tanks?

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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tanks?

Postby coats37 » Thu Nov 06, 2008 1:28 pm

sunwizard,

i am thinking about running veg through my main deisel tank and installing a secondary system for deisel. I remember you once saying that large tanks can be bad for the system. what is it about large tanks (25+ gal) that can cause problems?

If i decide to run veg through the secondary fuel system what type of tank should i look for. Or better yet what should i avoid?
96 dodge ram 2500 cummins 12v
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Postby SunWizard » Thu Nov 06, 2008 3:46 pm

Too big a tank can accelerate polymerization which can plug your filter and makes acids and water, see:
http://www.burnveg.com/forum/about40.html

For the same reason, avoid steel. Use aluminum, plastic or stainless. For some stock tanks its a trick installing a heated pickup. Using an add-on tank for diesel is not legally approved, although most ignore that.
Last edited by SunWizard on Fri Sep 24, 2010 11:26 am, edited 1 time in total.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
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Postby FerndaleFryer » Thu Nov 06, 2008 9:28 pm

not to hijack the thread but is is there a problem using sch 40 PVC? I assume it isnt because some of the system use PEX for the heater hose. I started thinking about it because I am trying to avoid steal, copper and brass.
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Postby SunWizard » Thu Nov 06, 2008 9:56 pm

PVC is OK but it can't handle hot temperatures very well so be careful how you do a heated pickup with it.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Postby FerndaleFryer » Thu Nov 06, 2008 10:43 pm

Ya it seems to be right on that cusp of temperature range, but on my truck It appears that my coolant temp cools off enough to be at the high end of acceptable temperature.

How is the heat transfer from pex to veg in the tank? I know its less than metals but not sure if it will be a issue.
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Postby SunWizard » Thu Nov 06, 2008 10:59 pm

pex is much worse heat transfer, I wouldn't use it as a heated pickup. Use aluminum tube.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Postby FerndaleFryer » Thu Nov 06, 2008 11:02 pm

would black pipe fall somewere between aluminum and pex? closer to aluminum I would hope.
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Postby SunWizard » Thu Nov 06, 2008 11:10 pm

Black iron has good heat transfer but it accelerates poly so I wouldn't want it in my tank, its about like steel.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Postby FerndaleFryer » Fri Nov 07, 2008 8:22 am

This is what you said in another post about your CF setup.

"I have 1 brass ball valve on my CF and have had no problems in > 2 years. It will grow a nice green slimy chicken skin on the outside of it after a long time of sitting with a little VO on it, while the black iron pipes next to it stay clean."

So I assumed that when compared to brass it is far supperior when it comes to polyermization. I guess I also assumed that the "black" coating did something to ofset the poly.
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Postby SunWizard » Fri Nov 07, 2008 10:09 am

Its better but not far superior. And in your tank is a far different place than on the outside of a pipe in my CF. See the poly thread I linked above.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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