Page 42: of Maritime Reporter Magazine (January 1984)

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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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

Circle 109 on Reader Service Card Maritime Reporter/Engineering News