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  1. dtse86

    CO2 Vaporizer Control Valve

    Montemayer, You are correct in the way you describe the system and how it was designed. The temperature of the distribution loop needs to be ambient given that all of the piping is uninsulated. My concern is with the control valve's ability to seal vapor if it was designed for liquid or vice...
  2. dtse86

    CO2 Vaporizer Control Valve

    Sorry that I did not specify. It is a bulk CO2 storage system for a research facility. It appears that the fill is liquid CO2 and it is actually stored under pressure (between 250psig and 265psig) where I believe it remains in a mixed saturated state. There are 2 vaporizers on the system. One...
  3. dtse86

    CO2 Vaporizer Control Valve

    Hi, I'm a mechanical engineer, but I figured that I'd post this in the Chemical Engineering forum given that a lot of you guys seem to know about CO2 liquid storage and their components. I was inspecting the installation of a new CO2 liquid storage tank and noticed that the drawings indicate...
  4. dtse86

    Using Recruiters to find a job.

    http://online.wsj.com/article/SB10001424052702304388304575574010358218880.html?mod=WSJ_hpp_sections_careerjournal A good article I stumbled on about recruiters.
  5. dtse86

    Pump Cavitation Indicator?

    Well, it turned out that the flotrex valve on the discharge of the pumps were only 20% open and so when the balancer started ramping up the pumps on the VFD we were getting cavitation at around 30 Hz, but that was only because we were pretty much dead heading the pumps. I ended up telling the...
  6. dtse86

    Pump Cavitation Indicator?

    Yea, we have come to that decision and the rep's coming out next week now. In my opinion, I think that everything is running just fine and that for some reason everyone thinks that 100hp pumps should be extremely quiet and that you should barely notice that they're on. I have a feeling that the...
  7. dtse86

    Pump Cavitation Indicator?

    tys90, After looking into it more, I believe that KLH is correct in that the discrepancy between our calculated and the 18' is in the atmospheric pressure. I think that the gauge on the suction side of the pump is only reading gauge pressure and not absolute, and so we have to add additional...
  8. dtse86

    Pump Cavitation Indicator?

    We are currently in the process of starting up an open system with large Armstrong Inline Pumps (~100hp). The pumps are currently controlled by the BAS through VFDs. The balancer has now come in and claims that he is hearing cavitation as he ramps up the pumps and that we are not meeting the...
  9. dtse86

    Fan Motor Upgrade

    We are currently looking to change out the motor of an existing fan with a larger one (75hp to 125hp). The weight difference in motors is approximately 550lbs and the motor mount size has changed from a NEMA326T to a NEMA444T. Initially we were told by the base manufacturer that we could simply...
  10. dtse86

    Thermo problem - obtaining internal energy value

    Your question is a little confusing. If the only process done on the system is the adiabatic compression, then the temperature of the system should be lower than temperature unless there was heating to the system as well to get it up to 400 degrees C. If there was heating, the vapor should have...
  11. dtse86

    Utility Pipe Trestle?

    Thanks guys. Now to tell my boss his idea won't work...
  12. dtse86

    Utility Pipe Trestle?

    Yea, I was wondering how they typically support something like that, with all that weight on there. And my boss wants to make it so that its easy to add more pipes after initial install if necessary. Because pipes get upsized and more pipes get added on this site quite often. It's pretty dynamic...
  13. dtse86

    Utility Pipe Trestle?

    The run is about 80' North and then 140' East. It'll be about 20'-30' in the air carrying 4 pipes from 6"-8" and some cable tray for building controls and possibly a few 1/4" high purity gas lines.
  14. dtse86

    Utility Pipe Trestle?

    My boss wants me to design a utility trestle that supports several large utility pipes in between buildings on site. I have no idea what typical design/build practices there are for this type of structure. He wants a modular design with 18' sections and catwalks on either side so that the...
  15. dtse86

    Air Balancing in Pharma

    I thought that when dealing with HPM distribution or reactions, the process needs to be performed in an exhausted enclosure which is typically either a vacuum or a heavily exhausted cabinet. The room which the tool or equipment sits in can remain positive pressure so that the operator has a...
  16. dtse86

    Can't find a job-unemployed for over 7 months

    In my opinion, you can never have too much education. Yes you already have a masters, but you can always go back to finish for a PhD. I had a professor in college that worked in industry for years and even had his company pay for his masters, but when he got laid off, he went back and finished...
  17. dtse86

    Air Balancing in Pharma

    I work in semiconductor cleanrooms and typically we try to control particulates using POSITIVE pressurization. Clean spaces are under positive pressure so that particles always flow to a less clean space. In the fab I am currently working in, we return our air into a dirty return air chase and...
  18. dtse86

    Career Advice

    Thanks for the advice desnov. That's exactly what I'm going to try to do. I just joined ASHRAE and plan on attending meetings. I have also been doing a lot of learning outside of work with a couple of HVAC textbooks I bought and have been reading them in my spare time. I didn't know that I could...
  19. dtse86

    Usefulness of Conferences

    I was wondering about the usefulness of industry conferences and learning seminars. Is it worthwhile to go even if your boss won't reimburse you for your expenses or pay for your time?
  20. dtse86

    Career Advice

    Well, that's my reason for worrying about my current position. I believe that is the reason for the requirements of each state board for someone to work under a P.E. for so long to obtain their license. It's so that it keeps the standard of engineering quality. But in my current position I'm...

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