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Steel cutting on new Navy tugs

Colin Parkinson

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Steel cutting on new Navy tugs
219-034-RAmparts-2400-NLT-GA.jpg


https://twitter.com/CanadianForces/status/1309195208450609156


Some background
https://ral.ca/2019/06/25/robert-allan-ltd-to-design-new-tugs-for-the-canadian-navy/

Details of the selected NLT design include:

Length overall: 24.4 m
Beam, moulded: 11.25 m
Draft: 5.10 m
Bollard Pull: 60 T
Speed: 12 knots
Crew: 6
 

MilEME09

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Only 4? I do not know anything about port operations but that seems like a small number. How busy will these tugs be?
 

Oldgateboatdriver

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Technically, they are replacing six tugs: The five Glen class and the last remaining fire tug.

In practice, the fire tugs (when we had one on each coast) were never used in their capacity as tug boats during the week and regular working hours. They were only used as such - infrequently - outside working days/hours when the other tugs were secured alongside for the night/week-end. Since those new tugs have double capacity as fire tugs, it will simply be a matter of having one available at all times to cover the "fire" duty.

As for tug work, you can look at them as replacing five tugs with four, however, the East coast fleet is now and for the foreseeable future, smaller than it was at the end of the Cold War, with eighteen warships (12x DDH, 2X AOR, 3x SSK and Cormorant). So reducing Halifax to 2 tugs vice 3 is not going to make much difference. Moreover, with three times the bollard pull capacity they can do more work more easily.

Finally, you still have the light tugs (Ville class) to complement on both coasts.
 

Underway

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Oldgateboatdriver said:
Technically, they are replacing six tugs: The five Glen class and the last remaining fire tug.

In practice, the fire tugs (when we had one on each coast) were never used in their capacity as tug boats during the week and regular working hours. They were only used as such - infrequently - outside working days/hours when the other tugs were secured alongside for the night/week-end. Since those new tugs have double capacity as fire tugs, it will simply be a matter of having one available at all times to cover the "fire" duty.

As for tug work, you can look at them as replacing five tugs with four, however, the East coast fleet is now and for the foreseeable future, smaller than it was at the end of the Cold War, with eighteen warships (12x DDH, 2X AOR, 3x SSK and Cormorant). So reducing Halifax to 2 tugs vice 3 is not going to make much difference. Moreover, with three times the bollard pull capacity they can do more work more easily.

Finally, you still have the light tugs (Ville class) to complement on both coasts.

Agreed.  You only need four big tugs.  Three available and one on maintenance.  The smaller Ville tugs do lots of work and have no issues pushing a frigate around when in company with a big tug.  Generally there are only three tug crews available at a time anyways, barring a busy schedule. 
 

Good2Golf

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So it’s back to Kort nozzles? Are Voith-Schneider systems passé?
 

Spencer100

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So it’s back to Kort nozzles? Are Voith-Schneider systems passé?

I had to google
 

Colin Parkinson

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So it’s back to Kort nozzles? Are Voith-Schneider systems passé?
Both systems are good, more horses for courses I suspect, the tugs often have to travel and many of the Voith-Schneider systems don't by design have lot of directional stability making them a pain to take anywhere.
 

BdaDug

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Anyone know if this timeline is still on track?

The steel cutting for the first tug began in September 2020, with formal construction following in November 2020. The first two tugs are expected to be launched in April 2022 and June 2022, respectively, with first deliveries expected by the fall of 2022.
 

Dana381

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What are they doing in this video. They launch it and then bring it back on land. Are they just testing for leaks?

I'm assuming the concrete blocks are to simulate the weight of to be installed accessories. What accessories would those be?
 

Oldgateboatdriver

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You are correct that it is a float test, to see both if any water leaks in or other liquids leak out (hence, the diver - as tanks would have been filed with coloured liquids to spot leaks).

Now that they find all is fine, they take it back out and start the hull painting task.

As for the weights, they would simulate the weight of whinches, steel towing cables, cordage, shackles, anchor, anchor cables, chains, etc.
 

Dana381

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You are correct that it is a float test, to see both if any water leaks in or other liquids leak out (hence, the diver - as tanks would have been filed with coloured liquids to spot leaks).

Now that they find all is fine, they take it back out and start the hull painting task.

As for the weights, they would simulate the weight of whinches, steel towing cables, cordage, shackles, anchor, anchor cables, chains, etc.

Very interesting, thanks for the info.
 
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