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Q7.a) Sketch and describe hydraulic circuit of steering gear incorporating automatic isolation system. (8)

b) Explain ‘Emergency steering’ (4)

c) Describe the routine tests of steering gear as per SOLAS requirement. (4)

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. (a) Describe the regular maintenance routine of the steering gear of a ship. (8)

(b) Describe with suitable diagram, how steering pump filters are cleaned. (8)

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)

Q6: With reference to electro-hydraulic steering gears:

A. Sketch and describe a steering gear with two 50% torque units conforming to the single failure criteria. (8)

B. State, with reasons, the precautions necessary when operating on two rams only; (4)

C. Describe the tests necessary to ascertain that the gear will operate as required when one side of the circuit develops a malfunction. (4)

Q8.a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions. (8)

b) State the purpose of, and describe the operation of (8)

i) hydraulic shock/buffer valves.

ii) Oil replenishing tank.

iii) Hunting gear.

Q7. (a) Sketch in simple form a constant speed hele-shaw pump suitable for a hydraulic

steering gear. (6)

(b) Describe the pump and its principle of operation. (5)

(c) What characteristics of the pump make it suitable for use in steering gear system? (5)

Q4. With reference to electrohydraulic steering gear systems with four Rams,

(a) With the aid of a sketch describe the working principle of hydraulic pump. (8)

(b) Explain the method adopted to prevent hydraulic oil leakage along the rams (4)

(c) Discuss the methods adopted to prevent damage to the steering gear due to jumping of rudder in heavy seas. (4)