Posted by JIM on April 18, 2001 at 09:24:42:
In Reply to: Harold Kestenholtz-I got a question fer ya posted by Tarzan The Ape on March 31, 2001 at 17:18:06:
i HAVE KNOWN OF ONE CASE WHERE WATER WAS USED TO BLEND WITH bUNKER AT THE GUN TO REDUCE NOx AND A FAILED CHECK VALVE ALLOWED THE BUNKER TO MIX WITH MAKE UP WATER {JUST A THOUGHT}
jIM
: Harold, I've been following this forum for awhile and have learned to respect your answers, and now I got a question for you.
: So, with a tip of my greasy & soot stained hat, I'll end the formalities and get to it.
: I operate 3 20K LB/HR 100 PSI WT steam boilers and they all exhibit the same problem. The boiler water samples are BLACK. This black residue collects in the steam piping, LWCO's and level controls. After trying to fire one boiler on oil, I discovered that the atomizing steam piping and diff press regulator were all plugged with this black residue. I cleaned the piping and regulator valve of the debris and restored steam flow to the atomizers. In the meantime, the McDonnell & Miller PFC float type level controls all are hanging up because of this black residue. They require constant blowdown. None of the black stuff appears in the return condensate, but it is present in the steam and boiler water piping and components.
: What the heck is going on here?
: Water chemistry is as follows:
: Boiler water:
: P-Alk= 800
: N Condutivity= 2000
: Sulfides= 30/50
: Condensate:
: Hardness= 0
: PH= 9/9.8
: All operators are professional and can be relied upon to conduct blowdowns, chemistry testing and treatment as required....but we are all scratching our heads on this one.
: What is this black stuff and where is it coming from?
: My boss said he would commit un-natural acts if someone can explain this one....Personally, I would love to see him suck an egg thu a straw and spray it out his nose...So, help me please.
: Tarzan