Assessment: Types of Tugs

13 Aprile 2022

|By Maurizio Garipoli

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Domanda 1 of 15

1. Domanda
Where is the towing hook typically positioned in a conventional tug?
- The towing hook is typically positioned at a distance of 0.45 x LOA from the bow
- The towing hook is typically positioned at a distance of 0.45 x LOA from the stern
- The towing hook is typically positioned at a distance of 0.25 x LOA from the stern
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Domanda 2 of 15

2. Domanda
To make fast a tug forward is a safe operation?
- There is no problem securing the conventional tug forward
- Yes, it is safe to secure the conventional tug forward, but only in good weather condition
- Although it can operate efficiently, the conventional tug suffers the effects of the turbulence caused by the wake of its propellers that collides with the water displaced from the ship's bow, making it challenging to maintain directionality during the approaching phase.
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Domanda 3 of 15

3. Domanda
What about the agility of traditional tugs?
- The shape of the hull and the type of propulsion make the traditional tug not very agile
- The shape of the hull and the type of propulsion make the traditional tug very agile
- Traditional tugs behave like all others
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Domanda 4 of 15

4. Domanda
How are ASD tugs equipped?
- The ASDs are fitted with two aft azimuth thrusters that operated together or separately and rotated 360°
- The ASDs are equipped with two forward azimuth thrusters that operated together or separately and rotated 360°
- The ASDs are equipped with two central azimuth thrusters that operated together or separately and rotated 360°
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5. Domanda
How many towing points can ASD tugs have?
- They can have only one towing hook positioned in the bow
- They can have only one towing hook positioned in the stern
- They can have two towing points, one positioned in the bow and one in the middle, or be equipped with only the bow towing point
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Domanda 6 of 15

6. Domanda
What is it called if the ASD tug is equipped with only the bow towing hook?
- In this case, they are known as "Voith Schneider" and always work with the stern facing the ship
- In this case, they are known as "reverse tractor tugs" and always work with the bow facing the ship
- In this case, they are known as "conventional tugs" and always work with the bow facing the ship
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Domanda 7 of 15

7. Domanda
What advantages do ASD tugs have over ATDs?
- The hull's shape and the aft propulsion allow better direction control at high speeds and better towing performance in the open sea
- Their bollard pull is greater than ATDs, and they have a lower draft
- Both of the above answers are correct
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Domanda 8 of 15

8. Domanda
What about the sideway effectiveness of the ASD tugs?
- The sideway effectiveness of the ASD tugs is very low
- The lateral effectiveness of the ASD tugs is great
- N.A.
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Domanda 9 of 15

9. Domanda
Where is the propulsion system located in the VTDs?
- In VTD tugs the propulsion system is located aft
- In VTD tugs the propulsion system is located forward of the centre
- In VTD tugs the propulsion system is located extremely forward
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Domanda 10 of 15

10. Domanda
What is the manoeuvrability of a Voith Schneider?
- Standard manoeuvrability
- Poor manoeuvrability
- Excellent manoeuvrability
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Domanda 11 of 15

11. Domanda
What is the difference between a VTD and an ATD?
- If we install two azimuth thrusters instead of the cycloids, we have an Azimuth tractor drive tug
- There are no differences
- The first has inward propellers, while in the second, they are outward
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Domanda 12 of 15

12. Domanda
Is more powerful ASD or VTD?
- They have the same power
- The VTD is more powerful
- The ASD is more powerful
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Domanda 13 of 15

13. Domanda
How is the risk of capsizing in ATD?
- The risk of capsizing is not so high
- The risk of capsizing is very high
- The risk of capsizing is the same as for in conventional tugs
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Domanda 14 of 15

14. Domanda
Are the ATD suitable tugs for manoeuvres in confined spaces?
- Absolutely not
- It is not the best choice
- The tractor tugs are the most suitable tugs for manoeuvres in confined spaces
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Domanda 15 of 15

15. Domanda
What are the weaknesses of ATDs?
- They have a lower Bollard Pull than the ASDs
- when towing in the open sea, having the pivot point close to the position of the thrusters, they have difficulty maintaining a stable course
- Both of the above answers are correct
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Assessment: Types of Tugs

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