On Thursday 12 November 2020 12:00:20 Dave Cole wrote: > I have been using Pink RV antifreeze for years in my horizontal > bandsaw. The pump has been submersed in it for 7 years or so. I > never goes bad and stuff never seems to grow in it, but it does > evaporate slowly. I just add more. I use it full strength. The > Anticorrosives in it seem to keep rust at bay as well. Its a generic > 7x10 bandsaw. > I buy the stuff anyway to winterize my boat, so I always have some > around. Last time I bought it for just over $2/gallon. > > Distilled water is quite corrosive. I would avoid that by itself. > See the link below: > > https://www.corrosionpedia.com/definition/407/distilled-water#:~:text= >Despite%20its%20benefits%2C%20distilled%20water,carbon%20dioxide%20from >%20the%20air.
The high cost of distilled at the store, and the limited supply's on the shelf when you need to clean up a watercooled transmitter that may need 500 gallons a whack, long ago drove us broadcasters to de-ionized water. Commonly obtained from tap water for makeup, a Culligan de-ionizer can, when setup as a 10 gallon an hour bypass off the main 10 hp pump, usually an 80-100 gallon a minute Ingersol-Rand with an all bronze head. Can clean up what we captured off the roof of the transmitter building on a mountaintop in about 24 hours, and in 96 hours can give a probe it with a dvm reading that's higher than the 20 to 100 megs top reading of such a $30 meter. To give you folks an idea of the diff it makes, when I walked in the door at wdtv-5 in Oct of '84, they were scheduling an overnight downtime at 6 month intervals that often ran till hours after the signon time the next morning while we replaced a good share of the plumbing fittings that corrosion had nearly destroyed with the electrolysis from running 50 gallons a minute thru the finals, running at 7200 volts on the other end of the hoses, could do to the fittings inside the ends of the hookup hoses. I installed a Culligan de-ionizer on a bypass circuit. Took a couple $100 recharges of that a year because our makeup water was off the building roof. I replaced the leakage meter, a 100 ma model, with a 50 microamp version and instructed the operators to log the reading daily and call me when it got up to 10 microamps. On June 30th 2008 when I was long retired, and that then 65 yo GE analog transmitter site was turned off forever, the system had not been hardly touched except to refresh that cartridge. I had cut 2" off the hoses to inspect the barbs, and replaced the hoses once because they were so age hardened I could drive the barbs back into them. In about 17 years the last time I looked at them the brass hose barbs were discolored but otherwise undamaged by any further corrosion. Its all in how good a condition you keep the water in. And it costs a lot less overall to do it right. Distilled water isn't near as good as de-ionized can be, but I'll run it anyway since I can't buy even a throwaway cartridge that small. I wish I could. > However I buy gallons of distilled water from the market to dilute > full strength auto antifreeze. That stuff is poison to such a transmitter, those additives make it essentially a short circuit, so we used technical grade ethylene glycol, max 30% because it also makes the water carry less heat per gallon and more viscous and hard to pump at the 70+ GPM needed by each of a pair of $125,000 4KM100LA klystrons. Today we'ed use a 20hp pump and a vfd to maintain the flow, plus air flow louvers we thermostaticly closed to keep it from freezing in a -25F Nebraska winter. Yeah, you could say I've been there and done that. ;-) > Dave > > On 11/9/2020 10:58 PM, dave engvall wrote: > > IIRC RV grade antifreeze is propylene glycol and often flavored with > > a bit of methyl salicylate. Easy to tell if you have it all flushed > > out. You will be able to taste the oil of wintergreen long after the > > pink dye is gone. > > > > Dave > > > > On 11/7/20 6:46 PM, Gene Heskett wrote: > >> On Saturday 07 November 2020 19:15:46 Jon Elson wrote: > >>> On 11/07/2020 05:34 PM, Gene Heskett wrote: > >>>> Greetings all; > >>>> > >>>> I have just found that food grade antifreeze in the water seems > >>>> to be a nono for long term useage as motor coolant. > >>> > >>> Why do you need food grade in a recirculating system? How > >>> about plain old antifreeze, which has lubes and > >>> anti-corrosion additives. Or, they make a coolant for TIG > >>> torches that has the same stuff. > >>> I've had the same stuff in my TIG torch for over a decade, > >>> and it still runs fine. > >>> > >>> Jon > >> > >> I'll get some 50-50, about 5 gallons and change it. After only > >> minimal useage for a year, this stuff is really ugly pink snot. I > >> need to caulk around the line cord too as that is the only place > >> insects can get in an drown. The rv stuff must smell good to them. > >> > >> The amplifier came back. I'll send a check Monday. > >> > >> Thanks Jon. > >> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> Cheers, Gene Heskett > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. 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