On Thursday 17 April 2008, Erik Christiansen wrote: >On Thu, Apr 17, 2008 at 03:43:08AM -0400, Gene Heskett wrote: >> >I think the cyanide solution was for gold plating, and we used a >> >titanium anode, to avoid polluting the solution. (Which was consumed.) >> >> The solution or the electrode? For either, I always assumed that the >> anode should be whatever metal was being plated in order to replenish the >> solution. > >The solution. The titanium was chosen for inertness.
Platinum is even better. That is what is used in our transmitters plumbing, and helps to keep from carrying the hose barbs away from electralisys(sp?). Particularly on the water i/o at the tube socket, which has 7200 volts on it, and the other end of a 7 foot water hose is grounded. Obviously we use deionized water, but still, there is about 2 inches of about a 20 gage platinum wire mounted in a plug on the back side of the elbow fitting so that the wire is the first thing the water sees coming in, and again when it leaves as the last hot item it passes. They last about 10 years or more. We have a meter reading the leakage to ground on one of the hoses, about 6" from ground on a pipe section with another 6" of hose to isolate it. It was a 100ma meter originally, but that is very gross leakage when we can see a reading at all on it, so I put a 10 ma full scale meter in about 15 years ago, with instructions to the operators that the max allowable reading was 2 ma, and plan on changing the de-ionizer cartridge/tank when it exceeds 1 ma. If the water is in good shape, the meter reads maybe .2 ma. Getting picky has paid off, the only reason we had to do maintenance was to replace the galvanized iron hose barbs which would go away internally about annually. It gets real interesting when a hose blows off, and 300 gallons of water sprays all over the inside of the transmitter. Then I put brass barbs, and new platinum rods in about 15 years ago cuz there had to be something better. I got nervous about 5 years ago and we replaced the hose & barbs again, but the barbs we took out can go back in the next time, no damage once I took a real pissy attitude about water maintenance. But I have to watch culligan, who does the deionizer refill stuff for us. They don't always do a very good job of servicing them. I demand a .2 ma reading a week after the tank is replaced & if it don't do it, I take it back & get grouchy. Its a 'bypass' system, taking a piece of refrigerator icemaker hose off the top of the pump, with about 20 feet of it as flow restriction, dumps into the culligan tank, and a 10 foot hunk of cheap garden hose dumps it back into that big copper tank the pump pulls from. Pump flow is around 50 gpm. Interesting thing, the hose is 1" ID, and we had been using hose from a mining supplier for several cycles and then they changed the hose to an antistatic version without bothering to advise us. We put it in, turned on the high voltage and could smell burning rubber in about 30 seconds. Shut the high voltage off, opened the door and found our brand new hose had turned into a garden sprinkler! Now I go and get it myself & make sure there's no anti-static labels on it. >I like your >preference. Keep the solution in good nick, for next time. The raw metal >has to be cheaper than its salt. (Crikey, silver is still only $18/oz!) I can recall when it was $3 or $4/oz. But that was, shall we say, a few years back up the log. I even had light brown hair & needed the girls quite frequently then. And its not a 'stocked' item, most silver changes hands only on paper. And most of that is probably because some dickhead is playing with the market like the Hunts did 25 years ago. But they got greedy, and caught. Thanks Erik. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If swimming is so good for your figure, how come whales look the way they do? ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
