On Thursday, January 12, 2012 03:23:23 PM andy pugh did opine: > On 12 January 2012 17:55, gene heskett <ghesk...@wdtv.com> wrote: > > That still needs the chemistry. Lets just say that disposing of about > > 3 gallons of well spent ferric chloride, diluted with at least 1000 > > gallons of water, was sufficient to put a new medium sized cities > > sewage plant that had just been brought online a week before, into > > shutdown as the bronze impellers and housings of the pumps were > > destroyed. > > Are you sure that wasn't coincidence? I would be astonished if there > were enough chloride ions left, and they spent enough time in the > pumps, to do that damage.
Bronze impellors and housings, bought specifically as the longest lasting versions. Replaced at the with about $50k of identical parts, some of which I understand I/R had to put the machining dept on a 2 shift basis to get it done in a timely basis. I can well imaging that with decent maintenance of the seals and bearings, say every 5 years or so, I could expect to walking into the place and find them still running today, 50+ years later. I have intimate knowledge of the 10-15-20 horsepower versions of that Ingersol-Rand pump, and can lay my hands on at least 3 of the 10HP models in about 10 minutes, none of them younger than about 1956 manufacture. They are commonly used as coolant pumps in water cooled transmitters. In that service, where the water is generally both 150F hot and subjected to a live, full time de-ionizer treatment, seals can last 15 years of 20/7/365 service, the last 6 or 7 years being 24/7 because it enhanced the dependability of the whole system to just feed it old John Wayne movies in the middle of the night. Seals generally fail gracefully, taking weeks for the first sign of dampness to turn into enough of a dribble to actually make a trail across the floor to the drain. By then, the motors humm has probably developed a slight roughness because I believe its the bearings that fail & that knocks out the seal. If I have all the tools handy, I can get some help to throw it up on the bench, and from there its maybe 1.5 hours to rebuild it unless I find a shaky bearing too. Good bearings, well mounted, make the seals last virtually forever. Not having the correct bearing pullers/drivers, I usually take the armature and end bells to a local motor shop. Sloppy end bells can wipe out a new bearing in 6 months so I make sure they check them well, or that I'm aware of it so I can seat them on some locktite. 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> Do your otters do the shimmy? Do they like to shake their tails? Do your wombats sleep in tophats? Is your garden full of snails? ------------------------------------------------------------------------------ RSA(R) Conference 2012 Mar 27 - Feb 2 Save $400 by Jan. 27 Register now! http://p.sf.net/sfu/rsa-sfdev2dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
