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I've got an issue that maybe you can help me with. I've never resolved it. (I first noticed it a year ago.) When trying to flush my system with kerosene, my pressure drops to zero. Since these pumps are made for fuel oil, shouldn't they pump the lighter viscosity kerosene? Could the problem be the modification I (we) did to make it run at the lower speed? What else could it be? VO runs at 170 psi; K1 runs at 0 psi. What's up with that? Brian 2000 Jetta TDI 1982 Mercedes 300D Turbo 1986 Isuzu P'up (NA) 1985 Mercedes 300D Turbo 75/25 WVO/D2 for warm weather 50/50 WVO/D2 for cold weather Uniqueness is a treasure not to be buried. - Laurence Martel | |||
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Perk -- I think you had a similar situation when first testing your 2-stage suntec pump. Testing my single stage pumps I find a bit of a drop in pressure with thinner fluid, I suspect this is caused by the thinner fluid being able to more easily bypass the gears due to the pump having a good bit of wear that has increased the clearances on the sides of the gears and the gear chamber. The pressure never completely drops to "0" but it will drop below the 40 pounds it takes to keep the low pressure safty switch from tripping off. I don't think the mods would have any direct effect and cause the complete loss of pressure. One possibility, if you are still using the 2-stage pump. The picture attached at the bottom of this post shows the flow diagram of a model "B" 2-stage pump (disregard the two-step referance). It shows the fluid inlet for the lower set of gears as being at the bottom of the fuel cover fuel chamber, this oil is only used to lube the shaft seal and the gears create no pressure at all as the flow is returned directly back to the fuel chamber in cover of the pump. The upper set of gears is what actually is used to make the pressure and flow, The inlets for this set of gears are located a bit over half way up the columb of oil in the cover. I wonder if somehow the lower gear set is pulling enough oil out of the cover chamber to uncover the oil inlets to the top gear set, the top gears would then suck air and loose all pressure. The lower gear oil should be recirculating back to the cover chamber unless you are sending it back to the supply tank, if it is being recirculated into the cover chamber then the oil level in the chamber should stay high enough to feed the top gear set, don't know where elso to look. I don't yet have a 2-stage pump to look at or test, been intending to get one to try modifying it so I can use the 2 gear sets independently, one to make pressure for a burner nozzle, the other to use as the feed pump for the gear set that is feeding the burner nozzle, the second gear set will pull oil from the big fuel supply tank and keep the cover fuel chamber full for the other set of gears to pull from, the babington nozzle excess fuel return will run back into the cover chamber under gravity. ![]() | |||
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Actually, I am returning the return line back to the supply, so maybe if I change the orientation of the pump it will work with both fluids. Right now, it's vertical: the motor is shaft up and the pump is shaft down. Maybe I should re-mount it horizontally instead of vertically. I know the instructions say there is only one orientation that will not work, but an engineer at SunTec told me that any orientation will work. Maybe I found one that won't??? ![]() Brian 2000 Jetta TDI 1982 Mercedes 300D Turbo 1986 Isuzu P'up (NA) 1985 Mercedes 300D Turbo 75/25 WVO/D2 for warm weather 50/50 WVO/D2 for cold weather Uniqueness is a treasure not to be buried. - Laurence Martel | |||
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what are u using as a mister head at the exit into the dewatered holding container? Can you post some more pics of your flash evaporator, I see the tee where the elec. element is and the exit, but I do not see where the oil enters. | |||
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The oil entered into the side of the "T" on the bottom of the heater pipe. The oriface I am using is available from McMaster-car, the style I am using is basically a pipe plug that has been drilled with a tiny calibrated .o18 straight-drilled hole through the center of it, this gives a flow of 5 1/4 gallons/hour. A home furnace oil burner nozzle could also be used by removing it's easily removable internal spray insert, the insert makes the nozzle create a fog but by removing it you end up with a straight hole through the front portion of the nozzle, only problem is they use an odd thread for mounting so you have to either buy a furnace burner nozzle adapter or buy the correct threading tap to rethread a pipe fitting. I had a failure in my temp controller last fall and the heater was turned on continuously for about 12 hours, made a good bit of a mess by loading the entire unit with crusty oil, been too cold to rework the unit til now so I will be cleaning it up in the near future, adding a cheap $35.00 Ebay temp controller, and also moving up to a .o23 orifice, this should up the flow to closer to 10 G/H. The higher flow rate will likely keep the heater turned on 100% of the time for the first several hours til the entire barrel heats up, not a problem as I now only heat the oil through the evaporator to around 230-250 degrees to keep from causing the polimerization that happens when running it at 350 deg f. Yhe lower temp does not do a complete one-pass dewatering of really wet oil so I now let the eveporator run for the entire 3 days that I circulate the oil through the filters so no time is lost. Once I get the unit up and running again I will post some pics. I want to rework it a bit by mounting it slightly off to the side of the filter barrel rather than settin on the plywood top of the barrel, getting tired of moving it every time I want to open the barrel. Still intend to switch to a centrifuge eventually, It will cut my filter/dewater time from 3 days to only a few hours, and reduce the electricity cost of cleaning 50 gallons of oil down from around $8.50 to under a dollar. | |||
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what all do i need to make flash evaporator? I was told a power steering pump and an electric motor. piping and an electric water heater or two, and a thermostat. If i could get a few pics and some good advice i would much appreciate it | |||
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The only pictures I have of the verious parts are scattered throughout the early part of this discussion, they are poor pics as they were captured from video, unfortunatly I caught a computer virus that wiped out all the registeries on my computer hard drive and I lost even these poor pics. I still have not cleaned and repaired my unit after the temp controller failed so don't have even current pics. Now that the weather is getting better I will be disassembling the unit to clean it up and get it back in service, I now have a digital still camera so I will take pics again and post them here, probably should put a "Synopsis" page at the front of the discussion like Sunwizard did for his centrifuge thread. | |||
