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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

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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

In addition to the things said above (How I would love to be able to edit my posts), the bypass never accomodates the complete flow, always just a tiny fraction of the flow because in case of complete flow through bypass, the plant would shut down completely, including a total shutdown of the...

I have got a question concerning the location of a pressure transmitter in the discharge line of a turbo-(centrifugal)-compressor. This transmitter is connected to the antisurge control of this compressor. I'll have a try at ascii arts to visualize my problem: C----------------------...

Actually, PRO-II still exists and is sold under that name. ProVision is just the user interface, nothing more. One does not have to order this in addition, ProVision is provided only together with PRO-II, not as stand alone application (which would be useless as it doesn't include any...

My predecessors already gave the right answers. It is just a question of density and steam quality. The density is dependent on temperature and pressure of the steam and can be extracted from the steam tables or with any tool calculating by the IAPWS formula (as this one...

I sell them. Contact me. But please be careful. This is not an authority approved sale. Btw: metric horses have only nine legs, the tenth has a different function ;)