Q6. With reference to electro-hydraulic steering gears:
A. Explain in terms of control parlance, the function of the “Hunting gear”;
B. Explain the consequences if the standby pumping unit is motored;
C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.
Q4. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down;
B. State how the vanes described in (A) are secured and the method of sealing the edges;
C. State how, if necessary, the steering gear is locked for rudder maintenance.
Q8. With respect to hydraulic Ram steering gears;
A. What emergency locking device can be used in order to speedily bring the steering gear to rest? State one reason the best angular position to lock the steering gear.
B. Use a simple sketch to show where the “Jumping” (top) and wear down (bottom) rudder carrier ring clearances can be measured. Indicate what clearances you would expect with a new steering gear;
C. State the consequences of the wear down clearances being reduced to less than Zero.
Q1: A. Outline the procedure for the inspection of the rudder in a dry dock.
B. What are the requirement with respect to steeling gear as per SOLAS 74, as amended for the following:
i. Relief valve;
ii. Steering gear control;
iii. Electrical power circuits.
Q4. With reference to steering gear hydraulic systems:
A. Explain the factors that could contribute to failure of connecting flange leading to total loss of oil from the system.
B. Describe an arrangement designed to ensure that the problem would not cause steering failure.
Q8. In a Rotary vane steering gear, briefly state.
a) How are the fixed and moving vanes attached to cylinder and rotor respectively.
b) How many sets of vanes are provided? What is the limitation factor to number of vanes.
c) How is strength imparted to moving vanes to enable them to act as rudder stops?
d) How is rudder uplift accommodated?
Q7. The steering gear operation of a vessel that recently experienced a heavy storm is found to be abnormally sluggish.
a) State the reasons for possible malfunction of the gear.
b) State the corrective actions that may be carried out at sea, that will allow the vessel to continue to the nearest port.
Q6. Steering system failure has caused shipping casualties and oil pollution. Discuss
a) The causes of such failure (8)
b) The precaution necessary in design, operation, and maintenance of these systems. (6)
c) Requirements on tankers, which was made mandatory after the shipping casualty. (6)