How Much Is Black Ops 3 On Steam
Lahoma Helmy
Edwin Muller
KEMA Power Generation & Sustainables
Arnhem, The Netherlands
E-mail e.f.m...@kema.nl
Internet: -water.nl
RE: Black water in steam boiler TBP (Mechanical)19 Jan 04 08:23About the feedpump seal failures - are these the correct pumps for the application, and have they been piped properly? (A LOT of feedpumps have been improperly selected, and in a number of cases where properly selected pumps have been purchased, the suction piping has been botched. (Incorrect suction piping probably causes more pump problems than everything else put together.) I have seen cases where the operating feedpump suction pressure is just slightly below atmospheric, and air gets drawn in around the seal or packing. Not enough to cause any noticable operational problems, but enough that the oxygen in the air that is drawn in pits the discharge piping and boilers. DA 's were operating properly, and the sulphite levels were maintained in the storage section - yet pitting was still evident in the feedwater lines and boilers. Repiping the suction lines is a big, expensive job that requires a shutdown. Very unpopular. The band-aid fix is usually adding sulphite right to the drum. RE: Black water in steam boiler spector (Mechanical)(OP)19 Jan 04 09:38Hello TBP,
Pump seals..........That's one battle I managed to win. We recently changed to high temp seals and started making more precise alignments........We are also due to change to new flex couplings that are less sensitive to misalingment. I discovered pump seals were not 'hot water' rated. In service, the rubber boots hardened and the pump shafts became etched and pitted where the boot gripped the shaft. That prevented the seals from closing as it experienced wear.
I'll test boiler sample tonight with strong magnet......
Thanks for your informative replies! RE: Black water in steam boiler Wirt (Chemical)19 Jan 04 11:30Black, magnetic debris in boiler feedwater loop (e.g. feedwater, boiler water, steam condensate) could be due to too much reducing agent (i.e.oxygen scavenger) as well as low pH. If oxygen is in excess I would expect to see some red-orange debris. Howver, oxygen can not be ruled out as a part of the cause of the black debris. RE: Black water in steam boiler unclesyd (Materials)19 Jan 04 12:04With the level of sulfites and the wet lay up and your mention of carbuncles/tubercles there is possibility that SRBs' and/or Iron Reducing Bacteria are being introduced in the boiler while being laid up. Your conditions during lay up would be an ideal incubator. RE: Black water in steam boiler spector (Mechanical)(OP)19 Jan 04 13:23I experienced such a bacteria when serving on nuke submarines back in mid 80's.
Our trim water tanks supplied flushing water to our toilets....Sea water normally, but often topped off by fresh water via hose connection when pierside.
Almost overnight, our flushing water grew black and had rotten egg odor. When at sea, this became a nuisance in that it effected habitability. I owned the system, therefore I was stuck solving the problem. First attempts were to empty the tanks and refill. That proved a temporary fix as the water would soon become black and odorous again. I decided then to super clorinate the system which again proved only temporay. Other components in the trim system began to clog with an almost black thick slime-like growth.
The biggest problem it created was when our trim system prime float valves became clogged with it and we couldn't acheive good prime. This became a 'safety of ship' item......The trim system is essential to safe operation.
Samples of the goo and water from the tanks were sent out for test. I transferred off before I discovered the cause.
Only recently, while researching this problem with my boilers did I find mention of it. RE: Black water in steam boiler spector (Mechanical)(OP)19 Jan 04 13:36
Wirt.......That was my dad's name, Wirt Val, in fact.
Anyway, I did find large amount of red-orange sludge-like deposits in DA tank overflow trap. Haven't been allowed into storage tank yet. Boiler drums get frequent blows, so no evidence during internal inspection.
Interior of condensate/make-up mixing tank is coated with thick black plactic-like deposit that constantly flakes off to clog lift pump impellors. Tank is 47 years old, and walls thinned to point management fears failure if cleaned. I fear flakes that don't clog pump make it into DA tank and have accumulated in heater section preventing proper scrubbing of water. RE: Black water in steam boiler MHickman (Mechanical)19 Jan 04 14:45It is possible that the flakes could inhibit water flow inside of the DA; it could be creating a condition where spray valves in the DA have become damaged and or clogged. This can contribute to ineffective spray patterns or "firehosing" of the spray pattern onto the trays in the heater section. If the trays get damaged (due to sludge build up or firehosing), the water in the heater section may not have enough retention time for the last bit of scrubbing (which is the hardest to achieve). It looks like its making heat, but that will not tell you about the scrubbing performance until you read the O2 coming from the DA.
Have you done any O2 testing out of the DA tank? The presence of red oxide sludge in the overflow pipe is a bad sign, but may not be due to the DA performance. Manual O2 comparitor test kits are available (e.g. Chemetrics) and they only require a sample cooler. Hook up the sample line prior to the BFW pumps (preferably on a sample line directly in the DA storage tank) in the pump suction line. Chemistry feed and pump recircs can also affect O2 readings during a test so make sure that you isolate as necessary or as possible. DA's are usually designed to reduce dissolved O2 to 7ppb. If you are say, over 100 ppb, you probably could start by looking at the DA and continue from there.
If you do confirm poor performance of the DA, it would be a good idea to get permission to go inside the heater and storage sections on the next outage (if they allow you to have an outage). That way you can see if there are spray valve or tray problems.
Laying up and cycling are definitely not helping you either. RE: Black water in steam boiler spector (Mechanical)(OP)19 Jan 04 18:02
Yehaw!
Drew one gallon of very black boiler water into plastic sample bottle. Placed large magnet against side of bottle....in thirty minutes water was clear except for red-orange tint.... All black sediment was up against bottle next to magnet.
Iron.....or should I say high grade boiler steel tea?
I'll leave this just like it sits for the chemical man to see. Gee, wonder if his lab could use my magnet.
Thanks Gents RE: Black water in steam boiler spector (Mechanical)(OP)19 Jan 04 21:13kenvlach,
I drew large samples of boiler water(all boilers), and condensate.
Boiler PH 11.7. Condensate PH 9.0
Magnet revealed iron oxide in both samples, heaviest in boiler.
Opened steam strainer in atomizing steam line. Removed large clog of black material and broke it up with fingers and dissolved it in water, then tested with magnet....Iron....It separated out just like other water samples.
Concentration is so bad that sight glasses are pitch black, looks more like ink than boiler water.
Boss will not lose his job, this is a Veterans Hospital. Historically, all his experience till recently is HVAC, with very little hot water heating boiler and no steam plant experience at all.
Besides that, I like the guy.
Thanks to all of you. I have enough info now to proceed smartly. googletag.cmd.push(function() googletag.display('div-gpt-ad-1406030293255-2'); ); Red Flag This PostPlease let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
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The main difference between the two images is the sharpness of the steam and mug. The photo below is much more wide open [smaller f-stop], causing the steam to have a bit more of a hazy, out of focus appearance.
And now for a little backlit action. I have light coming in from behind the mug and to the left of the mug. I originally had a black board blocking the light to the left but much preferred the image with light coming from both angles.
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Shiny marks can appear on some fabrics, especially on dark coloured fabrics. We would advise ironing dark clothes inside out and using the correct temperature.
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Leave the iron to cool down before putting it away and follow these 4 tips:
Empty out the water remaining in the tank, set the thermostat to minimum, switch off the steam control and stand it upright or put it back in its base (depending on the model).