Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by dezirak

  1. dezirak

    500:1 Liquid Flow Control Turndown Needed

    Thank you all for the input. I think I have a few different options to investigate now.
  2. dezirak

    500:1 Liquid Flow Control Turndown Needed

    Hmmm... we really don't have the spacing for 3 valves on 9 tanks and that seems like a fairly complicated project with our outdated DCS. I can probably push two per tank through, but 3 per tank would have instrumentation hands ready to strangle me. I was going through some control forums and...
  3. dezirak

    500:1 Liquid Flow Control Turndown Needed

    Currently modifying catalyst control system. Current flow rates vary quite a bit by grade. .5lbs/hr to 150lbs/hr liquid (0.88 S.G.) is the most striking flow range seen. I am estimating a controllability turndown required of about 300:1 to 500:1. Current pump set up is a single stage...
  4. dezirak

    Automatic Bullet Dewatering Option Evaluation

    Currently we have a couple of very large hydrocarbon bullets (50/50 butane/propylene ambient temp) that occasionally accumulate water. Pump suction nozzle has a 24-36" standpipe going on one side of the vessel. Currently there is no form of water boot and no type of instrumentation that...
  5. dezirak

    What is the best Process Data Graphics Suite?

    Currently our chemical facility does not have a standard process data graphics suite. Our process data historian looks like it is going to need to be upgraded for windows 7 reasons (switching from XP on plant PC's). We currently don't have a standard process data graphics suite on sight...
  6. dezirak

    Rubber Slurry Pumping

    Thank you for your suggestion. I was originally considering a moyno pump to get around reliability issues, but a major issue is we need to reduce particle size due to other process needs downstream of the PD pump (separate but potentially connected project). Also, about 20-30 years back, a...
  7. dezirak

    Rubber Slurry Pumping

    Currently we are pumping a slurry of rubber particles in hydrocarbon using a lobe style PD pump. The consistancy can be thought of as chunky milk. Pump maintenance issues occasionally arise due to agglomerations of rubber particles larger than the lobe void space (sometimes quite a bit...
  8. dezirak

    Wierd Level Tuning

    KLIN 0.07500 NLFM 1 NLGAIN 10 KNL 3.348 (changes) K 0.11888 T1 75 T2 0 My question is, why would anyone use tuning like this for a hydrocarbon-water interface level controller? I am currently troubleshooting the reason that several level controllers in the water loop in a liquid-liquid...
  9. dezirak

    ISOM training

    nC5 to iC5 and nC6 to 2,2 and 2,3 dimethylbutane
  10. dezirak

    ISOM training

    I just started a job at a refinery and my boss told me to look for ISOM training and get signed up for it as soon as possible. UOP has a course, but unfortunately it is over with for this year. I was wondering if anyone here knows of any other company that offers ISOM training or training that...
  11. dezirak

    Galvanic Corrosion Question

    If I had a system that uses aluminum, steel, and copper as different construction components, all in the presense of boiling saltwater, how would I go about protecting each individual part of the system from galvanic corrosion? I've read about a sacrificial anode composed of magnesium in water...
  12. dezirak

    % solids or S.G. meter?

    I was wondering which would be more effective in controlling the amount of lime mud slurry to the lime mud fliter, an optical suspended solids meter or a Specific Gravity meter where a correlation is calculated to determine % solids? We use a S.G. meter an a correlation right now, I was...
  13. dezirak

    Weight of gas left in vessel, non choked conditions

    I know how to figure out the amount of gas left in a vessel during choked flow conditions through an orifice at a given time. http://www.air-dispersion.com/feature2.html explains this. I know how to figure out the instantaneous non-choked flow from a vessel through at a given pressure. I...
  14. dezirak

    constant enthalpy or entropy in PSV sizing?

    The gas is being throttled. The enthalpy is constant, but the internal energy is not necessarily constant. This may result in a temperature change through the valve. Look up information on the Joule-Thompson effect to better explain this.
See more

Part and Inventory Search

Back
Top