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  1. cub3bead

    Nitrogen vs steam blanket on top of hot water thermal storage tank

    These systems used to be made by Appalachian Controls. They have since been acquired by Fisher. The systems were normally designed to maintain the tank at +0.5" WC. Make sure you have a vacuum relief valve in the system if you are going to try and design you own system. If you don't include...
  2. cub3bead

    Blanketing of Boiler Feed Water Tank with Floating Balls?

    A couple of things need to be added to this discussion. The water entering the tank must be deoxygenated or the tank dosed with an oxygen scavenger. The floating balls only reduce the surface area exposed to the atmosphere which limits the rate of absorption of atmospheric oxygen. If the water...
  3. cub3bead

    Slurry eductor - design guide?

    In the case of the bottom ash the lids are wet an have usually been through a cusher so the solids ae generally granular in form and are handled well by eductors. In the case of a reactive material such as lime I suspect you will encounter many difficulties in the operation. If the 10% w/w...
  4. cub3bead

    codes and standards for steam and water analyzing system

    There are a number of applicable ASTM STandards on this subject. You should also look at ANSI/ASME PTC 19.11-1997 Steam and Water Sampling, Conditioning and Analysis in the Power Cycle. Also ASTM D1066-06 Standard Practice for Sampling Steam should be followed. Collecting representative...
  5. cub3bead

    Cooling Water Flow Shortage to Trim Coolers less than design rate??

    Did you check the coolers to see if all of the air was vented?
  6. cub3bead

    Water Treatment Plant

    The answer is it depends on the other ionic species, recovery and the cost of scale inhibitors at your site. Both CaCO3 and CaSO4 scaling are easily inhibited by the scale inhibitors currenty available. If you intend to operate at 85+% recovery then you had better look at an IX softener...
  7. cub3bead

    Seeking help on reverse osmosis

    Best not forget Orange County Water District's Water Factory 21. See http://www.ocwd.com/_html/wf21.htm
  8. cub3bead

    Seeking help on reverse osmosis

    Shootingstars78, MBR would produce a very quality effluent suitable for feeding a RO process. I would dose UV and O3 to kill off any biologicals that might slip through the MBR. Contact Siemens, GE Water, TriSep (SpiraSep membrane for MBR) and Koch Membranes (Puron membrane for MBR). All...
  9. cub3bead

    Solar Evaporation Ponds

    Sublimination is an amazing phenomenon. I have only seen it happen once. I spent one winter in the Canadian arctic and saw the snow slowly disappear while the ambient temperature stayed well below freezing.
  10. cub3bead

    Solar Evaporation Ponds

    zdas04, Great job in explaining that a task that appears simple is far from that. Pan evaporation rates are widely used to estimate evap pond sizes but you can run into some serious problems when the salinity in the pond gets high. Hydrate formation tends to hinder evaporation much like the...
  11. cub3bead

    Limestone Silo - Bag Filtration

    Check with your chemical supplier and get the flow rating off the blower's nameplate. The rule of thumb for sizing these things is 3-5 cfm/ft^2 of filter bag surface. ZMI/Portec standard bag house provides 295 ft^2 of bag surface and spec's a max air flow rate of 1175 cfm. This is a bitless...
  12. cub3bead

    On-Line Sodium Analyzers

    The biggest problem in measuring trace amounts of impurities in high presssure, superheated steam is getting a representative sample. I would refer you Jonas, Inc. for the EPRI Isokinetic Sampling Nozzles. Their web address is www.steamcycle.com The next part of the equation is balancing the...
  13. cub3bead

    How can I find salinity of some place?

    Measuring seawater Cl concentrations using a silver nitrate test is possible but the results would be questionable and the volume of Ag(NO3)3 required would be very large. There are better test methods now.
  14. cub3bead

    How can I find salinity of some place?

    Try looking at http://www.world-wide-water.com/PDFs/PDF%20frame.html This is a "typical" analysis. As I recall ME salinities run higher, close to 45,000 mg/l TDS.
  15. cub3bead

    Using steam as an inert gas blanket?

    Steam is commonly used to inert pulverizers in coal fired power plants.
  16. cub3bead

    Loacation of makeup for cooling tower

    If you do it make sure you install back flow preventers if the water source is from the potable supply system. Then test them regularly.
  17. cub3bead

    Time to paint a water tower

    Check with Carboline or Tnemec for their recommendations. NACE recommends a white metal blast for immersion service. I have also found that specifing a 2 mil anchor pattern gives you something for the prime coat to grip. Watch you temperature and humidity during the blasting. Flash rusting...
  18. cub3bead

    Water Tower interior

    It depends on the corrosivity of the water. If you have a slightly positive LSI then you may be ok. If it is negative then you will have problems. I would re-coat the interior with with a NSF 61 approved or state approved system. The water system clients might object to excessive rust if not...
  19. cub3bead

    Lined Irrigation Pond Slope Question

    Another alternative for an existing installation is to construct stairs on each bank so a person could climb out on their own. I assume a fox could eventually figure it's way out also.
  20. cub3bead

    Using treated effluent for Cooling Tower makeup

    With that much NH3 and PO4 (both nutrients)present there is a pretty good chance you will have a biofouling problem. The ammonia will also attack any Cu bearing materials. The high Fe will also cause deposition problems. Other than that the water looks like a reasonable water quality for CT...

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