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Old 16-08-2011, 12:50   #1
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Retiring a Diesel Tank

Hello,

I am planning to clean my four dieseltanks and get rid of the sludge and water. After that i will not need all four tanks for a long time and am planning to leave two tanks empty for a year or two. Is it better to fill them with water in the meantime or leave them empty?

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Old 16-08-2011, 12:54   #2
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Re: Retiring a diesel tank

Leave them empty. Filling with water for a year or two without using it will just hasten any corrosion.
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Old 16-08-2011, 14:01   #3
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Re: Retiring a diesel tank

Empty. The weight makes the boat less efficient.
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Old 16-08-2011, 14:14   #4
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Re: Retiring a diesel tank

Okay thanks. I was thinking about using the keel tanks and leaving the higher located wing tanks empty.
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Old 19-08-2011, 01:22   #5
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Re: Retiring a Diesel Tank

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Is it better to fill them with water in the meantime or leave them empty?
Why not leave them with a bit of diesel plus a shock dose of biocide?
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Old 19-08-2011, 01:31   #6
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Re: Retiring a Diesel Tank

A bit of diesel will encourage condesation.

However, the biocide dose for the last couple of litres will ensure that the fuel lines remain good. The stuff I use is called "Fuel Set" and this is also a water emulsifier. It is proven to clear the fuel - I have just demonstrated this on my own tanks (long story)
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Old 19-08-2011, 03:27   #7
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Re: Retiring a Diesel Tank

Seal all openings and fill with CO2 from an extinguisher. Works with black iron tanks.
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Old 19-08-2011, 05:15   #8
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Re: Retiring a Diesel Tank

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Seal all openings and fill with CO2 from an extinguisher. Works with black iron tanks.
Or Nitrogen, if you can get it.
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Old 19-08-2011, 05:47   #9
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Re: Retiring a Diesel Tank

Is that to take away the oxygen?
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Old 19-08-2011, 05:49   #10
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Re: Retiring a Diesel Tank

Yes, then seal around the outside of the tank with heavy duty vapor barrier and fill that with nitrogen, after you have carefully dried the inside of the boat to ensure no possible chance of water vapor getting to the tank.
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Old 19-08-2011, 06:22   #11
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Re: Retiring a Diesel Tank

Thought the OP was concerned about condensation forming in the tank.
CO2 and Nitrogen would be drying agent to displace ambient atmosphere.
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Old 19-08-2011, 06:33   #12
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Re: Retiring a Diesel Tank

Heh, I didn't even notice it was an aluminum boat.
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Old 19-08-2011, 10:11   #13
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Re: Retiring a Diesel Tank

The tanks are built in by the way, with massive capacity. Hence the retirement of two or three of them.
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