Paul,
I spent a lot of time in your neck of the woods in the early 80's while
working on the Paveway III Laser Guided Bomb. The Air Force was adamant
that we make our shipping containers have pressure relief valves (burp
valves). We took empty shipping containers (Hellfire shipping
containers) and put them in the parking lot of Eglin AFB Building 999
for a month in the summer. At the end of the month, we open the
containers up and poured the water out. Every afternoon the containers
would heat up enough to open the burp valve to equalize the pressure.
In the evening, as the container cooled, the valve would reopen and suck
in the nice cool, humid air that would condense in the container. There
was about a half an inch of water in the container after a month.
The Army lost a bunch of Hellfire missiles during Desert Storm after
shipping them on an open deck. When they got to Kuwait, they were full
of water.
I fill my tank just before haul out. There is a little fuel used to
change oil, get to the haul out well and for winterizing. I have never
had the tank overflow during storage.
Neil Schiller
1983 C&C 35-3, #028, "Grace"
Whitehall, Michigan
WLYC
On 10/25/2018 5:33 PM, Dreuge via CnC-List wrote:
I’m not in total disagreement, but the urban myth may be more of a
Great White North myth. In that, when it gets cold out it stays cold
until spring. But otherwise, when it get cold at night and warms up
in the day, it best to keep the tank either full or empty.
The reason is that a metal tank with some liquid will dehumidify the
air inside (and outside) the tank during the daytime when ambient air
starts to warm relative to the night time lows. Think about a tank
half full after a cold night. The cold fuel is a big heat sink and
will keep the tank fuel and metal container much colder than the
warming daytime air. Warming air + cold metal surface = condensation,
i.e. cold sweat. A full tank has less condensing surface and less air
inside. An empty Aluminum tank will warm and cool with ambient air so
there will be little if any condensation. I guess one could close up
the tank (i.e. close of breather line) to try to eliminate the
reoccurring condensation, but that’s likely not as easy as it sounds
(and end up being a bigger PITA than filling the tank).
With any luck, Global Warming will rid the Canadians of some urban myths….
-
Paul E.
1981 C&C Landfall 38
S/V Johanna Rose
Fort Walton Beach, FL
http://svjohannarose.blogspot.com/
On Oct 25, 2018, at 4:12 PM, [email protected]
<mailto:[email protected]> wrote:
Message: 1
Date: Thu, 25 Oct 2018 19:41:45 +0000
From: Marek Dziedzic <[email protected]
<mailto:[email protected]>>
To: "[email protected] <mailto:[email protected]>"
<[email protected] <mailto:[email protected]>>
Subject: Re: Stus-List Filling diesel tank
Message-ID:
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<mailto:byapr11mb2934ad3a98b329934abb0ae6ce...@byapr11mb2934.namprd11.prod.outlook.com>>
Content-Type: text/plain; charset="utf-8"
Consider not adding the fuel.
This is an urban myth that the condensation would add a lot of water
to the fuel. The water in the fuel tank comes usually from the
leaking fill hose cover. If you don?t believe it, do some
calculations (;-).
Depending how much you motor, if you keep topping up the tank, you
may end up with a lot of old fuel in the tank.
Many marinas don?t allow the topping up, because if you do it now,
the fuel will expand in the spring and it would leak through the vent.
of course, your boat, your choice.
Marek
Ottawa, ON
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