by Jbren1 » January 8, 2014, 6:32 pm
Lakes-only ships are much weaker, in terms of main hull girder strength, than oceangoing ships. The key is that waves on the lakes are shorter (distance horizontally between peak and trough) than ocean waves, even though the lakes can be quite rough.
I think it's correct that big ATB bulker/self unloaders are not likely to ever be seen on the Canadian side, given two main facts:
-the Canadian ships often traverse the Welland Canal/Seaway where the length of the tug extending aft of the barge would directly subtract from the maximum possible length and therefore carrying capacity of the barge, unless the tug constantly moves in and out of the notch which isn't practical either.
-as seen in the new Algoma and CSL ships, Canadian operators are allowed to build their ships in China at a fraction what it would cost in Canada, and even back when the Canadians built their own lakers they were still generally cheaper than those built in the US.
But US ships rarely use the Welland/Seaway is rare, and no old steam lakers would exceed the length of the Poe Lock if cut down to barges, even if the tug increased their length. And all US operators are subject to sky high US shipyard costs (please note that's not blaming anyone, it's just a fact: it costs 3 or 4 times as much to build or do a major conversion on a merchant ship in the US as Far East). Therefore continued conversion of old US steam lakers to barges in ATB is quite likely IMO. In fact you might have seen a flurry of such activity already if the steam lakers hadn't gotten a special exemption from new EPA emissions rules. Although, some old steam lakers have also been repowered with diesels and that's possible as well. Likewise there's no great economic penalty to building a new Seaway max length barge on the Gulf Coast like Great Lakers Trader, since the Rube Goldberg process of getting it through the Seaway is only done once. Or you can just build a new large barge of that size on the lakes, like Lakes Contender. It seems barges of that size are economically viable for the US trades, but you could even build bigger ones up to the size of Presque Isle, almost the capacity of a true 1000 footer.
I think it's unlikely we'll see all new full ship lakers built on the US side again unless the US were to change the Jones Act to allow the US Lake Carriers to build in the Far East like CSL and Algoma can. If that change isn't made, and there's no sign it will be, then I think we'll see more or less barge conversions of older steamships and/or new barges depending how fast or if the overall US traffic levels increase.
Just my two cents based mainly on being an interested observer of the lakes ships from outside the industry, though long ago I was a naval architect and did some design and consulting work for lakes operators as a junior person.
Joe
Lakes-only ships are much weaker, in terms of main hull girder strength, than oceangoing ships. The key is that waves on the lakes are shorter (distance horizontally between peak and trough) than ocean waves, even though the lakes can be quite rough.
I think it's correct that big ATB bulker/self unloaders are not likely to ever be seen on the Canadian side, given two main facts:
-the Canadian ships often traverse the Welland Canal/Seaway where the length of the tug extending aft of the barge would directly subtract from the maximum possible length and therefore carrying capacity of the barge, unless the tug constantly moves in and out of the notch which isn't practical either.
-as seen in the new Algoma and CSL ships, Canadian operators are allowed to build their ships in China at a fraction what it would cost in Canada, and even back when the Canadians built their own lakers they were still generally cheaper than those built in the US.
But US ships rarely use the Welland/Seaway is rare, and no old steam lakers would exceed the length of the Poe Lock if cut down to barges, even if the tug increased their length. And all US operators are subject to sky high US shipyard costs (please note that's not blaming anyone, it's just a fact: it costs 3 or 4 times as much to build or do a major conversion on a merchant ship in the US as Far East). Therefore continued conversion of old US steam lakers to barges in ATB is quite likely IMO. In fact you might have seen a flurry of such activity already if the steam lakers hadn't gotten a special exemption from new EPA emissions rules. Although, some old steam lakers have also been repowered with diesels and that's possible as well. Likewise there's no great economic penalty to building a new Seaway max length barge on the Gulf Coast like Great Lakers Trader, since the Rube Goldberg process of getting it through the Seaway is only done once. Or you can just build a new large barge of that size on the lakes, like Lakes Contender. It seems barges of that size are economically viable for the US trades, but you could even build bigger ones up to the size of Presque Isle, almost the capacity of a true 1000 footer.
I think it's unlikely we'll see all new full ship lakers built on the US side again unless the US were to change the Jones Act to allow the US Lake Carriers to build in the Far East like CSL and Algoma can. If that change isn't made, and there's no sign it will be, then I think we'll see more or less barge conversions of older steamships and/or new barges depending how fast or if the overall US traffic levels increase.
Just my two cents based mainly on being an interested observer of the lakes ships from outside the industry, though long ago I was a naval architect and did some design and consulting work for lakes operators as a junior person.
Joe