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Active Contributor

Join Date: Oct 2009
Location: Maine, USA
Posts: 20

What to Do With Old #2 Fuel Oil?

10/19/2009 11:09 PM

I have a house in Maine, USA, that I'm renovating to be a rental property. It's been closed up, drained etc. for nearly 10 years. As I near completion of the renovation I need to understand what I should do with the oil that's left in the tank. There's about 60 gallons in it and it's just been sitting for all this time. Before I start the furnace, should I just filter the oil a few times, or should I completely drain the tank and put fresh oil in?

Thanks for your replies.

Tom

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#1

Re: What to do with old #2 fuel oil?

10/20/2009 3:04 AM

Tom,

I've got a few questions, and a few comments, bot not necessarily an answer for you.

First the questions:

You say "There's about 60 gallons in it and it's just been sitting..." -

Is your 60 gallon estimate based on a direct gauge (or a remote petrometer) reading, a dipstick, or something else?

Where is the storage tank located? what is it's total capacity? Age?

Is this in a typical "oblong" 275-gallon (or bigger) above ground tank (AST) located in the basement? (Or outside??)

Or is it an underground tank, located somewhere in the yard?

===============================================

Now the comments:

IMO, you have at least one, and possibly two "problems" to contend with - Water and Air.

Or more specifically, condensed water sitting at the bottom of the tank, and at least some badly oxidized fuel at the top.

Presumably, with only 60 gallons, regardless of its location, your tank is more than 2/3 empty. But the "empty" space that isn't filled with fuel, is filled with air. And remember that it isn't a closed system, a "fresh" supply of air is available via the tank's vent pipe.

Don't underestimate the amount of expansion & contraction that the air in the tank can undergo due to ambient temperature fluctuations. This causes the tank to "breathe" through the vent pipe, in a manner of speaking. (And we're talking about temperature fluctuations in MAINE!)

So the moisture ("humidity") present in that air inside the tank will condense into liquid water, and, being denser than diesel, it collects at the bottom of the tank. Over time, enough condensed water has been known to rust out the bottom of tanks that have seen long service.

This moisture collection would be even more of a problem if your tank were outdoors/underground, where it would be subject to more extreme temperature changes (and probably higher ambient humidity) than a tank in the basement. But you are in MAINE!

Of course water at the bottom of the tank wouldn't be an issue if you were located in the middle of the desert, where there is little moisture in the air. (But then if that were the case, you probably wouldn't be worrying about burning 10 year old diesel in the furnace!) But you are in MAINE!

And the oxygen in the air does its work on the topmost fuel over time, causing formation of fine particulate matter which may be hard to thoroughly filter out, but will surely clump up and foul your equipment if you don't.

Over a ten year period (IN MAINE), these two factors have undoubtedly adversely affected at least some of the 60 gallons of remaining fuel.

======================================================

Wrapping it all up, at a minimum, forget about using the bottom few inches of the tank's contents, as it will consist mostly of settled "gunk", scale, rust, and water. And the top several inches are probably loaded with oxidized petroleum compounds and particulate matter.

So, you likely do have SOME usable fuel in the "middle" of the tank. You could try siphoning of all but the bottom 3 or 4 inches of fuel, discard the bottom "gunk" and filter the remainder through a < 5 micron filter, and see if that works.

But is it worth the risk?

I can't say, but you should consider how much would it cost you to get the furnace burner cleaned/overhauled vs. the saving of 30-40 gallons of diesel.

==============================================================

Either way, once it is empty, I would strongly advise that you take a close look at the bottom of the tank, maybe even TAP it lightly with a hammer, to find signs of rust, deterioration, or imminent failure...

Good Luck!

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Active Contributor

Join Date: Oct 2009
Location: Maine, USA
Posts: 20
#2
In reply to #1

Re: What to do with old #2 fuel oil?

10/20/2009 8:16 AM

Ah yes...life in Maine!

Thanks for the great description of the problems in MAINE...I pretty much figured that the oil might be a loss but I'm still not sure about the tank. Yes it's the typical 275 gal, indoor tank, with a gauge on the top. The tank is about 14years old...installed in 1995 I believe. The gauge reads a little over 1/4 full so I estimated 60 gals. based on that.

