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 cowski 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 phex

  1. phex

    Column Scan to identify operational Problems

    Thanks all for the info provided. I suggested contacting Tracerco and talk with them about the possibility to do a scan like this. As soon as I have any news, I'll let you know if we've been successful. Regards, Chris
  2. phex

    Column Scan to identify operational Problems

    Dear all, I'm looking for a service company for a special column scan. A little background at first. We have a process to separate Aromatics from near-boiling Nonaromatics. This is an extractive distillation process using a selective solvent in order to change boiling points and thereby...
  3. phex

    RON calculations from component basis

    Although I am no blending engineer, and my experience in this area is limited, nut I found that blend calculated this was (linear ly by volume) often give results as much as one to two points below the real (meaning tested) value. One way to fix this is by using socalled "blending MON"s. data...
  4. phex

    MTBE production change to ETBE

    we have so far revamped 3 mtbe plants and have hab no problems at all. you will have to reduce the ethanol-c4 ratio in comparison to the old methanol-c4 ratio, and you should take a deep look into your alcohol-recovery column. there,you change from an easy to separate system (methanol-water) to...
  5. phex

    General Question: water-free sweetening

    Hello Forum, I'm looking for alternatives to amine washing for nat gas sweetening, especially molsieve processes or similar. I need a dry sweetewning process due to the setup of this project. The gas is produced on a field with only basic facilities, just for water and condensate removal, no...
  6. phex

    PRO- II beginners help

    the different thermodynamic property methods have their "special fields". Typically, if you work in a vapor or vapor/liquid system, you should choose an equation of state type, if you are basically only in liquid phase, try the activity models (in this case, i consider a column to be a liquid...
  7. phex

    PRO- II beginners help

    In proII you have to explicitly call for calculating the socalled "transport properties". If you select the thermo model, press the "modify"-button after having chosen. There, click on "transport properties" and tick the checkbos "calculate transport properties". choose whatever method you'd...
  8. phex

    Acceptable Hydrotest Pressure Drop

    We have commonly used .1 bar/h as maximum acceptable leakage rate. In sensitive systems (high pressure and toxic) we reduced this number to .01 bar/h. "we" in this case means my company. This is not regulated, as bvi says, so youshould talk to the customer, if there are any requirements by his...
  9. phex

    Control Valve Design

    Heh. the pressure drop across the valve is exactly the thing which allows you to control throughput. in the maximum throughput case you have minimum pressure drop and vice versa. imagine you have a pump located before the CV. if the CV is almost close, the pump will be working against a high...
  10. phex

    Reactor Pressure Relief

    i would go another way in both cases. size a rupture disk/PSV for the high pressure safety. For the runaway reaction case, install another mode of trip, for example strong temperature rise and do this with a FO purge valve to flare/slop. that way you have to completely independent systems and no...
  11. phex

    Does butane dissolve PVC?

    according to this chart, it has a good resistance (will not be effected by butane) http://www.omega.com/pdf/tubing/technical_section/chemical_chart_2.asp hth, chris
  12. phex

    what type of titanium is best for a wood stove/heater?

    Weight, I presume. As another example of the species "backpacker", I know of the hunt for grams to spare and titanium normally offers the best weight-to-durability ratio. Sadly, I cannot contribute to the initial question - I'm just a chemical engineer without much knowledge in the area of...
  13. phex

    Antisurge control for compressor - location of PT

    Thanks alot, hacksaw. Things are getting clearer. The system we have installed is not a real antisurge system as it should be and as such is probably not fast enough anyways. So the location of the PT doesn't make things significantly worse than they are anyways. The final decision will be met...
  14. phex

    Antisurge control for compressor - location of PT

    Heh. Are you in any way related to my boss? He gives quite the same elusive answers as that one ;) j/k Afaik, the objective of this antisurge controller is to take measures to prevent surging of the compressor as fast as possible, which means it should be able to react as fast as possible. The...
  15. phex

    Antisurge control for compressor - location of PT

    Thank you for the reply, hacksaw. If I understand your words correctly, the 5 meters of additional distance in our case really make a difference for the detection of an onsetting surge? If so, why? Thanks in advance, Chris
See more

Part and Inventory Search

Back
Top