MAKING FAST AT SPEED
Illustration 46
Making fast on the forward winch at low speeds
Speed lower than about 4 to 5 knots.
Illustration 47
Making fast forward winch at high speeds
Speed higher than about 4 to 5 knots.
Keep to the sheltered Lee side of the large vessel’s bow. If speed allows, keep outside unit dead slow astern.
In case of an emergency, give full power on outside unit. The tug will gain speed and turn away from the bow.
Illustration 48
Making fast on the aft winch
Keep to the sheltered lee side of the large vessels bow. If speed allows, keep inside unit dead slow ahead.
In case of an emergency, give full power on inside unit. The tug will gain speed and turn away from the bow.
Illustration 49
Making fast in rough wave conditions
Use small thruster angles for quick response to waves and keeping clear from the vessel’s transom.
Illustration 50
Switch winches
If the Fore winch breaks down, turn around and use the aft winch (if fitted).
Note : use a Fore runner.
Illustration 51
Transverse arrest
Used for stopping a vessel.
Most effective at speeds above 7 knots.
When the speed reduces, the thrusters can slowly be turned to the direct arrest mode.
See Illustration 52.
Monitor the engine speed to prevent stalling.
Illustration 52
Direct arrest
Used for stopping a vessel.
Most effective at speeds below 7 knots.
Monitor the engine speed to prevent stalling.
Illustration 53
Indirect mode
When the speed reduces, gradually move to the combination mode.
See Illustration 54
Illustration 54
Combination mode
Used for turning a vessel or keeping her on course.
Most effective at speeds below 7 knots.
Illustration 55
Clearing a thruster from ice
When a thruster is blocked or likely to be blocked by ice, disengage the thruster and reverse it. This allows the ice to float out of the thruster. The other thruster is still available for sailing/maneuvering.
When clearing the thruster by using the wash of the other thruster, the other thruster may get blocked too. (Illustration 56)
Artikel Terkait : Olah gerak Asd Tug 1
0 Komentar Untuk "Olah Gerak Asd Tug 2"
Posting Komentar