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  1. Joesteam

    Pump Selection Questions

    Most pumps have a smaller outlet size than inlet, and both are usually smaller than the piping. As for speed, 1800 rpm seems to be a standard in most HVAC applications, however if you have high head and low flow, the 3600 rpm option will give a much more economical pump and also more efficient...
  2. Joesteam

    chw/hw pressurization pump

    There are commercially available systems just for this need. They are sized pretty small, not for the initial fill but to keep the pressure in the system in case of small outflows and pressure drops. Look at attachment of one we have used. Joe Lambert...
  3. Joesteam

    chw/hw pressurization pump

    If I understand the question, it sounds like the initial fill of the system, where the city water pressure may be too low to top it off due to the static head. I have seen some contractors use a little pump they temporarily hook up, first letting the city water fill until the max pressure is...
  4. Joesteam

    Butter fly valves vs. gate valves

    Butterfly valves will have tighter longer lasting shut-off for either a liquid or a gas. With soft seats you can get bubble tight shut-off, and even upwards of ANSI Class VI with metal seats. You can NOT get these types of shut-off's with gates. You can get a gear operator that gives them...
  5. Joesteam

    Glycerine in Boiler

    I'm working with a guy using a 30-40% glycerine solution directly in his fire tube hot water boiler. I have had to replace seals on the pumps due to grit in the system a number of times. I think the glycerine is burning on the tubes or there is some other type of reaction. There is also CPVC...
  6. Joesteam

    VFD on Ceiling Fan

    I have used a product for air intake in a boiler room that uses a VFD fan unit. May not be the least expensive option, but look at Exhausto http://www.exhausto.com/composite-11.htm
  7. Joesteam

    Combined Hydronic Piping

    You will need two separate loops, one for the domestic hot water and one for the heating. I have used a mixing valve on the heating loop to control the temperature of the heating water as the boiler water must always be the same hot temperature to create the domestic hot water.
  8. Joesteam

    selection of water heater

    This type of heater is more expensive than a standard one, however I have even sold one to a laudramat! We have them installed in public housing as well.
  9. Joesteam

    selection of water heater

    Because of the counter flow of condensing boiler it is the INLET water temperature that determines the efficiency. It can do practically any temperature gain as long as you are within the BTU and flow ratings of the boiler. So, for domestic HW applications, the condensing boilers get pretty...
  10. Joesteam

    selection of water heater

    For domestic hot water many new installations are moving away from large storage. The reason is two fold, the energy savings considering keeping large volumes of water hot during off hours, and the safety aspect of growths in the water such as Legoinella. Why not look into the new condensing...
  11. Joesteam

    Condensate Receiver Vent

    Keep the pipe 2" and slope back to the reciever. This way you will get just flash steam out of the vent (unless you have failed traps), and the liquid will drip back to the pump. Be sure the vent does not point to any area where the steam flow may harm people.
  12. Joesteam

    Air Intake for Boilers

    This is air for the boiler room, the boilers themselves have thier own fans.
  13. Joesteam

    Air Intake for Boilers

    There is a boiler room with three new forced draft oil burning boilers (2 ea. 300 HP and 1 ea. 100 HP). I was asked to provide the air intake fan. These boilers will be sequenced according to laod. Any experience with modulating vs. single speed fans and sizing of the air intake system will...
  14. Joesteam

    Thermal Actuated Valves

    Spence also manufacturers a valve for this application. Either pilot operated for large pipe diameters or direct acting for smaller ones. We use it on cold water to reduce the temperature of condensate before discharging into the sewer (reverse acting). Look At: www.spenceengineering.com
  15. Joesteam

    Plant Steam for humidification

    I am no expert on clean rooms, but you can 'clean' plant steam with a separator and filter (down to 1-micron). Much less expensive than a clean steam generator. Look at: http://www.spenceengineering.com/Handbook/scrub.pdf
  16. Joesteam

    Variable Flow Thru a Steam to Glycol Heat Exchanger

    Since you will be cutting down the flow in the heat exchanger, you will also be reducing the steam load. Therefor there is a chance that the steam control valve will be oversized and not be able to control the temperature well. If this is the case you may have to change to a 1/3 - 2/3 split...

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