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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I recently found my 12kv 60ma NST was dead, so i depotted it and i am currently soaking it in gasoline to dissolve the leftover tar so that i can further inspect the secondary and primary. I used about a gallon or two of gas (but that is only 3-4 dollars to fix a 100 dollar NST!), which will all be bad from the dissolved tar.
What should i do with this so called 'bad gas'? I could put it all in an old gas tank and use it in the future for more NST's (i have one more dead one, hehe oops did not know 20kv was more than 6kv :P) or cleaning stuff from gas engines (perhaps after filtering) but in the end, it will have to be gotten rid of somehow, and i want to do it properly.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
For details of the Household Hazardous Waste (HHW) Collection Program in Beaumont, Texas, contact Bob Dickinson at **link** or (409) 899-8444 Ext 7520. Collection is free at HHW events.
In Beumont Texas, "Household Hazardous Waste (HHW) is defined as home-generated materials that includes products such as paints, paint thinners, solvents, pesticides, insecticides, herbicides, fertilizers, automotive waste, cleaning agents, swimming pool chemicals, photographic materials, batteries, mercury containing items, and fluorescent bulbs."
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Thanks alot, Harry!
When i am sure i am done using the gas, i will take a bit and see if it has become less volatile, and perhaps slowly burn it and through any left over particles of tar out, as suggested by Dave Marshall.
Either that or what you suggested, Harry. It is indeed more 'green' but i would have to first convince my parents to give me a ride, and then convince then i wont get gasoline in the car :P.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
IF you can find a suitable container and storage space Then you should keep the Gasoline (petrol to us Brits) It has 1001 uses, mainly for cleaning - paint brushes & anything oily. Even when quite polluted it can be used as a first wash, with a little clean gasoline to finish.
You can also use it as a weed killer - without flames.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
You can greatly reduce the amount of solvent that is polluted, by mechanically removing most of the tar. (Maybe you already did that.)
Put the asphalt-potted NST, ballast, line filter, or whatever into household oven at 200F or so for an hour. Not hot enough for the black stuff to melt and flow, but make it soft like cheese. Then dig in with putty knife, screwdriver, metal spoon, etc.
I have read of, but not practiced, a complementary thermal method. Freeze the NST coil and core assy after removing the outer metal box. Then energize the windings in a way that dissipates plenty of power for a minute or two, enough to heat & soften the tar next to coil while the rest of the block remains brittle. Next step involves a hammer (and safety glasses!). As a preliminary step I would measure the DC resistances of the dead transformer.
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Proper disposal of 'used' gasoline.