I will drain the entire tank and inspect the oil that comes out for information purposes...maybe it can be used for some other project like a waste oil furnace. Then I'll do as you suggest and thoroughly inspect the tank, decide on the condition, and either replace it or clean/flush and use it. I'll probably get a small tank (55gal drum) to use initially so I can fire up the furnace with some clean oil and maybe get some heat in the house while I finish painting this winter...in MAINE!

Sound like a plan?

Tom

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#3
In reply to #2

Re: What to do with old #2 fuel oil?

10/20/2009 11:45 AM

Tom,

That sounds like a good plan. If the tank is only 14 years old, you probably have much less to worry about regarding corrosion, but a good inspection now could save you headaches down the road. I was imagining a 30, 40 or 50 year old tank.

BTW, don't take me wrong, I grew up taking camping vacations annually with my family, and some great memories from my youth were in MAINE!

Now, if there were only some way to harness the energy of Simulium venustum and Simulium vittatum (i.e., the black fly)...

Active Contributor

Join Date: Oct 2009
Location: Maine, USA
Posts: 20
#4
In reply to #3

Re: What to do with old #2 fuel oil?

10/20/2009 12:39 PM

Thanks again, I feel better about the condition of the tank now. I did a quick inspection this morning and it really doesn't look bad, but we'll see what the inside looks like after it's empty.

I'm going to get a few extra filters and pump the oil through them as I empty it, that way I have a better chance of recovering it for another use.

We have lots and lots of Culiseta logiareolata that I wish I could harness or eat! Some of us still think of it as the State Bird!

"Maine, the way life should be."

Tom

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#5

Re: What to Do With Old #2 Fuel Oil?

10/21/2009 3:58 AM

If the tank were in the basement it could be just fine because the temperature doesn't fluctuate much, the basement likely doesn't go above 65°F this would severely limit biological growth in the fuel.

Check if there is water bleed off valve or just crack open the plug a the bottom of the filter. Normally adding some redline does the trick for many faulty fuel situations.

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Location: Maine, USA
Posts: 20
#6
In reply to #5

Re: What to Do With Old #2 Fuel Oil?

10/21/2009 7:40 AM

Thanks bwire,

In this case, even though the tank is in the basement, since there has been NO heat in the house since 2001, it fluctuated...probably between -20 and 65. Maybe 70 or 80deg once in a while but nothing extended, like weeks or months. There was a minor flood problem in this basement at one point and I had to remove a lot of mold on the floor and walls in the basement. That's one of the reasons it being renovated...I had to remove all the false floors in the basement, the wallboard, insulation etc. The upper living quarters just needed cleaning and removal of rugs. I'll be doing further checking as you suggest.

Thanks again.

Tom

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#7
In reply to #6

Re: What to Do With Old #2 Fuel Oil?

10/21/2009 10:07 AM

In the future, once you're running new oil, here is a helpful maintenance item for removing small amounts of water collecting at the bottom of the tank.

http://www.h2ocontrol.com/productsWaterWorm.php

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#9
In reply to #6

Re: What to Do With Old #2 Fuel Oil?

10/21/2009 12:47 PM

Ubetcha!

While you're doing this labor intensive stuff you may consider adding an oil heater; screws into a bung, to enable use of vegetable oil/fuel oil blends [20-50%] and or use of dual filters. I added a second filter a few years ago and I could kick myself for not doing it sooner. The vegetable oil blends eliminates much of the sooting of the heat exchanger thereby a significant increase of efficiency.

Because I intend to use higher percentages of vegetable to #2 diesel I'm considering use of a Davcotech filter. Their heated filter with water separator feature is interesting. I've used their filters on diesel powered equipment with outstanding result.

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#8

Re: What to Do With Old #2 Fuel Oil?

10/21/2009 12:30 PM

How about adding a filter and a water collector between tank and boiler.....then try and burn the fuel as normal. Keep an eye on the water collector, empty regularly if required.....

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#10

Re: What to Do With Old #2 Fuel Oil?

10/24/2009 11:05 PM

Do you have a Hazardous Waste phone number you could ask them.

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