Page 75: of Maritime Reporter Magazine (August 1996)

NEW MARKETS

MOORING

AN FF50

Zafiro Producer began life as an 1,087 ft. (331.3 m) long tanker, 184 ft. (56 m) in the beam with a depth of 86.6 ft. (26 m). She has a storage capac- ity of 1,770,000 barrels of produced crude oil and 570,000 barrels of ballast water. Fully loaded, she draws 67.5 ft. (20.5 m). She was formerly classified as a Very Large Crude Carrier (VLCC).

Following conversion to an FPSO, she will be classed as an ABS A1 Floating Production and

Storage System (FPSS).

To keep the 268,000-dwt Zafiro Producer on sta- tion in 600 ft. (182.9 m) of water, Oceaneering

Production Systems designed a 12-point catenary chain and wire rope mooring system. The lines are attached to the vessel's hull by newly installed chain stoppers, three each at bow and stern on the port and starboard sides. Additional reinforce- ment was added at these points to transmit the line loads directly to the hull.

A portable hydraulic linear tensioner is required because the ship's mooring winches are not rated for the 1,660,000+ pound, 100 -year storm design loads of the chain stoppers.

The mooring lines range in length from 4,010 to 4,150 ft. to accommodates the slope of the seabed, which ranges from depths of 450 to 1,000 ft. Each I ine consists of an upper section of 3 7/8 in. QRQ-grade chain, a middle section of 3 7/8 in. wire rope and a lower section of 4 in.

QRQ-grade chain attached to a 65.6 or 78.7 (20 or 24 m) high holding power anchor.

The environmental forces in the Zafiro's vicinity arrive at the location with a high degree of consis- tency. They are dominated by a persistent swell from the southwest and a coastal current flowing toward the northwest. To minimize roll and heave, the ship is moored with its stern to the swell and the current on the starboard beam.

In this orientation, Zafiro Producer can accom- modate bow-to-bow mooring of shuttle tankers in tandem, down-current from the FPSO, so that the tankers would be carried away from the FPSO in the event of an emergency disconnection during offloading.

Connected to the FPSO by a single hawser line, the tanker(s) will orient with bow into the current, minimizing the load on the FPSO mooring system.

The anchors and mooring lines will be installed prior to the arrival of the FPSO with the upper ends of the lines buoyed with pendant lines. The preten- sioned lines will be passed by a support vessel to the FPSO where they will be secured in the chain stoppers and further tensioned by the portable line tensioner. wgust, 1996

GE Contract With IHI To Supply Gas

Turbines For Malaysian Barge-

Mounted Power Project

GE Marine & Industrial Engines (M&I) has contracted with IHI to provide two GE

LM2500 aeroderivative gas turbines for a barge-mounted power project in Malaysia.

The project is slated for commercial operation in 1997.

The two LM2500 gas turbine-generator sets will be built and provided by IHI for use by the Sabah Electricity Board (SEB). The gas turbines will run on distillate fuel in simple- cycle mode, with natural gas as a back-up.

The 40 megawatts of electricity generated by

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