Class jackup designed
for operating in hostile offshore
areas.
Because of restrictive bridge
clearances, the rig was towed from
Vicksburg to Belle Chasse, La.,
minus its full length of legs and
its drilling derrick. After final out-
fitting the rig left Belle Chasse
under tow of the Chignecto Bay
and the Mahome Bay (photo),
11,000-bhp vessels that will serve
the rig as both tugs and supply
vessels.
The Rowan Gorilla I is sched-
uled to begin its first drilling as-
signment offshore eastern Canada
in mid-January for a consortium
of Canada-based oil companies in-
cluding ATS Exploration Ltd., Bow
Valley Industries, Ltd., and Husky
Oil Operations Ltd.
Fully outfitted with its three
(continued on page 46)
12
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