"Joe" wrote in news:1139086273.436449.238910
@o13g2000cwo.googlegroups.com:

Nothing worse than maintaining a double hull, sweats, and impossiable
angles to needle gun. We use to suitup in coveralls, go in the voids
with a wash down gun and spray the voids with pure fish oil. What a fun
summer job.

Joe


Double hulls you would talk about for tankers would be coated. The biggest
problem was keeping down the mud buildup as this cost you cargo.

Well yeah... But how long do you think that coating is going to last
15-20 yrs maybe, more like 10 if an excellent job was done in the first
place. The supply boats were coated when new.

Joe

"Joe" wrote in news:1139101562.623510.275140
@g47g2000cwa.googlegroups.com:

Well yeah... But how long do you think that coating is going to last
15-20 yrs maybe, more like 10 if an excellent job was done in the first
place. The supply boats were coated when new.

Joe



Initially, many of these tanks were coated with inorganic zinc .....
mistake, as electrolysis tended to be a problem.
Now tend to be coated with various newer vinyl coatings.
Generally these are well monitored and re-done as needed during yard
periods (blasting)..... cheaper than replacing steel.

otn

How much space is between the 2 hulls?

SV


"otnmbrd" wrote in message
25.201...
"Joe" wrote in
news:1139101562.623510.275140
@g47g2000cwa.googlegroups.com:

Well yeah... But how long do you think that coating is going
to last
15-20 yrs maybe, more like 10 if an excellent job was done in
the first
place. The supply boats were coated when new.

Joe



Initially, many of these tanks were coated with inorganic zinc
......
mistake, as electrolysis tended to be a problem.
Now tend to be coated with various newer vinyl coatings.
Generally these are well monitored and re-done as needed during
yard
periods (blasting)..... cheaper than replacing steel.

otn

"Scotty" wrote in news:43e6069f$0$25070$cd3e3bf6
@news.enter.net:

How much space is between the 2 hulls?

SV


The one I'm most familiar with is a relatively small 50,000 Dwt, double
bottom (not dbl hull) tanker.
The dbl bottom tanks had @8' of headroom, i.e. they were walk around,
though there was a good deal of framing which frequently required climbing
through limberholes to move through sections.
Generally, these tanks are used for ballast, so they are quite large and
there size will depend on the size of the ship.

otn