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Author Topic: cutting and welding on a diesel fuel tank-Now how to build a heat exchanger  (Read 4548 times)

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Offline OneWithWood

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Re: cutting and welding on a diesel fuel tank
« Reply #20 on: September 26, 2006, 07:38:54 AM »
Murf, you really stirred up my grey matter.   ???
The new plan is to install the tank in the small greenhouse next to the furnace ( I was really surprised when my sweet wife suggested this - floor space in the greenhouses is closely guarded  ;) )
I am thinking about the heat exchanger, I think to maximize the surface area and thus the heat transfer a coil in a tube would work out well.  I can easily plumb the return hot water line to run 180F water through the tube.  The problem is finding the correct fuel line to use.  B100 and copper do not get along very well so I need to use steel.  (The copper reacts with the bio diesel and degrades the fuel )
Does anyone know of a steel 3/8" OD line that is easily bent?  Or can I use heat to soften the steel to wrap it around a pipe without crimping it?  I want the coil to fit into a 4" maximum tube.  The water from the boiler has a conditioner in it that prevents the steel from rusting.

How do I modify the title of this thread to read: Cutting and Welding on a diesel fuel tank - Now how to build a heat exchanger  :)

and we haven't even gotten to food or guns yet  :D
One With Wood
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Offline scsmith42

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Re: cutting and welding on a diesel fuel tank
« Reply #21 on: September 26, 2006, 08:16:41 AM »
OWW - re steel lines that are easily bent, see if a local trucking parts supplier has bulk steel brake line.  Typically it comes in lengths up to 6' or so; I hope that  you don't need much!

Steel lines are also used on heavy equipment, and some speciality metal suppliers may stock small steel tubing that is a mild steel. 
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and a mix of log handling heavy equipment.

Offline Murf

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Re: cutting and welding on a diesel fuel tank
« Reply #22 on: September 26, 2006, 09:52:10 AM »
OWW, phone around your area to all the hydraulic shops and see if one of them has an old heat exchanger they have taken off a piece of heavy equipment or something.

Typically they are large tube style excchangers that go in line with the radiator hose. They are usually stainless or plated steel with a 3/8" or 1/2" steel line wound around on the inside terminating in pipe thread fittings on the outside at each end.

If you can find one of those all you have to then do is make up reducers to go from the oil line size up to, and back down from the heat exchangers size.

You may also get lucky and find a small hydraulic resrvoir with provisions for a heat exchanger coiul to be inserted. This may be less work and fiddling in the long run. Besides, doing it that way would give you a few gallons of hot oil always standing by for use.
If you're going to break a law..... make sure it's Murphy's Law.

Offline Don_Papenburg

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Re: cutting and welding on a diesel fuel tank-Now how to build a heat exchanger
« Reply #23 on: September 27, 2006, 11:36:52 PM »
Seamless hydraulic tube.  Farm and industial machinery scrapyards would be a good place to start.    Also use a couple runs of 1/4 or 1/8 " black iron pipe scedual 40 or less . I made a heat echanger for my blast hood that I stuck in the exhaust pipe on the compressor . It worked too good ,burned the rubber right off the hose.  anyway it was easy to bend and two smaller pipes would provide more exchange surface.
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