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Hydrogen tankers

PMN1

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I found this site on transporting hydrogen

http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/25106.pdf

On page 33 it mentions use of tankers similar to today's LNG tankers

Barges or sea-going vessels have been considered for long-distance transport of hydrogen. Canada
developed several ship designs for transatlantic transport of hydrogen. One uses five small barges
carried in a larger ship that can be separated once the trip is complete. Each barge would carry 21,200
kg (46,800 lb) of hydrogen, with no venting during a 50-day trip. Other designs included a single
tanker holding 7 million kg (16 million lb) of hydrogen and another with four spherical tanks, each
holding 3.5 million kg (8 million lb). Boil-off rates for these vessels are estimated at 0.2%-0.4%/day
(Hart 1997). None of these vessels has been constructed, but liquid natural gas tankers transport as
much as 125,000 m3 of natural gas (roughly equivalent to 9 million kg [20 million lb] of hydrogen)
(Timmerhaus and Flynn 1989).


Anyone have any guestimates on the actual size of these designs?
 

PMN1

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Found this, a 345m x 64m x 14m draft catamaran

http://www.enaa.or.jp/WE-NET/ronbun/1996/e1/ishikawa1996.html

http://www.enaa.or.jp/WE-NET/ronbun/1996/e1/ishikawa1996fig.html#z2
 

Grey Havoc

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Since this topic has become topical again (pardon the pun!), here's a design taken from the second link in the last post:
 

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