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thanks for replying, i just put tags on my mercedes 300 td. I am trying to set up a system to clean and dry my oil. I am using filter bags for now, they are 1 micron but i am not sure if they are absolute. On my rabbit i am using a parker racor 900 filter water seperator with electric heating element. what is your opinion on those, do those filters really block water? My rabbit has done fairly well except for a glow plug incident and fuel milage loss. I have been told injectors are probably malfunctioning. I appreciate all your help and look forward to seeing your new setup so i can build one. thanks again frydaddy | |||
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Tim --Wondering if there was any updates to your rig you could share Learn to make BioDiesel <a href="http://2ca7cf6cscrp1li7-dgwat2zc1.hop.clickbank.net/?tid=BIODIESEL1" target="_top">Click Here!</a> | |||
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i was wondering how you been doing are you still useing your FE i was thinking of building one so i was reading your post again my CF is not keeping up with oil drying its taking about 7 hrs to dry oil ! any updates ? avoid paying the man | |||
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I am just now getting around to cleaning oil again this summer, just stockpiled the oil over the winter. I had a failure of my temp controller last fall, this turned the heater full-on and I didn't catch it until the next day. This filled the heater pipe and the 1 gallon collection tank with crispies, it also burnt the paint off of everything. I will be rebuilding the setup sometime soon and intend to up the flow rate to 10 G/H by increasing the diameter of the orifice by 50%, I may also have to move up to the larger flow rate 1750 RPM rated Suntec oil burner pump to be able to supply the 150 pounds pressure at this higher flow rate, won't know for sure til I get it all back together and try it out. Rough calculations and past testing indicate that the existing 1125 watts of heat should be about right to keep this higher flow rate in the 250 deg f range if it runs full time but I will have to test this. I will post pictures of the rebuild. | |||
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Well here is just an Idea ,what about a solar water heater with a small hole at the top to alow steam to escape .The generate plenty of heat even in mild weather .Direct sunlight is all you would need .They are expensive but wont need replacing and it is free energy someting we all like | |||
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Just read back through this discussion and now see that I never actually brought my testing to a close. I was asked if I was still using the FE to dry oil in another short FE discussion dated April 2011, the following is a copy of the answer I gave there - I have stopped using the FE for a few reasons. To get totally dry oil in one pass I needed to run the temp up around the 350 deg f point but at this temperature you create a lot of polymerization on the inside surface of the heater pipe and the plumbing going to the orifice, bits of this plasticized material would break off and plug up the tiny orifice opening, I got tired of burning the begeses out of my fingers unscrewing and cleaning the hot pipe plug orifice. The polymerization goes away if you run the temp down around 250 deg f but you then have to recycle the oil through the unit several times to insure it is dry, either way it takes a good bit of electricity to do the extra heating, this was adding about $5.00 to the cost of each 50 gallon barrel of cleaned oil, the extra 10 cents/gallon is just something I would rather not have to pay. Somewhere on the biodiesel side of the forum I read of a setup being used for drying biodiesel by injecting a high speed stream of the biodiesel back into the top of the open topped dryer tank such that the stream was directed directly down into the top of the biodiesel, this high speed stream draws a LOT of air with it by venturie action as the stream impacts and drives through the surface of the bulk fluid, the air then spreads out under the surface of the oil and rises as bubbles that break on the surface and release the water vapor. This required passing the oil through more than once but so did the FE when run at the lower temp. I heat my settling and filtering barrels to 100 deg f and re-circulate the oil continuously through the filters for 48-72 hours anyway so by adding some plumbing I was able to do this same "venturie" thing with the oil out of the last filter, this has worked fine for the last couple years even in the more humid Illinois weather, it works GREAT in the less than 10% Arizona humidity. I do have to change filters a bit more often than before adding the venturie to keep the flow through the filters high enough to produce a high speed stream out of the 1/4 inch hose barb that I have screwed onto the end of the 1/2 inch pipe plumbing. The 1/4 inch hose barb restriction has an internal diameter of 3/16 inch and works to increase the stream velocity high enough to draw plenty of air down under the surface of the oil. With the heated oil I can actually see the water vapor rising out of the top of the open topped barrel for the first several hours, or up to a day, after that enough water has been removed that the vapor is no longer visible, I just let the setup circulate the warm oil unattended for the total cleaning/drying period of 2-3 days, this eliminates the added electricity cost, and the burnt fingers, and I still end up with nice clean dry oil. Thanks to everyone who participated in the development of small flash Evaporators and for all the info they added to this discussion - Thanks - Tim (I forgot all about doing more testing using low temp/high pressure, this may still be usable as a dewatering approach for a mobile dewatering setup.) | |||
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Hey Tim, Wondering if you could post a link to that discussion you found (i cant find it) about drying BIO/OIL with the new setup ? I am both a WVO user and also a BIO maker and would like a better way of drying both Craig | |||
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Don't have a clue now, the post had to be from well over two years ago now, there was a picture but it was from an off site web page, did you check the archives? Finding old discussions is a chore, been trying to find one of my own old posts for a couple weeks now, still nothing. | |||
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i find this peace of information very useful, i tried several dewatering techniques and this one is great. good work and more power men! | |||
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