Hi, all. We are making the switch to DesignModeler. I have taken an on-line ANSYS course to help with this transition, but unfortunately there was not much time spent on constructing new geometries and I find myself challenged to do simple things. Instead of feeding these questions through...
Branan, Carl R, "Rules of Thumb for Chemical Engineers", p. 249, Gulf Publishing Company. There are calcs and a nomagraph which will tell you if your fluid velocity is too high. It's a reprint of an article from Adam Zanker for "Hydrocarbon Processing" (March 1976).
The process is at 1200 deg F and the concern about the PSV is that there are elastomer seats which are only good up to 750 deg F. I am looking for a metal-to-metal seated relief valve which can handle the higher temperature or I am proposing using what moltenmetal called an "impulse line" to...
I'm looking for high temperature PSV options for a pilot plant (i.e. small). Design conditions are 1200 deg. F and approximately 80 psig. The highest temperature PSVs I've found are only rated for about 750 degrees F. If anyone has any firsthand knowledge or any ideas about how to deal with...
After re-reading your message without bias I see that you are to have the reactants inside the spinning tube. If your flow is turbulent then you may not see any improvement. If it's laminar then perhaps you improve mixing at the wall, but enough to increase your reaction rate? Depends on the...
I think you're referring to a STT (spinning tube in tube) reactor which is commercially available and patented. The tube surface is finely polished and the clearances are small so that shear and turbulence is very high. If your reaction kinetics is mixing limited then this has shown to...
My non-HAZOP-expert experience is that PSVs or other relief devices are not considered in the HAZOP methodology. They would be listed as a HAZOP recommendation when it is determined there is a loss of mechanical integrity. Manual valves would be failed "open or left open, human error" or...
Thank you for the link, kenvlach. I saw a graph in there I had not seen before which will allow me to double-check some of my Aspen numbers.
Yes, we would likely use a diffuser or mixer of some sort.
Thanks again.
I've modeled heat of solution effects in Aspen Plus for diluting 50% caustic to 10% in an attempt to determine resultant temperatures at varying concentrations. This temperature is being compared against a piping specification to ensure the piping is adequate for this service. The resultant...
I agree with the recommendation for a small metering pump to avoid the falling static head (or implement some kind of level control if feasible to maintain static head).
The MEB approach to solve Q for the system described is an interative approach. The MEB can be simplified into the final...
Why can't you just use a simple Mechanical Energy Balance? Supply P, destination P, pipe diameter, pipe fittings, and elevation should be all you need to calculate flow. Isn't this a basic fluids problem?
Thanks, all, for the comments. I do not believe this pipeline will fall under DOT. I am also not anticipating needing to use smart pigs for thickness readings, etc., however I will ask my inspection group their input. My on-site "expert" mentioned spherical pigs but only in the context of our...
