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8ob
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I cut the copper feed pipe and fitted some clear pipe and all seems well, brought the jet assembly forward in the pipe and its stopped flaming out.. I may tinker with the tube diameter, the fan is flat out and the pressure is up on the jet. Wondered if a smaller tuber would increase velocity.
Here is a Gaztube vid.
brightspark
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dunno why people call it a smelter 
your re melting metal in a furnace not smelting ore 
your re melting metal in a furnace not smelting ore 
MattF
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dunno why people call it a smelter
It's same as how people call vacuum cleaners hoovers. It's just become a generic term for general use.
Matchless
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I ran a waste oil warm air heater for around 10 years, 6 days a week, say 4-5 months a year, we started out filtering the oil but ended up just letting it sit for months in 20 litre drums and then being careful to leave the water and sludge in the bottom of the drum, the 50 litre holding tank had the takeoff about 1/4 of the way up the tank with a drain tap at the bottom, we never had blocked fuel lines, cleaned the heated tank to remove sludge maybe once a season, and the washable filter between the two tanks maybe every two months, the main issue we had was clag building up in front of the burner,
julianf
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Was that a kroll unit?
Matchless
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Yes it was, bought used on ebay, sold it at Beaulieu jumble four years ago after I found my new (well insulated) shed did not need much more than an oil filled radiator to keep the chill off.
julianf
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Ive been so tempted by them, but never found one on ebay at an even close to affordable price.
Can i ask what price you bought and sold for? Just out of interest!
@8ob exellent, pleased to see the flame from that wee burner, that flame would be about the ideal size for the foundry I've got in mind. I think with the kit I have it should be right. Might be a touch small for your big smelter plan though, by the look of it, that's probably what's limiting you, not enough air?
Cuthy246
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8ob
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I am pleased with the results considering it all worked out of the box with just a tad of tinkering, nozzle size I chose was 2.5mm but a 4mm is available to fit what I have. I need to run it for an hour to see how many KW its making as is, there is some information kicking about the web to do with GPH oil consumption and heat out put that could be useful but I cant find it. I will keep tinkering until I get it right.
Bob
Matchless
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Bought it so long ago I cannot remember, sold it just after I retired and again not sure, maybe a few £100's, wanted the oily thing gone, they are now sort of not allowed in commercial operation so there may be a few more about, I think you need a waste disposal licence to use one legaly, never bothered me as mine burnt as clean as a clean thing, I also had it plumbed into a red diesel tank with the waste oil tank behind, only used the red to start it up on very cold days, the trick was to run some red through last thing at night if it was going to be very cold next day, just saved a bit of faffing around first thing.
julianf
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I run our central heating here on biodiesel.
Kerosene settings are 8bar. Diesel is 12 bar. I have to run the bio on the limit of the pumps capabilities, at 15bar, to get stable ignition from stone cold.
I've considered milling a lump of alloy to strap around the high pressure line, just prior to the nozzle, with one of those little elements set into it, but I don't really want to go "custom" in a domestic environment, due to the possible implications.
A commercial drop in unit would be nice as then I could just offset the liability in worst case.
Note, if I had a reliable unit, I'd just burn waste vegetable oil, and not bother with the transesterification reaction at all. I'm not sure, but I suspect that is way way less controlled than burning wmo.
Your neighbours would hate you - the smell of used burger and chips wafting around....
julianf
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Used burgers?
I mean, im vegetarian, but im pretty sure used burgers dont smell that good!
Most things, wmo included, only seem to smell when you burn them too cold, or with insufficient air.
MattF
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Nope. Chuck some veg oil in a diesel engines tank, & you'll get that "chip shop" smell. Those engines aren't running cool.
julianf
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Relatively, they are.
Bob's job is to melt metal. I'm not sure if he has said what type of metal, but the coolest one anyone ever goes for is aluminium alloy.
....which is exactly what the heads of most diesel engines are made of.
Its common for diesel tuners to measure exhaust gas temps, and try and keep them under a sensible level, so as not to melt the head.
