In article ,
says...

On Tuesday, February 3, 2015 at 8:26:31 PM UTC-5, David Spain wrote:

The ocean-side of this equation is very interesting...

Dave

A side note on the issue:

http://www.professionalmariner.com/M...ing-challenge/

The Falcon 9 first stage uses 39,000 US gallons of kerosene. The above
article says that tugs can have diesel fuel tanks of "up to 100,000 or
more if intended for coastwise or offshore towing".

So, perhaps Musk isn't as crazy as everyone makes him out to be when you
take into account the costs of fuel and the other costs for the tugs and
barge. With a 100,000 tank, fueling an ocean going tug isn't at all
cheap.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer