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Posted by mm on October 29, 2009, 1:58 am
What am I likely to find inside the oil furnace flue collector and
heat transfer tubes, rust or the products of combustion?
When I took off the metal box that connects my furnace to the flue,
because holes had rusted in it, of course it was raggedy. Even on the
sides that had no holes, like the inside bottom, there was a thick
layer over all of it, maybe a 16th of an inch or more (3 mm?) and the
layer came off when I hit or scraped it, or hit the edge of it where
an adjoining piece had fallen off.
What do you think this stuff is, rust or the products of combustion
that were gradually deposited on this 30 year old furnace? (In
Baltimore where the heating season is 4 to 5 months.)
An argument for deposits seems to me to be that underneath it all, the
metal is flat and smooth, not smooth like formica, but "textured" with
no dips or bumps that are bigger than the others. And it has no
layers, even though the stuff that comes off is a separate layer. If
it were rust coming off in a layer, I would not expect the part that
is left to be the same layer, the same thickness everywhere.
Also the pieces that came off would crumble if I tried to bend them.
The guy who welded it said it was rust, but he was in his 20's.
So, what do you think was flaking off?
Tonight when I was cleaning the heat transfer chambers, they too had
stuff that flaked off, a few pieces as big as a quarter, many as big
as a penny. They too might have been rust or combustion products.
Here too, the inside of the chambers seemed flat and smooth.
So, what do you think was flaking off?
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Posted by Joe on October 29, 2009, 12:45 pm
> What am I likely to find inside the oil furnace flue collector and
> heat transfer tubes, rust or the products of combustion?
> When I took off the metal box that connects my furnace to the flue,
> because holes had rusted in it, of course it was raggedy. =A0Even on the
> sides that had no holes, like the inside bottom, there was a thick
> layer over all of it, maybe a 16th of an inch or more (3 mm?) and the
> layer came off when I hit or scraped it, or hit the edge of it where
> an adjoining piece had fallen off.
> What do you think this stuff is, rust or the products of combustion
> that were gradually deposited on this 30 year old furnace? (In
> Baltimore where the heating season is 4 to 5 months.)
> An argument for deposits seems to me to be that underneath it all, the
> metal is flat and smooth, not smooth like formica, but "textured" with
> no dips or bumps that are bigger than the others. =A0And it has no
> layers, even though the stuff that comes off is a separate layer. =A0If
> it were rust coming off in a layer, I would not expect the part that
> is left to be the same layer, the same thickness everywhere. =A0 =A0
> Also the pieces that came off would crumble if I tried to bend them.
> The guy who welded it said it was rust, but he was in his 20's.
> So, what do you think was flaking off?
> Tonight when I was cleaning the heat transfer chambers, they too had
> stuff that flaked off, a few pieces as big as a quarter, many as big
> as a penny. =A0 They too might have been rust or combustion products.
> Here too, the inside of the chambers seemed flat and smooth.
> So, what do you think was flaking off?
There is a detectable and allowable small ash content in commercial
fuel oil. What you are seeing is the accumulated deposits from 30
years of normal combustion. Nothing uncommon, and not really rust.
Joe
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Posted by mm on October 29, 2009, 4:25 pm
>> Tonight when I was cleaning the heat transfer chambers, they too had
>> stuff that flaked off, a few pieces as big as a quarter, many as big
>> as a penny. They too might have been rust or combustion products.
>> Here too, the inside of the chambers seemed flat and smooth.
>> So, what do you think was flaking off?
>There is a detectable and allowable small ash content in commercial
>fuel oil. What you are seeing is the accumulated deposits from 30
>years of normal combustion. Nothing uncommon, and not really rust.
Thanks. First I thought what you said, but the young guy confused me.
So the metal was pretty thin to begin with, even if the oil company
guy claimed I couldn't get one made and had to buy a new furnace.
(I will buy a new furnace before Dec. 2010 to take advantage of hte
tax credit and get a more efficient furnace, but I didnt' want to be
rushed. I'd rather spend 71 dollars and some of my time to have heat
now.)
>Joe
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Posted by HeyBub on October 29, 2009, 2:51 pm
mm wrote:
> What am I likely to find inside the oil furnace flue collector and
> heat transfer tubes, rust or the products of combustion?
> When I took off the metal box that connects my furnace to the flue,
> because holes had rusted in it, of course it was raggedy. Even on the
> sides that had no holes, like the inside bottom, there was a thick
> layer over all of it, maybe a 16th of an inch or more (3 mm?) and the
> layer came off when I hit or scraped it, or hit the edge of it where
> an adjoining piece had fallen off.
> What do you think this stuff is, rust or the products of combustion
> that were gradually deposited on this 30 year old furnace? (In
> Baltimore where the heating season is 4 to 5 months.)
> An argument for deposits seems to me to be that underneath it all, the
> metal is flat and smooth, not smooth like formica, but "textured" with
> no dips or bumps that are bigger than the others. And it has no
> layers, even though the stuff that comes off is a separate layer. If
> it were rust coming off in a layer, I would not expect the part that
> is left to be the same layer, the same thickness everywhere.
> Also the pieces that came off would crumble if I tried to bend them.
> The guy who welded it said it was rust, but he was in his 20's.
> So, what do you think was flaking off?
> Tonight when I was cleaning the heat transfer chambers, they too had
> stuff that flaked off, a few pieces as big as a quarter, many as big
> as a penny. They too might have been rust or combustion products.
> Here too, the inside of the chambers seemed flat and smooth.
> So, what do you think was flaking off?
Insulation protective coating to preserve the metal.
You're screwed.
Just kidding.
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Posted by mm on October 29, 2009, 4:58 pm
wrote:
>> Tonight when I was cleaning the heat transfer chambers, they too had
>> stuff that flaked off, a few pieces as big as a quarter, many as big
>> as a penny. They too might have been rust or combustion products.
>> Here too, the inside of the chambers seemed flat and smooth.
>> So, what do you think was flaking off?
>Insulation protective coating to preserve the metal.
>You're screwed.
>Just kidding.
ROTFLOL
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> heat transfer tubes, rust or the products of combustion?
> When I took off the metal box that connects my furnace to the flue,
> because holes had rusted in it, of course it was raggedy. =A0Even on the
> sides that had no holes, like the inside bottom, there was a thick
> layer over all of it, maybe a 16th of an inch or more (3 mm?) and the
> layer came off when I hit or scraped it, or hit the edge of it where
> an adjoining piece had fallen off.
> What do you think this stuff is, rust or the products of combustion
> that were gradually deposited on this 30 year old furnace? (In
> Baltimore where the heating season is 4 to 5 months.)
> An argument for deposits seems to me to be that underneath it all, the
> metal is flat and smooth, not smooth like formica, but "textured" with
> no dips or bumps that are bigger than the others. =A0And it has no
> layers, even though the stuff that comes off is a separate layer. =A0If
> it were rust coming off in a layer, I would not expect the part that
> is left to be the same layer, the same thickness everywhere. =A0 =A0
> Also the pieces that came off would crumble if I tried to bend them.
> The guy who welded it said it was rust, but he was in his 20's.
> So, what do you think was flaking off?
> Tonight when I was cleaning the heat transfer chambers, they too had
> stuff that flaked off, a few pieces as big as a quarter, many as big
> as a penny. =A0 They too might have been rust or combustion products.
> Here too, the inside of the chambers seemed flat and smooth.
> So, what do you think was flaking off?