Page 89: of Maritime Reporter Magazine (November 1988)

State Marine Resumes Marketing

And Full Operation Of All Its

Offshore Supply Vessels

State Marine Corporation of Houston, Texas, has resumed the marketing and full operation of all its offshore supply vessels. Previously, most of the operations of State vessels were con- ducted by Hornbeck Offshore Services, Inc.

State's main fleet consists of large 192-foot ves- sels with bulk and 2,000-bbl liquid mud capacity as well as 141-foot clear decks. State also oper- ates smaller supply vessels in construction, diving, and cargo service.

For more information and free literature on

State Marine Corporation,

Circle 32 on Reader Service Card

Complicated RO/RO Conversions

Completed By Danyard A/S

The Danish firm of Danyard A/S, shipbuild- ers and repairers, recently redelivered to the

Mercandia Rederierne the second of two Ro/Ro ships adapted to the requirements of the Danish

State Railways' service across the Great Belt.

The two vessels, renamed Lodbrog and Kraka and bare-boat chartered from Mercandia Reder- ierne by Danish State Railways (DSB), were extensively converted by Danyard A/S to meet the exacting specifications prepared by the charterers.

In carrying out the modifications, the original main engine, a MaK 12M453AK rated at 3,600 kw (4,900 bhp) continuous, was retained but supplemented by twin Aquamaster azimuthing thrusters. An additional Brunvoll bow thruster was also fitted forward of the existing Jastram unit. Electric power is provided by three Cater- pillar 3516 diesels each driving 1,800-kva Cater- pillar generators, and additional Furuno color radars were fitted, with scanners at bow and stern.

Main dimensions of the vessels remain un- changed.

For free literature giving full details on the facilities and capabilities of Danyard A/S,

Circle 53 on Reader Service Card

B&W To Build 84,000-Dwt Products Carrier

A Norwegian consortium recently confirmed a contract for a new 84,000-dwt products carrier to be built by Burmeister & Wain's Copenhagen shipyard.

Also agreed on was an option for a second vessel, with both carriers eventually entering service with London-based Shell International on a bareboat relet.

This represents the first time that a major oil company has been directly involved with an order for one of the CPT54E tankers from its inception. The series was first introduced in 1985 and the new orders, if both are confirmed, will bring the total contracted to 13.

Norwegian shipowner Naess, Jahre & Part- ners will operate the tankers on behalf of the company Nordan III, which has taken the ves- sels on a 15-year bareboat charter from Difko.

Shell has agreed to subcharter each carrier for a five-year period with an option on a further three years.

The first vessel is scheduled to be delivered in

August 1989, with the second, if confirmed, fol- lowing some four months later.

For free literature giving complete details on the facilities and capabilities of Burmeister &

Wain,

Circle 26 on Reader Service Card

Rotary Vane Steering Systems

High performance steering for control and maneuverability when you need it most.

Wagner Rotary Vane Steering provides precise, dependable rudder control. These compact, efficient steering systems are proven performers in applications demanding high torque ratings in a small package.

The compact size, rugged design, and low inertia make the rotary vane suitable for high performance applications where fast response to steering controls is needed.

Smaller than rapson slide or cylinder-and-tiller steering systems having comparable torque ratings, the Wagner rotary vane actuator conserves space and allows the designer greater utilization of available hull and deck areas. The Wagner rotary vane typically requires only 20% of the deck area of equivalent rated cylinder-and-tiller system; and only 14% of the area of an equivalent rated rapson slide actuator.

Rotary Vane Steering

Rudder Torque Rudder Stock Size Size Weight

Model Angle' @ 1450 psi Diameter Height Width Approx (degrees) (Ibs-ft.) (inches) (inches) (inches) (pounds)

R1.6 2x35/45/60 11.570 4.53 - 5 12 10 63 15.75 430

R 2.5 2x35/45/60 18.080 5.12 - 5.91 13.39 18.90 650

R 4.0 2x35/45/60 28.930 5.91 - 6.89 15.55 19 53 1.100

R 6.3 2x35/45/60 45.470 6.89 - 7.87 17.72 22.44 1.600

R 10.0 2x35/45/60 72.330 7 87 - 9 25 20 24 25.98 2,000

R 16.0 2x35/45/60 115.700 9.25 - 10.83 24.41 30.31 3.500

R 25.0 2x35/45/60 180,800 10.83 - 12.40 27.36 35 43 5.600

R 40.0 2x35/45 289,300 12.40 - 14.57 31.50 38.19 7.400 'Rudder Angle can be selected from 2 x 35 degrees to 2 x 60 degrees.

Maneuverability is obtained from the wide range of rudder angles that are standard with the Wagner rotary vane actuator.

Rudder angles up to 2 x 60 degrees are standard; and angles up to 2 x 70 degrees are optionally available depending on model.

Wagner models R2.5 and R16 rotary vane steering gears

Wagner medium pressure rotary vane steering systems provide precise, dependable rudder response in all sea conditions

And unlike cylinder-and-tiller and rapson slide steering systems, the torque output is not dependent on rudder angle. So the full capability of the steering system is always available when needed.

Reliable and maintainable. The simple, rugged design incorporates self-lubricating rudder thrust and radial bearings, and integral rudder stops within the unit. Torque is applied symmetrically for a balanced loading of the rudder stock. And the Wagner rotary vane has external protective valving and long-life dynamic seals to minimize down-time and maintenance during servicing and operation.

Seal technology is the greatest challenge for rotary vane actuators. Through on-going research the Wagner rotary vane design has advanced seal technology to achieve low internal leakage at operating pressures of 1500 psi, allowing higher torque-to-size performance and lowering the total cost of the steering system.

The Wagner rotary vane steering system can be obtained with a wide variety of control systems appropriate to the application and customer's requirements. Control systems available include hydraulic or electric full-follow-up steering for accurate high performance systems, electric non-follow-up steering for fast maneuvering, and manual hydraulic steering for low cost applications on smaller vessels. And of course,

Wagner rotary vane steering is easily interfaced to all makes of marine autopilots and steering control systems.

Simple, rugged, compact and efficient, the Wagner rotary vane steering performs solidly in the most demanding applica- tions.

There is a Wagner rotary vane steering system for virtually every vessel.

Wagner Engineering Ltd . 40 Gostick Place

Nonh Vancouver. B.C.

Canada V7M 3G2

Telephone (604) 988-1111

Telex 04-352755

Telefax (604) 988-8809

Represented in over 60 countries — dependable since 1937 tr,mm Wanner Engineering Lid.. 40 Gostick Place :

L>l!SLl! North Vancouver. B.C.. Canada V7M 302

Please send information on Wagner's Rotary Vane Steering Systems.

Name

Title

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Phone or Telex

High performance steering for control and maneuverability when you need it most.

Circle 221 on Reader Service Card

TheCates #5 and #7 60-foot 1800 bhp twin screw berthing tugs (shown above) maintain effective control over vessels in the 30,000-40,000 deadweight ton class with Wagner rotary vane steering systems. Using the Wagner R6.3 rotary vane steering system driving 4 rudders through rudder angles up to 55 degrees at hardover-to-hardover times of 5 seconds, these Robert

Allan Ltd. designed tugs have exceptional maneuverability and a turning circle of 90 feet under full power.

November, 1988 91