Page 20: of Maritime Reporter Magazine (July 1978)

THE PRECISION

DUCTED

PROPELLER SYSTE

BY BYJfc C

V/Z/////M/// 1. Save Fuel Costs with retro-fit: Run engine at lower RPM and lower HP, but achieve the same thrust and speed. 2. Increase dragging, towrope and bollard pull but keep the same speed and fuel usage. 3. Increase speed but keep the same thrust and fuel consumption.

That's why it is no accident that more and more builders and owners of

River Towboats, Ocean Tugs, Harbor Tugs and small Tankers specify the

Columbian Precision Ducted Propeller System. They know that with a

Columbian System astern they will beat the cost of downtime, frequent overhauls and repairs, because we stress optimum engineering. Our plate thicknesses, certified welding, insulated rings, heavy-duty ribbing and proper propeller selection all combine to avoid the common problems of cavitation, warpage, flexing electrolysis, leakage, corro- sion, puncture and inefficient performance.

FULL RANGE OF PROPELLER STYLES • Standard and Custom-built propellers for every type of commercial vessel. • Available in Stainless Steel, NIBRAL and

Manganese Bronze • Manufactured to ABS, USN, USCG and

ISO specifications.

Write for FREE Ducted-Propeller System Recommendation.

Standard Nozzle sizes range from 24" dia to 110" dia. Larger ducts available on request

V///////J&/S/// BRONZE CORPORATION 216 N. Main St., Freeport, N.V. 11520 (516) 378-0470

Precision Propulsion for the Marine Industry Since 1901

Propellers - Bearings - Shaft Line Equipment - Hydraulic Controls

SALES SERVICE

The Ultimate Navigation Computer!

The CC-2 From Simrad • Displays position in Latitude/Longitude. • Computes course to steer with up to 9 "Way Points". • Displays Time and Distance To Go and True Ground Speed. • Easy to operate. • May be used with ANY Simrad Loran-C receiver.

Contact NAV-COM For The Special

LC-204/CC-2 Introductory Package Price. 14

NAV-COM Inc., 2 Hicks Street, North Lindenhurst, N.Y. 11757 (516) 884-7672

For more information, call Gerry Gutman, Al Carlson, or Jack Provenzano.

Bethlehem Beaumont Shipyard

To Build Offshore Rig For

Houston Offshore International

Houston Offshore International, Inc. has ordered construction of an offshore oil drill- ing rig from Bethlehem Steel Corporation's

Beaumont, Texas shipyard.

Announcement of the contract was made by Jerry E. Chiles, president of Houston

Offshore, and Barry Long, acting general manager of the yard.

The new rig, which is the third offshore rig ordered in three years by Houston Off- shore, will be a jackup designed to operate in up to 200 feet of water. Work will begin this summer, with delivery scheduled for

May 1979.

Artist's rendition shows design of the cantilevered offshore drill rig that Bethlehem Steel Corporation's shipyard in Beaumont, Texas, will build for Houston

Offshore International, Inc. Work on the rig will begin this summer, with delivery scheduled for May 1979.

The unit will be similar to previous deep- water Bethlehem-designed, mat-supported jackup drill rigs but will have a cantilevered drill floor. This feature permits exploratory or developmental drilling from 15 feet to 45 feet aft of the platform while cantilevered over existing wellhead structures. With hook plus setback loads of 1 million pounds and full-size drilling equipment, the rig will be ideally suited for deep-well drilling in water depths ranging from 11 feet to 200 feet.

Mr. Chiles noted that the new rig for his company is only the second of its kind on order. He said, "We believe this unique de- sign will give Houston Offshore the utmost flexibility in serving the needs of our oil company customers in the Gulf Coast area."

The drilling unit will provide onboard, air-conditioned living accommodations for 52 employees.

The rig will consist of a buoyant upper platform hull 157 feet long by 132 feet wide supported by a mat foundation 220 feet long by 185 feet wide. Three 11-foot-diameter columns affixed to the mat and passing up through the platform will provide the means for the platform to be jacked above offshore waters to provide sufficient wave clearance.

Maritime Reporter/Engineering News