Cd.17 Steering Gear
Which one these three rudders gives the best maneuverability, given they have the same size?
flap rudder
The water flow creates…?
both vertical and side forces
What are the parameters most essential for the rudder torque?
rudder arrangement, size of the rudder and the vessel's speed
What is the purpose of the safety valve?
to protect the actuator against too high oil pressure
How is the movement of the actuator created?
start at least one power unit and actuate the direction valve
What is the limit in size for tankers to use only one standard steering gear?
100 000 dwt
When shall both power units be in use?
when navigation demand special caution
One of the statements below is not correct, which one?
The ram type steering gears generally work with a lower oil pressure than a rotary vane
What is the main purpose of the housing, stoppers and cover?
making boundaries for the pressure chambers
What are the bearings made of?
brass
What are the bearings lubricated with?
the system oil
How is the rotor fixed to the rudderstock?
by friction only
In case of any steering gear alarm occurs this can only be acknowledged from..?
the wheel house
Where is the remote rudder angle indicators most often located?
at the bridge
The steering mode, in which the rudder angle is pre-set manually and kept in position automatically, is called?
follow up
According to the SOLAS rules the maximum rudder angle to Port and Starboard should be at least:
35 deg
According to the SOLAS rules the rudder angle velocity should be at least 35-0-30 degrees in maximum 28 seconds for:
Regular ships, other requirements for special ships.
The steering gear's maximum working torque is:
at least the torque necessary to turn the rudder to the maximum required angle at he vessel's full speed, according to the class rules
When is the steering gear ready for turning the rudder controlled from the wheel house?
steering controlled ready WH and run on at least one of the power units
What is the purpose of the acknowledge function:
tell the system that the alarm is registered
Case: one power unit is running and the other in stand by. “Overload” alarm occurs on the running power unit. What will happen?
the stand by power unit will start automatically, and the one with the alarm stops
The vessel is offshore on steady course and an order to switch over to local steering is given. What knowledge will you need in particular?
What you have learnt from the operating instructions and drilling the emergency procedures.
Which types of valves are actuated in case of local steering?
direction valves
Which one of the situations described below may cause the need for local steering?
bridge out of function
Heavy jobs on the steering gear should be done by:
a service engineer from the steering gear manufacturer
The actuator bearing should be checked
every 5 years, or after grounding
Which of the parts mentioned below are normally not exposed to wear or ageing?
cast iron sealing bars
Which of the factors do you believe will not affect the lifetime of brass bearings in the actuator?
safety valve pressure
Which of the statements below belongs to Porgrunn's spare parts policy?
essential spare parts are to be kept on stock