Steering Gear

Unless the main steering gear comprises two or more identical power units, every ship is to be provided with a main steering gear and an auxiliary steering gear. The main steering gear is to be capable of putting the rudder over from 35° on one side to 35° on the other side with the ship at its deepest draft and running ahead at maximum service speed, and under the same conditions from 35° on either side to 30° on the other side in not more than 28 seconds. It is to be power operated where necessary to meet the above conditions and where the stock diameter exceeds 120 mm. The auxiliary steering gear is to be capable of putting the rudder over 15° on one side to 15° on the other side in not more than 60 seconds with the ship at its deepest draft and running ahead at half the maximum service speed or 7 knots whichever is greater. Power operated auxiliary steering gear is required if necessary to meet the forgoing requirement or where the rudder stock diameter exceeds 230 mm.

The main steering gear for oil tankers, chemical tankers or gas carriers of 10000 gross tonnage or more and every other ship of 70000 gross tonnage or more is to consist of two or more identical power units which are capable of operating the rudder as indicated for the main steering gear above and whilst operating with all power units. If a passenger ship, this requirement is to be met when any one of the power units is inoperable.

Steering gear control for power operated main and auxiliary steering gears is from the bridge and steering gear compartment, the auxiliary

(a) SEPARATE CARRIER AND STUFFING BOX

(A) DUNSTOS IMPROVED RUDDER CARRIER

(B) COMBINED RUDDER BEARING AND STUFFING BOX

Grease pipe /q Grease nipple u

(b) COMBINED RUDDER CARRIER AND STUFFING BOX

STUFFING BOX

Forged collar

(A) DUNSTOS IMPROVED RUDDER CARRIER

(B) COMBINED RUDDER BEARING AND STUFFING BOX

STUFFING BOX

Rudder Carrier Bearing

Forged collar

Figure 21.5 Rudder bearings

Figure 21.5 Rudder bearings steering gear control being independent of the main steering gear control (but not duplication of the wheel or steering lever). Steering gear on ocean-going ships is generally of the electro-hydraulic type.

Where the rudder stock is greater than 230 mm an alternative power supply is to be provided automatically from the ship's emergency power supply or from an independent source of power located in the steering gear compartment.

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Responses

  • elizabeth
    What is trunnion in rudder carrier bearing?
    3 years ago
  • robel
    Why ship's rudder stock dia greater than 230?
    2 years ago

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