Offshore patrol vessel Vigilant sea-trials - with fully independent steering of twin rudders with steel hydraulic steering gear

Sea trials of off shore patrol/naval vessel with fully independent control of twin steering gears

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Mauritius - coast guard vessel "Vigilant" undergoing sea trials

Jastram Engineering Ltd. provided the steering system, including steering gear, rudder stock, upper rudderstock bearings, and rudder trunk casings.

This electronic control system offers precise accurate and fully independent control of twin steering gears, with no requirement for mechanical linkage between the port and starboard rudders. Each rudder, or set of rudders, is electronically controlled by a Jastram full follow-up amplifier system. Rudders can be selected to operate in either fully synchronized mode (for traditional rudder operation) or independent mode (for modified maneuvering characteristics) or dynamic braking.

The system exceeds world wide classification requirement of single failure criteria for steering systems. Should a failure occur on one side, the redundancy feature permits the vessel to be safely controlled by the opposite steering system. [ Cited in Harbour & Shipping, Nov. 1996, pp. 31, Van. B.C.]
Vigilant offshore patrol vessel with full independent steering control of twin steerin gears undergoing sea-trials

The Vigilant is the first vessel built using the "Guardian Class" Offshore Patrol Vessel (OPV) design developed by Polar Design Associates Ltd. (Naval Architects & Marine Engineers). OPV

... The vessel is classed by the American Bureau of Shipping as ABS+A1E+AMS, and meets or exceeds US Navy criteria, including the Ocean Service 1(a) requirement that it be able to weather the full force of tropical cyclones, this being, for design purposes to comprise a minimum assumed wind speed of 100 knots on the beam

(this design).... is economical to construct, maintain and operate yet provides a high degree of utility, safety and crew comfort on long patrols.

The vessel was built in Chile at the Talcahuano Shipyard of ASMAR - Shipbuilding and Docking Company, under the supervision of a Western Canada Marine Group (WCMG) project team. [ Cited in Harbour & Shipping, Nov. 1996, pp. 30 - 34, Van. B.C.]

Aft view - coast guard / OPV Polar Class vessel with independent steering systems

- back to Part One of Vigilant

Jastram Engineering Ltd

135 Riverside Drive,
North Vancouver,
British Columbia,
Canada V7H 1T6

TEL: 1-888-JASTRAM
Tel: 604-986-0714
WEBSITE: www.jastram.com

Jastram designs and manufactures, a whole line of marine steering gears and steering controls, including ram type gears (Model B and Model S) and rapson slide gears (Model K). A complete range of steering controls including electric helm, full follow-up levers, jog levers, rudder angle indicators and various steering control amplifiers, ensure that Jastram can offer complete system responsibility for any steering application.

REFERENCE NOTES - REFERENCE NOTES

Approvals

Jastram steering gear components are designed and manufactured in Canada according to all major classification society rules including: ABS (American Bureau of Shipping), CE, LLOYDS, GL, DNV, BV, NKK, KRS, USCG (U.S. Coast Guard), CCG, CR, and ZC.

Jastram Press Release - ABS Type Approval

Jastram Engineering Ltd. (JEL) is pleased to announce they have received ABS Type Approval status for their Model S hydraulic cylinders. These cylinders are specifically designed for commercial marine hydraulic steering service under the ABS Type Approval Program.

This ABS Type Approval certifies that the design of the Model S cylinders is in accordance with the ABS rules and requirements, and the quality of the products is in consistent compliance with the ABS manufacturing standards.

> The Jastram Model S cylinders are most frequently installed on commercial work boats, supply vessels, large passenger vessels, megayachts, tankers, and icebreakers. They can be used in either new steering gear system installations or in retrofit and repair programs. Jastram also offers custom design and engineering support to customers upgrading their existing steering systems to meet the current marine safety standards.

Jastram Model S hydraulic cylinders and steering systems are designed and manufactured to meet the standards of world's major classification societies including CCG, CE, LRS, USCG, GL, DNV, BV, CR, ZC (CSS), CCG, KR as well as ABS.

For complete information, please contact Jastram Engineering Ltd.

Jastram Engineering Ltd. is part of the ABS (American Bureau of Shipping) Equipment Type Approval Program. Certificate No: 97-VA13003-X.

Equipment - Hydraulic Cylinders	Brass Models : B-150, B-200, B-300 Steel Models : S-300, S-400, S-500, S-800
Intended Service:	Commercial Steering Gear
Description:	Hydraulic Cylinders for Steering Gear Application

Please Note after August 2004

The above web page is part of Jastram's Web Archives 1996-2004.

Jastram's most current information can be accessed from the redesigned web site through the links below: