A recent article from Baird Maritime reminded me once again, of a type of vessel I think the Coast Guard should seriously consider, a replacement for the 65 foot icebreaking tugs. Reportedly the Coast Guard hoped to decommission the 65 foot tugs, but Congress would not allow it. Their breaking ice dams for flood prevention and domestic icebreaking was considered too important.
This particular design seems to offer some additional advantages I have not seen in previous designs. Designed to operate in the Baltic in ice up to 0.8 meters thick (that is 0.3 meters more than the 140 WTGBs), it is substantially larger than the 65 footers at 31.5 meters or about 103 feet. The report indicates seaworthiness was a major consideration.
The Congressional contingent from the Great Lakes area have repeatedly expressed concerns about Great Lakes Icebreaking (and here). They want another icebreaker comparable to the Mackinaw, but a few more icebreaking tugs might actually be a better response.
In addition to icebreaking, these could provide a ready response to pollution incidents (this one can transport a standard 20 foot container). Given fire monitors these vessels could function as fireboats.
Of course this tug isn’t the only option, nor is it the only icebreaking tug design out there. I had intended to talk about this earlier, so I have some old news to reference.
When you look at these options keep in mind what we have now.
- The nine 140 foot WTGBs entered service August 1979 to August 1988 so they are 33 to almost 43 years old and have only 2500 HP, speed 14.7 knots. We have done life extension work on them, but maybe its time to look for their replacements too.
- The eleven 65 foot WYTLs entered service July 1961 to May 1967 so they are 55 to almost 61 years old and have only 400 to 475 HP, speed 10 knots.
In addition to the tug above, Robert Allen has designed a number of tugs including an icebreaking/buoy tending tug built in the US for the Saint Lawrence Seaway. Check out this Marine Log report.
Gulf Island Fabrication to Build TundRA 3600 for Saint Lawrence Seaway Development Corporation
MarineLink reported that MedMarine (a Turkish shipbuilder) is building some icebreaking tugs for Danish company, Svitzer. (They also have an office in Florida.) The design designated “TundRA 3000″ is by Canadian designer Robert Allan Ltd.
TundRA 3000 design has following design particulars:
- Length overall: 30m
- Beam of hull: 12.6m
- Extreme beam (including fenders): 13.2m
- Depth moulded: 5.7m
- Maximum draft: 5.6m
- Gross tonnage: <500GT
- Minimum bollard pull: 60ton
- Power: Approx 3900 kW (5300 HP)
At the small end we have this 56 foot long icebreaking tug with 750 HP, almost twice that of our 65 foot tugs.
My point is not that any particular design is the answer, but that there are much better and more effective designs out there compared to vessels we are currently using. Crew size and operating costs are likely to the same or perhaps less. There is new technology that is more economical, offers better maneuverability, and lower emissions. Additionally they could be more generally useful than the tugs we have. They might have buoy tending capabilities, fire fighting monitors, or provide ready oil pollution incidence response.
The company that ordered Selene and Helios operates a fairly large fleet of ice class tugs ranging from older vessels to modern ASD tugs as well as a few slightly bigger anchor-handlers used for icebreaking during the winter months:
I heard Selene and Helios were tailored based on operator experience and that they have been pretty happy with the result.
Two of their tugs (Calypso and Protector) are also used to push those detachable icebreaking bows (the older one is just a “dumb barge”; the newer one has diesel generators and additional propulsion) that have been in the news recently.
Thanks, meant to mention the detachable icebreaking bow in this post.
The RCN is acquiring some new tugboats, also designed by Robert Allan… https://ral.ca/2019/06/25/robert-allan-ltd-to-design-new-tugs-for-the-canadian-navy/
Crew of 6, 24 metres long.
Thanks that is a very complete report on those 80 foot tugs.
The real trick will be to get the congressional persons to approve using a foreign design, I am assuming US boatyard construction
A WYTL replacement icebreaking tug is a good fit for hybrid type propulsion. Either a diesel/battery or ship’s service generator that can power an electric prop motor. A big problem with the 140 WTGB is that nobody wants to operate on only one engine during the spring-fall when you don’t need full power for breaking. We all know that lightly loading big diesels is hard on the engine and terrible for emissions. Of course this adds greatly to both cost and complexity. A 5000hp tug as described above is about $15 million on the commercial market, add another 50%-100% for any type of “exotic” propulsion system. That $15 million may not sound large to DOD but it is pretty much a deal breaker for a platform that gets as little use as a a WYTL. The true need for the WYTL is probably 2-4 units in the New England coast and even then only for a few weeks a year.
Yes it the tugs can be made useful for other things such as pollution response or firefighting, it makes their acquisition more attractive.
Really $20M per unit is not that much even in the CG budget, less than a third the cost of an FRC and they will probably last 50 years.