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  1. steamdog

    Atmospheric Flash Tank - Turbine

    We do two things: Vent Condenser: basically some coils in the vent piping with cold water in them. You heat up the water and the steam in the vent condenses. Or Water in the tank: We use a self contained cooling water valve and a spray nozzle. We spray right into the vent using a spray valve...
  2. steamdog

    Manual Valve Closing Times

    You should get from the gear operator and valve information the total number of turns required. I once did a job at a chemical plant where they put electric actuators on the large gear operated steam gate valves because they actually timed a guy trying to close the valve and it was over 3...
  3. steamdog

    Deaerator Tank Inquiry

    If you keep your vents open to the tank the pressure should not go below 0 when the water in the tank cools down.
  4. steamdog

    Trim 12 for steam service

    For steam application we always use trim 8, the 410 stainless is a bit harder than the 316 so you get less erosion.
  5. steamdog

    Flow meter in feed water pump by pass

    Not enough information to get you a proper answer. I guess you will have to be concerned with two phase flow after the ARC valve so you may have to install the flow meter before the valve, if you have room. You can always install one upstream of the pump, it may be easier.
  6. steamdog

    Steam Boiler Steam Line Velocity

    The outlet header on the boiler may have been sized so that the same boiler can be used on lower pressure steam, this way they can have one standard for all rated operating pressures. Other than cost, there is no real problem with an oversized flange on the boiler outlet.
  7. steamdog

    Proportional valve for water, low pressure

    You may need to use a small valve with pneumatic actuator, with a large solenoid on the air line that can open and close the valve VERY quickly
  8. steamdog

    REGULATOR FAIL OPEN CAPACITY PER ASTM F1795

    Full Disclosure: I work for the local Fisher Representative. The full open flow coefficient for a specific regulator (used so you can do the flow calculation - either choked or not) is not a calculated number but actually comes from empirical data from the flow lab at Fisher. So you will find...
  9. steamdog

    Deaerator level control

    The deaerator should be sized for your maximum load, so that the temperature in the storage part of the DA should not change with a higher flow rate and the shrinking of the water level should not be caused by colder water. You have not outlined your control method for the level so that it is...
  10. steamdog

    Control valve vs silencer

    The noise is created in the valve due to the pressure drop. By using a second control valve, each valve will take 1/2 the drop and the noise created will be less. Will it be low enough for your code/application? - I could not tell you. However, if you do put in that second valve it will...
  11. steamdog

    Booster pump on City water line

    You size the pump on the lowest water pressure available. You put a pressure control (or VFD) on the outlet of the pump so that it does not get over pressure. We use many booster pumps here in NYC for taller buildings, taking city water on the suction and discharge at a fixed pressure. If you...
  12. steamdog

    Steam Traps

    Modulating and Constant flow should be the same thing when considering steam traps. Certain types of traps will work as on/off (disc or often called thermodynamic traps), or modulating (float & thermostatic). Bucket type traps can work both on/off and modulating depending on the flow coming...
  13. steamdog

    Problems with Metal Seated Gate Valves on Steam Application

    We supply steam PRV equipment and although the gate valves are the least expensive alternative they are used extensively. We have had more success for critical applications using metal seated high performance butterfly valves and soft seated ball valves (with the correct seats for...
  14. steamdog

    Flash tank - how it works

    By the wording of your post it seems you do not have a deaerator but just an atmospheric boiler feed tank, so you are correct in that you cannot use the steam from the flash tank in the De-A. If you have use for low pressure steam local to the flash tank, then you can pipe the vent from the...
  15. steamdog

    Fisher Regulator Sizing

    Regulators are different than control valves when it comes to sizing. All regulators must have some 'droop' or offset flow, which is an offset to your setpoint. Most regulators are sized for a 10% droop, some for 20% and it depends on what your system can handle. The wide open Cv or Cg is used...
  16. steamdog

    Estimate Flow Rate to DA

    If you don't know ANY flow rates you can make some estimates: The boiler has a BTU or lb/hr value, this can tell you how much steam is being made which will be how much water the DA will put through.... EXCEPT you have to add blowdown, and in a perfect world the blowdown amount will equal the...
  17. steamdog

    Gore Universal Pipe gasket

    I have used Gore Series 300 on a high temperature hot water split case pump that was leaking. The stuff DID work like magic. Even the pump repair facility and the end user picked some up afterwards (it is expensive). Not sure about the 800, but the 300 is rated to 600 Deg F and 1000 psig...
  18. steamdog

    CURING ROOMS

    Some do it on temperature and others on pressure, depends on the type of curing room you have. the main problem consideration is humidity and temperature. When you let steam into a room it goes through a pressure drop, superheating slightly, actually dropping humidity and adding lot of BTU's...
  19. steamdog

    CURING ROOMS

    If you have any Lumber mills, lumber drying is a similar application and you may get some ideas there...
  20. steamdog

    Sanitary Stainless P/T Relief Valve

    Duwe6, I understand what you are saying and it makes sense when the water is above saturation temperature. This DI water is running around 160 def F. Should it get over about 190 Deg F it will ruin other parts of the system. Just like a temperature relief valve in commercial domestic hot...

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