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  1. BLogsdon

    Passive Hot Gas Reheat system

    YES! That's the term I was looking for. I feel a little silly having not known what that technology is called, since it's not a new concept. As for our units, yes, they are chilled water cooled. Since we require tight humidity control (application is a pharmaceutical cleanroom) there is a lot...
  2. BLogsdon

    Passive Hot Gas Reheat system

    That is not the system that is proposed, just an example. What is the common nomenclature for this type of system? I was hoping for some operators to weigh in and have opinions (i.e. headache/great/doesn't do much).
  3. BLogsdon

    Passive Hot Gas Reheat system

    We are installing additional cleanrooms in our aseptic pharmaceutical filling operation. The AHU that the engineering firm specified has what they are recommending a "passive hot gas reheat" system that utilizes a closed refrigerant loop with flow control to cool/dehumidify the mixed air and...
  4. BLogsdon

    Pressure Booster selection considerations

    I considered that but feel the risk is low since the N2 demand will be steady and well within the capacity for the N2 generator. In fact, this system is more regulated than is commonly done for these lab gas systems--typical lab units have a N2 membrane generator immediately downstream of a...
  5. BLogsdon

    Pressure Booster selection considerations

    Final design: House air supplied by oil-free compressors at about 90 PSI Boost pressure to about 175 PSI with a 2:1 pressure booster Store air in receiver and reduce to approximately 115 PSI Pass air through membrane-type N2 generator (outlet approx 110 PSI) Distribute in poly tubing to end...
  6. BLogsdon

    Pressure Booster selection considerations

    George, running the pressure to full compression of the booster, storing it in a receiver, and regulating it down to the desired N2 pressure is EXACTLY what the rep from Haskel suggested. Then I'll come off the regulator to a membrane N2 generator. I'm leaning toward the Haskel unit because of...
  7. BLogsdon

    Pressure Booster selection considerations

    I'm not worried about air quality. We're a pharmaceutical company and only have oil-free compressors, desiccant dryers, and (depending on the application) filter down to 0.02 um. The problem is our entire process and compressed air system has been validated at the 100 psi pressure so I am...
  8. BLogsdon

    Pressure Booster selection considerations

    The literature for these lab devices is pretty vague. The spec for the largest user requiring "A nitrogen generator with a minimum capacity of 5560 L per day with 100 psi at the side panel. Maximum consumption of nitrogen gas is 21 L/min." I'm assuming they are referring to volume at room...
  9. BLogsdon

    Pressure Booster selection considerations

    Our lab scientists are looking to replace the N2 bottles they use for their HPLC equipment with a N2 generator. Our manufacturing air pressure is maintained at 100 psi which is closer to 90 psi by the time it makes it to the lab. They need, at most, about 2 CFM at 110 psi of N2. I am debating...
  10. BLogsdon

    Black oxide in SS steam pipe

    I doubt iron in the water would do it. Our municipal water is surface water and does not have a particularly high iron content. The water is treated by a RO system and a evaporated by pure water still to <1.0 micro Siemens conductivity before it is evaporated again for the Clean Steam system.
  11. BLogsdon

    Black oxide in SS steam pipe

    Thank you for the replies. The conditions are saturated throughout the entire system, so that corroborates what Ed suggested about the conditions in which this would form. I'm under the "if it ain't broke, don't fix it" school, so I have no intention of suggesting a passivization of that system...
  12. BLogsdon

    Black oxide in SS steam pipe

    First post on the Forums... During an upgrade at our pharmaceutical plant, we cut open some Clean Steam piping to weld in a tee for future expansion. I assumed the internals would be polished stainless like the Water for Injection (WFI) systems. No, it has a matte black oxide layer that is not...

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